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1,885,151 | MySQL vs Cassandra: Everything You Need to Know | When it comes to choosing a database for your project, two popular options often come to mind: MySQL... | 0 | 2024-06-12T05:05:31 | https://five.co/blog/mysql-vs-cassandra/ | mysql, cassandra, database, learning | <!-- wp:paragraph -->
<p>When it comes to choosing a database for your project, two popular options often come to mind: <a href="https://www.mysql.com/">MySQL</a> and <a href="https://cassandra.apache.org/_/index.html">Cassandra</a>. Both databases have significant traction in the developer community, but they cater to different use cases.</p>
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<p>MySQL has been a go-to choice for a long time when it comes to storing and managing data. It's a relational database, which means it's great at handling data that fits into tables and rows. MySQL is known for being ACID compliant, which is just a fancy way of saying it keeps your data consistent and reliable. If you need to run complex queries with joins and transactions, MySQL is great. That's why a lot of popular web applications, content management systems, and e-commerce platforms use MySQL.</p>
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<p>But what if you're dealing with a massive amount of data that needs to be spread across multiple systems? That's where Cassandra comes in. Cassandra is a NoSQL database, specifically a wide-column one. It's designed to handle large volumes of data and can easily scale horizontally. Cassandra is also great at ensuring high availability, so even if one part of your system goes down, your data is still accessible. That's why big organizations (Uber, Facebook, and Netflix) who deal with lots of data and real-time analytics use Cassandra in their tech stack.</p>
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<p>In this article, we'll further explore the key differences of MySQL vs Cassandra, looking into their data models, performance, and ideal use cases.</p>
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<h2 class="wp-block-heading">Should You Use MySQL When Building a Web Application?</h2>
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<p>If you're considering building a data-driven application and evaluating MySQL and Cassandra, it's worth exploring Five as a complementary tool, especially if you prefer using MySQL. Five is a rapid application development environment for creating data-driven software. <strong>Each application developed in Five comes with its own MySQL database and an auto-generated admin panel front-end.</strong></p>
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<p>One of the key advantages of using Five with MySQL is its visual database builder. Five allows you to create tables, fields, and relationships easily, saving you time and effort in setting up your database schema. Even if you have an existing MySQL database, Five can connect to it, enabling you to focus on building your application's front-end and business logic.</p>
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<figure class="wp-block-image aligncenter size-full"><img src="https://five.co/wp-content/uploads/2024/06/Five.Co-SQL-Dashboard-1-1024x576-1-1.png" alt="" class="wp-image-3067"/><figcaption class="wp-element-caption">An example application developed in Five with its own MySQL database</figcaption></figure>
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<p>Five provides a comprehensive set of tools for implementing business logic, such as events, processes, jobs, and notifications. You can write custom JavaScript or TypeScript functions to extend your application's functionality, giving you the flexibility to tackle even the most complex requirements.</p>
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<p>Deploying your MySQL-based application to the cloud is easy with Five. With just a single click, you can deploy your application to a scalable and secure cloud infrastructure. This allows you to focus on building your application rather than worrying about deployment complexities.</p>
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<p>To get started read this tutorial on <a href="https://five.co/blog/how-to-create-a-front-end-for-a-mysql-database/">How to Create a Front End for a MySQL Database in 4 Steps</a></p>
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<pre style="text-align: center; overflow: hidden; white-space: pre-line;"><span style="color: #f1ebda; background-color: #4588d8; font-size: calc(18px + 0.390625vw);"><strong>Build Your MySQL Web App In 4 Steps</strong><br /><span style="font-size: 14pt;">Start Developing For Free</span></span></pre>
<p style="text-align: center;"><a href="https://five.co/get-started" target="_blank" rel="noopener"><button style="background-color: #f8b92b; border: none; color: black; padding: 20px; text-align: center; text-decoration: none; display: inline-block; font-size: 18px; cursor: pointer; margin: 4px 2px; border-radius: 5px;"><strong>Get Instant Access</strong></button><br /></a></p>
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<h2 class="wp-block-heading"><strong>MySQL vs Cassandra: A Comparative Overvie</strong>w</h2>
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<h3 class="wp-block-heading"><strong>Structured Data Models: MySQL's Strength</strong></h3>
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<p>When it comes to storing and managing data, <a href="https://five.co/blog/what-is-mysql/">MySQL</a> and Cassandra have their own strengths. MySQL is a tried-and-true choice for dealing with structured data that fits into tables. It uses SQL, which is the go-to language for working with databases. MySQL is great if you need to run complex queries and ensure everything stays consistent. It's perfect for applications that require ACID (Atomicity, Consistency, Isolation, Durability) compliance, meaning your data will be reliable and accurate.</p>
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<h3 class="wp-block-heading"><strong>Flexible Data Models: Cassandra's Strength</strong></h3>
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<p>Cassandra, on the other hand, is more flexible when it comes to the types of data it can handle. It's great for dealing with unstructured or semi-structured data that doesn't always fit into a rigid schema. Cassandra is built to handle large amounts of data and spread it across multiple servers, making it easy to scale horizontally by adding more nodes to the cluster. So, if you're dealing with a lots of data and need to prioritize fast writes, Cassandra might be the way to go.</p>
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<h3 class="wp-block-heading"><strong>Replication and Fault Tolerance: MySQL vs Cassandra</strong></h3>
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<p>When it comes to keeping your data safe and available, MySQL and Cassandra have different approaches. MySQL uses a <a href="https://www.toptal.com/mysql/mysql-master-slave-replication-tutorial">master-slave replication</a> setup, where data is copied from a main node to one or more backup nodes. If something goes wrong, you'll need to manually switch over to a backup. Cassandra, on the other hand, has replication and automatic failover built right in. It copies data across multiple nodes in a cluster, so if one node goes down, the others can keep things running smoothly without any manual intervention.</p>
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<h3 class="wp-block-heading"><strong>Query Languages: SQL vs CQL</strong></h3>
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<p>Lastly, there's the matter of how you actually interact with your data. MySQL uses SQL, which is a standard language that's widely used and has a lot of features for querying, joining, and aggregating data. Cassandra uses its own language called CQL, which is similar to SQL but has some limitations. It trades off some of the advanced querying capabilities for simplicity and performance.</p>
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<h2 class="wp-block-heading"><strong>What Users and Developers Say About MySQL vs. Cassandra</strong></h2>
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<p>Here are some perspectives based on community feedback and real-world testing:</p>
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<h3 class="wp-block-heading"><strong>Performance Comparisons: Simple Operations</strong></h3>
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<p>One common observation is that Cassandra tends to be slower than MySQL <strong>for simple operations</strong>. For instance, a user reported the following performance metrics when executing basic write operations:</p>
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<li>Single insert: 0.0002 seconds</li>
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<li>1000 inserts: 0.1106 seconds</li>
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<li><strong>Cassandra:</strong>
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<li>Single insert: 0.005 seconds</li>
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<li>1000 inserts: 1.047 seconds</li>
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<p>These results show that for simple, single-node write operations, MySQL significantly outperforms Cassandra. This observation aligns with the general consensus that <strong>Cassandra's strengths lie in handling large-scale data and high-volume write operations across distributed systems, rather than excelling in single-node performance.</strong></p>
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<h3 class="wp-block-heading"><strong>Scaling and Distributed Systems</strong></h3>
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<p>Developers often highlight Cassandra's advantages in scenarios requiring high availability and horizontal scalability. While MySQL performs exceptionally well on a single node with structured data and complex queries, it faces challenges when scaling across multiple nodes. Cassandra, on the other hand, is designed to scale out easily by adding more nodes to the cluster, distributing data without compromising performance.</p>
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<h3 class="wp-block-heading"><strong>Detailed Developer Insights</strong></h3>
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<p>It’s important to recognize that performance testing with minimal data and a single node can be misleading. Cassandra's architecture is optimized for distributed, large-scale deployments. Simple, single-node benchmarks often do not reflect the system's capabilities in a real-world, multi-node setup where its distributed nature and high availability shine.</p>
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<h3 class="wp-block-heading">U<strong>se Cases for MySQL and Cassandra</strong></h3>
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<h4 class="wp-block-heading"><strong>MySQL Use Cases (<a href="https://five.co/get-started/">You can build any of these faster with Five</a>):</strong></h4>
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<li>Content Management Systems (CMS)</li>
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<li>E-commerce Applications</li>
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<li>Financial Applications</li>
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<li>Business Applications</li>
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<h4 class="wp-block-heading"><strong>Cassandra Use Cases:</strong></h4>
<!-- /wp:heading -->
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<ol><!-- wp:list-item -->
<li>Time-Series Data (e.g., Logs and Sensor Data)</li>
<!-- /wp:list-item -->
<!-- wp:list-item -->
<li>Real-Time Big Data Analytics</li>
<!-- /wp:list-item -->
<!-- wp:list-item -->
<li>IoT (Internet of Things) Applications</li>
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<!-- wp:list-item -->
<li>Applications Requiring Constant Availability and Low-Latency Access</li>
<!-- /wp:list-item --></ol>
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<hr class="wp-block-separator has-alpha-channel-opacity"/>
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<h2 class="wp-block-heading">FAQ's: <strong>MySQL vs Cassandra</strong></h2>
<!-- /wp:heading -->
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<div class="wp-block-essential-blocks-accordion root-eb-accordion-faxkv"><div class="eb-parent-wrapper eb-parent-eb-accordion-faxkv "><div class="eb-accordion-container eb-accordion-faxkv" data-accordion-type="accordion" data-tab-icon="fas fa-angle-right" data-expanded-icon="fas fa-angle-down" data-transition-duration="500"><div class="eb-accordion-inner"><!-- wp:essential-blocks/accordion-item {"blockId":"eb-accordion-item-mxep7","blockMeta":{"desktop":"","tab":"","mobile":""},"itemId":1,"title":"\u003cstrong\u003eIs Cassandra Still Being Used?\u003c/strong\u003e","inheritedTabIcon":"fas fa-angle-right","inheritedExpandedIcon":"fas fa-angle-down","parentBlockId":"eb-accordion-faxkv","commonStyles":{"desktop":".wp-admin .eb-parent-eb-accordion-item-mxep7 { display:block }.wp-admin .eb-parent-eb-accordion-item-mxep7 { filter:unset }.wp-admin .eb-parent-eb-accordion-item-mxep7::before { content:none }.eb-parent-eb-accordion-item-mxep7 { display:block }.root-eb-accordion-item-mxep7 { position:relative }","tab":".editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7 { display:block }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7 { filter:none }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7::before { content:none }.eb-parent-eb-accordion-item-mxep7 { display:block }","mobile":".editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7 { display:block }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7 { filter:none }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-mxep7::before { content:none }.eb-parent-eb-accordion-item-mxep7 { display:block }"}} -->
<div class="wp-block-essential-blocks-accordion-item eb-accordion-item-mxep7 eb-accordion-wrapper" data-clickable="false"><div class="eb-accordion-title-wrapper eb-accordion-title-wrapper-eb-accordion-faxkv" tabindex="0"><span class="eb-accordion-icon-wrapper eb-accordion-icon-wrapper-eb-accordion-faxkv"><span class="fas fa-angle-right eb-accordion-icon"></span></span><div class="eb-accordion-title-content-wrap title-content-eb-accordion-faxkv"><h3 class="eb-accordion-title"><strong>Is Cassandra Still Being Used?</strong></h3></div></div><div class="eb-accordion-content-wrapper eb-accordion-content-wrapper-eb-accordion-faxkv"><div class="eb-accordion-content"><!-- wp:paragraph -->
<p>Cassandra is still a go-to choice for a lot of companies, especially those dealing with big data and real-time applications. It's particularly popular in industries where high availability, scalability, and fault tolerance are essential.</p>
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<p></p>
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<p>Take Netflix, for example. They rely on Cassandra to handle data across multiple data centers. With the sheer volume of users streaming content around the clock, they need a database that can keep up. Cassandra's ability to distribute data efficiently across nodes and maintain high availability makes it fit for their needs.</p>
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<div class="wp-block-essential-blocks-accordion-item eb-accordion-item-ycxux eb-accordion-wrapper" data-clickable="false"><div class="eb-accordion-title-wrapper eb-accordion-title-wrapper-eb-accordion-faxkv" tabindex="0"><span class="eb-accordion-icon-wrapper eb-accordion-icon-wrapper-eb-accordion-faxkv"><span class="fas fa-angle-right eb-accordion-icon"></span></span><div class="eb-accordion-title-content-wrap title-content-eb-accordion-faxkv"><h3 class="eb-accordion-title"><strong>When To Use Cassandra Over SQL?</strong></h3></div></div><div class="eb-accordion-content-wrapper eb-accordion-content-wrapper-eb-accordion-faxkv"><div class="eb-accordion-content"><!-- wp:paragraph -->
<p>If you're building an application that needs to handle a lots of writes really quickly, keep latency low, and scale out easily, Cassandra might be a better choice than traditional SQL databases. Cassandra is designed to shine in distributed systems where you're dealing with huge amounts of data that doesn't necessarily fit neatly into a structured format.</p>
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<p></p>
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<p>One of the big advantages of Cassandra is its ability to maintain high availability and fault tolerance. If one of the nodes in your cluster goes down, Cassandra can keep going along without missing a beat. And when your data starts to grow, you can just add more nodes to the cluster to handle the increased load without sacrificing performance.</p>
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<p></p>
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<p>So, if you're working on an application that needs to be always-on, can handle a lot of writes, and might need to scale out quickly as your data grows, Cassandra is definitely worth considering.</p>
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<div class="wp-block-essential-blocks-accordion-item eb-accordion-item-cvo46 eb-accordion-wrapper" data-clickable="false"><div class="eb-accordion-title-wrapper eb-accordion-title-wrapper-eb-accordion-faxkv" tabindex="0"><span class="eb-accordion-icon-wrapper eb-accordion-icon-wrapper-eb-accordion-faxkv"><span class="fas fa-angle-right eb-accordion-icon"></span></span><div class="eb-accordion-title-content-wrap title-content-eb-accordion-faxkv"><h3 class="eb-accordion-title"><strong>Is MySQL Better Than NoSQL?</strong></h3></div></div><div class="eb-accordion-content-wrapper eb-accordion-content-wrapper-eb-accordion-faxkv"><div class="eb-accordion-content"><!-- wp:paragraph -->
<p>If you're dealing with structured data and need to run complex queries while ensuring strong consistency and ACID compliance, MySQL is probably the way to go. It's been around for a long time and is well-suited for these types of scenarios.</p>
<!-- /wp:paragraph -->
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<p>On the other hand, if you're working with huge amounts of unstructured data and your main priority is high write performance, scalability, and fault tolerance across multiple servers, then NoSQL databases like Cassandra might be a better fit. They're designed to handle these kinds of distributed environments and can scale horizontally pretty easily.</p>
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<!-- wp:essential-blocks/accordion-item {"blockId":"eb-accordion-item-whdt6","blockMeta":{"desktop":"","tab":"","mobile":""},"itemId":4,"title":"\u003cstrong\u003eWhen Should You Not Use Cassandra?\u003c/strong\u003e","inheritedTabIcon":"fas fa-angle-right","inheritedExpandedIcon":"fas fa-angle-down","parentBlockId":"eb-accordion-faxkv","commonStyles":{"desktop":".wp-admin .eb-parent-eb-accordion-item-whdt6 { display:block }.wp-admin .eb-parent-eb-accordion-item-whdt6 { filter:unset }.wp-admin .eb-parent-eb-accordion-item-whdt6::before { content:none }.eb-parent-eb-accordion-item-whdt6 { display:block }.root-eb-accordion-item-whdt6 { position:relative }","tab":".editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6 { display:block }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6 { filter:none }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6::before { content:none }.eb-parent-eb-accordion-item-whdt6 { display:block }","mobile":".editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6 { display:block }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6 { filter:none }.editor-styles-wrapper.wp-embed-responsive .eb-parent-eb-accordion-item-whdt6::before { content:none }.eb-parent-eb-accordion-item-whdt6 { display:block }"}} -->
<div class="wp-block-essential-blocks-accordion-item eb-accordion-item-whdt6 eb-accordion-wrapper" data-clickable="false"><div class="eb-accordion-title-wrapper eb-accordion-title-wrapper-eb-accordion-faxkv" tabindex="0"><span class="eb-accordion-icon-wrapper eb-accordion-icon-wrapper-eb-accordion-faxkv"><span class="fas fa-angle-right eb-accordion-icon"></span></span><div class="eb-accordion-title-content-wrap title-content-eb-accordion-faxkv"><h3 class="eb-accordion-title"><strong>When Should You Not Use Cassandra?</strong></h3></div></div><div class="eb-accordion-content-wrapper eb-accordion-content-wrapper-eb-accordion-faxkv"><div class="eb-accordion-content"><!-- wp:paragraph -->
<p>Cassandra may not be suitable for applications that require complex querying, strong consistency, or transactions adhering to ACID (Atomicity, Consistency, Isolation, Durability) properties. If your application relies heavily on complex joins, aggregations, and requires immediate consistency in all operations, a traditional SQL database like MySQL would be a better fit.</p>
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</div></div></div></div>
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<hr class="wp-block-separator has-alpha-channel-opacity"/>
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<h2 class="wp-block-heading"><strong>Quick Answer to MySQL vs Cassandra</strong></h2>
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<p>MySQL is a relational database management system best suited for applications requiring structured data, complex queries, and strong consistency with ACID compliance. It's ideal for applications with predefined schemas and transaction-intensive operations.</p>
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<p>Cassandra, on the other hand, is a NoSQL database designed for high write throughput, low latency, and seamless horizontal scalability. It's perfect for applications handling massive amounts of unstructured data, requiring high availability and fault tolerance across distributed systems.</p>
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<p>Choose MySQL for traditional, structured data applications and Cassandra for scalable, high-performance, distributed data environments.</p>
<!-- /wp:paragraph --> | domfive |
1,885,148 | Chain - a Goofy, Functional, Tree-backed List | What? Java has array-based Lists for efficient random access; there are LinkedList for... | 0 | 2024-06-12T05:04:14 | https://dev.to/fluentfuture/chain-a-goofy-functional-tree-backed-list-34dm | java, functional, tree, immutable | ## What?
Java has array-based `List`s for efficient random access; there are `LinkedList` for efficient appending. Who needs a tree for List?
Well, hear me out, just for the fun alright?
## Once upon a time
Agent Aragorn (Son of Arathorn), Jonny English and Smith collaborated on a bunch of missions.
The `Mission` class's signature is like:
```java
abstract class Mission {
abstract MissionId id();
abstract Range<LocalDate> timeWindow();
abstract ImmutableSet<Agent> agents();
}
```
The goal is to create an `ImmutableRangeMap<LocalDate, Set<Agent>>` (`RangeMap` is a Guava collection that maps disjoint ranges to values) to account for all the agents during each time window. Note that missions can have overlapping time windows, and agents could work on multiple missions at the same time.
So for missions like:
```
missions = [{
timeWindow: [10/01..10/30]
agents: [Aragorn, English]
}, {
timeWindow: [10/15..11/15]
agents: [Aragorn, Smith]
}]
```
I want the result to be:
```
[10/01..10/15): [Aragorn, English]
[10/15..10/30]: [Aragorn, English, Smith]
(10/30..11/15]: [Aragorn, Smith]
```
At first I thought to use the [toImmutableRangeMap()](https://guava.dev/releases/snapshot-jre/api/docs/com/google/common/collect/ImmutableRangeMap.html#toImmutableRangeMap(java.util.function.Function,java.util.function.Function)) collector, as in:
```java
missions.stream()
.collect(toImmutableRangeMap(Mission::timeWindow, Mission::agents));
```
Voila, done, right?
Not quite. My colleague pointed out that `toImmutableRangeMap()` does _not_ allow overlapping ranges. It wants all input time windows to be disjoint.
## `RangeMap` can `merge()`
The `TreeRangeMap` class has a [merge()](https://guava.dev/releases/snapshot-jre/api/docs/com/google/common/collect/TreeRangeMap.html#merge(com.google.common.collect.Range,V,java.util.function.BiFunction)) method that already does the heavylifting: finds overlappings and splits the ranges, and then merges the values mapped to the overlapping subrange.
With some effort, I created a [toImmutableRangeMap(merger)](https://google.github.io/mug/apidocs/com/google/mu/util/stream/GuavaCollectors.html#toImmutableRangeMap(java.util.function.BinaryOperator)) `BiCollector` on top of the `merge()` function.
So if what I needed is just to count the number of agents, I could have done:
```java
import static com.google.mu.util.stream.BiStream.biStream;
ImmutableRangeMap<LocalDate, Integer> agentCounts =
biStream(missions)
.mapKeys(Mission::timeWindow)
.mapValues(mission -> mission.agents().size())
.collect(toImmutableRangeMap(Integer::sum));
```
(It'll double count the duplicate agents though)
Anyhoo, here goes the interesting part: ***how do I merge the `Set<Agent>`?***
## Quadratic runtime
I could use Guava's `Sets.union()`:
```java
import com.google.common.collect.Sets;
ImmutableRangeMap<LocalDate, ImmutableSet<Agent>> agentsTimeline =
biStream(missions)
.mapKeys(Mission::timeWindow)
.mapValues(mission -> mission.agents())
.collect(toImmutableRangeMap((set1, set2) -> Sets.union(set1, set2).immutableCopy()));
```
The gotcha is that each time merging happens, merging two original sets into one is `O(n)` where n is the number of agents from the two overlapping ranges. If we are unlucky, we can get into the situation where a time window is repetitively discovered to overlap with another time window, and we keep copying and copying over again. The time complexity is quadratic.
## Stack overflow
Could I remove the `.immutableCopy()`? `Sets.union()` returns a view that takes constant time so we should be good?
Not really. We don't know how many times merging will happen, a `Set` can be unioned, then unioned again for unknown times. In the worst case, we'd create a union-of-union-of-union N levels deep. If N is a large number, we'll stack overflow when we try to access the final `SetView`!
The same will happen if for example I use `Iterables.concat()` or `Stream.concat()` ([javadoc](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Stream.html#concat(java.util.stream.Stream,java.util.stream.Stream)) discusses this problem).
And in case it wasn't obvious, the merging cannot modify either of the two lists or sets, because they are still associated with the sub-range that doesn't overlap. So we need it to be immutable.
If I had one of the [persistent collections](https://en.wikipedia.org/wiki/Persistent_data_structure) in the dependencies, I might just use it (they offer O(logn) performance for concatenation but usually are close to constant time). But I don't. And it doesn't feel like worth it to pull in one of such libraries for a single use case.
## Put it in a _tree_
I slept on this problem for about two days for an idea to come to me: can we use something like Haskell's `List`?
Tl;dr, Haskell's List is like `LinkedList` except it's immutable. So given a list of `[2, 3]`, you can `cons` the number 1 onto the list to get a new instance of `[1, 2, 3]`. Under the hood it's as simple as creating a new object with the internal `tail` pointer pointing to the old `[2, 3]` list.
If I can do this, each time merging happens, I only need to pay O(1) cost. The resulting object is probably less efficient for random access than `ArrayList` or Guava's `ImmutableList` because of all the pointers and indirections. But that's okay. When the whole split-merge process is done, I can perform a final copy into `ImmutableList`, which is O(n).
The only problem? Haskell's `cons` only allows to add one element, while I have two `List<Agent>`s to concatenate (I can't `cons` every element from one of the lists, because then I'm getting back to quadratic).
To support `concat(list1, list2)`, I decided to use a binary tree to represent the List's state:
```java
private static final class Tree<T> {
final T mid;
@Nullable final Tree<T> left; // null means empty
@Nullable final Tree<T> right; // null means empty
Tree(Tree<T> left, T value, Tree<T> right) {...}
}
```
In the list, the elements in `left` show up first, followed by `mid`, then followed by the elements in `right`. In other words, an in-order traversal will give us back the list.
The key trick is to figure out how to concatenate two binary trees into one. Intuitively, I need to find the new "mid point" value, which can be either the `left` tree's last element, or the `right` tree's first element. Say, if I take the `right` tree's first element, then the new tree's `left` remains the old `left`, while the new tree's `right` would need to be the old `right` after **removing the first element**.
## Wrap it up
Since the Tree is immutable, how do I *remove* any element at all? And in a binary tree, finding the first element takes up to O(n) time (it's not a balanced tree).
It turns out there's a [law](https://en.wikipedia.org/wiki/Indirection#:~:text=A%20famous%20aphorism%20of%20Butler,for%20%22level%20of%20indirection%22.) in computer science:
> All problems in computer science can be solved by another level of indirection
In human language: if a problem can't be solved with one layer of indirection, add two :)
Here goes my second layer of indirection that handles the _remove first element from an immutable list_ task:
```java
public final class Chain<T> {
private final T head;
@Nullable private final Tree<T> tail;
public static <T> Chain<T> of(T value) {
return new Chain<>(value, null);
}
public static <T> Chain<T> concat(Chain<T> left, Chain<T> right) {
T newHead = left.head;
Tree<T> newTail = new Tree<>(left.tail, right.head, right.tail);
return new Chain<T>(newHead, newTail);
}
}
```
This is quite like Haskell's `cons` list, except the `tail` is a binary tree instead of another `cons` list.
Now because both left and right `Chain` already have the first element readily accessible, I can just take the right `head` as the new mid point to build the new tree, with the tail from left and the tail from right. This new Tree maintains the order invariant as in `left.tail -> right.head -> right.tail`. And of course the left's head becomes the new `Chain` head.
It takes a bit of brain gymnastics. But if you sit down and think for a minute, it's actually pretty straight forward.
This solves the O(1) concatenation. And the good thing is that, no matter how deep `concat()` is nested, the result is always one layer of `Chain` with a heap-allocated `Tree` object.
Now we just need to make sure when we iterate through the `Chain`, we take no more than O(n) time, and constant stack space.
## Flattening tree back to `List`
My secret weapon is [Walker.inBinaryTree()](https://google.github.io/mug/apidocs/com/google/mu/util/graph/Walker.html#inBinaryTree(java.util.function.UnaryOperator,java.util.function.UnaryOperator)) (but you can create your own - it's standard tree traversal stuff). It already does everything I needed:
1. O(n) time _lazy_ in-order traversal.
2. Constant stack space.
Using it is pretty simple. First we add a `stream()` method to the `Tree` class:
```java
private static final class Tree<T> {
...
Stream<T> stream() {
return Walker.<Tree<T>>inBinaryTree(t -> t.left, t -> t.right)
.inOrderFrom(this)
.map(t -> t.mid);
}
}
```
The [`inOrderFrom()`](https://google.github.io/mug/apidocs/com/google/mu/util/graph/BinaryTreeWalker.html#inOrderFrom(java.lang.Iterable)) method returns a lazy stream, which will take at the worst case O(n) heap space and constant stack space.
Then we wrap and polish it up in our wrapper `Chain` class:
```java
public final class Chain<T> {
...
/**
* Returns a <em>lazy</em> stream of the elements in this list.
* The returned stream is lazy in that concatenated chains aren't consumed until the stream
* reaches their elements.
*/
public Stream<T> stream() {
return tail == null
? Stream.of(head)
: Stream.concat(Stream.of(head), tail.stream());
}
}
```
With that, it gives me O(n) time read access to the tree and I can easily `collect()` it into an `ImmutableList`.
In the [actual implementation](https://github.com/google/mug/blob/master/mug/src/main/java/com/google/mu/collect/Chain.java), I also made `Chain implements List` to make it nicer to use, and used lazy initialization to pay the cost only once. But that's just some extra API makeup. The meat is all here.
## In Conclusion
`Chain` is a simple _immutable_ `List` implementation that you can append, concatenate millions of times.
A bit of googling shows that people have run into [similar needs](https://www.google.com/search?q=java+merge+lists+in+constant+time&oq=java+merge&gs_lcrp=EgZjaHJvbWUqCAgAEEUYJxg7MggIABBFGCcYOzIMCAEQABhDGIAEGIoFMgwIAhAAGEMYgAQYigUyBwgDEAAYgAQyBggEEEUYPDIGCAUQRRg8MgYIBhBFGDwyBggHEEUYQNIBCDIxNjVqMGo3qAIAsAIA&sourceid=chrome&ie=UTF-8) but I didn't find a similar implementation that handles both the O(1) concatenation time and stack overflow concern. | fluentfuture |
1,885,150 | Buy Natural Gemstone Rings Rudraksha Online Bhagya G | Discover a world of natural beauty and spiritual wellness at Bhagya G. We specialize in offering a... | 0 | 2024-06-12T05:00:09 | https://dev.to/bhagyag1/buy-natural-gemstone-rings-rudraksha-online-bhagya-g-1467 | gemstone, rudraksha, buy, online | Discover a world of natural beauty and spiritual wellness at [Bhagya G](https://bhagyag.com/). We specialize in offering a wide range of high-quality natural gemstone rings and authentic Rudraksha beads, carefully selected to enhance your well-being and infuse you
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Custom Jewelry: Personalized jewelry designed to your specifications, incorporating your choice of gemstones and Rudraksha beads.
Healing Crystals: Additional healing crystals and stones to support your spiritual and physical well-being.
Key Features:
Quality Assurance: Rigorous checks to ensure the authenticity, quality, and superior craftsmanship of every product.
Detailed Descriptions: Comprehensive information on the benefits and properties of each gemstone and Rudraksha bead.
Customer Support: Dedicated customer service team ready to assist with any queries or concerns.
Secure Shopping: Safe and secure online shopping experience with encrypted payment gateway and privacy protection.
Fast Delivery: Prompt shipping services ensuring efficient and reliable delivery to your doorstep. | bhagyag1 |
1,885,007 | Using Secure Base Images | I wrote this article to share a bit of what I've learned in the PICK from LinuxTips. So, grab your... | 0 | 2024-06-12T01:25:32 | https://dev.to/batistagabriel/using-secure-base-images-5e6o | docker, containers | 
I wrote this article to share a bit of what I've learned in the [PICK](https://www.linuxtips.io/pick) from [LinuxTips](https://www.linuxtips.io/). So, grab your drink and join me.
It all started when, sometimes, security tools reported low/mid vulnerabilities, and when we went to assess what these vulnerabilities were, we always ended up in the mental agreement: "it's not something we did, so there's no way to fix it."
During the PICK classes, I got to know Chainguard. And then the idea came up to write this article to show how to use a secure base image to build the container for my application.
To demonstrate this, we will containerize a very basic console application of "hello world" in DotNet throughout this article, as the focus here is on how to build a Dockerfile for the application in a more secure way, not the application itself.
## Creating the application
Assuming you already have the DotNet SDK installed and configured in your environment, let's open our terminal and start creating the project.
We will create our application using the [console template of the DotNet CLI](https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-new-sdk-templates#console). We will do this using the following command:
```bash
dotnet new console -o HelloWorldApp
```
Once this is done, let's move to our favorite text editor to start manipulating the files contained in the project directory.
With your text editor open, let's modify the `Program.cs` file to have our Hello World. Edit your file to look like the following:
```csharp
namespace HelloWorldApp
{
static class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}
```
## Creating the Dockerfile
Perfect, now that you have created our application (which has the potential to hack NASA), it's time to create our Dockerfile to containerize our application.
_It is worth remembering that the Dockerfile needs to be at the same level as the csproj file, in our case, inside the `HelloWorldApp` directory._
To build our Dockerfile, in addition to using secure base images, we will use an organization and performance concept called [multi-stage builds](https://docs.docker.com/build/building/multi-stage/).
### First stage
Without further ado, let's move to the first line of our Dockerfile:
```bash
FROM cgr.dev/chainguard/dotnet-sdk:latest AS build
```
The base image we are using has a reduced scope so that there are only dependencies that satisfy the use of the DotNet SDK.
Therefore, compared to the scope of a base alpine image, for example, the chances of our container having vulnerabilities that do not pertain only to the DotNet SDK dependencies are much smaller. And this is the great advantage of using Chainguard's base images.
Still, regarding the first line, note that we used an alias to identify the stage that will be executed. In this case, we called the current stage `build`.
Moving on, so that we can execute our command that will compile our application and generate our dll (`dotnet publish`), we need to first declare that our files belong to a non-root user so they can be compiled. We will do this as follows:
```bash
COPY --chown=nonroot:nonroot . /source
```
Here we are using the `COPY` command to copy all the files from the current directory where the Dockerfile is located, under the permissions of a non-root user, to a directory inside the container called `source` which will be used later.
Since it is a secure base image, some operations (such as publish in our case) require a little more attention to permission levels, since letting things be compiled at a high level would undermine the security of the image.
At the end of this stage, we will define our default working directory and carry out the process of creating our dll, which will be directed to a directory called `Release`. This will be done in the following lines:
```bash
WORKDIR /source
RUN dotnet publish --use-current-runtime --self-contained false -o Release
```
### Final stage
Now, in this stage, we no longer need dependencies related to the SDK; we now need resources related to the DotNet runtime to run our dll. For this, we will use the following base image:
```bash
FROM cgr.dev/chainguard/dotnet-runtime:latest AS final
```
After this, we will proceed to define our default working directory and now use the great advantage of using multi-stage. As in the `build` stage, we have already generated our dll; we can now copy our dll to the current stage to use it. We will do this as follows:
```bash
WORKDIR /
COPY --from=build /source .
```
Note that in the `COPY` command we are stating that we want what was generated in the `/source` directory of the `build` stage to be copied to the root context `.`. And this is where we gain organization and performance in our Dockerfile, segmenting the creation and reuse of artifacts.
Finally, we will define our main command that will be executed when our container starts, that is, we will indicate that we use DotNet to run our dll. We do this as follows:
```bash
ENTRYPOINT ["dotnet", "Release/HelloWorldApp.dll"]
```
### Complete Dockerfile
With all this done, our final Dockerfile should look like the following:
```bash
FROM cgr.dev/chainguard/dotnet-sdk:latest AS build
COPY --chown=nonroot:nonroot . /source
WORKDIR /source
RUN dotnet publish --use-current-runtime --self-contained false -o Release
FROM cgr.dev/chainguard/dotnet-runtime:latest AS final
WORKDIR /
COPY --from=build /source .
ENTRYPOINT ["dotnet", "Release/HelloWorldApp.dll"]
```
## Building and Running the Image
With our Dockerfile created, it is time to build our image and see if everything works as expected (this is usually where everything catches fire). To do this, being in the same directory where our Dockerfile is, we will run the following command:
```bash
docker build -t helloworldapp .
```
Once the build is complete, let's move to the most awaited moment: running a container that will have our dll being executed. To do this, use the command:
```bash
docker run --rm helloworldapp
```
## That's All, Folks
This concludes our journey with the use of secure base images and multi-stage Dockerfiles. Clearly, you can venture further, for example, by creating GitHub workflows that scan the code or container with each push/pull request using tools like Snyk or Trivy.
Now it's up to you: abuse and use what we've covered here! Explore other base images, try to understand more how they work, try refactoring Dockerfiles to use multi-stage. Go beyond!
Remember: may the force be with you, live long and prosper, and don't panic! Allons-y! | batistagabriel |
1,868,151 | TIL: How to declutter sites with uBlock Origin filters | I originally posted this post on my blog a long time ago in a galaxy far, far away. I didn't know I... | 0 | 2024-06-12T05:00:00 | https://canro91.github.io/2023/11/13/DeclutteringUBlockOrigin/ | todayilearned, productivity, design, browser | _I originally posted this post on [my blog](https://canro91.github.io/2023/11/13/DeclutteringUBlockOrigin/) a long time ago in a galaxy far, far away._
I didn't know I could restyle elements on a page with uBlock Origin, a "free, open-source ad content blocker."
The other day, while reading HackerNews, I found [this submission](https://news.ycombinator.com/item?id=37584134) pointing to some uBlock Origin filters to clean up websites.
This is how to restyle a page with uBlock Origin and the filters I'm using to declutter HackerNews.
## 1. uBlock Origin filters to restyle elements
A uBlock Origin filter to restyle an element looks like this,
```
<domain>##<selector>:style(<new-css-here>)
```
For example, these are the filters I use to restyle HackerNews,
```
news.ycombinator.com###hnmain:style(background-color: #fdf6e3; width: 960px !important; margin: 0 auto !important;)
news.ycombinator.com##.rank:style(font-size: 14pt !important;)
news.ycombinator.com##.titleline:style(font-size: 16pt !important;)
news.ycombinator.com##.sitebit.comhead:style(font-size: 12pt !important;)
news.ycombinator.com##.subtext:style(font-size: 12pt !important;)
news.ycombinator.com##.spacer:style(height: 12px !important;)
news.ycombinator.com##.toptext:style(font-size: 12pt !important;)
news.ycombinator.com##.comment:style(font-size: 14pt !important;)
news.ycombinator.com##span.comhead:style(font-size: 12pt !important;)
news.ycombinator.com##.morelink:style(font-size: 14pt !important;)
```
## 2. How to install custom uBlock Origin filters in Brave
I use multiple browsers. Brave is one of them. It has good privacy defaults, like an ad blocker that uses the same filters as uBlock Origin.
To install these filters in Brave, let's navigate to `brave://settings/shields/filters`, paste the filters, and hit "Save."
If you're using uBlock Origin on another browser, click on the uBlock Origin extension icon, go to "Open the dashboard," and then to "My filters."
This is how HackerNews looked without my filters,
<figure>
<img src="https://canro91.github.io/assets/posts/2023-11-13-DeclutteringUBlockOrigin/Before.png" alt="HackerNew front page" width="800px">
<figcaption>HackerNews front page without any restyling</figcaption>
</figure>
And this is how it looks after restyling it,
<figure>
<img src="https://canro91.github.io/assets/posts/2023-11-13-DeclutteringUBlockOrigin/After.png" alt="HackerNew front page after restyling" width="800px">
<figcaption>HackerNews front page with some uBlock Origin filters</figcaption>
</figure>
I reduced the page width and the increased font size for more readability. I don't know about you, but I prefer the second one. I don't want to get eye strain getting closer to a screen to see a small font.
Voilà! That's how to use uBlock Origin filters to declutter websites. I like clean and minimalistic designs. Before learning about uBlock Origin filters, I started to dabble in browser extension development to restyle sites. With these filters, it's waaay easier.
What site would you like to declutter with this trick? What about decluttering dev.to? Share your filters in the comments.
***
_Hey, there! I'm Cesar, a software engineer and lifelong learner. Visit my [Gumroad page](https://imcsarag.gumroad.com) to download my ebooks and check my courses._
_Happy coding!_ | canro91 |
1,838,296 | From Keyframes to Keycaps: A Journey Through Animation Design | The world of animation brings characters and stories to life with movement and magic. But before the... | 27,353 | 2024-06-12T05:00:00 | https://dev.to/shieldstring/from-keyframes-to-keycaps-a-journey-through-animation-design-419c | design, animation, career | The world of animation brings characters and stories to life with movement and magic. But before the final product graces our screens, there's a meticulous process behind the scenes. This article takes you on a journey from the foundational concept – keyframes – to the final, interactive element – the keycap on a keyboard used to create those keyframes.
**Keyframes: The Blueprint of Movement**
Imagine animation as a flipbook. Keyframes are like the crucial images in that flipbook, capturing the most important points in a character's movement or a scene's transformation. Animators meticulously create these keyframes, establishing the starting and ending positions of an object or character.
**In-Betweening: Filling the Gaps**
Keyframes are like stepping stones – they provide the essential framework. But to achieve smooth animation, we need to fill the gaps in between. This is where "in-betweening" comes in. Artists create a series of drawings (or "tweens") that bridge the keyframes, creating the illusion of fluid motion.
**Software Steps Up: The Power of Animation Tools**
Modern animation software has revolutionized the process. Programs like Adobe Animate or Toon Boom Harmony offer powerful tools to streamline in-betweening. Animators can manipulate virtual "rigs" that control a character's movements, allowing for more efficient and precise animation.
**Beyond Traditional Animation: The Rise of 3D**
While traditional 2D animation remains a cornerstone, 3D animation has exploded in popularity. Software like Maya or Blender allows animators to create 3D models of characters and environments. These models can be rigged and animated, offering a new dimension of realism and movement possibilities.
**Keycaps: The Unsung Heroes**
Finally, let's not forget the unsung heroes of animation – the keycaps on the animator's keyboard! Every keystroke, from creating keyframes to manipulating software tools, contributes to the birth of animation.
**The Journey Continues: From Concept to Screen**
The animation process doesn't end here. Keyframes, in-betweening, and software tools are just a few steps in a larger pipeline. Once the animation is complete, it goes through coloring, compositing, and sound design before reaching the final stage – gracing our screens and captivating our imaginations.
**So, the next time you watch an animated movie or a video game cutscene, remember the journey from keyframes to keycaps. It's a testament to the dedication, creativity, and technological advancements that bring the magic of animation to life.** | shieldstring |
1,885,149 | Get Geeky with Python: Build a System Monitor with Flair | Introduction Hey there, fellow coders! Today, I'm super excited to share an awesome... | 0 | 2024-06-12T04:58:40 | https://dev.to/pranjol-dev/get-geeky-with-python-build-a-system-monitor-with-flair-gh2 | python, opensource, sysadmin, beginners | ### Introduction
Hey there, fellow coders! Today, I'm super excited to share an awesome project I recently worked on—a Python System Monitor. This isn't just any ordinary system monitor; it comes with a splash of color and a whole lot of flair! Whether you're a beginner looking to level up your Python skills or an experienced developer wanting to create a handy tool, this project has something for everyone. Plus, I've made it open-source, so feel free to check out the code on my [GitHub repository](https://github.com/Pranjol-Dev/python-system-monitor.git).
I'm new to the development world, and every star on the repo will really motivate me to keep learning and building cool projects!
### What Does It Do?
This Python System Monitor provides detailed information about your system's hardware, including:
- **System Information**: OS, Node Name, Release, Version, Machine, and Processor.
- **CPU Information**: Physical and Logical Cores, Frequency, and Usage.
- **Memory Information**: Total, Available, Used Memory, and Swap.
- **GPU Information**: Load, Free Memory, Used Memory, Total Memory, and Temperature.
### Key Libraries Used
- **os** and **platform**: For basic system information.
- **psutil**: To fetch CPU and memory details.
- **GPUtil**: To get GPU stats.
- **colorama**: To add some colorful flair to the terminal output.
- **tabulate**: To format the output into neat tables.
### Breaking Down the Code
Let's dive into the code and see how it all works.
#### 1. System Information
We start by fetching basic system details using the `platform` library. The `get_system_info` function gathers and formats these details into a table.
```python
import platform
from colorama import Fore, Style
def get_system_info():
uname = platform.uname()
system_info = [
[f"{Fore.YELLOW}System{Style.RESET_ALL}", uname.system],
[f"{Fore.YELLOW}Node Name{Style.RESET_ALL}", uname.node],
[f"{Fore.YELLOW}Release{Style.RESET_ALL}", uname.release],
[f"{Fore.YELLOW}Version{Style.RESET_ALL}", uname.version],
[f"{Fore.YELLOW}Machine{Style.RESET_ALL}", uname.machine],
[f"{Fore.YELLOW}Processor{Style.RESET_ALL}", uname.processor]
]
return system_info
```
#### 2. CPU Information
Next, we use `psutil` to get detailed CPU information, including core counts and frequencies.
```python
import psutil
from colorama import Fore, Style
def get_cpu_info():
cpufreq = psutil.cpu_freq()
cpu_info = [
[f"{Fore.CYAN}Physical cores{Style.RESET_ALL}", psutil.cpu_count(logical=False)],
[f"{Fore.CYAN}Total cores{Style.RESET_ALL}", psutil.cpu_count(logical=True)],
[f"{Fore.CYAN}Max Frequency{Style.RESET_ALL}", f"{cpufreq.max:.2f}Mhz"],
[f"{Fore.CYAN}Min Frequency{Style.RESET_ALL}", f"{cpufreq.min:.2f}Mhz"],
[f"{Fore.CYAN}Current Frequency{Style.RESET_ALL}", f"{cpufreq.current:.2f}Mhz"]
]
for i, percentage in enumerate(psutil.cpu_percent(percpu=True, interval=1)):
cpu_info.append([f"{Fore.CYAN}Core {i}{Style.RESET_ALL}", f"{percentage}%"])
cpu_info.append([f"{Fore.CYAN}Total CPU Usage{Style.RESET_ALL}", f"{psutil.cpu_percent()}%"])
return cpu_info
```
#### 3. Memory Information
Memory details, including swap memory, are fetched and formatted.
```python
from colorama import Fore, Style
def get_memory_info():
svmem = psutil.virtual_memory()
swap = psutil.swap_memory()
memory_info = [
[f"{Fore.GREEN}Total Memory{Style.RESET_ALL}", f"{get_size(svmem.total)}"],
[f"{Fore.GREEN}Available Memory{Style.RESET_ALL}", f"{get_size(svmem.available)}"],
[f"{Fore.GREEN}Used Memory{Style.RESET_ALL}", f"{get_size(svmem.used)}"],
[f"{Fore.GREEN}Percentage{Style.RESET_ALL}", f"{svmem.percent}%"],
[f"{Fore.GREEN}Total Swap{Style.RESET_ALL}", f"{get_size(swap.total)}"],
[f"{Fore.GREEN}Free Swap{Style.RESET_ALL}", f"{get_size(swap.free)}"],
[f"{Fore.GREEN}Used Swap{Style.RESET_ALL}", f"{get_size(swap.used)}"],
[f"{Fore.GREEN}Percentage Swap{Style.RESET_ALL}", f"{swap.percent}%"]
]
return memory_info
def get_size(bytes, suffix="B"):
factor = 1024
for unit in ["", "K", "M", "G", "T", "P"]:
if bytes < factor:
return f"{bytes:.2f}{unit}{suffix}"
bytes /= factor
```
#### 4. GPU Information
Using `GPUtil`, we gather GPU details and display them in a readable format.
```python
import GPUtil
from colorama import Fore, Style
def get_gpu_info():
gpus = GPUtil.getGPUs()
gpu_info = []
for gpu in gpus:
gpu_info.append([
f"{Fore.MAGENTA}GPU ID{Style.RESET_ALL}", gpu.id
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Name{Style.RESET_ALL}", gpu.name
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Load{Style.RESET_ALL}", f"{gpu.load * 100}%"
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Free Memory{Style.RESET_ALL}", f"{gpu.memoryFree}MB"
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Used Memory{Style.RESET_ALL}", f"{gpu.memoryUsed}MB"
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Total Memory{Style.RESET_ALL}", f"{gpu.memoryTotal}MB"
])
gpu_info.append([
f"{Fore.MAGENTA}GPU Temperature{Style.RESET_ALL}", f"{gpu.temperature} °C"
])
return gpu_info
```
#### 5. Displaying the Information
Finally, we use `tabulate` to display all the collected information in a clean, readable format.
```python
from tabulate import tabulate
from colorama import Fore, Style
def display_info():
system_info = get_system_info()
cpu_info = get_cpu_info()
memory_info = get_memory_info()
gpu_info = get_gpu_info()
print(f"{Fore.YELLOW}{'System Information':^50}{Style.RESET_ALL}")
print(tabulate(system_info, tablefmt="fancy_grid"))
print("\n")
print(f"{Fore.CYAN}{'CPU Information':^50}{Style.RESET_ALL}")
print(tabulate(cpu_info, tablefmt="fancy_grid"))
print("\n")
print(f"{Fore.GREEN}{'Memory Information':^50}{Style.RESET_ALL}")
print(tabulate(memory_info, tablefmt="fancy_grid"))
print("\n")
print(f"{Fore.MAGENTA}{'GPU Information':^50}{Style.RESET_ALL}")
print(tabulate(gpu_info, tablefmt="fancy_grid"))
print("\n")
if __name__ == "__main__":
display_info()
```
### Example Output
Here's what the output looks like when you run the script:
### Wrapping Up
And there you have it! A stylish and functional Python System Monitor that gives you a comprehensive look at your system's performance. Feel free to clone the repository, play around with the code, and customize it to your liking. You can find the full project on my [GitHub](https://github.com/Pranjol-Dev/python-system-monitor.git).
I'm new to the development world, and every star on the repo will really motivate me to keep learning and building cool projects. Happy coding! | pranjol-dev |
1,885,147 | Dog Boarding Melbourne | THE BEST FOR YOUR PET Dog Boarding Melbourne We know you don't want to leave them but when you need... | 0 | 2024-06-12T04:54:26 | https://dev.to/adogsdomain/dog-boarding-melbourne-5h8 | melbournedogboarding, dogboardinginmelbourne, dogboardingmelbourne | THE BEST FOR YOUR PET
[Dog Boarding Melbourne](https://www.adogsdomain.com.au/)
We know you don't want to leave them but when you need to, let us ease your mind that we will make sure your pet feels comfortable and relaxed. Whether its their first boarding experience, or they’re seasoned regulars, their wellbeing is central to everything we do.
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As pet owners, we all know the struggle of finding a reliable place to board our furry friends when we go out of town or are unable to care for them ourselves. It can be a nerve-wracking experience, leaving our beloved pets in the care of strangers while we are away. However, with the right boarding facility, we can rest assured that our pets are receiving the love, attention, and care they need.
A Dogs Domain and Cats too is a small family-owned-and-operated business that has been providing outstanding dog boarding and accommodation for several years. At [A Dogs Domain and Cats too](https://www.adogsdomain.com.au/), we know the importance of ensuring that your dog receives proper care and attention, which is why we have a team of dedicated professionals who work relentlessly to cater to all your dog's needs. From regular feeding and exercise routines to administering medication and providing comfortable sleeping quarters, we make sure that your dog is safe, happy, and comfortable during their stay with us. Your dog's well-being is our main priority, and we do everything in our capability to keep them happy and healthy during their stay with us. | adogsdomain |
1,885,146 | How to resolve Docker Compose Warning WARN[0000] Found orphan containers | Recently I got the docker compose error: Warning WARN[0000] Found orphan containers... | 0 | 2024-06-12T04:48:20 | https://dev.to/almatins/how-to-resolve-docker-compose-warning-warn0000-found-orphan-containers-4dfi | docker, dockercompose, linux, containers | Recently I got the docker compose error:
```Warning WARN[0000] Found orphan containers ([container-name]) for this project. If you removed or renamed this service in your compose file, you can run this command with the — remove-orphans flag to clean it up.```
when I was trying to deploy more than 1 Postgresql container within my local machine for testing purposes. It was not the Postgresql that had the issue, but rather my docker-compose.yaml file that has the issue. It seems that the issue was because I used the same directory name for both of the Postgresql projects.
**Before**
```yaml
services:
my-postgre:
container_name: my_postgre
image: postgres:alpine
restart: always
environment:
POSTGRES_DB: mydb
POSTGRES_USER: me
POSTGRES_PASSWORD_FILE: /run/secrets/postgres_password
volumes:
- pgdata:/var/lib/postgresql/data
- ./backup:/home/backup
secrets:
- postgres_password
ports:
- 5424:5432
networks:
- my_network
volumes:
pgdata:
networks:
my_network:
driver: bridge
secrets:
postgres_password:
file: ./postgres_password.txt
```
Based on the documentation [here](https://docs.docker.com/compose/reference/#use--p-to-specify-a-project-name). We can solve the above issue using several ways.
#1 Running `docker compose` command with `-p` parameter.
`sudo docker compose -p my-project-name up -d`
#2 Adding the project name in the `docker-compose.yaml` file.
I added the project name to distinguish between the two projects and now both of them running as expected.
**After**
```yaml
# adding the project name here
name: my-project-name
services:
my-postgre:
container_name: my_postgre
image: postgres:alpine
restart: always
environment:
POSTGRES_DB: mydb
POSTGRES_USER: me
POSTGRES_PASSWORD_FILE: /run/secrets/postgres_password
volumes:
- pgdata:/var/lib/postgresql/data
- ./backup:/home/backup
secrets:
- postgres_password
ports:
- 5424:5432
networks:
- my_network
volumes:
pgdata:
networks:
my_network:
driver: bridge
secrets:
postgres_password:
file: ./postgres_password.txt
```
I know this is not much but hopefully, you found this post useful somehow. Happy coding! | almatins |
1,885,145 | What is Branding? Understanding its Importance in 2024 | In today's fast-paced and highly competitive business landscape, branding plays a pivotal role in... | 0 | 2024-06-12T04:48:09 | https://dev.to/jkbranding/what-is-branding-understanding-its-importance-in-2024-42gc | In today's fast-paced and highly competitive business landscape, branding plays a pivotal role in shaping the perception of companies, products & services in the minds of consumers. Understanding the essence of branding and its significance is crucial for businesses aiming to thrive and succeed in 2024 and beyond.
**Define Branding**
Branding encompasses the strategic process of creating a unique identity, image, and message for a company, product, or service. It goes beyond mere logos and slogans; it embodies the core values, mission, and promises of a brand, fostering a deep emotional connection with its target audience.
**Relevance and Importance**
In the digital age of 2024, where consumers are inundated with choices and information, effective branding serves as a beacon, guiding consumers towards making informed purchasing decisions. A strong brand not only differentiates itself from competitors but also cultivates loyalty, trust, and advocacy among consumers, ultimately driving business growth and sustainability.
**Types and Categories of Branding**
**Corporate Branding**
Corporate branding focuses on establishing a cohesive identity and reputation for an entire company, encompassing all its products and services under one overarching brand umbrella. It aims to convey the company's values, culture, and vision to stakeholders, including customers, employees, and investors.
**Product Branding**
Product branding involves creating a distinct identity and image for individual products or product lines within a company's portfolio. It seeks to highlight the unique features, benefits, and value propositions of each product, resonating with specific target markets and consumer segments.
**[Personal Branding
](https://jkbrandingindia.com/)**Personal branding centers around individuals, such as entrepreneurs, executives, or professionals, who cultivate their own public image and reputation. It involves leveraging personal attributes, expertise, and experiences to build credibility, authority, and influence in their respective fields.
**[Service Branding
](https://jkbrandingindia.com/)**Service branding pertains to the marketing and promotion of intangible services, such as hospitality, healthcare, or consulting. It focuses on delivering exceptional customer experiences, building trust, and establishing long-term relationships with clients based on reliability, responsiveness, and quality of service.
**Symptoms and Signs of Effective Branding**
****Consistent Visual Identity**
A hallmark of effective branding is a consistent visual identity across various touchpoints, including logos, color schemes, typography, and imagery. Consistency breeds familiarity and reinforces brand recall, enabling consumers to easily recognize and associate with the brand.
**Strong Emotional Appeal**
Successful brands evoke emotions and sentiments that resonate with their target audience on a personal level. Whether it's joy, excitement, trust, or nostalgia, emotional branding forges deeper connections with consumers, fostering loyalty and advocacy beyond rational considerations.
**Clear Value Proposition**
Brands that articulate a clear and compelling value proposition stand out in a crowded marketplace. By clearly communicating the unique benefits and solutions they offer to consumers' needs and desires, brands can effectively differentiate themselves and attract their ideal customers.
**Engaged Community and Advocacy**
Building a passionate community of brand advocates and loyal customers is a testament to effective branding. Brands that actively engage with their audience, listen to their feedback, and involve them in brand experiences foster a sense of belonging and ownership, driving organic growth through word-of-mouth referrals and user-generated content.
**Causes and Risk Factors of Poor Branding**
**Inconsistent Brand Messaging**
Inconsistency in brand messaging across different channels and platforms can dilute brand identity and confuse consumers. Conflicting messages or values may undermine trust and credibility, leading to customer skepticism and disengagement.
**Lack of Differentiation**
Failure to differentiate oneself from competitors can result in a generic and forgettable brand that fails to capture consumers' attention or loyalty. Without a unique selling proposition or competitive advantage, brands risk being perceived as interchangeable commodities in the eyes of consumers.
**Negative Brand Experiences**
Poor customer experiences, whether due to product quality issues, service failures, or lackluster support, can tarnish a brand's reputation and erode consumer trust. Negative word-of-mouth and online reviews can spread rapidly, causing lasting damage to brand equity and market perception.
**Failure to Adapt to Market Trends**
In today's dynamic marketplace, brands that remain stagnant and resistant to change risk becoming obsolete or irrelevant. Failure to embrace emerging trends, technologies, or consumer preferences may result in missed opportunities and loss of competitive edge over more agile and innovative competitors.
**Diagnosis and Tests for Assessing Brand Health**
**Brand Audits**
Conducting comprehensive brand audits involves evaluating various aspects of brand performance, including brand positioning, messaging, visual identity, and customer perceptions. Through surveys, interviews, and market research, brands can gain valuable insights into their strengths, weaknesses, and opportunities for improvement.
**Competitive Analysis**
Analyzing competitors' branding strategies, market positioning, and customer feedback provides valuable benchmarking data for assessing one's own brand performance. Identifying gaps or areas of differentiation can inform strategic decisions and tactics to strengthen the brand's competitive advantage.
**Brand Tracking Metrics**
Monitoring key performance indicators (KPIs) related to brand awareness, preference, loyalty, and advocacy enables brands to track their progress over time and gauge the effectiveness of their branding efforts. Metrics such as brand equity, Net Promoter Score (NPS), and social media sentiment analysis offer quantitative insights into brand health and consumer sentiment.
**Customer Feedback and Surveys**
Soliciting feedback from customers through surveys, reviews, and social media engagement provides qualitative insights into their perceptions, preferences, and experiences with the brand. Actively listening to customer feedback and addressing their concerns demonstrates a commitment to continuous improvement and customer-centricity.
**Treatment Options for Enhancing Brand Performance**
**Brand Positioning and Messaging**
Clarifying the brand's positioning, values, and messaging to align with target audience preferences and market dynamics is essential for building brand relevance and resonance. Crafting a compelling brand narrative that authentically communicates the brand's story and value proposition helps differentiate it from competitors and resonate with consumers on an emotional level.
**Visual Identity and Design**
Refreshing or refining the brand's visual identity, including logos, color palettes, typography, and imagery, can breathe new life into its aesthetic appeal and brand perception. Consistent branding across digital and physical touchpoints reinforces brand recognition and fosters a cohesive brand experience for consumers.
**Customer Experience Enhancement**
Investing in delivering exceptional customer experiences at every touchpoint, from pre-purchase interactions to post-purchase support, is critical for fostering loyalty and advocacy. Personalization, convenience, and responsiveness are key drivers of positive brand experiences that leave a lasting impression on consumers.
**Content Marketing and Storytelling**
Harnessing the power of content marketing and storytelling allows brands to connect with consumers on a deeper level by delivering valuable, relevant, and engaging content that educates, entertains, or inspires them. Authentic storytelling that resonates with the brand's values and resonates with consumers' aspirations builds trust and affinity over time.
**Preventive Measures for Sustaining Brand Health**
**Brand Governance and Guidelines**
Establishing clear brand governance structures and guidelines ensures consistency and coherence in brand execution across different channels and stakeholders. Documenting brand standards, voice, and visual identity elements helps maintain brand integrity and guard against dilution or misrepresentation.
**Continuous Monitoring and Feedback Loop**
Implementing systems for ongoing monitoring and feedback collection enables brands to stay attuned to evolving market dynamics, consumer preferences, and competitive threats. Regularly soliciting feedback from customers, employees, and partners facilitates agile decision-making and proactive adjustments to brand strategy and tactics.
**Investment in Brand Building**
Recognizing branding as a long-term strategic investment rather than a short-term expense is essential for building and sustaining brand equity and competitive advantage. Allocating resources towards brand building initiatives, such as advertising, sponsorships, and community engagement, reinforces brand visibility, credibility, and relevance in the marketplace.
**Crisis Preparedness and Reputation Management**
Proactively preparing for potential crises and developing robust crisis management protocols minimizes the impact of negative events on brand reputation and consumer trust. Swift and transparent communication, coupled with proactive steps to address issues and mitigate risks, can help brands navigate challenging situations with minimal damage to brand equity.
**Personal Stories or Case Studies**
Brand Success Story: Apple Inc.
Apple Inc. exemplifies the power of branding in transforming a company into a global icon and cultural phenomenon. From its innovative products and sleek design aesthetics to its iconic marketing campaigns and retail experiences, Apple has cultivated a loyal following of "Apple enthusiasts" who eagerly await each new product launch and iteration.
**Brand Failure Case Study: New Coke**
The launch of New Coke in 1985 serves as a cautionary tale of branding missteps and consumer backlash. Despite extensive market research and testing, Coca-Cola's decision to reformulate its flagship product resulted in a public outcry and plummeting sales, forcing the company to revert to its original formula as Coca-Cola Classic.
**Expert Insights on Branding**
**Dr. Maya Angelou, Renowned Author, and Poet**
"Branding is not just about products or services; it's about emotions and experiences. A brand is a story that unfolds in the hearts and minds of consumers, shaping their perceptions, choices, and allegiances."
**Simon Sinek, Author, and Motivational Speaker**
"People don't buy what you do; they buy why you do it. Successful brands inspire loyalty and advocacy by communicating their 'why'—their purpose, beliefs, and values—that resonates with consumers on a deeper, emotional level."
**Conclusion**
In conclusion, branding is not merely a superficial exercise in aesthetics or marketing; it is the soul of a company, encapsulating its essence, identity, and aspirations. In an increasingly interconnected and competitive marketplace, brands that invest in building authentic, meaningful relationships with consumers will reap the rewards of loyalty, advocacy, and sustained success. By understanding the principles, practices, and power of branding, businesses can chart a course towards enduring relevance and resonance in 2024 and beyond. | jkbranding | |
1,885,143 | How to resolve Docker Compose Warning WARN[0000] Found orphan containers | Recently I got the docker compose error: Warning WARN[0000] Found orphan containers... | 0 | 2024-06-12T04:45:50 | https://dev.to/sisproid/how-to-resolve-docker-compose-warning-warn0000-found-orphan-containers-2a11 | docker, linux, dockercompose | Recently I got the docker compose error:
```Warning WARN[0000] Found orphan containers ([container-name]) for this project. If you removed or renamed this service in your compose file, you can run this command with the — remove-orphans flag to clean it up.```
when I was trying to deploy more than 1 Postgresql container within my local machine for testing purposes. It was not the Postgresql that had the issue, but rather my docker-compose.yaml file that has the issue. It seems that the issue was because I used the same directory name for both of the Postgresql projects.
**Before**
```yaml
services:
my-postgre:
container_name: my_postgre
image: postgres:alpine
restart: always
environment:
POSTGRES_DB: mydb
POSTGRES_USER: me
POSTGRES_PASSWORD_FILE: /run/secrets/postgres_password
volumes:
- pgdata:/var/lib/postgresql/data
- ./backup:/home/backup
secrets:
- postgres_password
ports:
- 5424:5432
networks:
- my_network
volumes:
pgdata:
networks:
my_network:
driver: bridge
secrets:
postgres_password:
file: ./postgres_password.txt
```
Based on the documentation [here](https://docs.docker.com/compose/reference/#use--p-to-specify-a-project-name). We can solve the above issue using several ways.
#1 Running `docker compose` command with `-p` parameter.
`sudo docker compose -p my-project-name up -d`
#2 Adding the project name in the `docker-compose.yaml` file.
I added the project name to distinguish between the two projects and now both of them running as expected.
**After**
```yaml
# adding the project name here
name: my-project-name
services:
my-postgre:
container_name: my_postgre
image: postgres:alpine
restart: always
environment:
POSTGRES_DB: mydb
POSTGRES_USER: me
POSTGRES_PASSWORD_FILE: /run/secrets/postgres_password
volumes:
- pgdata:/var/lib/postgresql/data
- ./backup:/home/backup
secrets:
- postgres_password
ports:
- 5424:5432
networks:
- my_network
volumes:
pgdata:
networks:
my_network:
driver: bridge
secrets:
postgres_password:
file: ./postgres_password.txt
```
I know this is not much but hopefully, you found this post useful somehow. Happy coding! | sisproid |
1,847,053 | Kubernetes Dashboard Part 3: Helm Release Management | TL;DR: In this blog, the authors talk about the helm dashboard by Devtron and how it can solve... | 27,311 | 2024-06-12T04:43:16 | https://devtron.ai/blog/kubernetes-dashboard-for-helm-release-management/ | helm, kubernetes, devtron, devops | TL;DR: In this blog, the authors talk about the helm dashboard by Devtron and how it can solve various issues related to helm CLI and help you manage everything around helm through the intuitive dashboard.
This blog will discuss how the HELM dashboard is used to view the installed Helm charts, see their revision history and corresponding k8s resources, and how it brings convenience to the developer and DevOps team in all organizations.
This blog is the third part of the Kubernetes Dashboard blog series. Read part 2 on the [Kubernetes dashboard for cluster management](https://devtron.ai/blog/kubernetes-dashboard-for-cluster-management/) to understand how to simplify multicluster cluster management for large teams. Read Part 1 on [Kubernetes Dashboard for Application Management](https://devtron.ai/kubernetes-dashboard-for-application-management/?ref=devtron.ai) to witness the ease of deploying apps onto Kubenrtess on day 1.
[Devtron](https://devtron.ai/?ref=devtron.ai), an open-source Kubernetes-native application management platform, introduced the HELM dashboard to get real visibility of all your HELM deployments across multiple clusters in one plane.
Challenges while deploying with HELM
As HELM came with the ability to template, package, and deploy applications, more and more organizations started adopting Kubernetes. It is said that at least 70% of the companies using Kubernetes today use HELM for deployments.
However, a few operational challenges exist while deploying apps at scale using HELM.
1. Since HELM is a CLI-based tool, it involves a learning curve to remember all the commands for app deployments.
2. No solid mechanism to view the health and status of applications deployed using HELM
3. Lack of understanding of the relation between workloads resources for respective HELM charts
4. Identifying the difference in HELM chart versions while troubleshooting issues is a big pain as the activity is carried out manually.
5. And the visibility into various apps getting deployed into multiple clusters is time-consuming work.
6. Popular GitOps tools such as Argo CD, which supports HELM deployments, don't store historical data of HELM charts.
Hence Devtron has launched the open-source HELM dashboard to bring convenience for developers and DevOps while deploying with HELM.
## Devtron HELM Dashboard for app visibility and management
Devtron HELM Dashboard is an open-source web interface for HELM-based app deployments. It provides visibility into the status of HELM-based deployments across clusters and helps you to view resources such as pods, workloads, resources, services, infrastructure, etc, in a single pane. With Devtron, your developers and Ops team can troubleshoot and diagnose problems in HELM releases from the UI.
{% embed https://www.youtube.com/watch?v=VivAj9Q-JVs %}
## Multicluster visibility of all HELM deployments
Devtron HELM dashboard provides information about all the HELM-based deployment across multiple clusters in a single plane. The dashboard provides information such as namespace, health status, deployment date of all the applications deployed using HELM in from Devtron or the CLI.
## HELM Chart store
Devtron dashboard provides HELM charts for key tools and software important to automate the CI/CD process for Kubernetes app deployments. Our platform allows you to upload your own HELM charts to our store too. The best part is you can select and group the HELM charts of all the apps you need and deploy them at once. This feature is helpful for developers or the DevOps team while creating new environments.
## Application deployment details in real-time
Devtron HELM dashboard provides details of the resources of each application. Developers can visualize all resources grouped according to classes, such as workloads, services, networking, and configuration and storage.
## Configure HELM values from the web interface
Devtron HELM dashboard allows developers and the DevOps team to configure all the values of HELM charts from the UI itself. Since Devtron stores all the HELM charts in its store, teams can quickly view the Readme docs and make necessary edits quickly.
## Troubleshooting pods in the HELM dashboard
After HELM-based deployment, using the Devtron HELM dashboard, one can easily log in to any of the pods and go through the logs to troubleshoot issues or simply diagnose or validate the health status of pods.
## Understand the difference in the HELM charts
Devtron HELM dashboard allows you to identify the difference between different HELM charts of an application. Suppose a new deployment is improper or applications are not behaving as expected. In that case, developers should be able to debug and identify newly done changes to HELM charts and fix the problem. In case they feel the changes cannot be undone, they can quickly select a previous version of HELM charts to roll back the application.
## Guaranteed outcomes of Devtron Kubernetes dashboard
With the Kubernetes dashboard, you can improve Kubernetes admin and Ops team productivity in managing Kubernetes clusters and reduce mean time to resolve issues with central plane visibility and controls of all nodes across clusters.
Kubernetes Dashboard Ecosystem
Open source Devtron Kubernetes dashboard is available in different deployment options on-prem and managed. Recently Devtron has also released a [desktop client version](https://devtron.ai/blog/introduction-to-devtron-kubernetes-client/) for the Kubernetes dashboard.
[Try Devtron open-source Kubernetes dashboard](https://docs.devtron.ai/install?ref=devtron.ai) for free. | devtron_inc |
1,885,141 | How Should You Handle Negative Reviews? | Buy Yelp Reviews You may have an awesome business, providing an awesome service or product, but... | 0 | 2024-06-12T04:42:08 | https://dev.to/alfred_ben/how-should-you-handle-negative-reviews-5cmd | webdev, javascript, beginners, programming | [Buy Yelp Reviews](https://mangocityit.com/service/buy-yelp-reviews/
)
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1,885,140 | Salesforce Data Cloud Implementation Strategies 2024 | In the ever-evolving digital landscape, businesses are constantly seeking ways to optimize their... | 0 | 2024-06-12T04:40:12 | https://dev.to/shruti_sood_543de8c196a4a/salesforce-data-cloud-implementation-strategies-2024-g06 | In the ever-evolving digital landscape, businesses are constantly seeking ways to optimize their operations and deliver superior customer experiences. Salesforce Data Cloud has emerged as a transformative tool, providing businesses with the capability to harness their data effectively. This post will explore the key strategies for successful Salesforce Data Cloud implementation, via strong Salesforce Support Services.
**1. Comprehensive Data Assessment**
The foundation of a successful Salesforce Data Cloud implementation lies in a thorough data assessment. Businesses must evaluate their existing data landscape, identifying key data sources, data quality issues, and integration requirements. [Salesforce Implementation Services](https://www.fexle.com/salesforce-implementation-services) can play a pivotal role in this phase, offering expertise in assessing data readiness and mapping out a tailored implementation plan.
**2. Define Clear Objectives and KPIs**
Before diving into the technical aspects, it's essential to define clear objectives and key performance indicators (KPIs). What does your business aim to achieve with Salesforce Data Cloud? Whether it's improving customer insights, enhancing data-driven decision-making, or streamlining operations, having well-defined goals will guide the implementation process and ensure alignment with business objectives.
**3. Prioritize Data Integration**
Integrating disparate data sources into a unified platform is one of the core capabilities of Salesforce Data Cloud. Effective data integration ensures that data from various systems, such as CRM, ERP, and marketing platforms, is consolidated and accessible in real-time. Leveraging Salesforce Implementation Services can help businesses seamlessly connect their data sources, ensuring a smooth and efficient integration process.
**4. Focus on Data Quality and Governance**
High-quality data is the backbone of any successful data strategy. Implementing robust data quality and governance frameworks is essential to maintain data accuracy, consistency, and reliability. Salesforce Support Services can assist in setting up data governance policies, data cleansing processes, and ongoing monitoring to ensure data integrity.
**5. Leverage Advanced Analytics and AI**
Salesforce Data Cloud offers advanced analytics and AI capabilities that can unlock valuable insights from your data. Implementing predictive analytics, machine learning models, and AI-driven recommendations can significantly enhance decision-making processes. Salesforce Implementation Services can provide the necessary expertise to integrate these advanced features and tailor them to your business needs.
**6. Ensure Scalability and Flexibility**
As your business grows, so will your data. Ensuring your Salesforce Data Cloud implementation is scalable and flexible is crucial for long-term success. This involves designing a scalable architecture, optimizing storage, and planning for future data expansion. Salesforce Support Services can help you build a resilient and adaptable data infrastructure that can evolve with your business.
**7. Invest in Training and Change Management**
A successful Salesforce Data Cloud implementation is not just about technology—it's also about people. Training and change management is essential to ensure your team can effectively use the new tools and processes. Salesforce Implementation Services often include training programs and change management support to help your team transition smoothly and embrace the new data-driven culture.
Also Check - [Top 5 Strategies for Salesforce Data Cloud Implementation](https://www.fexle.com/blogs/top-salesforce-data-cloud-implementation-strategies/)
**Conclusion**
In 2024, the strategic implementation of Salesforce Data Cloud can be a game-changer for businesses looking to leverage their data more effectively. By focusing on comprehensive data assessment, clear objectives, robust data integration, quality governance, advanced analytics, scalability, and effective training, businesses can unlock the full potential of their data. You can hire Salesforce Support Services as well. The expertise and support by the certified professionals helps you stay ahead in the competitive landscape and brings data-driven success.
| shruti_sood_543de8c196a4a | |
1,885,139 | Issues with Modern Games, or, How to Engage a Game's Community | This is an important topic because I think that we're starting to stray away from everlasting games.... | 0 | 2024-06-12T04:28:46 | https://dev.to/chigbeef_77/issues-with-modern-games-or-how-to-engage-a-games-community-1ic5 | gamedev | This is an important topic because I think that we're starting to stray away from everlasting games. Before I go on, great games are still made, and I do get excited when I hear about all the cool games my friends are playing and all the features they have, sometimes it's just amazing what is being developed.
We're going to step back to learn from some of the original big-time game creators, and see when we can learn.
NOTE: TL;DR AT END
## Multiplayer
This goes without saying, and is definitely still implemented a lot. It's also become much easier to implement with all the helpful tools that exist for networking. From what I know, Helldivers 2 and Fortnite are actually really good examples of this. People want to play with real people, especially their friends.
Now, long distance multiplayer is a bit hard, especially for indie or solo developers, but there are alternatives.
Firstly, you can implement local multiplayer. This is much simpler, and would allow multiple players to spin up their own "server" to connect to and play together.
Secondly, there's same machine multiplayer. This was a favorite of flash games back in the day, where you would squeeze onto one keyboard with your friend to battle each other. This shouldn't be your first reach these days, and it would be much nicer to have local multiplayer instead.
If you want to implement multiplayer into your game, I would suggest looking into websockets, or alternatively, your game engine may have network capabilities all there ready for you.
Multiplayer is an easy way to get a community going for your game, people love playing against each other, or even together to beat a goal. You may be developing a single player game though, and there are cases where a game is objectively single player, but don't stress, there are other things you can implement to boost your community.
## Speedrunning
Speedrunning is one of the most interesting parts of a game's community. Most modern games have many speedrunners, which is good, but what makes a game more "speedrunnable."
Back in 1993, DOOM was released. After completing a level, you were met with an intermission, which gave you some statistics about your run. Importantly, there was the time it took you to complete the level, along with a par time. Imagine how great it would've felt to beat your friends time by a single second. It's no wonder that DOOM's speedrunning community is still strong *over 30 years later*. So if you can, maybe consider adding a timer to your game.
That's not the only thing DOOM did well, there was also a recording method that created what was called "demos". These recorded the player input and saved it to a file. This was important (especially back then) because a demo file was considerably smaller than a video file, making it easier to transport. Moderators also got to take a look at each frame of input to see what a person was doing, which is great for cheating checks. This feature isn't too hard to implement, especially on smaller games with fewer possible inputs.
Games these days usually use regular recording and third party timers for speedrunning, which is fine and works just fine. Just think to yourself while you're developing your game whether people would even want to speedrun your game.
## Competitive Play
Quake's deathmatch, Fortnite's battle royale, Rocket League's... battle?
It's like multiplayer, except against real people, on a large scale. The biggest games are the ones that end up as esports. The grind that players go through to optimize strategies, whether it's map control, or hitting a ball into the goal every time.
Once you've implemented multiplayer, try to make a competition or tournament around your game. Make people *want* to be the best at it, and spend a lot of time learning all the intricate mechanics you implemented (whether on purpose or accidentally).
If you aren't able to implement multiplayer, it may be useful just to add a simple leaderboard system, where player's aren't battling in real time, but there's still a world-wide competitive aspect.
## Modding
In my opinion, this is *the most important* factor that will boost a game's community.
People still make DOOM maps to this day, and will probably continue to do so. There are a few reasons that modding keeps a game alive so well.
Firstly, you can only make so many features, levels, and so on, so why not let the community make infinitely more than you ever could? If modding isn't implemented, what you make is it, that's the end of the game. Image if DOOM was 3 episodes and that was it. However, with the aspect of modding, you can download and play maps, allowing you to play the game for much longer. You may think this would take away from sales of your game, however, DOOM II sales were massive
Secondly, modding of features, not just maps. Sure modding a new level is cool, but being able to add new guns, new characters, new textures, ultimately will create an entirely new experience in your game, to the point that it's unrecognizable. This also can lead to new games being developed from your game, such as Quake being the base for many, *many* games.
Even though I think this is the most important part of a community, it seems to be done *less*. Or at least it's harder to do. Imagine if you could create your own level for triple A games, the community would go crazy. Ultimately, I think what may kill this is game engines. Game developers don't create a level editor, so they can't give it to the community.
Personally, I'm creating an animation tool for my game studio, and it works with an external script to control the animation of the characters. All a modder has to do is learn the very simple language of that script, and they will be able to add whatever animation they want. This wasn't even the original plan for my tool, but I would be stupid to turn down the community by redacting the animations.
## TL;DR
I do think this is a long block of text, so here's a simpler version.
There are 4 aspect that will boost a game's community.
1. Multiplayer (WAN, LAN, same machine)
2. Speedrunning (Timer, recorder)
3. Competition (FFA, Team Battle, etc.)
4. Modding (New levels, new features, animations)
Out of all of those, I personally think modding is the most important.
Try as hard as you can to cater to these communities, and your game will be the better for it | chigbeef_77 |
1,885,137 | Access Modifiers in TypeScript: The Gatekeepers | Access modifiers in TypeScript are essential tools for managing the accessibility of class members... | 27,696 | 2024-06-12T04:24:37 | https://dev.to/nahidulislam/access-modifiers-in-typescript-the-gatekeepers-50i | typescript, webdev, programming, learning | Access modifiers in TypeScript are essential tools for managing the accessibility of class members (properties and methods) within our code. By controlling who can access and modify these members, access modifiers help us implement encapsulation, a core principle of object-oriented programming. We can use class members within their own class, from anywhere outside the class, or within any child or derived class.
Access modifiers in TypeScript act as gatekeepers, controlling the visibility and accessibility of class members. They prevent invalid usage and maintain data integrity. If not explicitly set, TypeScript automatically assigns the public modifier, making all members accessible from anywhere.
TypeScript provides three primary access modifiers: `public`, `private`, and `protected`. Let's explore each one in detail.
## 1. Public
The `public` modifier is the default access level in TypeScript. When a class member is marked as `public`, it means that the member can be accessed from anywhere: inside the class, outside the class, or even in subclasses. If we do not specify an access modifier, the member is implicitly `public`.
**Example:**
```typescript
class Animal {
public name: string;
constructor(name: string) {
this.name = name;
}
public move(distance: number): void {
console.log(`${this.name} moved ${distance} meters.`);
}
}
const dog = new Animal('Dog');
dog.move(10); // Accessible
console.log(dog.name); // Accessible
```
In the example above, both the `name` property and the `move` method are `public`, allowing unrestricted access.
## 2. Private
The `private` modifier restricts access to the member only within the class it is defined. This means that private members cannot be accessed or modified from outside the class, including in derived classes.
**Example:**
```typescript
class Animal {
private name: string;
constructor(name: string) {
this.name = name;
}
public move(distance: number): void {
console.log(`${this.name} moved ${distance} meters.`);
}
}
const cat = new Animal('Cat');
cat.move(5); // Accessible
// console.log(cat.name); // Error: Property 'name' is private and only accessible within class 'Animal'.
```
Here, the `name` property is private, so attempting to access `cat.name` from outside the class results in an error.
## 3. Protected
The `protected` modifier allows access to the member within the class it is defined and in any subclass derived from it. However, it still restricts access from outside these classes.
**Example:**
```typescript
class Animal {
protected name: string;
constructor(name: string) {
this.name = name;
}
protected move(distance: number): void {
console.log(`${this.name} moved ${distance} meters.`);
}
}
class Bird extends Animal {
public fly(distance: number): void {
console.log(`${this.name} is flying.`);
this.move(distance); // Accessible
}
}
const eagle = new Bird('Eagle');
eagle.fly(20); // Accessible
// eagle.move(20); // Error: Property 'move' is protected and only accessible within class 'Animal' and its subclasses.
```
In this example, the `name` property and the `move` method are `protected`, allowing the `Bird` class to access them. However, trying to call `move` on an instance of `Bird` from outside the class hierarchy results in an error.
## Combining Access Modifiers with Constructors
TypeScript allows us to declare and initialize properties directly in the constructor, using access modifiers.
**Example:**
```typescript
class Person {
constructor(public name: string, private age: number) {}
public getAge(): number {
return this.age;
}
}
const john = new Person('John', 30);
console.log(john.name); // Accessible
console.log(john.getAge()); // Accessible
// console.log(john.age); // Error: Property 'age' is private and only accessible within class 'Person'.
```
In this case, `name` is public, so it can be accessed freely, while `age` is private, restricting access to within the class.
## Why Use Access Modifiers?
- **Encapsulation:** By using access modifiers, we can hide the internal implementation details of a class from the outside world, exposing only what is necessary.
- **Maintainability:** Properly encapsulated code is easier to understand and maintain because it clearly defines the boundaries of what can and cannot be accessed.
- **Flexibility:** Encapsulation allows us to change the internal implementation without affecting external code, as long as the public interface remains consistent.
- **Error Prevention:** Restricting access to critical parts of our code helps prevent unintended modifications, reducing the risk of bugs.
## Access Modifiers at a Glance
The table below summarizes the accessibility of class members based on their access modifiers:
## Conclusion
Access modifiers in TypeScript are a powerful feature that help us write safer, more maintainable code by controlling the visibility of class members. By understanding and using `public`, `private`, and `protected` effectively, we can create well-encapsulated classes that are easier to work with and less prone to errors. Whether we're just starting with TypeScript or looking to refine our skills, mastering access modifiers is a key step in becoming proficient developers.
Follow me on: [LinkedIn](https://www.linkedin.com/in/iamnahidul-islam) [Portfolio](https://nahidul-islam.vercel.app/)
| nahidulislam |
1,885,135 | Apple=1 | A post by Ledgardo Diqcuiatco Lacson Jr aka Xhino or Ardy (Roboardy) | 0 | 2024-06-12T04:17:48 | https://dev.to/roboardy/apple1-1lj0 | roboardy | ||
1,885,134 | Asset Management and Trading Innovation: Gametop Brings Higher Liquidity to Game NFTs | NFTs are reshaping the future of the gaming industry. Gametop is committed to providing a unique and... | 0 | 2024-06-12T04:17:34 | https://dev.to/gametopofficial/asset-management-and-trading-innovation-gametop-brings-higher-liquidity-to-game-nfts-53dj | NFTs are reshaping the future of the gaming industry. Gametop is committed to providing a unique and secure integrated gaming environment for players and developers through its innovative NFT asset management and trading platform, ensuring users have the best gaming experience. The emergence of NFTs not only guarantees the uniqueness and authenticity of in-game assets but also grants players true asset ownership, significantly enhancing user engagement and trust.
Uniqueness and Traceability of NFT Assets
Uniqueness
One of the most notable features of NFTs is their uniqueness, meaning each NFT is one of a kind and cannot be duplicated or forged. Gametop uses advanced blockchain technology to ensure that every in-game asset can exist as an NFT, thus preventing common issues of duplication and piracy found in traditional games. Each NFT has its unique identifier and metadata, ensuring the asset’s uniqueness. Whether it’s rare game items, character skins, or virtual real estate, every NFT asset has unique attributes and value.
Traceability
Using blockchain technology, we establish a detailed history for each NFT. Ownership changes, transaction records, and metadata updates for each NFT are permanently recorded on the blockchain, accessible for anyone to view and verify at any time. This mechanism not only enhances the credibility of assets but also prevents fraud and theft. Players can fully trust their owned NFTs, with every asset’s origin and ownership being publicly transparent.
Technical Implementation
Gametop adopts mainstream blockchain platforms like Ethereum and Binance Smart Chain, utilizing their mature smart contract and decentralized application (DApp) technologies to ensure the uniqueness and traceability of NFTs. Smart contracts play a crucial role in the creation and trading of NFTs, automatically executing predefined rules to ensure the legality and fairness of all transactions. We also support standard protocols like ERC-721 and ERC-1155, ensuring that in-game NFT assets can seamlessly circulate across different platforms and applications.
Through these technical means, Gametop not only provides players with unique and trustworthy in-game assets but also establishes a transparent and secure trading environment. We believe that such innovation will not only boost user trust and engagement but also bring new vitality and opportunities to the gaming industry.
Convenient NFT Trading Platform
Platform Design
Gametop’s NFT trading platform is designed with user-friendliness at its core, aiming to provide an intuitive and feature-rich trading environment. We have meticulously designed the platform’s user interface to be simple to operate, making it easy for even novice users to get started. The homepage showcases various popular NFT assets and offers detailed classification and filtering functions to help users quickly find assets of interest. We have also integrated a personalized recommendation system that suggests potential NFT assets based on users’ transaction history and preferences, enhancing the trading experience.
Trading Process
The NFT trading process on Gametop is straightforward, ensuring users can smoothly complete each transaction. Users can find desired NFT assets through search functions or by browsing categories. On the asset detail page, users can view detailed information, transaction history, and current prices. After confirming the purchase, users only need to click the “Buy” button, and the system will automatically generate a smart contract and execute the transaction. The entire process is transparent and efficient, allowing users to track transaction status in real time, ensuring the security and reliability of every transaction.
Security Assurance
In terms of transaction security, Gametop employs multi-layered protective measures. We utilize smart contract technology to ensure all transactions are automatically executed under predefined rules, avoiding human intervention and potential security vulnerabilities. The platform employs advanced encryption technologies to protect user data and transaction information, preventing hacker attacks and data breaches.
User Experience and Convenience
User Interface
When designing the user interface, Gametop places special emphasis on enhancing user experience. The platform adopts a modern design style with a clean and clear interface and intuitive operations. We clearly divide main functional modules so that users can quickly find the necessary functions and information. Whether browsing NFT assets, viewing transaction records, or managing personal accounts, users can complete operations within a few clicks. Additionally, we provide multi-language support to ensure that users worldwide can use the platform without barriers.
Convenient Features
To further enhance the convenience of user transactions, Gametop offers a range of practical features. For example, the quick search function allows users to find desired NFT assets swiftly through keywords, categories, and price ranges. The categorized browsing function displays NFT assets by type, rarity, and popularity, making it easy for users to filter. The personalized recommendation system suggests potential NFT assets based on users’ transaction history and preferences, improving transaction efficiency and satisfaction.
By optimizing the user interface, providing convenient features, and offering comprehensive customer support, Gametop aims to provide the best trading experience for users. Our goal is to enable every user to participate in NFT trading easily and enjoyably, fully experiencing the unique charm of blockchain gaming.
Technological Innovation and Future Development
Technological Innovation
Gametop always stands at the forefront of technological innovation, dedicated to continually enhancing the platform’s performance and functionality. In NFT asset management and trading, we adopt the latest blockchain technologies and protocols to ensure the platform’s security, stability, and scalability.
We also plan to introduce more intelligent contract features to support more complex trading and asset management needs. This includes multi-signature functionality, time-lock mechanisms, and conditional transaction execution, ensuring users receive secure and reliable services in various transaction scenarios. Through these technological innovations, Gametop not only enhances the platform’s core competitiveness in the blockchain gaming field but also provides users with a wider range of functional choices and higher quality service experiences.
Through technological innovation and diverse game choices, we provide users with a multi-faceted blockchain gaming environment. This advantage promotes the long-term development of the platform and adds new momentum to the liquidity of NFTs.
Future Development
Looking ahead, Gametop will continue to deepen its involvement in the NFT field, launching more innovative features and services. We plan to develop more intelligent NFT asset management tools, enabling users to easily manage their asset portfolios, conduct efficient asset allocation, and trading, thereby enhancing their gaming experience.
Gametop will also further optimize user experience, improving platform usability and interactivity. We plan to introduce more community interaction features, such as user review systems, transaction ratings, and social sharing, enhancing communication and interaction among users.
In terms of technology, we will continue to stay sensitive to emerging technologies, actively exploring their applications, such as virtual reality (VR) and augmented reality (AR) in NFTs, and artificial intelligence (AI) in asset management and recommendation systems. Through these continuous innovations and developments, Gametop aims to become a global leading NFT asset management and trading platform, meeting the growing needs of users and driving the prosperity and development of the blockchain gaming and NFT industry.
 | gametopofficial | |
1,247,502 | Stop Hardcoding Maps Platform API Keys! | One of the really cool things about the new suite of APIs that Google Maps Platform has been... | 27,695 | 2024-06-12T04:15:41 | https://dev.to/bamnet/stop-hardcoding-maps-platform-api-keys-5c2n | googlemaps, jwt, firebase, googlecloud | One of the really cool things about the new suite of APIs that Google Maps Platform has been releasing lately ([Routes API](https://developers.google.com/maps/documentation/routes), [Places API](https://developers.google.com/maps/documentation/places/web-service/op-overview), etc) is that they look and feel a lot like other Google Cloud Platform APIs. They're exposed via gRPC, support field masks, and let developers authenticate via OAuth. A really helpful side effects of OAuth is support for JSON Web Tokens (JWT) credentials which allow apps to do a much better job securing client-side applications.
Classic Google Maps APIs rely on a a hardcoded API key which is not great. Hardcoding passwords was cool in 2005 (maybe?) but it's 2024, we can do better.
Using a small snippet of code, our app can generate a unique auth token for each website visitor that will expire after a defined period. Even if the user maliciously "borrowed" that token, it would only be valid until the expiration period you specified.
## JWT Intro
If you're new to JWTs like I am, they are base64 encoded JSON blobs that get signed using a private key. APIs can read contents of that JSON object and verify the signature to authenticate them. Here's what one looks like:
```
eyJhbGciOiJSUzI1NiIsImtpZCI6ImVlODk1OWMzYzFhMDdlMTBlZGJjMDE3NWI2ZmZmN2I1ZGYyOTBiZTIiLCJ0eXAiOiJKV1QifQ.eyJzY29wZSI6Imh0dHBzOi8vd3d3Lmdvb2dsZWFwaXMuY29tL2F1dGgvZ2VvLXBsYXRmb3JtLnJvdXRlcyIsImlzcyI6InVidW50dS12bUBob2xpZGF5cy0xMTcwLmlhbS5nc2VydmljZWFjY291bnQuY29tIiwic3ViIjoidWJ1bnR1LXZtQGhvbGlkYXlzLTExNzAuaWFtLmdzZXJ2aWNlYWNjb3VudC5jb20iLCJhdWQiOiJodHRwczovL3JvdXRlcy5nb29nbGVhcGlzLmNvbS8iLCJleHAiOjE2Njc4ODQ0NTIsImlhdCI6MTY2Nzg4NDMzMn0.Zey0GtvSH78_xfBTNL-Ij0qm1dK9wqDc5nllYLPZyWNp_V5sYVKaPpWSjJ2IRVHBdhKBLYgXVKLty7Dlo0BMW9SJ4eexIxmdM8IR3CeH5SmYLl4pQxV3S8eO_5T41B6LCD49gKTtlXIWvtCoGitWDSYiFCZauf2zoIEa5XZ_TkazMr1DGYbc9w8UvtXVARAby2WRbSiHyqkjSsAU5HoKClKhaw7NaP1vNJ-7IlpTz9t-sTSZwl-6wur65gI_FtAGiohWPUILRY-YKMhb_wXQ5AtlDUmvGKdqNzuXBMmk8-iiQTwmYPuWQBNt0MtK7hfghWyWubUjBfT0t4yiGSrHmA
```
If you [decode](https://jwt.io/#id_token=eyJhbGciOiJSUzI1NiIsImtpZCI6ImVlODk1OWMzYzFhMDdlMTBlZGJjMDE3NWI2ZmZmN2I1ZGYyOTBiZTIiLCJ0eXAiOiJKV1QifQ.eyJzY29wZSI6Imh0dHBzOi8vd3d3Lmdvb2dsZWFwaXMuY29tL2F1dGgvZ2VvLXBsYXRmb3JtLnJvdXRlcyIsImlzcyI6InVidW50dS12bUBob2xpZGF5cy0xMTcwLmlhbS5nc2VydmljZWFjY291bnQuY29tIiwic3ViIjoidWJ1bnR1LXZtQGhvbGlkYXlzLTExNzAuaWFtLmdzZXJ2aWNlYWNjb3VudC5jb20iLCJhdWQiOiJodHRwczovL3JvdXRlcy5nb29nbGVhcGlzLmNvbS8iLCJleHAiOjE2Njc4ODQ0NTIsImlhdCI6MTY2Nzg4NDMzMn0.Zey0GtvSH78_xfBTNL-Ij0qm1dK9wqDc5nllYLPZyWNp_V5sYVKaPpWSjJ2IRVHBdhKBLYgXVKLty7Dlo0BMW9SJ4eexIxmdM8IR3CeH5SmYLl4pQxV3S8eO_5T41B6LCD49gKTtlXIWvtCoGitWDSYiFCZauf2zoIEa5XZ_TkazMr1DGYbc9w8UvtXVARAby2WRbSiHyqkjSsAU5HoKClKhaw7NaP1vNJ-7IlpTz9t-sTSZwl-6wur65gI_FtAGiohWPUILRY-YKMhb_wXQ5AtlDUmvGKdqNzuXBMmk8-iiQTwmYPuWQBNt0MtK7hfghWyWubUjBfT0t4yiGSrHmA) that token, you can see it contains information about the key it was signed with:
```json
{
"alg": "RS256",
"kid": "ee8959c3c1a07e10edbc0175b6fff7b5df290be2",
"typ": "JWT"
}
```
and, more importantly, payload with information about who issued the token, what it can be used for, and when it will expire:
```json
{
"scope": "https://www.googleapis.com/auth/geo-platform.routes",
"aud": "https://routes.googleapis.com/",
"exp": 1667880959,
"iat": 1667880839,
"iss": "ubuntu-vm@holidays-1170.iam.gserviceaccount.com",
"sub": "ubuntu-vm@holidays-1170.iam.gserviceaccount.com"
}
```
In my experience, most Google Maps Platform APIs expects a token to contain a payload with the following fields:
field | description |
------|-----|
`exp` | Expiration time for the token. |
`iat` | Issued time for the token (aka now). |
`aud` | API endpoint the token is intended for, like `https://routes.googleapis.com/`
`scope` | Scopes, separated by spaces, this token can be used for, like `https://www.googleapis.com/auth/geo-platform.routes`
_From what I can tell, either a `scope` or `aud`ience field needs to be set. I don't know what's the "right" way._
I've collected a bunch of options for Scope and Audience [here](https://github.com/bamnet/gmp-jwt/blob/main/apis/apis.go).
## Generating a JWT
The biggest downside to JWTs is that you have to generate them on the fly - you can't just hardcode them into your app like you could with good old AIza. Generating a JWT involves building an JSON object with the right fields (see above), signing it, and then base64 encoding it to a string. https://jwt.io/introduction walks through this in glorious detail.
To make that step easier, I created a little Go backend which will generate tokens and sign them using a GCP Service Account: https://github.com/bamnet/gmp-jwt.
Running this backend somewhere like Cloud Run makes it easy to start generating tokens since you get access to a Default Service Account but you can run this anywhere and set [Application Default Credentials](https://cloud.google.com/docs/authentication/application-default-credentials).
### But what protects the JWT generator?
Great question. Even though our JWT tokens are tightly scoped and moderately TTLed, an attacker could just scrape them from our backend that generates them. That would be no fun.
Using [Firebase AppCheck](https://firebase.google.com/docs/app-check) we can verify that the environment requesting a token looks legit before giving them a JWT.
The frontend just needs to include recaptcha v3 (which is totally silent now - no more traffic lights, cross walks, or bicycles) and a bit of Firebase code to wire up the token.
## Sending a JWT to Google Maps Platform
To authenticate using a JWT to a modern Google Maps Platform API, we use Bearer Authentication. Set the `Authorization` header to `Bearer ${token}`.
In JavaScript, that snippet might look like:
```ts
const response = await fetch('https://routes.googleapis.com/directions/v2:computeRoutes', {
method: 'POST',
headers: {
'Authorization': 'Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6ImVlODk1OWMzYzFhMDdlMTBlZGJjMDE3NWI2ZmZmN2I1ZGYyOTBiZTIiLCJ0eXAiOiJKV1QifQ.eyJzY29wZSI6Imh0dHBzOi8vd3d3Lmdvb2dsZWFwaXMuY29tL2F1dGgvZ2VvLXBsYXRmb3JtLnJvdXRlcyIsImlzcyI6InVidW50dS12bUBob2xpZGF5cy0xMTcwLmlhbS5nc2VydmljZWFjY291bnQuY29tIiwic3ViIjoidWJ1bnR1LXZtQGhvbGlkYXlzLTExNzAuaWFtLmdzZXJ2aWNlYWNjb3VudC5jb20iLCJhdWQiOiJodHRwczovL3JvdXRlcy5nb29nbGVhcGlzLmNvbS8iLCJleHAiOjE2Njc4ODQ0NTIsImlhdCI6MTY2Nzg4NDMzMn0.Zey0GtvSH78_xfBTNL-Ij0qm1dK9wqDc5nllYLPZyWNp_V5sYVKaPpWSjJ2IRVHBdhKBLYgXVKLty7Dlo0BMW9SJ4eexIxmdM8IR3CeH5SmYLl4pQxV3S8eO_5T41B6LCD49gKTtlXIWvtCoGitWDSYiFCZauf2zoIEa5XZ_TkazMr1DGYbc9w8UvtXVARAby2WRbSiHyqkjSsAU5HoKClKhaw7NaP1vNJ-7IlpTz9t-sTSZwl-6wur65gI_FtAGiohWPUILRY-YKMhb_wXQ5AtlDUmvGKdqNzuXBMmk8-iiQTwmYPuWQBNt0MtK7hfghWyWubUjBfT0t4yiGSrHmA',
'Content-Type': 'application/json',
'X-Goog-FieldMask': 'routes.duration,routes.distanceMeters',
},
body: JSON.stringify({
// Routes API request body.
}),
});
```
I wouldn't dream of sharing an API Key in a blogpost but an expired JWT, no problem!
## Putting it all together
### Server-Side
You need to deploy a server endpoint somewhere which will mint JWTs, optionally after checking Firebase App Check. A sample Cloud Run function I use is @ https://github.com/bamnet/gmp-jwt.
### Client-Side
1. (optional) Get an app check token from Firebase.
2. Requests a JWT from the server endpoint you deployed above, optionally passing that app check token from Step 1.
3. Call the desired Google Maps Platform API passing `Authorization: Bearer ${token}`, passing the token from Step 2.
4. ???
5. Profit.
Here's an example in JS, but you can do the same thing in Android & iOS:
```ts
// Initialize Firebase.
const app = initializeApp(firebaseConfig);
// Initialize AppCheck.
const appCheck = initializeAppCheck(app, {
provider: new ReCaptchaV3Provider(/** reCAPTCHA Key */ ''),
isTokenAutoRefreshEnabled: true
});
// Grab an AppCheck token.
const appCheckToken = await getToken(appCheck).then(t => t.token);
// Call our backend to convert the AppCheck token into a JWT.
const jwt = await fetch(/** JWT Minting Backend */ '', {
headers: {
'X-Firebase-AppCheck': appCheckToken,
}
}).then((data) => data.text());
// Call the Routes API.
// Look ma, no hardcoded API key!
const response = await fetch('https://routes.googleapis.com/directions/v2:computeRoutes', {
method: 'POST',
headers: {
'Authorization': `Bearer ${jwt}`, // Pass our JWT!
'Content-Type': 'application/json',
'X-Goog-FieldMask': 'routes.duration,routes.distanceMeters',
},
body: JSON.stringify({
// Routes API request body.
}),
});
console.log(response);
```
Ta-Da, no more hardcoded API key!
### Not-So-Frequently Asked Questions
**Can a single JWT be used calling multiple APIs?**
Yes. In my tests, a token can have multiple scopes, but only 1 audience. Scopes are separated with spaces. To generate a token for both Places and Routes, you'd set:
```json
{
"scope": "https://www.googleapis.com/auth/geo-platform.routes https://www.googleapis.com/auth/maps-platform.places",
...
}
```
**Couldn't you proxy all requests through a trusted server which added & removed an API key?**
Yes, but then you have a dependency in the serving path for ~every request to an API. That adds some marginal latency and could have scaling challenges for high-QPS APIs like Map Tiles or Places Autocomplete. That also means the proxy servers will see all requests which might mean more privacy / compliance work.
**Does this work for the Maps JavaScript API?**
No, but that sounds like a good [feature request](https://issuetracker.google.com/savedsearches/558438). | bamnet |
1,885,133 | Asset Management and Trading Innovation: Gametop Brings Higher Liquidity to Game NFTs | A post by 游戏顶部 | 0 | 2024-06-12T04:15:04 | https://dev.to/gametopofficial/asset-management-and-trading-innovation-gametop-brings-higher-liquidity-to-game-nfts-3gb0 | gametopofficial | ||
1,885,132 | Navigating ADHD and Substance Use with Dr. Hanid Audish: Insights into Dangers and Preventive Measures | Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by... | 0 | 2024-06-12T04:13:00 | https://dev.to/drhanidaudish/navigating-adhd-and-substance-use-with-dr-hanid-audish-insights-into-dangers-and-preventive-measures-2e3b | Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by symptoms of inattention, impulsivity, and hyperactivity. While attention deficit hyperactivity disorder primarily affects children and adolescents, it can persist into adulthood, presenting unique challenges and vulnerabilities. One significant concern associated with attention deficit hyperactivity disorder is the increased risk of substance use and abuse, as individuals with attention deficit hyperactivity disorder may turn to drugs or alcohol as a means of self-medication or coping with symptoms. Navigating the intersection of ADHD and substance use requires a comprehensive understanding of the risks involved and proactive measures to prevent adverse outcomes. By exploring the dangers of substance use in individuals with attention deficit hyperactivity disorder and implementing preventive strategies, we can empower parents, educators, and healthcare professionals to support those affected by this complex comorbidity.
Understanding the Link Between ADHD and Substance Use
The relationship between attention deficit hyperactivity disorder and substance use is multifaceted and influenced by various factors, including genetic predisposition, environmental influences, and neurobiological mechanisms. Research suggests that individuals with attention deficit hyperactivity disorder may have an increased susceptibility to substance use disorders due to differences in brain chemistry and reward processing. The impulsivity and sensation-seeking behaviors characteristic of attention deficit hyperactivity disorder may also contribute to experimentation with drugs or alcohol as individuals seek immediate gratification or relief from symptoms. Additionally, co-occurring mental health conditions such as depression, anxiety, or conduct disorder further compound the risk of substance misuse among individuals with attention deficit hyperactivity disorder.
Furthermore, the use of certain medications commonly prescribed to treat attention deficit hyperactivity disorder, such as stimulants like methylphenidate or amphetamine, may also impact substance use risk. While these medications are effective in managing attention deficit hyperactivity disorder symptoms, they carry a potential for misuse or diversion, particularly among adolescents and young adults. Therefore, healthcare providers must carefully monitor medication use and educate patients and their families about the risks associated with misuse or diversion. By addressing underlying risk factors and promoting healthy coping strategies, doctors like Dr. Hanid Audish help mitigate the likelihood of substance use disorders in individuals with attention deficit hyperactivity disorder.
Identifying Risk Factors and Vulnerabilities
Several risk factors and vulnerabilities increase the likelihood of substance use and abuse among individuals with attention deficit hyperactivity disorder. Environmental factors such as family history of substance abuse, peer influences, and socioeconomic stressors may exacerbate underlying vulnerabilities and contribute to maladaptive coping mechanisms. Additionally, difficulties with impulse control, emotion regulation, and executive functioning inherent in attention deficit hyperactivity disorder can heighten susceptibility to peer pressure and experimentation with substances. Furthermore, comorbid mental health conditions such as depression, anxiety, or conduct disorder may compound the risk of substance misuse and complicate treatment efforts.
Moreover, individuals with untreated or undertreated attention deficit hyperactivity disorder may be more susceptible to substance use as they seek relief from persistent symptoms and functional impairments. Without adequate support and intervention, these individuals may resort to self-medication with drugs or alcohol as a means of coping with academic, social, or emotional challenges. Therefore, early identification and intervention are crucial for addressing underlying attention deficit hyperactivity disorder symptoms and preventing the onset of substance use disorders. By addressing risk factors and vulnerabilities proactively, parents, educators, and physicians such as Dr. Hanid Audish help mitigate the impact of attention deficit hyperactivity disorder on substance use and promote healthier outcomes for children and adolescents affected by this comorbidity.
The Role of Family and Social Support
Family and social support systems play a pivotal role in mitigating the risk of substance use among individuals with attention deficit hyperactivity disorder. Strong family bonds, open communication, and positive parental involvement have been shown to reduce the likelihood of substance misuse and promote resilience in children and adolescents with attention deficit hyperactivity disorder. Parents can create a supportive home environment by setting clear expectations, providing structure and routine, and fostering healthy coping mechanisms. Additionally, family therapy and support groups can offer valuable resources and guidance for both parents and children navigating the challenges of attention deficit hyperactivity disorder and substance use.
Doctors including Dr. Hanid Audish convey that peer relationships and social networks also influence substance use behaviors among individuals with attention deficit hyperactivity disorder. Positive peer relationships and involvement in extracurricular activities or community organizations can provide protective factors against substance misuse by promoting social connections, self-esteem, and healthy coping strategies. Educators and school counselors can play a vital role in fostering peer support networks and promoting pro-social behaviors among students with attention deficit hyperactivity disorder. By fostering a supportive and inclusive school environment, educators can help mitigate the risk of substance use and promote academic and social success among students with attention deficit hyperactivity disorder.
Early Intervention and Prevention Strategies
Early intervention and prevention strategies are essential for addressing substance use risks in children and adolescents with attention deficit hyperactivity disorder. Screening for attention deficit hyperactivity disorder and co-occurring mental health conditions should be incorporated into routine healthcare visits to facilitate early identification and intervention. Healthcare providers can collaborate with families, schools, and community organizations to develop individualized treatment plans and support strategies tailored to the unique needs of each child or adolescent with attention deficit hyperactivity disorder. Additionally, psychoeducation programs and skill-building interventions can empower children and adolescents with attention deficit hyperactivity disorder to develop effective coping mechanisms and resistance skills to resist peer pressure and substance use temptations.
Physicians like Dr. Hanid Audish mention that implementing universal prevention programs in schools and communities can help raise awareness about the risks of substance use and promote healthy decision-making skills among youth with attention deficit hyperactivity disorder. These programs may include substance use education, social-emotional learning curricula, and peer mentoring initiatives aimed at promoting positive behaviors and attitudes. By targeting risk factors and enhancing protective factors at multiple levels, early intervention and prevention efforts can help mitigate the impact of attention deficit hyperactivity disorder on substance use and improve long-term outcomes for children and adolescents affected by this comorbidity.
Treatment Approaches and Integrated Care
Effective treatment approaches for individuals with attention deficit hyperactivity disorder and comorbid substance use disorders require a comprehensive and integrated approach that addresses both conditions simultaneously. Integrated care models that combine pharmacological interventions, psychotherapy, and behavioral interventions have been shown to be effective in managing attention deficit hyperactivity disorder symptoms and reducing substance use behaviors. Pharmacotherapy with medications such as stimulants or non-stimulants may help alleviate ADHD symptoms and reduce impulsivity, improving the individual's ability to engage in treatment and resist substance use temptations.
Furthermore, behavioral interventions such as cognitive-behavioral therapy (CBT), contingency management, and motivational interviewing can help individuals with attention deficit hyperactivity disorder develop coping skills, enhance self-regulation, and modify maladaptive behaviors associated with substance use. Family therapy and support groups can also provide valuable resources and support for both individuals with attention deficit hyperactivity disorder and their families, fostering communication, problem-solving skills, and healthy relationship dynamics. Additionally, ongoing monitoring and follow-up care are essential for tracking progress, addressing treatment barriers, and preventing relapse in individuals with attention deficit hyperactivity disorder and substance use disorders.
Addressing Stigma and Promoting Awareness
Addressing stigma and promoting awareness are critical components of efforts to support individuals with attention deficit hyperactivity disorder and reduce the risk of substance use. Stigma surrounding mental health disorders, including attention deficit hyperactivity disorder, can create barriers to seeking treatment and support, leading to feelings of shame, isolation, and reluctance to disclose symptoms or seek help. Educating the public, healthcare providers, and policymakers about the biological basis of ADHD, its impact on functioning, and available treatment options can help dispel misconceptions and reduce stigma.
Moreover, raising awareness about the link between attention deficit hyperactivity disorder and substance use can help destigmatize discussions about these issues and encourage early intervention and support-seeking behaviors. Schools, healthcare providers, and community organizations can play a crucial role in promoting awareness through education campaigns, outreach efforts, and advocacy initiatives aimed at reducing stigma and promoting acceptance of individuals with ADHD. By fostering a culture of understanding, acceptance, and support as encouraged by doctors such as Dr. Hanid Audish, we can create a more inclusive and supportive environment for individuals with attention deficit hyperactivity disorder and reduce the barriers to accessing quality care and resources.
Navigating the intersection of attention deficit hyperactivity disorder and substance use requires a multifaceted approach that addresses underlying risk factors, promotes protective factors, and integrates early intervention and prevention strategies. By understanding the link between attention deficit hyperactivity disorder and substance use, identifying risk factors and vulnerabilities, and implementing comprehensive treatment approaches, we can support individuals with attention deficit hyperactivity disorder and reduce the likelihood of substance use disorders.
Family and social support, early intervention, integrated care, and stigma reduction efforts are essential components of efforts to promote healthier outcomes for children and adolescents affected by this complex comorbidity. By working collaboratively across healthcare, education, and community sectors, we can empower individuals with attention deficit hyperactivity disorder to thrive and lead fulfilling lives free from the harmful effects of substance use.
| drhanidaudish | |
1,885,131 | Exploring ADHD in Sports with Dr. Hanid Audish: Advantages, Hurdles, and Strategies for Triumph | Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by... | 0 | 2024-06-12T04:11:39 | https://dev.to/drhanidaudish/exploring-adhd-in-sports-with-dr-hanid-audish-advantages-hurdles-and-strategies-for-triumph-4j62 | Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by symptoms of inattention, hyperactivity, and impulsivity. While ADHD poses unique challenges in various aspects of life, including academic performance and social interactions, its impact on participation in sports and physical activities is also significant. In this blog, we delve into the intersection of attention deficit hyperactivity disorder and sports, exploring the advantages, hurdles, and strategies for success for children and adolescents with ADHD in athletic endeavors.
Harnessing Hyperactivity: The Advantage of Energy in Sports
One of the potential advantages of attention deficit hyperactivity disorder in sports is the surplus of energy and hyperactivity often associated with the condition. Children and adolescents with ADHD may exhibit higher levels of energy and impulsivity, which can translate into enhanced agility, speed, and reaction times on the sports field. This heightened energy can be particularly advantageous in fast-paced sports such as soccer, basketball, and track and field, where quick reflexes and rapid decision-making are crucial for success.
Doctors like Dr. Hanid Audish mention that while hyperactivity can provide a competitive edge in certain sports, it may also present challenges in others. Sports that require sustained focus, precision, and attention to detail, such as golf or archery, may pose difficulties for individuals with attention deficit hyperactivity disorder who struggle with impulsivity and distractibility. Therefore, understanding the unique strengths and limitations of children and adolescents with attention deficit hyperactivity disorder is essential for guiding their participation in sports and maximizing their potential for success.
Overcoming Challenges: Addressing Inattention and Impulsivity
Despite the potential advantages of hyperactivity, children and adolescents with ADHD may encounter significant hurdles related to inattention and impulsivity in sports settings. Inattention can manifest as difficulty maintaining focus on game strategies, following instructions from coaches, or staying organized during practice sessions. Likewise, impulsivity may lead to impulsive decision-making, erratic behavior on the field, and difficulty adhering to rules and regulations.
To overcome these challenges, coaches, parents, and athletes must work together to implement strategies that address the unique needs of individuals with ADHD in sports as emphasized by physicians such as Dr. Hanid Audish. This may include breaking down instructions into manageable steps, providing visual cues or reminders, and establishing routines to help maintain focus and structure. Additionally, coaches can incorporate techniques such as mindfulness exercises or relaxation techniques to help athletes with ADHD manage impulsivity and stay calm under pressure.
Building Confidence: Fostering Self-Esteem and Belonging
Participating in sports can have a profound impact on the self-esteem and confidence of children and adolescents with attention deficit hyperactivity disorder. Engaging in physical activity provides opportunities for skill development, social interaction, and personal growth, which can contribute to a sense of accomplishment and belonging. For many individuals with ADHD, sports offer a supportive and inclusive environment where they can excel based on their unique strengths and abilities, rather than being defined by their challenges.
Doctors including Dr. Hanid Audish convey that to foster confidence and self-esteem in athletes with attention deficit hyperactivity disorder, coaches and mentors play a crucial role in providing encouragement, positive reinforcement, and constructive feedback. By emphasizing effort, progress, and teamwork, coaches can help athletes with ADHD recognize their potential and develop resilience in the face of adversity. Additionally, creating a supportive team culture that values diversity and celebrates individual differences can further enhance the sense of belonging and acceptance for athletes with attention deficit hyperactivity disorder.
Navigating Social Dynamics: Building Relationships and Communication Skills
In addition to physical challenges, children and adolescents with attention deficit hyperactivity disorder may also encounter difficulties navigating the social dynamics of team sports. ADHD-related symptoms such as impulsivity, inattention, and difficulty regulating emotions can impact social interactions with teammates, coaches, and opponents. As a result, individuals with ADHD may experience challenges in building relationships, communicating effectively, and resolving conflicts on the field.
To support social development in athletes with attention deficit hyperactivity disorder, coaches can facilitate team-building activities, communication exercises, and conflict resolution strategies to promote positive relationships and teamwork as highlighted by physicians like Dr. Hanid Audish. Encouraging open communication, empathy, and mutual respect among team members can help athletes with ADHD feel valued and accepted within the team environment. Additionally, providing opportunities for leadership roles and peer mentorship can empower athletes with Attention Deficit Hyperactivity Disorder to develop social skills, assertiveness, and self-confidence in sports and beyond.
Embracing Individuality: Tailoring Training and Support
Recognizing the diverse needs and preferences of athletes with attention deficit hyperactivity disorder is essential for providing personalized training and support in sports settings. While some individuals may thrive in structured team sports with clear rules and routines, others may prefer individual activities that allow for greater autonomy and self-expression. By embracing the individuality of athletes with ADHD, coaches can tailor training programs, coaching styles, and support strategies to accommodate their unique strengths and challenges.
For athletes with attention deficit hyperactivity disorder who struggle with sensory sensitivity or motor coordination, alternative sports or modified activities may offer a more comfortable and enjoyable experience. Likewise, providing opportunities for breaks, sensory regulation techniques, and accommodations during training sessions can help individuals with ADHD manage overwhelm and maintain engagement in sports. By adapting to the specific needs of each athlete as underscored by doctors such as Dr. Hanid Audish, coaches can create inclusive and supportive environments that enable all participants to thrive and succeed in sports.
Empowering Athletes with ADHD to Achieve Their Full Potential
The intersection of attention deficit hyperactivity disorder and sports presents both challenges and opportunities for children and adolescents seeking to participate in athletic endeavors. While ADHD-related symptoms such as hyperactivity, inattention, and impulsivity may pose hurdles in sports settings, they can also be harnessed as strengths with the right support and strategies in place.
By understanding the unique needs and abilities of athletes with Attention Deficit Hyperactivity Disorder, coaches, parents, and mentors can empower them to overcome challenges, build confidence, and achieve their full potential in sports. Through inclusive and supportive environments that value individuality and celebrate diversity, athletes with attention deficit hyperactivity disorder can thrive and excel on the playing field, fostering resilience, self-esteem, and lifelong enjoyment of physical activity.
| drhanidaudish | |
1,885,130 | Exploring TypeScript Functions: A Comprehensive Guide | TypeScript, a statically typed superset of JavaScript, offers a myriad of features that enhance the... | 0 | 2024-06-12T04:11:02 | https://dev.to/hasancse/exploring-typescript-functions-a-comprehensive-guide-3hii | webdev, typescript, programming, javascript | TypeScript, a statically typed superset of JavaScript, offers a myriad of features that enhance the development experience and help catch errors early in the development process. One of the core components of TypeScript is its robust support for functions. In this blog post, we’ll dive into the various aspects of TypeScript functions, from basic syntax to advanced features.
## Why Use TypeScript Functions?
Functions are fundamental building blocks in any programming language. TypeScript enhances JavaScript functions with static types, providing several benefits:
- Type Safety: Catch errors at compile time rather than at runtime.
- IntelliSense: Get better autocompletion and documentation in your IDE.
- Refactoring: Make large-scale code changes with more confidence.
- Self-Documentation: Type annotations serve as documentation for the expected inputs and outputs.
## Basic Function Syntax
Let's start with the basics. Here’s how you define a simple function in TypeScript:
```
function greet(name: string): string {
return `Hello, ${name}!`;
}
console.log(greet("World")); // Output: Hello, World!
```
In this example:
- name: string specifies that the name parameter must be a string.
- : string after the function parentheses specifies that the function returns a string.
## Optional and Default Parameters
TypeScript allows you to define optional and default parameters:
**Optional Parameters**
Optional parameters are declared using the ? symbol:
```
function greet(name: string, greeting?: string): string {
return `${greeting || "Hello"}, ${name}!`;
}
console.log(greet("World")); // Output: Hello, World!
console.log(greet("World", "Hi")); // Output: Hi, World!
```
**Default Parameters**
Default parameters provide a default value if none is provided:
```
function greet(name: string, greeting: string = "Hello"): string {
return `${greeting}, ${name}!`;
}
console.log(greet("World")); // Output: Hello, World!
console.log(greet("World", "Hi")); // Output: Hi, World!
```
## Rest Parameters
Rest parameters allow you to pass an arbitrary number of arguments to a function:
```
function sum(...numbers: number[]): number {
return numbers.reduce((acc, curr) => acc + curr, 0);
}
console.log(sum(1, 2, 3, 4)); // Output: 10
```
In this example, ...numbers: number[] means that the function can take any number of numeric arguments, which are then available as an array within the function.
## Function Overloads
Function overloads allow you to define multiple signatures for a single function. This is useful when a function can be called with different types or numbers of arguments:
```
function add(a: number, b: number): number;
function add(a: string, b: string): string;
function add(a: any, b: any): any {
return a + b;
}
console.log(add(1, 2)); // Output: 3
console.log(add("Hello, ", "World!")); // Output: Hello, World!
```
In this example, the add function can handle both numeric and string inputs, returning the appropriate type based on the arguments.
## Arrow Functions
TypeScript supports arrow functions, which provide concise syntax and lexical binding:
```
const greet = (name: string): string => `Hello, ${name}!`;
console.log(greet("World")); // Output: Hello, World!
```
Arrow functions are particularly useful for inline functions and callbacks.
## Typing Function Types
You can define types for functions, which can be used to type variables or parameters that expect a function:
```
type GreetFunction = (name: string) => string;
const greet: GreetFunction = (name) => `Hello, ${name}!`;
function callGreet(fn: GreetFunction, name: string): void {
console.log(fn(name));
}
callGreet(greet, "World"); // Output: Hello, World!
```
In this example, GreetFunction is a type alias for a function that takes a string argument and returns a string. This type is then used to type the greet variable and the fn parameter in the callGreet function.
## Conclusion
TypeScript functions are a powerful feature that enhances JavaScript’s capabilities with strong typing and additional syntactic sugar. By leveraging TypeScript’s function features, you can write more robust, maintainable, and self-documenting code.
Whether you’re defining simple functions, handling optional and default parameters, using rest parameters, or employing advanced features like function overloads and typed function types, TypeScript provides the tools you need to write clean and efficient code.
| hasancse |
1,885,129 | Celebrating ADHD Neurodiversity: Fostering Acceptance and Inclusive Environments with Dr. Hanid Audish | ADHD, or Attention Deficit Hyperactivity Disorder, is a neurodevelopmental condition that affects... | 0 | 2024-06-12T04:09:40 | https://dev.to/drhanidaudish/celebrating-adhd-neurodiversity-fostering-acceptance-and-inclusive-environments-with-dr-hanid-audish-j33 | ADHD, or Attention Deficit Hyperactivity Disorder, is a neurodevelopmental condition that affects millions of children and adolescents worldwide. While individuals with ADHD may face challenges in areas such as attention, impulse control, and hyperactivity, they also possess unique strengths and talents that contribute to their neurodiversity. In this blog, we will explore the importance of celebrating attention deficit hyperactivity disorder neurodiversity and fostering acceptance in order to create inclusive environments where individuals with attention deficit hyperactivity disorder can thrive.
Understanding ADHD Neurodiversity
ADHD is not a one-size-fits-all condition; rather, it encompasses a spectrum of experiences and characteristics that vary from person to person. While some individuals with attention deficit hyperactivity disorder may struggle with concentration and organization, others may excel in creative thinking, problem-solving, and hyperfocus. It is essential to recognize and celebrate the diverse talents and abilities of individuals with attention deficit hyperactivity disorder, rather than focusing solely on their challenges. By embracing ADHD neurodiversity, we can promote a culture of acceptance and appreciation for the unique strengths and perspectives that individuals with attention deficit hyperactivity disorder bring to the table.
Moreover, ADHD neurodiversity extends beyond cognitive differences to encompass emotional, social, and sensory experiences as well. Individuals with attention deficit hyperactivity disorder may exhibit heightened sensitivity to environmental stimuli, intense emotions, and a strong sense of empathy. By acknowledging and validating these experiences as underscored by doctors like Dr. Hanid Audish, we can create supportive environments that empower individuals with attention deficit hyperactivity disorder to navigate their world with confidence and resilience.
Challenging Stigma and Stereotypes
Despite the growing awareness of attention deficit hyperactivity disorder, misconceptions and stigma still persist, leading to negative stereotypes and discrimination against individuals with the condition. It is crucial to challenge these stereotypes and promote accurate, empathetic portrayals of attention deficit hyperactivity disorder in media, education, and public discourse. By debunking myths and misinformation surrounding attention deficit hyperactivity disorder with the help of physicians such as Dr. Hanid Audish, we can foster greater understanding and acceptance of neurodiversity in society.
Additionally, addressing stigma and stereotypes requires proactive efforts to educate individuals about the complexities of attention deficit hyperactivity disorder and the diverse experiences of those living with the condition. This may involve providing training and resources to educators, healthcare professionals, and community members to promote empathy, reduce stigma, and create inclusive spaces where individuals with attention deficit hyperactivity disorder feel valued and supported.
Supporting Academic Success
In educational settings, students with attention deficit hyperactivity disorder may face unique challenges related to attention, organization, and impulse control. However, with the right support and accommodations, they can achieve academic success and reach their full potential. Providing tailored interventions such as specialized instruction, assistive technologies, and personalized learning plans can help students with attention deficit hyperactivity disorder thrive in the classroom. By recognizing the diverse learning needs of students with attention deficit hyperactivity disorder and offering targeted support, educators can create inclusive learning environments where all students can succeed.
Furthermore, promoting self-advocacy and self-awareness among students with attention deficit hyperactivity disorder empowers them to take an active role in their education and seek out the resources and support they need to succeed. By teaching strategies for time management as assisted by doctors including Dr. Hanid Audish, organization, and emotional regulation, educators can equip students with attention deficit hyperactivity disorder with the skills and confidence to overcome obstacles and achieve their academic goals.
Nurturing Social and Emotional Well-being
In addition to academic support, it is essential to prioritize the social and emotional well-being of children and adolescents with attention deficit hyperactivity disorder. Many individuals with attention deficit hyperactivity disorder may struggle with social skills, emotional regulation, and self-esteem, making it crucial to provide opportunities for socialization, peer support, and emotional expression. By fostering a sense of belonging and acceptance in schools, families, and communities, we can help individuals with attention deficit hyperactivity disorder develop strong relationships, build resilience, and cultivate a positive sense of self.
Moreover, promoting mindfulness, self-care, and stress management techniques can help individuals with attention deficit hyperactivity disorder navigate the challenges of daily life more effectively. By teaching coping strategies and resilience-building skills, educators, parents, and physicians like Dr. Hanid Audish support the emotional well-being of children and adolescents with attention deficit hyperactivity disorder and empower them to thrive in all aspects of their lives.
Encouraging Strength-Based Approaches
Instead of focusing solely on deficits and challenges, it is essential to adopt strength-based approaches that highlight the unique talents and abilities of individuals with attention deficit hyperactivity disorder. By recognizing and nurturing their strengths, such as creativity, curiosity, and innovation, we can help individuals with attention deficit hyperactivity disorder unlock their full potential and pursue their passions with confidence and enthusiasm. Whether it's in academics, sports, arts, or other areas of interest, celebrating the strengths of individuals with attention deficit hyperactivity disorder fosters a sense of pride, motivation, and self-efficacy.
Furthermore, providing opportunities for skill development, mentorship, and leadership roles empowers individuals with attention deficit hyperactivity disorder to leverage their strengths and make meaningful contributions to their communities. By encouraging a strengths-based mindset in schools, workplaces, and social settings as emphasized by doctors such as Dr. Hanid Audish, we can create environments that value diversity, promote inclusion, and cultivate a culture of excellence where everyone can thrive.
Celebrating attention deficit hyperactivity disorder neurodiversity is essential for fostering acceptance and creating inclusive environments where individuals with attention deficit hyperactivity disorder can flourish. By embracing the diverse talents, perspectives, and experiences of individuals with ADHD, we can challenge stigma, promote understanding, and build communities that value diversity and inclusion. Through education, advocacy, and support, we can empower individuals with attention deficit hyperactivity disorder to embrace their strengths, overcome challenges, and pursue their dreams with confidence and resilience. Together, we can celebrate ADHD neurodiversity and create a world where everyone is accepted, valued, and celebrated for who they are.
| drhanidaudish | |
1,885,127 | Tips of Releasing the Magic of "Read My Essay to Me" for Developers 2024 | Discover how developers can harness the "Read My Essay to Me" text-to-speech tool to boost... | 0 | 2024-06-12T04:08:24 | https://dev.to/novita_ai/tips-of-releasing-the-magic-of-read-my-essay-to-me-for-developers-2024-2pn | readmyessaytome, texttospeech, tts, ai |
Discover how developers can harness the "Read My Essay to Me" text-to-speech tool to boost accessibility, enhance user experience, and streamline coding processes. Learn more about its benefits and integration tips.
## Key Highlights
- "Read My Essay to Me" is a state-of-the-art text-to-speech tool that seamlessly transforms text into lifelike speech in multiple languages. It features advanced customization, allowing users to fine-tune speech to their preferences.
- Easily incorporate "Read My Essay to Me" API into your projects with straightforward documentation, enhancing your application with powerful text-to-speech capabilities.
- By integrating the "Read My Essay to Me" API, developers can improve their application's accessibility, ensuring compliance with the Web Content Accessibility Guidelines (WCAG), and extending their user base to include individuals with visual impairments.
- Regularly update and optimize your application based on user feedback and performance monitoring, leveraging some AI commitment to continuous improvement and innovation in text-to-speech technology.
- From educational tools and e-learning platforms to assistive technologies and content creation applications, the "Read My Essay to Me" API can be utilized across a wide range of industries and use cases.
## Introduction
In the fast-paced world of software development, tools that enhance productivity and accessibility are invaluable. One such tool that has been gaining traction is "Read My Essay to Me," a text-to-speech (TTS) solution that converts written text into spoken words. This article explores how developers can leverage this tool to improve accessibility, boost efficiency, and deliver a better user experience.
##Understanding "Read My Essay to Me"
"Read My Essay to Me" is a robust text-to-speech tool designed to transform any typed text into clear and natural-sounding audio. With advanced voice synthesis capabilities, it offers a variety of voices and languages, making it versatile for diverse applications. The tool is especially useful for reading essays, documentation, code snippets, and more, providing an auditory representation of text that can be easily integrated into various development environments.
## Key Features and Functionalities
- Multiple Voices and Languages: Choose from a variety of voices and languages to suit different needs and preferences.
- Natural Sounding Speech: High-quality voice synthesis that sounds natural and clear.
- Customizable Settings: Adjust speed, pitch, and volume to match specific requirements.
- User-Friendly Interface: Easy to integrate and use, with straightforward API documentation.
## Benefits for Developers
### Enhanced Accessibility
Integrating "Read My Essay to Me" into your applications can significantly improve accessibility for visually impaired users. By providing auditory feedback, developers can create more inclusive applications that adhere to accessibility standards and regulations. This not only broadens your user base but also enhances the overall user experience.
There are two possible factors influencing whether your applications meet accessibility standards:
- WCAG Compliance: Ensure your applications meet the Web Content Accessibility Guidelines (WCAG), making them more inclusive and legally compliant.
- Broader User Base: Expand your user base by making your applications usable by people with visual impairments and reading disabilities.
### Improved User Experience
Incorporating TTS functionality into your applications can offer users a more dynamic and interactive experience. Whether it's providing auditory feedback in real-time applications or creating an alternative way for users to consume content, "Read My Essay to Me" can enhance user engagement and satisfaction.
### Dynamic and Interactive Applications
Applications applied with TTS can offer users real-time auditory feedback, making applications more interactive and engaging. What's more, it provides users with the option to listen to content, catering to different learning and consumption preferences.
## Integration Tips
### API Integration
Integrating the "Read My Essay to Me" API into your projects is straightforward.[ Novita AI Text to Speech API](https://novita.ai/reference/introduction.html) may be your cup of tea to make your work better. It offers swift, expressive, and reliable voice synthesis. With real-time latency under 300ms, diverse voice styles, and seamless integration, it ensures high-quality, customizable audio for enhanced podcast user experiences.
Below is a simple example of how to implement the API from [Novita AI](https://novita.ai/reference/introduction.html):
**Step 1. **Start by creating your account on [Novita AI](https://novita.ai/reference/introduction.html)'s platform to unlock access to powerful APIs.
**Step 2. **Once logged in, tap the "API" button and head to the "Audio" section, where you'll find the "Text to Speech" feature ready to be integrated into your software development project.
To utilize the TTS API, you will need to make a POST request with specific header parameters.
The request body includes a mandatory request object, which contains several parameters to customize the speech synthesis:
- **Voice ID:** Choose from a list of available voice IDs such as "Emily," "James," "Olivia," and more.
- **Language**: Select the language for the generated audio, with options like "en-US" for American English, "zh-CN" for Chinese, and "ja-JP" for Japanese.
- **Texts**: A list of UTF-8 encoded strings, each up to 512 characters long, that will be converted into speech. volume: Adjust the volume of the output audio, with a range from 1.0 to 2.0.
- **Speed**: Control the speech speed, with values ranging from 0.8 to 3.0. Optional parameters include "response_audio_type" to define the audio format (default is wav), webhook settings for callback notifications, and "enterprise_plan" configurations for users subscribed to the Enterprise Plan.
Once the request is made, the API will respond with a 200 status code and a JSON object containing the Task Id. This task Id is then used to fetch the generated audio file through the Task Result API.
An example of how to make this request using Curl is provided, demonstrating the ease with which developers can implement this feature into their applications.
Step 3. Craft an intuitive interface that allows users to effortlessly input text and adjust voice settings to their liking.
Step 4. Implement robust authentication and authorization processes to safeguard user data and maintain system integrity.
Step 5. After rigorous testing, deploy your application in a live environment. Continuously track its performance, and be ready to iterate based on analytics and user feedback.
## Custom Implementations
Developers can customize "Read My Essay to Me" to suit specific needs. Features like voice selection, speed control, and language options can be tailored to enhance functionality. This flexibility ensures that the tool can be adapted for various applications, from educational software to enterprise solutions.
### Possible Customization Options
- **Voice Selection**: Choose different voices to match the application's context or user preferences.
- **Speed and Pitch Control**: Adjust the speed and pitch of the speech to suit different listening environments and user needs.
- **Language Support**: Implement multilingual support to cater to a global audience.
## Testing and Optimization
Thorough testing is crucial to ensure the integration works seamlessly. Developers should focus on optimizing performance and accuracy, ensuring that the TTS output is clear and reliable. Regular updates and feedback loops can help refine the integration, providing the best possible user experience.
### Best Practices for Testing
- **Unit Tests**: Write unit tests to ensure each component of the TTS integration works correctly.
- **User Testing**: Gather feedback from actual users to identify and fix usability issues.
- **Performance Monitoring**: Monitor the performance of the TTS tool to ensure it meets the desired speed and accuracy.
## Provided Cases of integration of TTS
Many developers have successfully integrated "Read My Essay to Me" into their projects, witnessing significant improvements in accessibility and user engagement. Testimonials highlight how this tool has transformed their applications, making them more user-friendly and efficient.
### Real-World Examples
- **Educational Apps**: Improved accessibility for students with reading disabilities by providing auditory versions of text materials.
- **Corporate Training**: Enhanced e-learning platforms with auditory content, making it easier for employees to learn on the go.
- **Healthcare Applications**: Assisted visually impaired patients in accessing medical information audibly.
## Future Prospects
The future of text-to-speech technology is bright, with ongoing advancements promising even more natural and human-like speech synthesis. Developers can look forward to new features and improvements that will further enhance their applications and streamline their workflows.
### Emerging Trends
- **AI and Machine Learning**: Leveraging AI to create more natural and context-aware speech synthesis.
- **Emotional TTS**: Developing TTS systems that can convey emotions, improving user engagement.
- **Real-Time Processing**: Enhancements in processing speed to deliver real-time text-to-speech conversion without latency.
## Conclusion
"Read My Essay to Me" offers a powerful solution for developers looking to enhance accessibility and efficiency in their projects. By integrating this TTS tool, developers can create more inclusive, productive, and engaging applications. Explore the potential of "Read My Essay to Me" and unlock new possibilities for your development projects. Whether you're aiming to meet accessibility standards, boost productivity, or improve user experience, this tool can be a valuable addition to your development toolkit.
## Frequently Asked Questions
### What is "Read My Essay to Me"?
"Read My Essay to Me" is a text-to-speech tool that transforms any typed text into clear, natural-sounding audio, making it ideal for reading essays, documentation, code snippets, and more.
### How can developers benefit from integrating the "Read My Essay to Me" API?
Developers can enhance their applications by adding high-quality text-to-speech functionality, improving accessibility for visually impaired users, and offering an alternative way for users to consume content.
### How does the "Read My Essay to Me" API enhance user experience?
By providing high-quality, expressive audio, the API improves accessibility for visually impaired users and offers an engaging alternative for consuming content, thus enhancing the overall user experience.
_Originally published at [Novita AI](https://blogs.novita.ai/tips-of-releasing-the-magic-of-read-my-essay-to-me-for-developers-2024/?utm_source=blogs_audio&utm_medium=article&utm_campaign=read-my-essay-to-me)_
[Novita AI](https://novita.ai/?utm_source=devcommunity_audio&utm_medium=article&utm_campaign=tips-of-releasing-the-magic-of-read-my-essay-to-me-for-developers-2024), the one-stop platform for limitless creativity that gives you access to 100+ APIs. From image generation and language processing to audio enhancement and video manipulation, cheap pay-as-you-go, it frees you from GPU maintenance hassles while building your own products. Try it for free. | novita_ai |
1,885,128 | The High Ranking Social Media Company Transforming Dubai’s Digital Landscape | In the heart of the bustling metropolis of Dubai, where innovation meets tradition, one company... | 0 | 2024-06-12T04:07:42 | https://dev.to/hive_mind_1ff41438cfa282f/the-high-ranking-social-media-company-transforming-dubais-digital-landscape-5471 | dubai, webdev, beginners | In the heart of the bustling metropolis of Dubai, where innovation meets tradition, one company stands out as a beacon of excellence in the social media sphere: Hive Mind. With a reputation as a [high ranking social media company in Dubai](https://wearehivemind.com/social-media-agency-dubai/), Hive Mind has transformed the way businesses engage with their audience, leveraging the latest digital trends to create powerful online presences. This article explores Hive Mind’s journey, services, and the reasons behind its status as a top social media firm in the region.
## The Rise of Hive Mind: A Success Story
Hive Mind was founded on a vision to bridge the gap between traditional marketing approaches and the digital demands of the 21st century. From its inception, Hive Mind aimed to offer more than just basic social media management; it sought to create compelling narratives and engaging content that resonates with audiences on a deeper level.
## Key Milestones in Hive Mind’s Journey:
- 2015:
Hive Mind was established by a team of digital marketing enthusiasts with a passion for social media. Their goal was simple: to provide cutting-edge social media solutions tailored to the unique needs of businesses in Dubai.
- 2017
: Hive Mind launched its first major campaign for a luxury real estate developer, which led to a significant increase in the client’s online engagement and sales. This success catapulted Hive Mind into the spotlight as a leading social media agency.
- 2020
: Despite the global pandemic, Hive Mind expanded its services to include advanced social media analytics and virtual event promotion, helping clients navigate the new digital-first landscape.
- 2023
: Hive Mind was recognized as a top social media company in Dubai by multiple industry awards, solidifying its reputation for excellence and innovation.
## Why Hive Mind Stands Out
Several factors contribute to Hive Mind's prominence in the social media industry:
**1. Strategic Approach to Social Media Marketing**
Hive Mind takes a strategic approach to social media marketing, focusing on aligning campaigns with clients' business goals. Each campaign is tailored to meet specific objectives, whether it’s increasing brand awareness, driving traffic to a website, or boosting sales.
Market Research: Hive Mind conducts thorough market research to understand the target audience's preferences and behaviors.
Content Creation: The team develops compelling content that not only engages but also converts. This includes visually appealing graphics, engaging videos, and persuasive copy.
Analytics: Hive Mind uses advanced analytics tools to track campaign performance and optimize strategies in real-time.
**2. Innovative Use of Technology**
In an era where technology drives marketing success, Hive Mind leverages the latest tools and platforms to deliver exceptional results. From AI-driven content recommendations to automated social media scheduling, Hive Mind ensures that clients stay ahead of the curve.
AI and Machine Learning: These technologies help Hive Mind predict trends and personalize content, making campaigns more effective.
Social Listening Tools: By monitoring online conversations, Hive Mind helps clients understand what their audience is talking about and how they can join the conversation.
Augmented Reality (AR) and Virtual Reality (VR): Hive Mind uses AR and VR to create immersive social media experiences that captivate and engage users.
**3. Expertise in Dubai’s Diverse Market**
Dubai’s market is unique, characterized by a diverse population with varied preferences. Hive Mind’s deep understanding of this market allows it to craft messages that resonate with different segments.
Cultural Sensitivity: Hive Mind respects and incorporates cultural nuances into its campaigns, ensuring that the content is relevant and respectful.
Multilingual Capabilities: The team at Hive Mind can create content in multiple languages, catering to Dubai’s multilingual population.
## Services Offered by Hive Mind
Hive Mind provides a comprehensive suite of services designed to meet the diverse needs of businesses in Dubai. Here’s a closer look at what they offer:
**1. Social Media Management**
From content creation to community management, Hive Mind takes care of all aspects of social media presence. They ensure consistent branding, timely posts, and active engagement with followers.
**2. Social Media Advertising**
Hive Mind designs and manages targeted advertising campaigns on platforms like Facebook, Instagram, LinkedIn, and Twitter. These campaigns are designed to maximize ROI by reaching the right audience at the right time.
**3. Influencer Marketing**
In today’s influencer-driven world, Hive Mind connects brands with influencers who can authentically promote their products. They manage influencer relationships, campaign execution, and performance tracking.
**4. Social Media Analytics**
Understanding the impact of social media efforts is crucial. Hive Mind provides detailed analytics reports that offer insights into audience demographics, engagement rates, and campaign effectiveness.
**5. Content Creation**
Hive Mind’s creative team produces high-quality content tailored to each platform. Whether it’s captivating videos, eye-catching graphics, or compelling blog posts, they ensure the content aligns with the brand’s voice and objectives.
**6. Crisis Management**
In the fast-paced world of social media, crises can emerge quickly. Hive Mind offers crisis management services to help clients navigate negative publicity and protect their brand reputation.
## Case Studies: Success in Action
To illustrate the impact of Hive Mind’s services, consider the following case studies:
**Case Study 1: Luxury Fashion Brand**
A high-end fashion brand in Dubai sought to increase its online presence and sales. Hive Mind developed a comprehensive social media strategy that included influencer partnerships, targeted ads, and engaging content. As a result, the brand saw a 50% increase in online sales and a 200% increase in social media followers within six months.
**Case Study 2: Real Estate Developer**
A real estate developer wanted to attract international investors to a new project. Hive Mind used a combination of social media advertising, virtual tours, and engaging content to highlight the project’s benefits. The campaign reached over 1 million potential investors and led to a 30% increase in inquiries.
## The Future of Social Media with Hive Mind
As technology continues to evolve, Hive Mind remains committed to staying at the forefront of social media innovation. The company is exploring new avenues such as AI-driven customer engagement, blockchain for secure digital interactions, and advanced data analytics to deliver even more effective campaigns.
## Emerging Trends Hive Mind is Embracing:
- Social Commerce
: Integrating e-commerce with social media platforms to create seamless shopping experiences.
- Voice Search Optimization
: Adapting content for voice-activated searches as voice assistants become more prevalent.
- Interactive Content
: Developing interactive content such as polls, quizzes, and augmented reality experiences to boost engagement.
## Conclusion
In a city as dynamic and diverse as Dubai, Hive Mind has established itself as a leading social media company by combining strategic thinking, technological innovation, and a deep understanding of the local market. Their ability to deliver exceptional results for a wide range of clients has earned them a top-ranking position in the industry. As Hive Mind continues to push the boundaries of what’s possible in social media marketing, businesses in Dubai can look forward to even more innovative solutions and transformative campaigns.
Whether you’re a local startup or a multinational corporation, partnering with Hive Mind means gaining access to the cutting-edge strategies and insights that can propel your brand to new heights in the digital world. Experience the power of effective social media marketing with Hive Mind, Dubai’s premier social media agency. | hive_mind_1ff41438cfa282f |
1,883,775 | On Writing a Sane API | Over my years on the ComputerCraft Discord server, I've had the opportunity to witness the creation... | 0 | 2024-06-12T04:00:00 | https://gist.github.com/MCJack123/39ac0847579b3676cc098aca5860c758 | api, design | Over my years on the [ComputerCraft Discord server](https://discord.computercraft.cc), I've had the opportunity to witness the creation of numerous APIs/libraries of all sorts. I've gotten to examine these APIs in depth, as well as answer questions involving the APIs that the creators or users have. As an API designer myself, I compare the designs of other APIs with my designs, and I've noticed a number of patterns that make or break an API design. I've seen plenty of designs that make me go "WTF???", and lots that I just can't understand, even at my advanced level of programming (not to toot my own horn).
This article outlines some rules for making a sane API, which is easy to use, understandable, and doesn't make the user spin in circles to make things with it. Note that when I use the term "API", I'm primarily referring to code libraries and their public interfaces, but a number of points can be applied to web APIs as well. Since I have the most experience in Lua APIs, I'll be focusing on Lua APIs, but this can also be applied to any other language.
## Keep It Consistent
Consistency is key in any sane API design. By keeping things the same across the entire API, you reduce the number of surprises the developer will find when they try to use it. This applies for *every part of the API*, including, but not limited to:
* Name formatting (including case, general length, and word choice)
* Types of arguments and return values (don't use numbers for some functions, and string-numbers for others)
* Order of arguments (if you put X/Y as the 2nd/3rd argument in one function, do that in all functions)
* Property names (don't have one type use `width`/`height` and another use `w`/`h`)
* Error message format (use similar word choice and placement for all errors)
* Division of submodules (don't place some similar functions in one submodule, but others in the root)
Before writing the API, decide on some standards that you'll follow throughout the API. Then follow this standard in every public interface you write, and don't deviate from the standard unless absolutely required (e.g. you also implement functions for a different API than yours). Having the standard written down somewhere can be useful not only for yourself, but also for the developer. Even better, develop standards that you'll use in *all* your APIs. For example, I usually use names that are as few words as possible while still getting the idea across, with camelCase to separate words. If you have a personal standard, people who know how to use one API of yours won't have much trouble using another.
## Make It Concise
There's no need to make your function/variable names overly descriptive. The documentation is where you can be highly descriptive about the function, but the names should be just long enough to describe what they do. A function or property should ideally be no more than four words long; a type name should ideally have no more than six words. Instead of calling your function `drawBoxOnScreenWithSizeAndColor(x, y, w, h, c)`, use `drawBox(x, y, width, height, color)` - most IDEs will display the parameter names when typing or hovering over the function, making it unnecessary to describe the parameters in the type name. (Note that this does not necessarily apply to Objective-C, which typically uses descriptive message and parameter label names.) Using shorter names will make your code easier to read and look at, and also makes it easier to type, especially if the developer's working in an editor without autocomplete.
In addition, keep the number of arguments to functions as low as possible. Don't give your functions 13 optional arguments just to make it possible to construct an object in one call, or to specify different options in the process. If you're making a constructor, only use arguments that are absolutely required to create the object, and have the developer set properties or call setter methods for any additional options. For single-call functions that have a lot of options, consider having the developer pass a table/dictionary/object of options instead of positional arguments. This has the benefit of explicitly defining which arguments correspond to which option, and allows complete omission of any default arguments, as well as not requiring the developer to remember the order of arguments. Python has the ability to use named arguments, so prefer using named arguments when there are a large number of options. Lua even has shorthand for passing a single table argument, allowing named calls with a similar syntax to Python:
```lua
local function lotsOfArguments(options)
if options.test then
print(options.myArgument)
end
-- etc.
end
lotsOfArguments{test = true, myArgument = "Hello World!"}
```
Finally, instead of having large metafunctions that do everything, consider providing individual functions that just do one thing. This allows developers to combine your functions as they need without having to follow the same mindset you may have while writing the API. A function should have one concise purpose, and no more - if more is needed, the developer can combine functions to make it.
## Maintain Modularity
In many languages, importable libraries are called *modules*. This is because the libraries are made to be *modular*, and able to be loaded and unloaded cleanly as one unit. When writing a library (especially in module-based languages), you should maintain this idea of modularity. The biggest rule to follow is to use as little global state as possible, *especially environment-level globals*. This means that you should not use *any* global or module-level variables to store state about the API. Instead, opt to use handles or state objects to store all state. **Do not store things in the global environment of the caller (Lua `_ENV`, JS `window`, etc.). This can lead to *very bad* things happening when the "module" (it is no longer modular) is reloaded, plus possible conflicts with other "module"s.** By not using global variables, you reduce the number of surprises that may happen due to [*side effects*](https://en.wikipedia.org/wiki/Side_effect_(computer_science)) of function calls. This is especially important if you intend to allow the developer to use multiple copies of some object (e.g. Lua 5 allowing multiple parallel states (VM instances) in the same program), or you want to make your library multithreading-capable (global state leads to race conditions).
Another good way to modularize your code (as well as just general code cleanliness & organization) is to split similar functions into a submodule. This can be a separate file that you have to load manually (good for large/complex submodules), or just a simple namespace or table inside the main module (good for single-file modules). One example of this is in my AUKit library: I have the root `aukit` module store the loader functions + miscellaneous functions; an `aukit.effects` submodule (in the same file) holds functions that modify loaded audio in-place; and an `aukit.stream` submodule provides a number of streaming functions that all return a loader callback for use in `aukit.play()`. This goes along with the natural human tendency to categorize similar things, and will help the API make more sense, as well as keeping your code naturally organized.
## Be Fool-Resistant
When writing libraries, I find that a lot of people tend to make their APIs understandable *for them*. This is okay if you're just making it for yourself, but it can become a problem when you want other people to start using the library. Just because you know what something means doesn't mean that everyone else who uses your API will know what it means too. A sane API should be clear to anyone with a base-level knowledge of the purpose of the library; e.g. an audio manipulation library should be clear to someone with a base level of audio editing. In addition, assume that they will do everything *wrong* - this helps avoid creating unintelligible errors and catastrophic failures when someone *does* do something wrong.
When you write functions that are public-facing, act like the user is a monkey with a typewriter, who only knows how to press keys to make things work. In reality, a lot of newer programmers are like this in a way, copying code they find online to make things work. This is good for learning, but once the programmer starts adjusting things to fit their needs better, they often make mistakes that even a high-level programmer wouldn't expect. Again, **this is fine for the learner**, but it is not good for *your* code. At the very least, check all inputs your code takes, especially in a dynamically typed language like Lua or JavaScript. Never assume the inputs are correct - in fact, assume the inputs are wrong in every single way possible before you start operating on it. This also gives the developer an opportunity to get an error message that actually describes what's wrong - getting an error of `program.lua:15: bad argument #1 to 'loadFile' (expected string, got number)` is much more understandable to the developer than `api.lua:893: attempt to index a number value`. You should always prefer to bail cleanly if something goes wrong - be ready for things to fail, and handle them as gracefully as possible with as descriptive of errors as possible (even if this means triggering a panic - just make sure there are no side-effects).
In addition, no matter how good your documentation is, you should assume that the user did *not* read it. Many times, people will jump into writing code just using autocompletion, rather than looking at the actual documentation of the functions (myself included). This doesn't make it okay to write crappy docs (more on this below), but you should make your API at least decently navigable without reading the docs. This not only helps the lazy be lazy, but it also contributes to keeping the code clean, as it forces you to write more understandable names as described above. The functions should be able to describe the docs nearly as well as the docs describe the function - this means that there should be no surprises when reading the docs for a function by name.
## Write Good Documentation
The key to getting people to use your code is to document *everything* well. If it is not documented, or the docs are hard to read, people will avoid your code even if it is the best choice available. It's hard to use code if you don't know how to use it, and this gets worse as the complexity of the library (and thus the likelihood that a library is better than implementing your own) increases. A sane API extends beyond just having clean code - they also have clean documentation to help the developer as much as possible.
The first part in writing good docs is to describe everything properly. Proper function docs should contain:
1. A brief, one-line overview of the function
2. Further description of the function, including any special notes (if necessary)
3. Descriptions of each argument's purpose with types
4. An explanation of the return value
5. Examples of how to use the function (if desired, recommended if the function's complex)
6. Links to any related functions
This procedure should be followed for **every** public function in your API. Failure to document a function will result in decreased usage of that function. All documentation should be written in proper grammatically-correct English (or whatever language you choose - English is pretty standard, as is Chinese) as much as possible - use tools like [Grammarly](https://www.grammarly.com/) to check your docs for proper grammar (you may ignore warnings about using programming words). Native English speakers may find poor grammar in documentation to indicate poor code quality as well, even though a large number of developers speak English as a second language, so ensuring your docs are written well will help native speakers understand it better. Also, be specific about what you're writing about - try not to use pronouns (that, it, etc.) unless it negatively affects readability.
It's also a good idea to include module-level documentation to describe the API as a whole. This is where you write a multi-paragraph description of what it is, how it works, potential use cases, and full-formed examples of how to use the API. These help describe the API as a whole, and gives some more insight into usage beyond single functions. You can also declare the license statement here, as well as author and version.
To assist in writing documentation, I recommend you use a documentation generator such as Javadoc, Doxygen or LDoc. These tools allow you to type your docs directly in the code using comments. This means you don't have to jump to a different file or workspace to document your work, and you can keep everything in one file. This also allows people to read the docs directly in their code editor - in fact, many IDEs include automatic parsing of select doc syntaxes, showing the descriptions in the editor while writing code. Finally, the tool will automatically handle all styling of the resulting web page for you, so you don't need to manage styling or links at all (unless you want to make it look better - standard styles are typically very basic, but usable). To generate a webpage version, all you need to do is (in some tools) create a default config file and pass in the source file(s) you want to generate for, and it'll spit out HTML and CSS with the documentation extracted and formatted, suitable for uploading to places like GitHub Pages.
Writing documentation won't be helpful unless there's a place where developers can easily access it. If you have comment docs, this is a great first step, but it's also helpful to be able to bring up just the docs separately from the code (especially if the source is long). The easiest way to do this is to generate the docs as stated above, upload the docs in a `/docs` folder in a GitHub repo (preferably the same one with the code), and enable GitHub Pages on the repo (in Settings => Pages, then choose the source branch and path). This will make the docs automatically available at `https://your-username.github.io/your-repository/`. Once you do this, add a link to the docs to `README.md` (you have one, right?) and the repo URL field so it's easy to find them. (Note that making docs available as a webpage isn't strictly required - especially if you use Gists/single-file distribution methods - but it's a very helpful resource when deep in using the API.)
### An Example
My favorite example of what I consider a sane API is my [AUKit](https://github.com/MCJack123/AUKit/) library (which I've referenced before). I used all of the concepts I've described when designing it:
* I kept the functions consistent: all names are single words, all `Audio` methods return new values while all `aukit.effects` functions modify in-place
* I kept it as terse as possible while still making sense: the single-word function names describe what they do, functions (mostly) do exactly one thing (and I should probably adjust a few functions to take named arguments as well)
* I made it modular: functions with similar purposes are stored in separate subtables, no globals are used besides a `defaultInterpolation` value in the module table (which can be overridden locally), functions do not produce side effects
* I made it fool-resistant: all arguments are checked before use, malformed files trigger a readable error
* I wrote good documentation: all functions, methods and fields are fully documented both in inline comments as well as [online through GitHub Pages](https://mcjack123.github.io/AUKit/)
If you want to see how to follow this guide, you may examine AUKit's code and documentation page - I recommend it as a template of how good APIs look. Of course, this is my own project, so I can't give a perspective from someone else's view, but I'm personally quite proud of it.
## Conclusion
Sane APIs are pretty much a necessity if you want to make a successful library. Consistency and conciseness is key when writing a public interface - not following these will cause confusion, making people turn away. Keeping the module modular means your library is easy to simply snap into a program without worrying about conflicts, as well as keeping your own code structure clean. Protecting your code from foolish inputs will make sure that you don't inadvertently cause catastrophe, and that the developer can get helpful feedback on their errors. Finally, writing good documentation for your code is one of the most important things when releasing the API for use by other developers. By following these guidelines, you'll be able to make a public interface for your code that people can look at and think, "That is a very sane API." | jackmacwindows |
1,885,126 | Introducing LaravelCart: A Streamlined Shopping Cart Solution for Laravel Developers | Do you find managing shopping carts in your Laravel applications cumbersome? Look no further than... | 0 | 2024-06-12T03:54:48 | https://dev.to/abiruzzamanmolla/introducing-laravelcart-a-streamlined-shopping-cart-solution-for-laravel-developers-287a | laravel, laravelcart, laravelshoppingcart, laravel11 | ---
title: Introducing LaravelCart: A Streamlined Shopping Cart Solution for Laravel Developers
published: true
description:
tags: laravel, laravelcart, laravelshoppingcart, laravel11
# cover_image: 
# Use a ratio of 100:42 for best results.
# published_at: 2024-06-12 03:48 +0000
---
Do you find managing shopping carts in your Laravel applications cumbersome? Look no further than LaravelCart, a lightweight and efficient package designed to simplify the shopping cart experience for both you and your users.
#### Effortless Cart Management:
Seamless Integration: LaravelCart integrates seamlessly with Laravel 7, 8, 9, 10, and 11, requiring minimal configuration to get started.
Intuitive API: The package offers a straightforward API with methods for adding, updating, removing, and retrieving cart items, making it easy to manage your shopping cart logic.
Multiple Cart Instances: Manage multiple carts simultaneously, allowing you to create separate carts for wishlists, shopping lists, or different user types.
Database Storage (Optional): Persist your carts in the database for a seamless user experience across sessions, allowing users to resume their shopping journey later.
#### Key Features:
**Item Management:** Add, update, remove, and retrieve cart items with ease.
**Quantity Control:** Manage item quantities within the cart.
**Cost Calculation:** Calculate subtotal, tax, and total costs for your cart.
**Model Association:** Associate your cart items with Laravel models for easy data retrieval.
**Cost Management:** Add additional costs like transactions or shipping fees to your cart.
**Customizable Formatting:** Format cart totals and costs according to your preferences.
#### Boost Your Development Workflow:
By leveraging **LaravelCart**, you can significantly reduce the development time and effort associated with building shopping cart functionalities in your Laravel applications. The package's clean codebase and well-documented API ensure a smooth development experience.
#### Getting Started:
Install LaravelCart via Composer:
Bash
`composer require azmolla/laravelcart`
For detailed usage instructions and code examples, refer to the comprehensive documentation available on the package's Packagist page: [azmolla/laravelcart - Packagist](https://packagist.org/packages/azmolla/laravelcart)
#### Join the Community:
We encourage you to contribute to the LaravelCart project by raising issues, suggesting improvements, or creating pull requests.
Let LaravelCart streamline your Laravel shopping cart development and provide a delightful user experience for your customers!
> Note: This package is based on gloudemans/shoppingcart - Packagist | abiruzzamanmolla |
1,885,124 | API Architecture Styles: Sockets | API architecture is fundamental to modern application development, enabling efficient communication... | 0 | 2024-06-12T03:49:30 | https://dev.to/team3/api-architecture-styles-sockets-4pip | API architecture is fundamental to modern application development, enabling efficient communication between different systems. One architecture style particularly useful for real-time communication is the use of sockets. This article provides a comprehensive introduction to sockets, how they work, their practical applications and a code example.
**What are Sockets?**
A socket is like a digital plug that allows two different computer programs to communicate with each other over a network. Sockets are like a telephone line that connects two people, allowing them to talk and listen at the same time. Using sockets, applications can send and receive data in real time. Sockets can use different protocols, such as TCP for a secure and reliable connection, or UDP for faster but less secure communication.
**How Sockets Work**
To understand how sockets work, let's consider a simple analogy: a telephone conversation between two people.
1. Opening the Connection:
_Client and Server:_ In the context of sockets, one program acts as a server (waiting for incoming connections) and another as a client (initiating the connection).
_IP Address and Port:_ To establish a connection, the client needs to know the IP address of the server and the port on which the server is listening.
2. Connection Establishment:
_TCP:_ Uses a three-way handshake process to ensure a reliable connection.
_UDP:_ Does not require a handshake and is ideal for applications that need to transmit data quickly without concern for reliability (e.g., live video streams).
3. Data Exchange:
_Bidirectional:_ Once the connection is established, both ends can send and receive data simultaneously, as in a telephone conversation where both people can talk and listen at the same time.
4. Closing the Connection:
_Termination:_ At the end of the communication, both ends close the connection to free up resources.
**Basic Example of Sockets in Python**
To illustrate how sockets work, here is a simple example of a server and a client in Python.
Server (server.py):
>```python
import socket
#Create a TCP/IP socket
server_socket = socket.socket()
server_socket.bind(('localhost', 9999))
server_socket.listen(1)
#
print("Esperando conexión...")
connection, address = server_socket.accept()
print("Conexión establecida desde:", address)
#We receive customer data
data = connection.recv(1024)
print("Mensaje recibido:", data.decode())
#We send a response to the customer
connection.sendall(data)
#We close the connection
connection.close()
```
Cliente (client.py):
>```python
#Create a TCP/IP socket
client_socket = socket.socket()
client_socket.connect(('localhost', 9999))
#We send a message to the servermessage = "Hola, soy el cliente"
client_socket.sendall(message.encode())
#We received the response from the server
data = client_socket.recv(1024)
print("Respuesta del servidor:", data.decode())
#We close the connection
client_socket.close()
```
This example shows how a client connects to a server, sends a message and receives a response. The server listens for incoming connections, receives data and responds with the same data.
**Practical Applications of Sockets**
Live Chats:
Example: applications such as WhatsApp and Telegram use sockets to send and receive messages instantaneously. Each message sent is translated into data that travels through a socket to the recipient in real time.
Online Games:
Example: Multiplayer games like Fortnite and Call of Duty rely on sockets to synchronize player actions in real time, providing a fluid and responsive gaming experience.
Sockets are an essential technology for real-time communication in a variety of modern applications. From live chats to online games and live video streams, sockets enable seamless and continuous interaction between clients and servers. Although they can be complex to implement, the benefits they offer in terms of speed and bidirectionality make them indispensable in the development of real-time and interactive applications. | team3 | |
1,885,123 | 北川源太郎（KITAGAWA GENTAROU）：金融界のレジェンドアナリスト | 北川 源太郎 KITAGAWA GENTAROU 出生地: 東京都 学歴:： 学生時代から数字と金融に興味があり、東京大学で金融学を学び卒業しました。有名な投資銀行に入社し、金融アナリストとして... | 0 | 2024-06-12T03:48:45 | https://dev.to/kitagawag/bei-chuan-yuan-tai-lang-kitagawa-gentaroujin-rong-jie-noreziendoanarisuto-494o | 北川 源太郎 KITAGAWA GENTAROU
出生地: 東京都
学歴:：
学生時代から数字と金融に興味があり、東京大学で金融学を学び卒業しました。有名な投資銀行に入社し、金融アナリストとして 20 年以上のキャリアをスタートさせました。
簡単な経歴:：
シニア金融アナリストとして、豊富な投資経験と専門知識を持ち、さまざまな財務分析手法に精通しており、多くの金融商品と市場動向をよく理解しています。
2008年、リーマンショックが私の家族とキャリアに深刻な影響を与えました。私は親戚や友人の紹介で山口秀久さんと出会いました。
彼は私の人生の方向性を再定義し、卓越した個人的な洞察力と予測能力、そして豊富な実務経験によって再び高い成果を上げることが出来ました。その後、山口秀久氏の会社に入社し、パートナーとなる。
過去 20 年間にわたり、私はさまざまな国で働き、生活してきましたが、さまざまな文化やビジネス環境を深く理解しており、これまでに数多くの複雑な投資プロジェクトや取引に参加し、貴重な実務経験を積み上げてきました。見識がさらに広がったことで、複雑な国境を越えた投資プロジェクトを処理できるようになり、業界で高い評価を得ています。さまざまな投資リスクを回避できるように、多くの投資に対して高利回りの投資戦略を策定します。同時に、専門的な財務分析と投資アドバイスも提供します。
実績:：
20 年以上にわたり、絶え間なく変化する金融市場において、鋭い洞察力と将来を見据えた思考を維持し、市場動向を正確に把握し、潜在的な投資リスクと機会を洞察し、現実的な投資戦略を策定することができます。
ギャン理論などのテクニカル分析で多大な功績を残しており、チャート分析の第一人者として、個人投資家向けの投資教育活動にも積極的に取り組んでおり、これまでに受講者数は数千人を超えている。投資コミュニティで圧倒的な人気を誇っています。代表的な手法としては「移動平均大サイクル分析」「大サイクルMACD」「大サイクル確率指標」などが挙げられます。
概要:：
1996 年にペンシルバニア大学を卒業、金融の修士号を取得しました。
1999年に経済学博士号を取得後、フィデリティ社経済調査部に入社し、制度調査室に配属。
経済調査部主に東アジアの経済調査、経済構造分析等を担当
2003 年にフィデリティ ファンド投資部に投資アナリストとして異動し、ファンド プロジェクトの開発、株式市場の分析と調査を担当し、顧客に合わせた多様な投資戦略の策定に注力しました。
2009年にフィデリティ・インターナショナルの日本事業のファンドマネージャーに就任。また、FIL インベストメンツ (ジャパン) リミテッドの資産運用事業責任者および FIL 証券株式会社の責任者でもあり、日本の個人投資家に投資商品とサービスを提供しています。
2014年ベインキャピタルは株式会社プライベートエクイティ投資部入社
2019年よりプライベートエクイティファンド販売プロジェクトマネージャーを務める。
投資の基本
株式:：
会社の資本を表し、リスクとリターンが高くなります。
債券：
リスクは低いがリターンが比較的低い債券
ファンド：
投資リスクを分散するための株式ファンド、債券ファンドなど
その他の資産: 不動産、金などの物理的な資産。
投資目標の設定：
個人のリスク許容度、投資期間等に応じて投資目標を決定
価値の維持と価値の向上、定期的な収入、資本の増加などのさまざまな目標。
投資原則を学ぶ: 分散: すべての卵を 1つのカゴに入れないこと。
通常枠：
平均コスト、変動リスクを軽減
長期投資: 忍耐と合理性を保ち、長期的なチャンスを掴みます。
資産配分の概念:：
株式、債券、現金などのさまざまな種類の資産のウェイト配分など、リスクと目標リターンに基づいて、さまざまな種類の資産の投資割合を合理的に割り当てます。
配分方法に関する説明：
リスクと目標リターンのバランスをとり、資産配分を定期的に調整し、市場の変化に適応し、経済状況と市場動向に細心の注意を払い、変化に応じて適時に資産配分を調整する。
ポートフォリオの分散:：
複数の資産タイプを含む投資ポートフォリオを構築し、単一資産のリスクを軽減し、ETF やインデックス ファンドなどの投資ツールの特性を理解します。
さまざまなツールを適切に活用してポートフォリオを構築し、定期的な投資では忍耐と規律を保ち、長期的な経済成長から生まれる投資機会を捉え、経済情勢や市場動向に細心の注意を払い、変化に応じて投資ポートフォリオを柔軟に調整します。 | kitagawag | |
1,883,906 | Building a Fort Knox DevSecOps: Comprehensive Security Practices | _Welcome Aboard Week 2 of DevSecOps in 5: Your Ticket to Secure Development Superpowers! Hey there,... | 27,560 | 2024-06-12T03:48:00 | https://dev.to/gauri1504/building-a-fort-knox-devsecops-comprehensive-security-practices-3h7m | devsecops, devops, cloud, security | _Welcome Aboard Week 2 of DevSecOps in 5: Your Ticket to Secure Development Superpowers!
Hey there, security champions and coding warriors!
Are you itching to level up your DevSecOps game and become an architect of rock-solid software? Well, you've landed in the right place! This 5-week blog series is your fast track to mastering secure development and deployment.
Get ready to ditch the development drama and build unshakeable confidence in your security practices. We're in this together, so buckle up, and let's embark on this epic journey!_
---
In the age of digital transformation, applications are the crown jewels of any organization. Securing these applications is no longer a luxury; it's a necessity. Traditional security bolted on at the end of development is akin to building a castle after the war has begun. DevSecOps, the philosophy of integrating security throughout the development lifecycle, offers a more proactive approach, transforming your development process into an impenetrable fortress. This blog delves deep into the essential security practices that form the bedrock of a robust DevSecOps environment.
## Fortifying the Codebase: Secure Coding Practices
The code itself is the foundation of your digital fortress. Secure coding practices are the cornerstones that ensure this foundation is built to withstand attack.
#### Confronting Common Vulnerabilities:
Imagine a well-stocked armory preparing for battle. The OWASP Top 25 list (https://owasp.org/www-project-top-ten/) acts as your security arsenal, identifying the most prevalent software vulnerabilities. Equipping developers with a deep understanding of these vulnerabilities empowers them to write code that mitigates them from the get-go.
#### Static Application Security Testing (SAST):
Envision automated guards constantly patrolling your castle walls. SAST tools seamlessly integrate into the CI/CD pipeline, acting as your first line of defense. These tools scan code for vulnerabilities early and often, identifying potential weaknesses before they become exploitable chinks in your armor.
#### Following the Standard:
Just as knights adhere to a code of chivalry, developers should follow established secure coding standards. These standards, like the OWASP Secure Coding Practices (https://owasp.org/www-project-secure-coding-practices-quick-reference-guide/), provide language-specific guidelines that act as a knight's manual for secure coding. By adhering to these guidelines, developers write code that is inherently resistant to attack.
Example: In Python, a common vulnerability is SQL injection, where malicious code disguised as user input can wreak havoc on your database. Following secure coding practices like using parameterized queries ensures user input is treated as data, not code, effectively preventing such attacks.
## Shifting Left: Moving Security Up the Front Lines
Traditional security approaches treat security as an afterthought, a metaphorical portcullis lowered only after attackers have breached the outer walls. DevSecOps flips this script with "Shift-Left Security," weaving security considerations into every stage of development, from design to deployment.
#### From Reactive to Proactive:
Imagine a traditional security approach as firefighters arriving after a blaze has engulfed the castle. Shift-Left Security embodies the proactive approach of the fire marshal, preventing the fire from starting in the first place. By integrating security considerations throughout development, vulnerabilities are identified and addressed early on, significantly reducing the risk of exploitation.
#### Quantifiable Benefits:
Shift-Left Security isn't just about philosophy; it delivers tangible results. Fewer vulnerabilities make it to production, leading to faster incident response, reduced downtime, and a stronger overall security posture. Studies have shown that DevSecOps practices can reduce security vulnerabilities by up to 70% (https://about.gitlab.com/blog/2020/06/23/efficient-devsecops-nine-tips-shift-left/), significantly lowering the risk of costly data breaches.
#### Techniques for Shifting Left:
Several techniques fuel the Shift-Left approach. Threat modeling, conducted early in the development process, identifies potential security threats before a single line of code is written. Secure code reviews by peers with security expertise catch vulnerabilities before code is merged into the main branch. Early vulnerability scanning with SAST tools ensures issues are addressed before deployment, preventing them from becoming exploitable weaknesses.
## Taming the Third-Party Threat: Securing Dependencies
The software supply chain is a complex ecosystem. Third-party libraries and frameworks are essential for rapid development, but they can also introduce security risks if not managed properly. Imagine a Trojan Horse disguised as a gift entering your castle gates.
#### Supply Chain Attacks:
Supply chain attacks exploit vulnerabilities in third-party dependencies to gain access to your systems. The 2020 SolarWinds attack serves as a stark reminder of this threat. By understanding the potential dangers lurking within third-party dependencies, you can take steps to mitigate them.
#### Dependency Management Tools:
Think of these tools as vigilant guards inspecting incoming supplies. Dependency management tools like Snyk or Renovate identify vulnerabilities in third-party libraries used in your project. This allows developers to address these vulnerabilities by updating dependencies to patched versions or finding secure alternatives. By keeping your dependencies up-to-date and free from vulnerabilities, you significantly reduce the attack surface of your applications.
#### Open-Source Security :
Best Practices for Open-Source Usage: Treat open-source libraries with the same scrutiny you would give any incoming visitor to your castle. Here are some best practices to ensure secure use of open-source software:
#### License Compliance:
Ensure you comply with the license terms of the open-source libraries you use. Violating these licenses can have legal ramifications.
Vulnerability Management: Actively manage vulnerabilities in chosen libraries. Stay updated on known vulnerabilities and update dependencies or find secure alternatives when necessary.
#### Security Reviews:
When possible, conduct security reviews of critical open-source libraries before integrating them into your project. This helps identify potential security risks before they become a problem.
## Expanding the Security Toolkit
#### Secure Configuration Management:
Imagine a well-fortified castle rendered vulnerable by weak points in its foundation. Infrastructure as Code (IaC) tools like Terraform or Ansible automate infrastructure provisioning. However, if not secured properly, IaC misconfigurations can create security holes. Following security best practices when writing IaC ensures consistent and secure infrastructure configurations, eliminating these potential weak points in your defenses.
#### Security Automation:
Efficiency is key in any well-run castle. Security automation involves automating security tasks throughout the development lifecycle. This could involve automated vulnerability scanning, security compliance checks, or automated incident response workflows. Security automation reduces human error and frees up security professionals to focus on more strategic tasks, allowing them to act as commanders coordinating the overall security defense strategy.
#### DevSecOps Culture and Training:
Building a DevSecOps culture is akin to fostering a spirit of vigilance among your castle guards. When security is a shared responsibility, everyone is invested in building and maintaining secure applications. Training developers on secure coding practices and establishing security champions who promote security awareness within teams are crucial aspects of this culture. Security champions act as internal security advisors, helping developers identify and address security risks in their code.
## Advanced Secure Coding Practices: Refining the Craft
Secure coding goes beyond basic practices. Here are some advanced techniques to consider, further strengthening the defensive capabilities of your code:
#### Input Validation and Sanitization:
Just as a castle gatekeeper scrutinizes visitors, input validation ensures only legitimate data enters your application. Techniques like whitelisting and data type checks prevent malicious code injection attacks like SQL injection and XSS. Sanitization involves removing potentially harmful characters from user input before processing. By implementing these techniques, you effectively prevent attackers from exploiting vulnerabilities hidden within your code.
#### Secure Coding for Specific Languages:
Different programming languages have unique vulnerabilities. For instance, Java developers should be aware of buffer overflows and insecure direct object references, while Python developers need to guard against integer overflows. Understanding these language-specific vulnerabilities allows developers to write code that is inherently more secure, reducing the likelihood of exploitable weaknesses.
#### Secure Coding Libraries and Frameworks:
Imagine pre-built fortifications readily available to bolster your castle's defenses. Secure coding libraries and frameworks provide pre-built functionalities with security in mind. For example, the Django web framework in Python includes built-in mechanisms to prevent SQL injection. Utilizing these libraries reduces the risk of developers inadvertently introducing vulnerabilities into their code, saving them time and effort while enhancing the overall security posture of the application.
Example: JavaScript developers can leverage the DOMPurify library to sanitize user input before it's rendered in the browser, preventing XSS attacks that could steal user data or hijack sessions.
## Shift-Left Security in Action: Fortifying the Development Process
Shift-Left Security isn't just a concept; it's a philosophy put into action. Here are some techniques to operationalize it, further strengthening your development process and reducing the attack surface of your applications:
#### Threat Modeling:
Imagine a war council strategizing potential enemy attacks. Threat modeling involves brainstorming potential security threats early in the development process. By proactively identifying these threats, developers can build security controls into the application from the ground up, ensuring that vulnerabilities are not introduced later in the development lifecycle. This significantly reduces the time and resources required to address security issues.
#### Security Champions:
Security champions are like knights within the development team, constantly vigilant and promoting secure coding practices. They can identify security risks in code reviews, participate in threat modeling sessions, and stay updated on the latest security threats. By having security champions embedded within development teams, security awareness becomes an integral part of the development process.
#### Integration with Bug Bounty Programs:
Bug bounty programs are like ethical hackers invited to test your castle's defenses. Integrating with bug bounty programs allows external security researchers to identify vulnerabilities before they are exploited by malicious actors. This can be a powerful way to discover and fix vulnerabilities early in the development lifecycle, before they become a critical security risk. By offering incentives for finding vulnerabilities, bug bounty programs leverage the expertise of a wider security community to identify and address potential weaknesses in your applications.
## Security Considerations for APIs: Guarding the Gates
APIs are the modern-day castle gates, controlling access to your applications and data. Here's how to secure them:
#### API Security Standards:
Just like international trade follows established protocols, APIs should adhere to security standards. The OWASP API Security Top 10 (https://owasp.org/www-project-api-security/) outlines these standards, including best practices for authentication, authorization, and data encryption. Following these standards ensures that only authorized users can access your APIs and that sensitive data is protected during transmission.
#### API Authentication and Authorization:
Imagine a layered security system at your castle gate – one for identification (authentication) and another for permission (authorization). API authentication verifies the identity of users or applications calling the API. Common methods include OAuth and API keys. API authorization determines what level of access these users or applications have to API resources. Role-based access control ensures that only authorized users can access sensitive data or perform specific actions within your application. By implementing robust authentication and authorization mechanisms, you restrict unauthorized access to your APIs and the data they control.
#### API Gateway Security:
An API gateway acts like a central checkpoint for all API traffic. It enforces security policies like rate limiting, throttling, and access control. Rate limiting prevents denial-of-service attacks by restricting the number of API requests a user or application can make within a given timeframe. Throttling slows down excessive API requests to prevent overloading your systems. Access control ensures that only authorized users and applications can access specific API endpoints. By implementing these security measures at the API gateway level, you can significantly reduce the risk of attacks that target your APIs.
## Emerging Security Trends in DevSecOps: Keeping Your Defenses Up-to-Date
The DevSecOps landscape is constantly evolving. Here are some emerging trends to keep your security posture strong, ensuring your fortress remains impregnable:
#### Security in Infrastructure as Code (IaC):
As IaC adoption grows, so does the need to secure IaC configurations. This involves using tools that detect and prevent security misconfigurations in IaC templates. For example, tools like CloudSploit can scan IaC templates for insecure resource configurations, identifying potential vulnerabilities before they are deployed to production. By securing your IaC configurations, you ensure that your infrastructure is provisioned securely from the ground up.
#### Security in Cloud-Native Environments:
Cloud-native environments introduce unique security considerations. Containerized applications and serverless functions require specific security measures. Container security tools like Aqua or Anchore can help secure container images and runtime environments. For serverless functions, focusing on IAM roles and permissions is crucial. By understanding and addressing the specific security challenges of cloud-native environments, you can ensure the security of your applications throughout their lifecycle.
#### DevSecOps and Security Orchestration and Automation Response (SOAR):
Imagine having a central command center coordinating your castle's defenses. SOAR platforms integrate with DevSecOps pipelines to automate security incident response. When a security event is triggered, SOAR can automate tasks like threat analysis, incident containment, and remediation. This frees up security professionals to focus on more complex tasks and ensures a faster and more efficient response to security incidents.
---
## Conclusion :
By implementing these comprehensive security practices, you can build a robust DevSecOps foundation, transforming your development process into an impenetrable fortress. Remember, security is an ongoing process, not a one-time fix. Staying informed about the latest threats and continuously improving your security posture is essential in today's ever-evolving digital landscape.
---
I'm grateful for the opportunity to delve into Building a Fort Knox DevSecOps: Comprehensive Security Practices with you today. It's a fascinating area with so much potential to improve the security landscape.
Thanks for joining me on this exploration of Building a Fort Knox DevSecOps: Comprehensive Security Practices. Your continued interest and engagement fuel this journey!
If you found this discussion on Building a Fort Knox DevSecOps: Comprehensive Security Practices helpful, consider sharing it with your network! Knowledge is power, especially when it comes to security.
Let's keep the conversation going! Share your thoughts, questions, or experiences Building a Fort Knox DevSecOps: Comprehensive Security Practices in the comments below.
Eager to learn more about DevSecOps best practices? Stay tuned for the next post!
By working together and adopting secure development practices, we can build a more resilient and trustworthy software ecosystem.
Remember, the journey to secure development is a continuous learning process. Here's to continuous improvement!🥂
| gauri1504 |
1,863,266 | The radical concept of NixOS and why I love it! | NixOS is one of the most exciting developments in the Linux community in recent years. It is an... | 0 | 2024-06-12T03:47:35 | https://dev.to/prismlabsdev/the-radical-concept-of-nixos-and-why-i-love-it-cfk | linux, learning, nixos | NixOS is one of the most exciting developments in the Linux community in recent years. It is an independently developed Linux distribution based on the Nix package manger. It expands the concept of declarative and reproducible builds found in the Nix package manager to the entire system! Bringing unmatched stability to your system and finally put an end to the age old "Well it works on my system!".
## The Nix Package Manager
Like many other distributions, the core of NixOS is it's package manager, which goes by the same name. It should be noted that you can use the Nix package manager with any distribution and is not limited to just NixOS. However it is far easier to use the Nix package manager with NixOS.
The Nix package manager takes a unique declarative approach to package management. By using this approach it allows nix to do a few really cool things including atomic updates and rollbacks.
Rather than running install commands like you would with other package managers like apt and pacman you declare all packages in your `configuration.nix` file. Then run an upgrade process.
When running the upgrade process Nix stores all packages in the `/nix/store` directory and symbolically links them to the rest of the system to the destination you would expect them to be. This allows you to have multiple versions or variants of a package installed at the same time without conflict. This is also the key to the rollback system.
All nix package manager operations are atomic and never overwrite data in the `/nix/store`. This allows you to rollback to any of your previous builds in the event of a failing update.
### Available packages
A side note about the Nix package manager that cannot be ignore is the massive amount of fresh packages found in the repository.
According to [Repology](https://repology.org/repositories/graphs) Nix package managers latest stable branch (24.05) has more **fresh** packages than any other package repo around. In fact about twice as many fresh packages as found in both the Arch repo and AUR combined!
## NixOS declarative system configuration
The biggest advantage of using NixOS, aside from offering the best support for the Nix package manager, is the declarative system configuration. NixOS takes the concept of a declarative configuration used by the Nix package manager and expands it to the entire system!
In a single configuration file `hardware.nix` you can define all of your system configuration including file system, mounting points, GPU configuration and anything else. You can even change your boot manager from Grub to Systemd boot with simply changing this single file.
The first version of the `hardware.nix` file is generated during install of NixOS with the help of a modified [Calamares](https://calamares.io/) installer, making it a very easy process and most likely will not have to be touched again.
But the beauty is that if you ever wanted to distro hop and switch back to nix, you simply need to include these 2 config files and the system would be completely restored.
## NixOS Home Manager
Home manager is not an official feature of NixOS but a tool that has been create to support the NixOS platform. it allows you to declarative configure your home directory.
One very powerful use is to make your VS Code configuration declarative and reproducible. Bellow I have included my personal VS Code config using home manager!
``` nix
programs.vscode = {
enable = true;
userSettings = {
"window.titleBarStyle" = "custom";
"editor.tabSize" = "2";
"editor.minimap.enabled" = false;
"editor.rulers" = [80 120];
"editor.fontFamily" = "'Source Code Pro', 'monospace', monospace";
"workbench.colorTheme" = "Gruvbox Dark Medium";
"git.enableSmartCommit" = true;
"git.confirmSync" = false;
};
extensions = with pkgs.vscode-extensions; [
jdinhlife.gruvbox
vscode-icons-team.vscode-icons
eamodio.gitlens
donjayamanne.githistory
mhutchie.git-graph
esbenp.prettier-vscode
dbaeumer.vscode-eslint
ms-azuretools.vscode-docker
irongeek.vscode-env
yzhang.markdown-all-in-one
bbenoist.nix
bmewburn.vscode-intelephense-client
ms-python.python
ms-dotnettools.csharp
ms-vscode.cpptools
redhat.java
redhat.vscode-yaml
christian-kohler.path-intellisense
golang.go
bradlc.vscode-tailwindcss
redhat.vscode-xml
] ++ pkgs.vscode-utils.extensionsFromVscodeMarketplace [
{
name = "volar";
publisher = "vue";
version = "2.0.10";
sha256 = "sha256-L5z7Rg8ybHTCGwO9HHExg0BfTBvO34Uz40NrNpzDgBk=";
} {
name = "astro-vscode";
publisher = "astro-build";
version = "2.8.6";
sha256 = "sha256-sVLTOMdn+vDOpPGwTf0MJ+7tdQdJUVESdQ2HdmP0c1o=";
}
];
};
```
## Flakes
Flakes are a new and experimental feature of NixOS but allow you to pull your configuration out of the `/nix` directory and sore it as you would your dot files in a single git repo in your home folder. This feature has been adopted by most of the NixOS community, and it often used along with home manager.
You can use flakes to store all of your configurations in a single git repo in your home directory, and after very build of your flake produce a completely version locked config file. This is similar to a `package-lock.json` file. it stores the exact commit hash of the package to be 100% and totally reproducible across any system.
## More resources
If you are interested in using NixOS yourself or configuring a flake I would highly recommend these tutorials.
- [NixOS Config Guides for Nerds and Other Cool People - LibrePhoenix](https://youtube.com/playlist?list=PL_WcXIXdDWWpuypAEKzZF2b5PijTluxRG&si=D-A2Wdu3DaTGZRqi)
- [Nix tutorials - Vimjoyer](https://youtube.com/playlist?list=PLko9chwSoP-15ZtZxu64k_CuTzXrFpxPE&si=rolFSmkmcuKiqcWg)
| jwoodrow99 |
1,885,122 | Pregnancy Termination Clinic California | We understand unwanted pregnancy can put a lot of stress on the physical and mental health of a... | 0 | 2024-06-12T03:47:18 | https://dev.to/hsc78/pregnancy-termination-clinic-california-15k3 | We understand unwanted pregnancy can put a lot of stress on the physical and mental health of a woman. In such situations, Termination of Pregnancy (TOP) or abortion can be a blessing for her. The termination can be safely performed until the end of the second trimester as per state law. There are two types of procedures are available for Termination of Pregnancy.
**● Medical Abortion:**
Use of medicines for termination of pregnancy up to 10 weeks or 70 days.
**● Surgical Abortion:**
Use of surgical methods for termination of pregnancy.
**Abortion Pill**
When to choose medication abortion/abortion pill?
● If a woman prefers medications over a surgical procedure
● Up to 70 days of pregnancy, it is considered more effective than surgical abortion
● If a woman has a congenital deformity of the uterus or narrowing of the lower part of the uterus (cervix)
● The woman can take some medications at home, which is more convenient
Free Abortion Pill To Low Income Patients without Insurance
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**Pre-abortion procedures:**
Abortion can be a mentally stressful procedure, so counseling holds an important place in pre-abortion procedures. The main objectives of this counseling are to:
● Help the woman to make an informed decision
● Provide knowledge about the procedure
● Remove the anxiety related to the procedure
This counseling can be performed by a nurse, doctor or an experienced counselor. During counseling, the woman is given pregnancy options counseling and informed consent-related counseling. A woman may have a variety of reasons for opting for an abortion. The counseling helps in making the correct decision without any mental stress. The counseling also gives an opportunity to prepare the woman for possible adverse effects of the medical abortion. Your doctor will have to ascertain a few things before he/she can administer the procedure. These include the following investigations:
● Ultrasound for confirmation of pregnancy and estimation of duration of pregnancy
● Measurement of vital signs (Temperature, Pulse, Blood Pressure, Respiratory Rate)
● Blood grouping
● Lab tests for sexually transmitted diseases
**free abortion clinics, free abortion pill
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**How this regimen is used (FDA regimen)**
3 days and at least 2 visits to a clinic are required for this method.
**Day 1**
During the initial visit, history is taken and examination of the woman is done followed by pre-abortion counseling and investigations. Once the consent is obtained and contraindications are excluded, a tablet containing 200 mg of Mifepristone (RU-486) is given orally to the woman and advised to re-visit on day 2-or 3.
**Day 2 or 3**
She is given the second tablet containing misoprostol (800 micrograms) on day 2 or 3 at the clinic. Usually following consumption of the second tablet, there will be bleeding from the vagina and cramps will be felt in the abdomen. This is due to the contraction of the uterus and expulsion of aborted products of pregnancy. Antibiotics may also be given to prevent the infection. A pain killer medicine can be given to alleviate the pain.
**Follow up visit**
She is advised to visit on day 15 for re-examination and to ascertain that the abortion is complete. It also gives an opportunity for a doctor to check the health status of the woman. Call us to find out the contraindications of the regimen.
**more info** : [pregnancy termination clinic california](https://hersmartchoice.com/abortion-clinic/east-los-angeles-women-health-center/)
| hsc78 | |
1,885,114 | regexp lazy match | case demo string is /sbin/dhclient /xx -4 -d -nw -cf /run/dhclient/dhclient_eth1.conf -pf... | 0 | 2024-06-12T03:33:33 | https://dev.to/eiguleo/regexp-lazy-match-4bjf | # case
demo string is
/sbin/dhclient /xx -4 -d -nw -cf /run/dhclient/dhclient_eth1.conf -pf /run/dhclient/dhclient_eth1.pid
# target
/run/dhclient/ is prefix path, it would change as os version changes, so get the /run/dhclient/
# code
`echo "/sbin/dhclient /xx -4 -d -nw -cf /run/dhclient/dhclient_eth1.conf -pf /run/dhclient/dhclient_eth1.pid" | grep -P "/\S*?eth1.conf " --color`
# resp
/run/dhclient/dhclient_eth1.conf | eiguleo | |
1,885,117 | 北川 源太郎（KITAGAWA GENTAROU）：東洋経済と融合した金融戦略家 | 北川 源太郎 KITAGAWA GENTAROU 出生地: 東京都 学歴:： 学生時代から数字と金融に興味があり、東京大学で金融学を学び卒業しました。有名な投資銀行に入社し、金融アナリストとして 20... | 0 | 2024-06-12T03:33:11 | https://dev.to/kitagawagentarou/bei-chuan-yuan-tai-lang-kitagawa-gentaroudong-yang-jing-ji-torong-he-sitajin-rong-zhan-lue-jia-4kbj | 北川源太郎, 北川源太郎kitagawagentarou | 北川 源太郎 KITAGAWA GENTAROU
出生地: 東京都
学歴:：
学生時代から数字と金融に興味があり、東京大学で金融学を学び卒業しました。有名な投資銀行に入社し、金融アナリストとして 20 年以上のキャリアをスタートさせました。
簡単な経歴:
シニア金融アナリストとして、豊富な投資経験と専門知識を持ち、さまざまな財務分析手法に精通しており、多くの金融商品と市場動向をよく理解しています。
2008年、リーマンショックが私の家族とキャリアに深刻な影響を与えました。私は親戚や友人の紹介で山口秀久さんと出会いました。
彼は私の人生の方向性を再定義し、卓越した個人的な洞察力と予測能力、そして豊富な実務経験によって再び高い成果を上げることが出来ました。その後、山口秀久氏の会社に入社し、パートナーとなる。
過去 20 年間にわたり、私はさまざまな国で働き、生活してきましたが、さまざまな文化やビジネス環境を深く理解しており、これまでに数多くの複雑な投資プロジェクトや取引に参加し、貴重な実務経験を積み上げてきました。見識がさらに広がったことで、複雑な国境を越えた投資プロジェクトを処理できるようになり、業界で高い評価を得ています。さまざまな投資リスクを回避できるように、多くの投資に対して高利回りの投資戦略を策定します。同時に、専門的な財務分析と投資アドバイスも提供します。
実績:：
20 年以上にわたり、絶え間なく変化する金融市場において、鋭い洞察力と将来を見据えた思考を維持し、市場動向を正確に把握し、潜在的な投資リスクと機会を洞察し、現実的な投資戦略を策定することができます。
ギャン理論などのテクニカル分析で多大な功績を残しており、チャート分析の第一人者として、個人投資家向けの投資教育活動にも積極的に取り組んでおり、これまでに受講者数は数千人を超えている。投資コミュニティで圧倒的な人気を誇っています。代表的な手法としては「移動平均大サイクル分析」「大サイクルMACD」「大サイクル確率指標」などが挙げられます。
概要:：
1996 年にペンシルバニア大学を卒業、金融の修士号を取得しました。
1999年に経済学博士号を取得後、フィデリティ社経済調査部に入社し、制度調査室に配属。
経済調査部主に東アジアの経済調査、経済構造分析等を担当
2003 年にフィデリティ ファンド投資部に投資アナリストとして異動し、ファンド プロジェクトの開発、株式市場の分析と調査を担当し、顧客に合わせた多様な投資戦略の策定に注力しました。
2009年にフィデリティ・インターナショナルの日本事業のファンドマネージャーに就任。また、FIL インベストメンツ (ジャパン) リミテッドの資産運用事業責任者および FIL 証券株式会社の責任者でもあり、日本の個人投資家に投資商品とサービスを提供しています。
2014年ベインキャピタルは株式会社プライベートエクイティ投資部入社
2019年よりプライベートエクイティファンド販売プロジェクトマネージャーを務める。
投資の基本
株式:：
会社の資本を表し、リスクとリターンが高くなります。
債券：
リスクは低いがリターンが比較的低い債券
ファンド：
投資リスクを分散するための株式ファンド、債券ファンドなど
その他の資産: 不動産、金などの物理的な資産。
投資目標の設定：
個人のリスク許容度、投資期間等に応じて投資目標を決定
価値の維持と価値の向上、定期的な収入、資本の増加などのさまざまな目標。
投資原則を学ぶ: 分散: すべての卵を 1つのカゴに入れないこと。
通常枠：
平均コスト、変動リスクを軽減
長期投資: 忍耐と合理性を保ち、長期的なチャンスを掴みます。
資産配分の概念:：
株式、債券、現金などのさまざまな種類の資産のウェイト配分など、リスクと目標リターンに基づいて、さまざまな種類の資産の投資割合を合理的に割り当てます。
配分方法に関する説明：
リスクと目標リターンのバランスをとり、資産配分を定期的に調整し、市場の変化に適応し、経済状況と市場動向に細心の注意を払い、変化に応じて適時に資産配分を調整する。
ポートフォリオの分散:：
複数の資産タイプを含む投資ポートフォリオを構築し、単一資産のリスクを軽減し、ETF やインデックス ファンドなどの投資ツールの特性を理解します。
さまざまなツールを適切に活用してポートフォリオを構築し、定期的な投資では忍耐と規律を保ち、長期的な経済成長から生まれる投資機会を捉え、経済情勢や市場動向に細心の注意を払い、変化に応じて投資ポートフォリオを柔軟に調整します。 | kitagawagentarou |
1,885,115 | Step-by-Step Guide: Making Your Angular Application SEO-Friendly with Server-Side Rendering and Firebase Deployment | The client calls for an early 7:00 am meeting and says they've talked with the SEO experts, and our... | 0 | 2024-06-12T03:32:06 | https://dev.to/khatiwadasaurav/angular-universal-and-firebase-deployment-38g9 | angular, seo, firebase, ssr | The client calls for an early 7:00 am meeting and says they've talked with the SEO experts, and our site ranks really low on SEO, so we're not getting any interactions on Google search. This happened after a month of deploying our application. The client bluntly says, "What's the point of the business if people can't find us on Google?" That was indeed a very true statement, and I agreed with the notion. So, a cup of coffee later, I started digging around to find out how to make my Angular 18 application SEO-friendly.
After some digging, I came across Server-Side Rendering (SSR) and two packages, namely "@angular/platform-server" and "@angular/ssr".
If you look at angular.dev in the SSR section, they'll show you the three server files that will look something like this:
`my-app
|-- server.ts # application server
└── src
|-- app
| └── app.config.server.ts # server application configuration
└── main.server.ts # main server application bootstrapping`
So I went ahead and created the three server files in my application.
Before I go ahead and show the contents of the three server files, there was another change that I needed to make in my app.config.ts file.
I had to modify my providers to add two new Factory Providers, namely provideZoneChangeDetection, which comes from the '@angular/core' package, and provideClientHydration, which comes from the '@angular/platform-browser' package.
The provideZoneChangeDetection is self-explanatory in the sense that we're configuring the Angular application to use Zone.js for change detection, and the eventCoalescing option ensures that change detection runs only once when multiple events of the same type are triggered.
The provideClientHydration is solely for Angular Universal, which tells the application to reuse the server-rendered HTML on the client side when the Angular application starts up, instead of completely re-rendering the application
```
providers: [
provideZoneChangeDetection({ eventCoalescing: true }),
provideClientHydration()
...rest of the Factory providers
]
```
With these changes, we now move on to the server files.
We start with app.config.server.ts by defining the config like this:
```
const serverConfig: ApplicationConfig = {
providers: [provideServerRendering()],
};
export const config = mergeApplicationConfig(appConfig, serverConfig);
```
The config passed into the mergeApplicationConfig is both the new server config as well as the previous config that we've changed to provide change detection and client hydration.
With these changes, we move to the main.server.ts.
The code in main.server.ts looks like this:
```
const bootstrap = () =>
bootstrapApplication(AppComponent, {
providers: config.appConfig.providers,
});
export default bootstrap;
```
The exported bootstrap module is going to be imported into the server.ts file, and server.ts will be our main server that serves our application for SSR.
It will look something like this.
```
export function app(): express.Express {
const server = express();
const serverDistFolder = dirname(fileURLToPath(import.meta.url));
const browserDistFolder = resolve(serverDistFolder, '../browser');
const indexHtml = join(serverDistFolder, 'index.server.html');
const commonEngine = new CommonEngine();
server.set('view engine', 'html');
server.set('views', browserDistFolder);
server.get(
'**',
express.static(browserDistFolder, {
maxAge: '1y',
index: 'index.html',
}),
);
// All regular routes use the Angular engine
server.get('**', (req, res, next) => {
const { protocol, originalUrl, baseUrl, headers } = req;
commonEngine
.render({
bootstrap,
documentFilePath: indexHtml,
url: `${protocol}://${headers.host}${originalUrl}`,
publicPath: browserDistFolder,
providers: [{ provide: APP_BASE_HREF, useValue: baseUrl }],
})
.then(html => res.send(html))
.catch(err => next(err));
});
return server;
}
function run(): void {
const port = process.env['PORT'] || 4000;
// Start up the Node server
const server = app();
server.listen(port, () => {
console.log(`Node Express server listening on http://localhost:${port}`);
});
}
run();
```
at this point you may have seen that we are using express inside the server.ts file and that is correct , we are indeed using express to create a server and serve the application from there.
You can also see the bootstrap module getting passed into the render function of the common engine which comes from the angular/ssr package that we've installed in the beginning.
In terms of config we're 90% there . we now will have to make changes to the angular.json file to make sure that the builds will be ssr supported.
In your build section of angular.json after the scripts section add this
```
"extractLicenses": false,
"sourceMap": true,
"optimization": false,
"namedChunks": true,
"server": "src/main.server.ts",
"prerender": true,
"ssr": {
"entry": "server.ts"
}
```
with this piece in place the configuration is now complete.
Now when you run your build script , you'll see that it will create another folder inside dist called server. you can create a script to serve the application from the dist folder like
```
"serve:ssr": "node dist/your-app-name/server/server.mjs",
```
You can notice that the view engine is mjs, I will not go into details of that piece of code , feel free to look at the server.ts file to modify that but with this you should have ssr ready.
Now when you use meta from @angular/platform-browser you should be able to see the tags created when you go and view the particular page source
something like this
```
import { Meta } from '@angular/platform-browser';
private metaService = inject(Meta);
this.metaService.addTag({
name: 'description',
content: 'Welcome to our page !',
});
```
The second piece is hosting the application using Firebase. Its really straight forward all we need to do is change the firebase.json file to look something like this.
```
"hosting": {
"public": "dist/your-application-name/browser",
"rewrites": [
{
"source": "**",
"destination": "/index.html"
}
]
}
}
```
we still want to deploy the client code, not the server code in firebase if you're using firebase deploy command like I was, so we're pointing to browser rather than server in our config. you should still be able to see the meta tags in the client bundle , due to the configuration change we've made in angular.json file. And with these steps I was able to see the meta tags and the content that was rendered in browser into the page source.
This has been my experience making Angular application SEO friendly. Thankyou for reading through the post.
Acknowledgements
This article was inspired by the Angular SSR implementations found on the following GitHub pages:
"ganatan/angular-ssr" (https://github.com/ganatan/angular-ssr)
"angular-university/angular-ssr-course" (https://github.com/angular-university/angular-ssr-course)
I would like to express my gratitude to the contributors of both projects for their valuable insights and code examples, which have greatly assisted me in creating this content. | khatiwadasaurav |
1,885,113 | Research on Binance Futures Multi-currency Hedging Strategy Part 2 | The original research report address: https://www.fmz.com/digest-topic/5584 You can read it first,... | 0 | 2024-06-12T03:22:52 | https://dev.to/fmzquant/research-on-binance-futures-multi-currency-hedging-strategy-part-2-144p | strategy, cryptocurrency, fmzquant, binance | The original research report address: https://www.fmz.com/digest-topic/5584 You can read it first, this article won't have duplicate content. This article will highlights the optimization process of the second strategy. After the optimization, the second strategy is improved obviously, it is recommended to upgrade the strategy according to this article. The backtest engine added the statistics of handling fee.
```
# Libraries to import
import pandas as pd
import requests
import matplotlib.pyplot as plt
import seaborn as sns
import numpy as np
%matplotlib inline
```
```
symbols = ['ETH', 'BCH', 'XRP', 'EOS', 'LTC', 'TRX', 'ETC', 'LINK', 'XLM', 'ADA', 'XMR', 'DASH', 'ZEC', 'XTZ', 'BNB', 'ATOM', 'ONT', 'IOTA', 'BAT', 'VET', 'NEO', 'QTUM', 'IOST']
```
```
price_usdt = pd.read_csv('https://www.fmz.com/upload/asset/20227de6c1d10cb9dd1.csv ', index_col = 0)
price_usdt.index = pd.to_datetime(price_usdt.index)
```
```
price_usdt_norm = price_usdt/price_usdt.fillna(method='bfill').iloc[0,]
```
```
price_usdt_btc = price_usdt.divide(price_usdt['BTC'],axis=0)
price_usdt_btc_norm = price_usdt_btc/price_usdt_btc.fillna(method='bfill').iloc[0,]
```
```
class Exchange:
def __init__(self, trade_symbols, leverage=20, commission=0.00005, initial_balance=10000, log=False):
self.initial_balance = initial_balance # Initial asset
self.commission = commission
self.leverage = leverage
self.trade_symbols = trade_symbols
self.date = ''
self.log = log
self.df = pd.DataFrame(columns=['margin','total','leverage','realised_profit','unrealised_profit'])
self.account = {'USDT':{'realised_profit':0, 'margin':0, 'unrealised_profit':0, 'total':initial_balance, 'leverage':0, 'fee':0}}
for symbol in trade_symbols:
self.account[symbol] = {'amount':0, 'hold_price':0, 'value':0, 'price':0, 'realised_profit':0, 'margin':0, 'unrealised_profit':0,'fee':0}
def Trade(self, symbol, direction, price, amount, msg=''):
if self.date and self.log:
print('%-20s%-5s%-5s%-10.8s%-8.6s %s'%(str(self.date), symbol, 'buy' if direction == 1 else 'sell', price, amount, msg))
cover_amount = 0 if direction*self.account[symbol]['amount'] >=0 else min(abs(self.account[symbol]['amount']), amount)
open_amount = amount - cover_amount
self.account['USDT']['realised_profit'] -= price*amount*self.commission # Minus handling fee
self.account['USDT']['fee'] += price*amount*self.commission
self.account[symbol]['fee'] += price*amount*self.commission
if cover_amount > 0: # close position first
self.account['USDT']['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount # Profit
self.account['USDT']['margin'] -= cover_amount*self.account[symbol]['hold_price']/self.leverage # Free margin
self.account[symbol]['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount
self.account[symbol]['amount'] -= -direction*cover_amount
self.account[symbol]['margin'] -= cover_amount*self.account[symbol]['hold_price']/self.leverage
self.account[symbol]['hold_price'] = 0 if self.account[symbol]['amount'] == 0 else self.account[symbol]['hold_price']
if open_amount > 0:
total_cost = self.account[symbol]['hold_price']*direction*self.account[symbol]['amount'] + price*open_amount
total_amount = direction*self.account[symbol]['amount']+open_amount
self.account['USDT']['margin'] += open_amount*price/self.leverage
self.account[symbol]['hold_price'] = total_cost/total_amount
self.account[symbol]['amount'] += direction*open_amount
self.account[symbol]['margin'] += open_amount*price/self.leverage
self.account[symbol]['unrealised_profit'] = (price - self.account[symbol]['hold_price'])*self.account[symbol]['amount']
self.account[symbol]['price'] = price
self.account[symbol]['value'] = abs(self.account[symbol]['amount'])*price
return True
def Buy(self, symbol, price, amount, msg=''):
self.Trade(symbol, 1, price, amount, msg)
def Sell(self, symbol, price, amount, msg=''):
self.Trade(symbol, -1, price, amount, msg)
def Update(self, date, close_price): # Update assets
self.date = date
self.close = close_price
self.account['USDT']['unrealised_profit'] = 0
for symbol in self.trade_symbols:
if np.isnan(close_price[symbol]):
continue
self.account[symbol]['unrealised_profit'] = (close_price[symbol] - self.account[symbol]['hold_price'])*self.account[symbol]['amount']
self.account[symbol]['price'] = close_price[symbol]
self.account[symbol]['value'] = abs(self.account[symbol]['amount'])*close_price[symbol]
self.account['USDT']['unrealised_profit'] += self.account[symbol]['unrealised_profit']
if self.date.hour in [0,8,16]:
pass
self.account['USDT']['realised_profit'] += -self.account[symbol]['amount']*close_price[symbol]*0.01/100
self.account['USDT']['total'] = round(self.account['USDT']['realised_profit'] + self.initial_balance + self.account['USDT']['unrealised_profit'],6)
self.account['USDT']['leverage'] = round(self.account['USDT']['margin']/self.account['USDT']['total'],4)*self.leverage
self.df.loc[self.date] = [self.account['USDT']['margin'],self.account['USDT']['total'],self.account['USDT']['leverage'],self.account['USDT']['realised_profit'],self.account['USDT']['unrealised_profit']]
```
The performance of the original strategy, after the currency type selection, performed well, but there are still many holding positions, generally around 4 times
Principle:
- Update the market quotes and account holding positions, the initial price will be recorded in the first run (newly added currencies are calculated according to the time of joining)
- Update the index, the index is the altcoin-bitcoin price index = mean (sum ((altcoin price / bitcoin price) / (altcoin initial price / bitcoin initial price)))
- Judging long and short operation according to the deviation index, and judging the position size according to the deviation size
- Placing orders, the order quantity is determined by the iceberg commission strategy, and the transaction is executed according newest executable price
- Loop again
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) # Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2b = e
(stragey_2b.df['total']/stragey_2b.initial_balance).plot(figsize=(17,6),grid = True);
```
```
stragey_2b.df['leverage'].plot(figsize=(18,6),grid = True); # leverage
```
```
pd.DataFrame(e.account).T.apply(lambda x:round(x,3)) # holding position
```
## Why improve
The original biggest problem is the comparison between the latest price and the initial price started by the strategy. As the time passes, it will become more and more deviated. We will accumulate a lot of positions in these currencies. The biggest problem with filtering currencies is that we may still have unique currencies in the future based on our past experience. The following is the performance of non-filtering mode. In fact, when trade_value = 300, in the middle stage of the strategy running, it has already lost everything. Even if it is not, LINK and XTZ also hold positions above 10000USDT, which is too large. Therefore, we must solve this problem in the backtest and pass the test of all currencies.
```
trade_symbols = list(set(symbols)) # Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2c = e
(stragey_2c.df['total']/stragey_2c.initial_balance).plot(figsize=(17,6),grid = True);
```
```
pd.DataFrame(stragey_2c.account).T.apply(lambda x:round(x,3)) # Last holding position
```
```
((price_usdt_btc_norm.iloc[-1:] - price_usdt_btc_norm_mean[-1]).T) # Each currency deviates from the initial situation
```
Since the cause of the problem is to compare with the initial price, it may be more and more biased. We can compare it with the moving average of the past period of time, backtest the full currency and see the results below.
```
Alpha = 0.05
#price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.rolling(20).mean() #Ordinary moving average
price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.ewm(alpha=Alpha).mean() # Here is consistent with the strategy, using EMA
trade_symbols = list(set(symbols))#All currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm2[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm2.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2d = e
#print(N,stragey_2d.df['total'][-1],pd.DataFrame(stragey_2d.account).T.apply(lambda x:round(x,3))['value'].sum())
```
The performance of the strategy has fully met our expectations, and the returns are almost the same. The situation of bursting account positions in the original currency of the entire currencies has also smoothly transitioned, and there is almost no retracement. The same opening position size, almost all leverage is below 1 times, on 12th March 2020 price plunged extreme case, it still does not exceed 4 times, which means that we can increase trade_value, and under the same leverage, double the profit. The final holding position is only BCH exceeding 1000USDT, which is very good.
Why would the position be lowered? Imagine joining the altcoin index unchanged, one coin has increased by 100%, and it will be maintained for a long time. The original strategy will hold short positions of 300 * 100 = 30000USDT for a long time, and the new strategy will eventually track the benchmark price At the latest price, you will not hold any position at the end.
```
(stragey_2d.df['total']/stragey_2d.initial_balance).plot(figsize=(17,6),grid = True);
#(stragey_2c.df['total']/stragey_2c.initial_balance).plot(figsize=(17,6),grid = True);
```
```
stragey_2d.df['leverage'].plot(figsize=(18,6),grid = True);
stragey_2b.df['leverage'].plot(figsize=(18,6),grid = True); # Screen currency strategy leverage
```
```
pd.DataFrame(stragey_2d.account).T.apply(lambda x:round(x,3))
```
What will happen to the currency with the screening mechanism, with the same parameters, the earlier stage profits performs better, the retracement is smaller, but the overall returns are slightly lower. Therefore, it is recommended to have a screening mechanism.
```
#price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.rolling(50).mean()
price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.ewm(alpha=0.05).mean()
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) # Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm2[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm2.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2e = e
```
```
#(stragey_2d.df['total']/stragey_2d.initial_balance).plot(figsize=(17,6),grid = True);
(stragey_2e.df['total']/stragey_2e.initial_balance).plot(figsize=(17,6),grid = True);
```
```
stragey_2e.df['leverage'].plot(figsize=(18,6),grid = True);
```
```
pd.DataFrame(stragey_2e.account).T.apply(lambda x:round(x,3))
```
## Parameter optimization
The larger the setting of the Alpha parameter of the exponential moving average, the more sensitive the benchmark price tracking, the less transactions, the lower the final holding position. when lower the leverage, the return also reduced. Lower the maximum retracement, it can increase transaction volume. The specific balance operations need based on the backtest results.
Since the backtest is a 1h K line, it can only be updated once an hour, the real market can be updated faster, and it is necessary to weigh the specific settings comprehensively.
This is the result of optimization:
```
for Alpha in [i/100 for i in range(1,30)]:
#price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.rolling(20).mean() # Ordinary moving average
price_usdt_btc_norm2 = price_usdt_btc/price_usdt_btc.ewm(alpha=Alpha).mean() # Here is consistent with the strategy, using EMA
trade_symbols = list(set(symbols))# All currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm2[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm2.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2d = e
# These are the final net value, the initial maximum backtest, the final position size, and the handling fee
print(Alpha, round(stragey_2d.account['USDT']['total'],1), round(1-stragey_2d.df['total'].min()/stragey_2d.initial_balance,2),round(pd.DataFrame(stragey_2d.account).T['value'].sum(),1),round(stragey_2d.account['USDT']['fee']))
```
```
0.01 21116.2 0.14 15480.0 2178.0
0.02 20555.6 0.07 12420.0 2184.0
0.03 20279.4 0.06 9990.0 2176.0
0.04 20021.5 0.04 8580.0 2168.0
0.05 19719.1 0.03 7740.0 2157.0
0.06 19616.6 0.03 7050.0 2145.0
0.07 19344.0 0.02 6450.0 2133.0
0.08 19174.0 0.02 6120.0 2117.0
0.09 18988.4 0.01 5670.0 2104.0
0.1 18734.8 0.01 5520.0 2090.0
0.11 18532.7 0.01 5310.0 2078.0
0.12 18354.2 0.01 5130.0 2061.0
0.13 18171.7 0.01 4830.0 2047.0
0.14 17960.4 0.01 4770.0 2032.0
0.15 17779.8 0.01 4531.3 2017.0
0.16 17570.1 0.01 4441.3 2003.0
0.17 17370.2 0.01 4410.0 1985.0
0.18 17203.7 0.0 4320.0 1971.0
0.19 17016.9 0.0 4290.0 1955.0
0.2 16810.6 0.0 4230.6 1937.0
0.21 16664.1 0.0 4051.3 1921.0
0.22 16488.2 0.0 3930.6 1902.0
0.23 16378.9 0.0 3900.6 1887.0
0.24 16190.8 0.0 3840.0 1873.0
0.25 15993.0 0.0 3781.3 1855.0
0.26 15828.5 0.0 3661.3 1835.0
0.27 15673.0 0.0 3571.3 1816.0
0.28 15559.5 0.0 3511.3 1800.0
0.29 15416.4 0.0 3481.3 1780.0
```
From: https://blog.mathquant.com/2020/05/09/research-on-binance-futures-multi-currency-hedging-strategy-part-2.html | fmzquant |
1,885,112 | List expansions - Beer CSS Tips #5 | Hello, I want to share a serie of posts containing some tips of Beer CSS. Beer CSS is a new... | 27,968 | 2024-06-12T03:21:49 | https://dev.to/leonardorafael/list-expansions-beer-css-tips-5-384e | css, tutorial, ui, ux | Hello,
I want to share a serie of posts containing some tips of Beer CSS. Beer CSS is a new framework around, based on (not restricted to) Material Design 3. Material Design 3 is a design system created by Google. In this post, we will learn about the list expansions. The list expansions are lists with items and subitems.
If you don't known the concept of **settings**, **elements** and **helpers** used by Beer CSS, you can [read this page](https://github.com/beercss/beercss/blob/main/docs/INDEX.md).
1) First, we will create some items inside an `article` element.
```html
<article>
<a class="row wave">Item 1</a>
<a class="row wave">Item 2</a>
<a class="row wave">Item 3</a>
<a class="row wave">Item 4</a>
<a class="row wave">Item 5</a>
</article>
```
2) Now we will use the `details` and `summary` elements to have items and subitems. Use the `none` helper on `summary` element to empty the default styles from browser. In this example, after click on "Item 1" it will show the other items:
```html
<article>
<details>
<summary class="none">
<a class="row wave">Item 1</a>
</summary>
<a class="row wave">Item 2</a>
<a class="row wave">Item 3</a>
<a class="row wave">Item 4</a>
<a class="row wave">Item 5</a>
</details>
</article>
```
3) You can reuse the items and subitems code in any other element like `nav`, `menu`, `tooltip`, `dialog`, etc:
```html
<nav class="drawer">
<details>
<summary class="none">
<a class="row wave">Item 1</a>
</summary>
<a class="row wave">Item 2</a>
<a class="row wave">Item 3</a>
<a class="row wave">Item 4</a>
<a class="row wave">Item 5</a>
</details>
</nav>
```
4) How about a multi-level menu? We can do a multi-level menu using the same code inside a `tooltip` element. And the `tooltip` element inside a `summary` element:
```html
<nav class="drawer">
<details>
<summary class="none">
<a class="row wave">Item 1</a>
<div class="tooltip max right">
<details>
<summary class="none">
<a class="row wave">Item 1</a>
</summary>
<a class="row wave">Item 2</a>
<a class="row wave">Item 3</a>
<a class="row wave">Item 4</a>
<a class="row wave">Item 5</a>
</details>
</div>
</summary>
<a class="row wave">Item 2</a>
<a class="row wave">Item 3</a>
<a class="row wave">Item 4</a>
<a class="row wave">Item 5</a>
</details>
</nav>
```
The **helpers** of Beer CSS can be used in any **element**. This makes the framework very customizable. It has the same logic and names in all ways. This makes the Beer CSS very easy to understand and reuse. I made a codepen to see some list expansions created with Beer CSS [here](https://codepen.io/leo-bnu/pen/Baewrgg).
Hope you enjoy this article. Thanks for read!
Beer CSS:
https://www.beercss.com
Material Design 3:
https://m3.material.io/
Codepen:
https://codepen.io/leo-bnu/pen/Baewrgg
About settings, elements and helpers used by Beer CSS:
https://github.com/beercss/beercss/blob/main/docs/INDEX.md
| leonardorafael |
1,885,072 | The Era of Digital Nomads | SQLynx: The Best Choice for Individual Developers | In the age of digital nomads, where flexibility and remote work have become the norm, choosing the... | 0 | 2024-06-12T03:16:46 | https://dev.to/concerate/the-era-of-digital-nomads-sqlynx-the-best-choice-for-individual-developers-np | In the age of digital nomads, where flexibility and remote work have become the norm, choosing the right tools is crucial for individual developers.
SQLynx stands out as the best choice for personal developers due to its user-friendly interface, powerful features, and efficiency in handling SQL queries and database management.
SQLynx provides an intuitive environment that simplifies database tasks, making it accessible even for those who are not deeply familiar with SQL. Its graphical interface allows users to perform complex operations with ease, reducing the learning curve and increasing productivity.
Moreover, SQLynx excels in performance. It is designed to handle large datasets efficiently, which is critical for developers who often work with significant amounts of data. Its advanced features, such as data export, schema comparison, and real-time query monitoring, are tailored to meet the needs of both novice and experienced developers.
In a world where developers are constantly on the move and require reliable, robust tools to manage their databases effectively, SQLynx emerges as the optimal solution, offering the perfect blend of simplicity, power, and performance.
**Tool Stability Issues**
Individual developers, due to their varying work hours, locations, and devices, place a high priority on software stability when choosing SQL Editors. Whether it’s issues with personal computer performance, unstable internet connections, or slow data processing speeds, these factors can trigger a series of disruptions.
As a web-based development tool, SQLynx requires no installation and can be used immediately after download. It consistently leads in data processing speed and stability, exporting 13 million records in just 74 seconds, significantly boosting work efficiency.
**Security Issues**
Data security is one of the critical concerns in database management. Individual developers might lack the resources and experience to establish and maintain comprehensive data security strategies, potentially facing risks such as data breaches and data loss.
When people hear "web-based tool," the first concern is often security. Rest assured, _**SQLynx is deployed in your local environment**_, ensuring that all your information remains on your local system. SQLynx cannot access your data, eliminating any risk of data breaches. Additionally, SQLynx supports one-click data backup and recovery, helping to mitigate the risk of data loss.
Cross-Platform Compatibility
In multi-platform development, cross-platform compatibility of databases is a crucial consideration. Individual developers might need to handle differences between various database systems, such as migrating data between different databases or ensuring that applications are compatible across different database platforms.
SQLynx supports Windows, macOS, and Linux, meeting development needs in any scenario. It is compatible with major data sources like MySQL, Oracle, PostgreSQL, SQL Server, SQLite, and MongoDB.
**Cost Considerations**
For individual developers, cost is a significant factor. Many SQL tools require a paid purchase or subscription, while open-source database software, though free, may lack robust performance support.
SQLynx is free for individual users for non-commercial use.
Download Link: http://www.sqlynx.com/en/#/home/probation/SQLynx
| concerate | |
1,885,070 | Demystifying the SIP Server: The Heart of Your VoIP Communication | In today's communication landscape, Voice over IP (VoIP) has become a ubiquitous technology. But have... | 0 | 2024-06-12T03:12:36 | https://dev.to/epakconsultant/demystifying-the-sip-server-the-heart-of-your-voip-communication-5hg2 | voip | In today's communication landscape, Voice over IP (VoIP) has become a ubiquitous technology. But have you ever wondered what orchestrates those seamless phone calls over the internet? Enter the SIP server, the unsung hero behind smooth VoIP communication. This article delves into the world of SIP servers, exploring their functionalities, benefits, and deployment considerations.
## Unpacking the SIP Protocol
The magic behind VoIP lies in the Session Initiation Protocol (SIP). SIP acts like a language, establishing, managing, and terminating multimedia sessions, including voice, video, and instant messaging, over IP networks.
## The SIP Server: The Maestro of Communication
A SIP server serves as the central hub for all SIP communication within a network. It acts like a conductor, coordinating the flow of information between various entities:
• User Agents (UAs): These can be softphones (software applications on computers or mobile devices) or IP phones (dedicated VoIP handsets). UAs register with the SIP server and initiate calls by sending SIP messages.
• Registrars: A SIP server often incorporates a registrar function. UAs register their presence and location with the registrar, enabling the server to find them when a call is initiated.
• Gateways: These components connect the VoIP network to traditional phone networks (PSTN), allowing users to make and receive calls to/from landline numbers.
## Core Functionalities of a SIP Server
A SIP server performs several critical tasks to ensure smooth VoIP communication:
• Registration: UAs register with the server, providing their identity and availability information.
• Call Routing: When a call is initiated, the SIP server deciphers the destination address and routes the call to the appropriate UA or gateway.
• Session Management: The server establishes, manages, and terminates call sessions, keeping track of call states and participants.
• Security: SIP servers can implement security measures like authentication and encryption to protect communication channels.
[Streamlining Security: Optimizing CPU and Memory Usage for HTTPS Traffic
](https://cloudbelievers.blogspot.com/2024/06/streamlining-security-optimizing-cpu.html)
## The Advantages of Utilizing a SIP Server
There are several compelling reasons to incorporate a SIP server into your VoIP infrastructure:
• Centralized Control: The server provides a central point for managing users, devices, and call routing, simplifying administration.
• Scalability: SIP servers can be scaled to accommodate a growing number of users and call volume.
• Cost-Effectiveness: SIP servers enable efficient call routing, potentially leading to reduced call costs compared to traditional phone lines.
• Integration Capabilities: They can integrate with other communication tools like instant messaging and video conferencing, creating a unified communication platform.
[Mastering OWL 2 Web Ontology Language: From Foundations to Practical Applications](https://www.amazon.com/dp/B0CT93LVJV)
## Deployment Options: Choosing the Right SIP Server
There are several ways to deploy a SIP server:
• On-Premise: Installing and managing the server within your own network offers greater control but requires more technical expertise.
• Hosted: A third-party provider manages the server infrastructure, eliminating maintenance responsibilities but potentially incurring subscription fees.
• Cloud-Based: A variation of hosted SIP servers, cloud-based options offer scalability and flexibility, often with pay-as-you-go pricing models.
The ideal deployment option depends on factors like your organization's size, technical expertise, and budget.
## Beyond the Basics: Advanced SIP Server Features
Modern SIP servers offer a plethora of advanced functionalities:
• Voicemail: Users can store voice messages for retrieval at their convenience.
• Auto attendants: Automated systems can greet callers, direct them to the appropriate extension, or offer self-service options.
• Call recording: Calls can be recorded for training, quality assurance, or compliance purposes.
• Video conferencing integration: SIP servers can integrate with video conferencing platforms for multi-party video calls.
## Conclusion: The Power of the SIP Server
SIP servers play a critical role in the smooth operation of VoIP communication. By understanding their functionalities, benefits, and deployment options, you can leverage the power of SIP to create a robust and efficient communication system for your organization. As technology continues to evolve, SIP servers will undoubtedly adapt and integrate with emerging communication trends, ensuring their continued relevance in the future of VoIP.
| epakconsultant |
1,885,069 | MIMI: Reshaping the DeFi Ecosystem to Build a Secure, Transparent, and Efficient Multi-Chain Investment Platform | In the DeFi field, MIMI is dedicated to providing users with efficient, secure, and transparent... | 0 | 2024-06-12T03:11:16 | https://dev.to/mimi_official/mimi-reshaping-the-defi-ecosystem-to-build-a-secure-transparent-and-efficient-multi-chain-investment-platform-4o9d | In the DeFi field, MIMI is dedicated to providing users with efficient, secure, and transparent financial services. With the rapid development of digital finance, more and more users hope to achieve wealth growth and management by participating in the DeFi ecosystem. Our aim is to ensure that every user, regardless of their capital size, can enjoy the financial benefits brought by DeFi.
Low-Threshold Liquidity Yield Products
Liquidity is a key factor in ensuring the smooth operation of various financial activities within the DeFi ecosystem. In traditional financial markets, only investors with large capital can enjoy high-yield investment opportunities, while small capital users face high entry barriers and low investment returns. MIMI recognizes this market pain point and has launched low-threshold liquidity yield products to provide fair investment opportunities for all users.
Low-threshold liquidity yield products refer to high-yield investment products that users can participate in without investing large amounts of capital. Through these products, users with small capital can also enjoy various financial services within the DeFi ecosystem, including staking, lending, and liquidity mining. This design not only lowers the entry barrier for users but also provides them with considerable investment returns.
At MIMI, users can enjoy services that typically require large stakes in other DeFi platforms, even with small capital, such as:
Convenient User Experience: Users can easily invest small amounts of capital into the platform’s liquidity pool through simple operations, enjoying efficient capital management and returns.
Optimized by Smart Algorithms: We use advanced smart algorithms to automatically adjust fund allocation based on market dynamics and user needs, ensuring users achieve the best investment returns.
Diverse Investment Options: The MIMI platform offers various investment products and services, allowing users to choose investment portfolios that suit their risk preferences and investment goals.
Through these core functions, MIMI not only addresses the challenges faced by small capital users in traditional financial markets but also provides them with a safe, transparent, and efficient investment platform. Our low-threshold liquidity yield products allow every user to easily participate in the DeFi ecosystem and share the benefits of digital finance.
High Returns for Small Capital Users
In the traditional DeFi market, small capital users are often hindered by high initial investment requirements and complex operation processes when trying to participate in high-yield investments. MIMI recognizes this issue and offers a series of innovative solutions to provide small capital users with equal opportunities to participate in high-yield investments.
MIMI provides a low-threshold entry mechanism and multi-chain fund support, allowing users to easily participate in our liquidity pool and other investment products regardless of their capital size. Multi-chain support also allows users to effectively utilize their funds across different chains, accumulating small amounts of capital to generate high returns.
Smart algorithms play a crucial role in optimizing fund allocation. MIMI’s smart algorithms monitor market dynamics in real-time, analyze user behavior and market trends, and automatically adjust fund allocation. This not only ensures efficient utilization of user funds but also enables quick responses to market changes, enhancing investment returns.
Through various efforts, MIMI has successfully provided small capital users with an efficient and secure investment platform, allowing them to enjoy the same investment opportunities and returns as large capital users. This not only enhances user participation and satisfaction but also allows more users to share the financial benefits of the DeFi ecosystem.
Fully Transparent Yield Distribution Mechanism
The yield distribution mechanism is crucial in financial platforms, directly affecting user trust and satisfaction.
A fully transparent yield distribution mechanism means that all operations and data in the yield distribution process are open and transparent. Users can view their investment returns and fund flows in real time. MIMI ensures that every user clearly understands their actual investment returns, enhancing user trust and platform credibility through this mechanism.
The core functions of MIMI’s fully transparent yield distribution mechanism include:
Real-Time Data Disclosure: All yield distribution and fund flow data are publicly recorded on the blockchain, allowing users to view and verify at any time.
Smart Contract Execution: Yield distribution is automatically executed through smart contracts, avoiding human errors and potential unfair practices.
Traceability: The application of blockchain technology ensures that every yield distribution and fund flow is traceable.
Users can confidently invest their funds on the MIMI platform, enjoying efficient and secure investment returns. Our goal is to build a decentralized financial platform that users can trust through transparent and fair yield distribution.
MIMI’s Technological Advantages
MIMI’s low-threshold liquidity yield products not only meet the needs of small capital users in design but also possess significant technological advantages. Through the application of advanced technologies, we ensure that users can invest in a safe and efficient environment.
We use smart algorithms to optimize fund allocation. These algorithms monitor market dynamics and analyze user behavior in real-time, automatically adjusting fund allocation to ensure each investment achieves the best returns. This dynamic optimization mechanism not only improves fund utilization efficiency but also allows users to maintain stable returns amidst market fluctuations.
MIMI also adopts multi-signature and cold wallet storage security measures to further protect user assets. Multi-signature technology ensures that only authorized personnel can operate funds, while cold wallet storage keeps most assets offline, avoiding the risk of hacking attacks.
Through various technological advantages, MIMI provides users with a safe and efficient investment platform, allowing them to invest with confidence and enjoy high returns.
Future Development
MIMI is committed to becoming a global leading decentralized financial platform, continuously innovating and optimizing our services to meet the evolving needs of users. We will continue to invest in cutting-edge technologies, developing more unique financial products and services to maintain our leading position in the DeFi field.
We plan to introduce more financial products and services to further enrich users’ investment choices. We will launch diversified financial products, including stablecoins and index tokens, providing users with more diversified investment strategies. By continuously expanding our product line, we hope to attract more users to join the MIMI platform and enjoy our quality services.
Moreover, MIMI will continuously optimize platform functions to enhance user experience. We will improve the user interface and operation processes based on user feedback, ensuring that every user can easily get started and enjoy a convenient investment experience.
MIMI not only aims to enhance its market competitiveness but also to create more participation opportunities and returns for users. We believe that through continuous efforts and innovation, MIMI can provide users with unprecedented financial service experiences, helping them achieve wealth growth.
 | mimi_official | |
1,885,068 | Lighting the Stage: Mastering Light and Shadow for Stunning 3D Scenes | The magic of 3D graphics lies not just in meticulously crafted models but also in the art of bringing... | 0 | 2024-06-12T03:06:11 | https://dev.to/epakconsultant/lighting-the-stage-mastering-light-and-shadow-for-stunning-3d-scenes-478k | The magic of 3D graphics lies not just in meticulously crafted models but also in the art of bringing them to life with convincing lighting and shading. Just like a well-lit stage elevates a performance, effective lighting techniques can elevate your 3D scenes from sterile to captivating. Let's delve into some key concepts and techniques to illuminate your 3D creations and enhance their visual quality.
## Understanding Light: The Building Blocks
There are three fundamental types of light sources used in 3D rendering:
• Directional lights: Simulate a distant light source like the sun, casting parallel rays and creating strong shadows.
• Point lights: mimic light sources like lamps, emitting light in all directions and causing softer shadows with falloff.
• Spotlights: Replicate focused light sources like spotlights, creating a cone of light with a defined falloff and sharp shadows.
By strategically combining these light types, you can achieve a variety of moods and atmospheres in your scene.
## Shading: The Art of Light Interaction
Shading defines how light interacts with the surfaces of your 3D models. Different materials – like metal, plastic, or wood – reflect light differently. Shading techniques help simulate these material properties:
• Flat shading: Applies a single, uniform color to each polygon of the model, resulting in a flat and unrealistic look.
• Smooth shading: Interpolate colors between vertices, creating smoother transitions and a more realistic appearance.
• Normal mapping: A technique that uses a special texture map to add details like bumps and scratches, enhancing the illusion of surface texture without increasing geometric complexity.
[Demystifying Cybersecurity: Understanding Principles and Technologies
](https://dataprophet.blogspot.com/2024/06/demystifying-cybersecurity.html)
## Advanced Techniques for Enhanced Realism
Once you've grasped the basics, here are some advanced lighting and shading techniques to elevate your scenes:
• Ambient occlusion: Simulates the subtle shadows created by objects blocking indirect light from reaching other surfaces, adding depth and realism.
• Global illumination: A complex technique that realistically simulates the interaction of light bouncing off various surfaces within the scene, creating a more natural and nuanced lighting effect.
• HDRI (High Dynamic Range Image) lighting: Uses an HDRI image environment map to illuminate the scene with realistic lighting information from the environment, including reflections and indirect light.
[Flutter Mobile App Development: A Beginner's Guide to Creating Your First App](https://www.amazon.com/dp/B0CTHQ9YGB)
## Composition and Storytelling with Light
Lighting isn't just about technical accuracy; it's a powerful storytelling tool. Here's how to use light strategically:
• Highlight key elements: Use light to draw the viewer's eye to the focal point of your scene.
• Create mood and atmosphere: Warm lighting evokes a sense of comfort, while cool lighting can create a more suspenseful mood.
• Simulate natural light: Observe how light behaves in the real world and replicate it in your scene for added realism.
## Experimentation is Key
The key to mastering lighting and shading is experimentation. Play with different light source types, intensities, positions, and experiment with various shading techniques. Render test scenes to see how adjustments impact the overall look and feel. There's no one-size-fits-all approach – the best lighting setup depends on the specific scene and the desired mood.
## Leveraging Software Tools
Most 3D rendering software offers a vast array of lighting and shading tools. Here are some helpful features:
• Light properties: Adjust light source intensity, color, falloff, and shadow properties.
• Material editors: Define material properties like reflectivity, roughness, and textures, influencing how light interacts with the surface.
• Render settings: Control aspects like global illumination and anti-aliasing for more realistic and smoother rendering.
By familiarizing yourself with these tools and exploring their capabilities, you'll gain greater control over the lighting and shading in your 3D scenes.
## Conclusion: Lighting the Path to Success
Effective lighting and shading breathe life into your 3D creations, transforming sterile models into captivating scenes. By understanding the core concepts, exploring advanced techniques, and experimenting with your software tools, you can illuminate your scenes with stunning visuals that tell a compelling story. So, unleash your creativity, embrace the power of light and shadow, and watch your 3D worlds come alive!
| epakconsultant | |
1,885,067 | Effortless User Management with AWS Cognito | Effortless User Management with AWS Cognito In today's digital landscape, applications... | 0 | 2024-06-12T03:02:26 | https://dev.to/virajlakshitha/effortless-user-management-with-aws-cognito-377j | 
# Effortless User Management with AWS Cognito
In today's digital landscape, applications are increasingly reliant on robust and secure user management systems. From handling user authentication and authorization to managing user profiles and data, developers need a reliable solution that simplifies these complexities. This is where AWS Cognito steps in as a powerful and versatile service designed to streamline user management for web and mobile applications.
### Introduction to AWS Cognito
AWS Cognito is a fully managed identity service that provides user sign-up, sign-in, and access control for your web and mobile applications. It eliminates the need for you to build, manage, and scale your own user management infrastructure, freeing you to focus on your core application development.
**Key Features of AWS Cognito:**
* **User Authentication:** Securely authenticate users through various methods like username/password, social logins (Google, Facebook, Amazon, etc.), and enterprise identity providers (SAML, OIDC).
* **User Pools:** Create and manage your own user directories with customizable attributes and password policies.
* **Identity Pools:** Grant your users access to other AWS services (like S3, DynamoDB, API Gateway) based on their identity and permissions.
* **Security & Compliance:** Cognito is built with security as a top priority. It supports multi-factor authentication (MFA), encryption of data at rest, and compliance with industry standards such as HIPAA, GDPR, and PCI DSS.
* **Scalability and Performance:** Being a fully managed service, Cognito scales automatically with your user base, ensuring high performance and availability.
### Five Compelling Use Cases for AWS Cognito
Let's explore how AWS Cognito addresses various real-world scenarios:
**1. Building a Secure E-commerce Platform**
**The Challenge:** Imagine building an online store where customers can browse products, place orders, and manage their accounts. You need a secure system to handle user registration, login, and protect sensitive customer data.
**The Cognito Solution:**
* **User Pools:** Create a user pool to store customer usernames, passwords, and other relevant information like shipping addresses and payment details.
* **MFA:** Enhance security by enabling multi-factor authentication for an additional layer of protection against unauthorized account access.
* **Data Encryption:** Cognito encrypts sensitive customer data at rest, ensuring that it remains confidential and secure.
**2. Creating a Serverless Mobile App**
**The Challenge:** You're building a mobile app that relies heavily on backend services, and you want to offload authentication and authorization to a serverless solution.
**The Cognito Solution:**
* **Social Logins:** Allow users to sign in seamlessly using their existing social media accounts, enhancing the user experience.
* **AWS Lambda Integration:** Use Cognito triggers with Lambda functions to execute custom logic during user sign-up or sign-in processes (e.g., sending welcome emails).
* **Identity Pools & API Gateway:** Securely authorize access to your backend APIs and resources using identity pools and API Gateway, granting users granular access based on their roles.
**3. Enabling Single Sign-On (SSO) for an Enterprise**
**The Challenge:** A large organization wants to implement single sign-on (SSO), allowing employees to access multiple internal applications with a single set of credentials.
**The Cognito Solution:**
* **SAML and OIDC Support:** Integrate Cognito with your existing identity provider using SAML 2.0 or OpenID Connect (OIDC) protocols to enable SSO.
* **Directory Synchronization:** Synchronize user accounts from your on-premises Active Directory or other directory services to Cognito user pools.
* **Customizable Attributes:** Leverage custom attributes to store role-based access control (RBAC) information within Cognito, controlling access to applications based on user roles.
**4. Personalizing Content in a Media Streaming Service**
**The Challenge:** You're building a video streaming service and want to provide personalized recommendations, watchlists, and user profiles.
**The Cognito Solution:**
* **User Profiles:** Store user preferences, watch history, and other relevant data within user profiles to power personalized recommendations.
* **Synchronized Data:** Keep user data consistent across multiple devices by leveraging Cognito Sync, which allows offline access and data synchronization.
* **Fine-Grained Authorization:** Use identity pools to control access to premium content or features based on user subscription levels.
**5. Protecting IoT Device Data**
**The Challenge:** You're deploying thousands of IoT devices and need a way to securely authenticate and authorize these devices to access your cloud backend.
**The Cognito Solution:**
* **Machine-to-Machine (M2M) Authentication:** Use Cognito identity pools to provide temporary AWS credentials to your devices, allowing them to interact with other AWS services like IoT Core and S3 for data storage.
* **Certificate-Based Authentication:** Enhance security by implementing certificate-based authentication for your devices, verifying their identity before granting access.
* **Revoke Access:** Easily revoke access for compromised or malfunctioning devices to prevent unauthorized data access.
### Alternative Identity Management Solutions
While Cognito offers a comprehensive solution, it's helpful to be aware of other popular identity management options:
* **Auth0:** A popular cloud-based identity platform that provides similar features to Cognito, including social logins, MFA, and enterprise integrations.
* **Okta:** Another leading identity provider known for its robust SSO capabilities, extensive directory integration options, and advanced security features.
* **Firebase Authentication:** Google's mobile and web application development platform includes built-in authentication features, making it a suitable option for projects already using Firebase.
**Key Considerations When Choosing an Identity Solution:**
* **Features and Integrations:** Evaluate whether the platform offers the specific authentication methods, integrations, and customization options required for your application.
* **Scalability and Performance:** Ensure the solution can handle your expected user base and traffic without compromising performance.
* **Security and Compliance:** Prioritize solutions with robust security features like MFA, data encryption, and compliance certifications.
* **Pricing:** Understand the pricing structure and calculate the total cost of ownership based on your usage patterns.
### Conclusion
AWS Cognito simplifies user management, allowing developers to build secure and scalable applications without the complexities of managing their own identity infrastructure. From basic authentication to advanced use cases like SSO, personalized experiences, and IoT security, Cognito offers a comprehensive suite of features to meet diverse application needs. By offloading user management to this fully managed service, developers can focus on building innovative features and delivering exceptional user experiences.
---
## Advanced Use Case: Building a Microservices-Based Platform with Secure Communication
**As a Software Architect and AWS Solution Architect, here's an advanced use case for leveraging AWS Cognito:**
**Scenario:** Design a microservices-based platform where different services need to communicate securely with each other while authenticating and authorizing requests from users and other services.
**Solution:**
**Components:**
* **AWS Cognito:** Manage user identities, issue access tokens (JWTs), and handle authentication.
* **Amazon API Gateway:** Create a unified entry point for all API requests, handle request routing, and enforce security policies.
* **AWS Lambda:** Implement individual microservices as serverless functions.
* **Amazon Cognito Authorizer:** Configure API Gateway to use Cognito authorizers to validate access tokens and enforce authorization policies for API access.
* **AWS Secrets Manager:** Securely store sensitive information, such as database credentials, used by Lambda functions.
**Architecture:**
1. **User Authentication:** Users authenticate with Cognito, receiving an access token (JWT) upon successful authentication.
2. **API Gateway as Entry Point:** All API requests are routed through API Gateway.
3. **Cognito Authorizer:** API Gateway uses a Cognito authorizer to validate the access token presented in the request header.
4. **Authorization & Routing:** Based on the token's claims (user roles, permissions), the Cognito authorizer either allows or denies access to the requested resource. If authorized, API Gateway routes the request to the appropriate Lambda function.
5. **Microservice Execution:** The Lambda function receives the request, processes it (potentially accessing resources like databases or other services), and returns a response to API Gateway.
6. **Secure Communication Between Services:** Microservices can communicate securely with each other using AWS IAM roles and policies. Each service assumes an IAM role that grants it permission to access the resources it needs.
**Benefits:**
* **Enhanced Security:** Centralized identity management, token-based authentication, and fine-grained authorization policies ensure secure communication and access control.
* **Decoupled Architecture:** Microservices can evolve independently and scale horizontally, enhancing flexibility and agility.
* **Simplified Development:** Cognito and API Gateway streamline authentication and authorization processes, reducing development complexity.
* **Improved Performance:** Serverless architecture with Lambda provides automatic scaling and efficient resource utilization.
**References:**
* [AWS Cognito Documentation](https://aws.amazon.com/cognito/)
* [Amazon API Gateway Documentation](https://aws.amazon.com/api-gateway/)
* [AWS Lambda Documentation](https://aws.amazon.com/lambda/)
* [AWS Secrets Manager Documentation](https://aws.amazon.com/secrets-manager/) | virajlakshitha | |
1,885,066 | Unveiling the Magic: A Dive into 3D Graphics Concepts and Techniques | The world of 3D graphics has become ubiquitous, from captivating video games and blockbuster movies... | 0 | 2024-06-12T03:01:27 | https://dev.to/epakconsultant/unveiling-the-magic-a-dive-into-3d-graphics-concepts-and-techniques-1lho | 3d, graphics, webdev | The world of 3D graphics has become ubiquitous, from captivating video games and blockbuster movies to stunning architectural visualizations and even medical simulations. But what brings these three-dimensional worlds to life? Let's delve into some fundamental concepts and techniques that underpin the magic of 3D graphics.
## Building Blocks: 3D Models and Geometry
At the heart of 3D graphics lie 3D models. These digital representations of objects define their shape and structure. Imagine building blocks – 3D models are constructed using geometric primitives like points, lines, and polygons (especially triangles). By combining these primitives, complex objects and scenes are created.
## Shaping Reality: Modeling Techniques
There are several ways to create 3D models:
• Polygon modeling: This traditional approach involves manipulating vertices (points) and edges to define the shape of an object.
• Sculpting: Similar to working with clay, digital sculpting tools allow for intuitive shaping and detailing of 3D models.
• Procedural modeling: Here, algorithms generate the model based on defined parameters, useful for creating repetitive elements like terrain or foliage.
[Building CRUD Powerhouses: Lambda Functions for DynamoDB Operations
](https://cloud-computing-for-beginner.blogspot.com/2024/05/building-crud-powerhouses-lambda.html)
## Texturing: Adding Skin to the Model
A 3D model by itself is just a geometric shell. To bring it to life, textures are applied. Textures are essentially digital images wrapped around the model, defining its surface details like color, patterns, and textures (think of a brick wall or a character's skin).
## Lighting Up the Scene: Illumination and Shading
Imagine a world without light – everything would be flat and lifeless. Similarly, in 3D graphics, lighting plays a crucial role. By simulating light sources like virtual suns, lamps, or spotlights, realistic shadows and highlights are created, adding depth and dimension to the scene.
Shading techniques further define how light interacts with the surfaces of objects, influencing their perceived material properties.
## Rendering: The Final Act
Once the 3D scene is built, with models, textures, and lighting defined, it's time to render it. Rendering is the process of converting all this information into a final image or animation. Rendering software performs complex calculations to simulate how light bounces off objects, creating a realistic representation of the scene.
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## Advanced Techniques for Enhanced Realism
The world of 3D graphics offers a vast array of advanced techniques to push the boundaries of realism:
• Animation: Bringing 3D models to life through animation techniques allows for the creation of dynamic and engaging visuals.
• Ray tracing: This advanced rendering technique simulates the true path of light, resulting in incredibly realistic lighting effects with accurate shadows and reflections.
• Particle systems: These techniques create simulations of natural phenomena like smoke, fire, or explosions, adding dynamism to the scene.
## Beyond the Basics: Applications of 3D Graphics
3D graphics aren't just about creating visually stunning experiences. They have a wide range of applications across various industries:
• Video Games: The foundation of immersive gaming experiences, 3D graphics bring characters, environments, and objects to life.
• Film and Animation: Breathtaking visuals and captivating characters in movies and animation are often powered by 3D graphics technology.
• Architecture and Engineering: 3D modeling allows architects and engineers to create virtual models of buildings and structures for design visualization and planning.
• Product Design: 3D models are used to design and prototype products
before physical manufacturing begins.
## The Future of 3D Graphics: A World of Possibilities
The field of 3D graphics is constantly evolving. Advancements in areas like real-time rendering, virtual reality, and artificial intelligence promise even more immersive and interactive experiences in the future. Whether it's exploring virtual worlds, designing the next generation of products, or pushing the boundaries of cinematic storytelling, 3D graphics will continue to play a pivotal role in shaping the visual landscape of the future.
This glimpse into the world of 3D graphics concepts and techniques equips you with a foundational understanding of this fascinating realm. As technology progresses, the possibilities for creating ever-more realistic and engaging 3D experiences are truly limitless.
| epakconsultant |
1,885,065 | The Orchestra of Industry: PLCs, HMIs, and SCADA Systems in Manufacturing | Manufacturing today is a symphony of automation, where machines and computer systems work in concert... | 0 | 2024-06-12T02:53:07 | https://dev.to/epakconsultant/the-orchestra-of-industry-plcs-hmis-and-scada-systems-in-manufacturing-2pd2 | manufacturing | Manufacturing today is a symphony of automation, where machines and computer systems work in concert to produce goods efficiently and precisely. Three key technologies play a vital role in conducting this industrial orchestra: Programmable Logic Controllers (PLCs), Human-Machine Interfaces (HMIs), and Supervisory Control and Data Acquisition (SCADA) systems. Let's delve into each of these and understand how they work together to keep the wheels of production turning.
## The Maestro: The Programmable Logic Controller (PLC)
Imagine the brain of a machine; that's essentially what a PLC is. It's a ruggedized computer specifically designed for the industrial environment. PLCs receive input from sensors and switches monitoring real-time conditions like temperature, pressure, or motor status. Based on pre-programmed logic, the PLC makes decisions and sends output signals to control actuators, valves, or robots, automating various aspects of the manufacturing process.
Here's what makes PLCs stand out:
• Real-time control: PLCs excel at making quick decisions based on real-time sensor data, ensuring precise control over industrial machinery.
• Reliability: Built to withstand harsh industrial environments with factors like dust, vibration, and extreme temperatures, PLCs are known for their reliability.
• Programmability: The core logic of a PLC can be easily modified to adapt to changing production requirements.
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## The Conductor: The Human-Machine Interface (HMI)
While the PLC acts as the brain, the HMI serves as the eyes and ears of the manufacturing process. It's a computer interface that provides operators with a visual representation of the production line. Think of it as a control panel displaying real-time data, trends, and alarms. Here are some key HMI functionalities:
• Monitoring: Operators can monitor various parameters like machine status, production output, and potential issues through the HMI.
• Control: Basic control functions like starting or stopping machines, adjusting parameters, and initiating pre-defined actions can be performed through the HMI.
• Data logging and visualization: HMIs can record and display historical data, enabling operators to analyze trends and identify potential problems.
The Overseer: The Supervisory Control and Data Acquisition (SCADA) System
Imagine a central command center overseeing a vast network of PLCs and HMIs. That's the role of a SCADA system. It acts as a supervisory layer, collecting data from multiple PLCs and HMIs across a factory floor. SCADA systems offer a broader perspective and advanced functionalities:
• Centralized monitoring and control: Operators can monitor the entire production process from a central location, providing a holistic view and enabling informed decision-making.
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• Data acquisition and analysis: SCADA systems collect and analyze vast amounts of data from PLCs and HMIs, providing valuable insights into production efficiency, potential issues, and areas for improvement.
• Alarming and reporting: SCADA systems can trigger alarms for critical events or equipment malfunctions, allowing for timely intervention. Additionally, they can generate reports for production analysis and optimization.
## The Symphony in Action: Collaboration for Efficiency
These three technologies work together seamlessly to orchestrate a smooth and efficient production process. Here's a glimpse into their collaboration:
• PLCs handle real-time control: They receive sensor data and make split-second decisions to control machinery.
• HMIs provide operator interface: Operators interact with the process through the HMI, monitoring data and controlling basic functions.
• SCADA supervises and analyzes: The SCADA system collects data from PLCs and HMIs, providing a broader view for centralized monitoring, analysis, and control.
## The Benefits of the Industrial Orchestra
The integration of PLCs, HMIs, and SCADA systems offers numerous advantages for manufacturers:
• Increased productivity: Automation and improved decision-making lead to faster production cycles and higher output.
• Enhanced quality: Precise control and real-time monitoring ensure consistent product quality.
• Reduced costs: Minimized downtime, improved efficiency, and preventive maintenance through data analysis lead to cost savings.
• Improved safety: Automated processes and real-time monitoring can help mitigate safety risks in the manufacturing environment.
## Conclusion
PLCs, HMIs, and SCADA systems are the cornerstones of modern manufacturing automation. By working together, they create a symphony of efficiency, quality, and safety on the factory floor. As technology continues to evolve, these systems will undoubtedly become even more sophisticated, further optimizing and revolutionizing the manufacturing landscape.
| epakconsultant |
1,885,064 | JewelryOnLight | []( ) | 0 | 2024-06-12T02:52:05 | https://dev.to/lan_wang_1f9538b9feb11979/jewelryonlight-45d0 | earrings, bracelets |
[](
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| lan_wang_1f9538b9feb11979 |
1,885,063 | JewelryOnLight | A post by lan wang | 0 | 2024-06-12T02:50:37 | https://dev.to/lan_wang_1f9538b9feb11979/jewelryonlight-2o8m | earrings, bracelets |
| lan_wang_1f9538b9feb11979 |
1,885,061 | The current Lakehouse is like a false proposition | From all-in-one machine, hyper-convergence, cloud computing to HTAP, we constantly try to combine... | 0 | 2024-06-12T02:50:06 | https://dev.to/esproc_spl/the-current-lakehouse-is-like-a-false-proposition-2le4 | lackhouse, bigdata, development, programming | From all-in-one machine, hyper-convergence, cloud computing to HTAP, we constantly try to combine multiple application scenarios together and attempt to solve this type of problem through one technology so as to achieve the goal of simple and efficient use. Lakehouse, which is very hot nowadays, is exactly such a technology; its goal is to integrate the data lake with the data warehouse to give play to their respective value at the same time.
The data lake and data warehouse have always been related closely, yet there are significant differences between them. The data lake pays more attention to retaining the original information, and its primary goal is to store the raw data “as is”. However, there are a lot of junk data in the raw data. Does storing the raw data “as is” mean that all the junk data will be stored in data lake? Yes, the data lake is just like a junk data yard where all the data is stored, regardless of whether they are useful or not. Therefore, the first problem that the data lake faces is the storage of massive (junk) data.
Benefiting from the considerableprogress of modern storage technology, the cost of storing massive data is reduced dramatically. For example, using the distributed file system can fully meet the storage needs of data lake. But, the data storing ability alone is not enough, the computing ability is also required to bring the value into play. Data lake stores various types of data and each is processed differently, and the structured data processing is of the highest degree of importance. Whether it is historical data or newly generated business data, data processing mainly focuses on structured data. On many occasions, computations of semi-structured data and unstructured data will eventually be transformed to structured data computation. Unfortunately, however, since the storage schema itself (file system) of data lake does not have the computing ability, it is impossible to process the data directly on the data lake. To process the data, you have to use other technologies (such as data warehouse). The main problem that data lake is facing is “capable of storing, but incapable of computing”.
For the data warehouse, it is just the opposite. Data warehouse is based on SQL system, and often has powerful ability to calculate the structured data. However, only after the raw data are cleansed, transformed and deeply organized until they meet database’s constraints can they be loaded into the data warehouse. In this process, a large amount of original information will be lost, even the data granularity will become coarse, resulting in a failure of obtaining the value of data with lower granularity. Moreover, the data warehouse is highly subject-oriented, and services one or a few subjects only. Since the data outside the subjects is not the target of data warehouse, it will make the range of usable data relatively narrow, making it unable to explore the value of full and unknown data as data lake does, let alone store massive raw data like data lake. Compared with data lake, the data warehouse is “capable of computing, but incapable of storing”.
From the point of view of data flow, the data of data warehouse can be organized based on data lake, so a natural idea is to integrate the data lake with the data warehouse to achieve the goal of “capable of storing and computing”, which is the so-called “Lakehouse”.
So, what is current implementing situation?
The current method is oversimplified and crude, that is, open the data access rights on the data lake to allow the data warehouse to access the data in real-time (the so-called real-time is relative to the original ETL process that needs to periodically move the data from data lake to data warehouse. Yet, there is still a certain delay in practice). Physically, the data are still stored in two places, and the data interaction is performed through high-speed network. Due to having a certain ability to “real time” process the data of data lake, the implementation result (mostly at the architecture level) is now called Lakehouse.
That’s it? Is that a Lakehouse in the true sense?
Well, I have to say - as long as the one (who claims it is Lakehouse) doesn’t feel embarrassed, embarrassing is as the one (who knows what Lakehouse should be like) feels embarrassed.
Then, how does the data warehouse read the data of data lake? A common practice is to create an external table/schema in the data warehouse to map RDB’s table, or schema, or hive’s metastore. This process is the same as the method that a traditional RDB accesses the external data through external table. Although the metadata information is retained, the disadvantages are obvious. Specifically, it requires the data lake can be mapped as tables and schema under corresponding relational model, and it also needs to organize the data before computing them. Moreover, the types of available data sources decrease (for example, we cannot perform mapping directly based on NoSQL, text, and Webservice). Furthermore, even if there are other data sources (such as RDB) available for computation in the data lake, the data warehouse usually needs to move the data to its local position when computing (such as grouping and aggregating), resulting in a high data transmission cost, performance drop, and many problems.
For the current Lakehouse, in addition to “real-time” data interaction, the original channel for periodically organizing the data in batches is still retained. In this way, the organized data of data lake can be stored into the data warehouse for local computing. Of course, this has little to do with the Lakehouse, because it was done the same way before the “integration”.
Anyway, both the data lake and data warehouse change little (only the data transmission frequency is improved, but many conditions have to be met), whether the data is transmitted from lake to warehouse through traditional ETL or external real-time mapping. Physically, the data are still stored in two places. The data lake is still the original data lake, and the warehouse is still the original data warehouse, and they are not integrated essentially!Consequently, not only are the data diversity and efficiency problems not fundamentally solved (lack of flexibility), but it also needs to organize the “junk” data of data lake first, and then load them into the warehouse before computing (poor real time performance). If you want to build a real-time and efficient data processing ability on the data lake through the “Lakehouse” implemented in this way, I'm afraid it's a joke.
Why?
If we think a little, we will find that the problem is in the data warehouse. The database system is too closed and lacks openness, it needs to load the data into the database (including external data mapping) before computing. Moreover, due to the database constraints, the data must be deeply organized to conform to the norms before being loaded into the database, while the raw data itself of data lake has a lot of “junk” data. Although it is reasonable to organize these data, it is difficult to respond to the real-time computing needs of data lake. If the database is open enough, and has the ability to directly calculate the unorganized data of data lake, and even the ability to perform mixed computing based on a variety of different types of data sources, and provide a high-performance mechanism to ensure the computing efficiency at the same time, then it is easy to implement a real Lakehouse. However, it is a pity that the database is unable to achieve this goal.
Fortunately, esProc SPL does.
SPL - an open computing engine - helps implement a real Lakehouse
The open-source SPL is a structured data computing engine that provides open computing power for data lake, which can directly calculate the raw data of data lake, there are no constraints, even no database to store the data. Moreover, SPL boasts the mixed computing ability for diverse data sources. Whether the data lake is built on a unified file system, or based on diverse data sources (RDB, NoSQL, LocalFile, Webservice), a direct mixed computing can be accomplished in SPL, and the value of data lake can be produced quickly. Furthermore, SPL provides a high-performance file storage (the storage function of data warehouse).The data can be organized unhurriedly when calculations are going on in SPL, while loading the raw data into SPL’s storage can obtain higher performance. Particular attention should be paid that the data are still stored in the file system after they are organized in SPL storage, and theoretically, they can be stored in the same place with the data lake. In this way, a real Lakehouse can be implemented.
In the whole architecture, SPL can perform unified storage and calculation directly based on data lake, and can also connect to diverse data sources in the data lake, and even directly read the external production data source. With these abilities, a real-time calculation on the data lake can be implemented, and in some scenarios that require high data timeliness (it needs to use the data before they are stored into the data lake), SPL can connect to the real-time data source, so the data timeliness is higher.
The original way that moves the data from the data lake to data warehouse can still be retained. ETLing the raw data to SPL’s high-performance storage can achieve a higher computing performance. Meanwhile, using the file system to store the data enables the data to be distributed on the SPL server (storage) or, alternatively, we can still use the unified file of data lake to store the data, that is, the work of original data warehouse is completely taken over by SPL. As a result, the Lakehouse is implemented in one system.
Let's take a look at these abilities of SPL.
Open and all-around computing power
Diverse-source mixed computing ability
SPL supports various data sources, including RDB, NoSQL, JSON/XML, CSV, Webservice, etc., and has the ability to perform mixed computation between different sources. This enables direct use of any type of raw data stored in the data lake and gives play to the value of data without transforming the data, and the action of “loading into the database” is omitted. Therefore, the flexible and efficient use of data is ensured, and a wider range of business requirements is covered.
With this ability, the data lake will be able to provide data service for applications as soon as it is established rather than having to complete a prolonged cycle of data preparation, loading and modeling. Moreover, the SPL-based data lake is more flexible, and can provide a real time response based on business needs.
Supporting file computing
Particularly, SPL’s good support for files gives powerful computing ability to them. Storing lake data in a file system can also obtain computing power nearly as good as, even greater than, the database capability. Besides text files, SPL can also handle the data of hierarchical format like JSON, and thus the data stored in NoSQL and RESTful can be used directly without transformation. It’s really convenient.
All-around computing capacity
SPL provides all-around computational capability. The discrete data set model (instead of relational algebra) it is based arms it with a complete set of computing abilities as SQL has. Moreover, with agile syntax and procedural programming ability, data processing in SPL is simpler and more convenient than in SQL.
Rich computing library of SPL
This enables the data lake to fully has the computing ability of data warehouse, achieving the first step of integrating data lake with data warehouse.
Accessing source data directly
SPL’s open computing power extends beyond data lake. Generally, if the target data isn’t synchronized from the source into the lake but is needed right now, we have no choice but to wait for the completion of synchronization. Now with SPL, we can access the data source directly to perform computations, or perform mixed computations between the data source and the existing data in the lake. Logically, the data source can be treated as part of the data lake to engage in the computation so that higher flexibility can be achieved.
High-performance computations after data organization
In addition to its own all-around and powerful computing abilities, SPL provides file-based high-performance storage. ETLing raw data and storing it in SPL storage can achieve higher performance. What’s more, the file system has a series of advantages like flexible to use and easy to parallelly process. Having the data storage ability is equivalent to achieving the second step of integrating the data lake with data warehouse, and a new open and flexible data warehouse is formed.
Currently, SPL provides two high-performance file storage formats: bin file and composite table. The bin file adopts the compression technology (faster reading due to less space occupation,), stores the data types (faster reading due to no need to parse the data type), and supports the double increment segmentation mechanism that can append the data. Since it is easy to implement parallel computing by using the segmentation strategy, computing performance is ensured. The composite table supports columnar storage, this storage schema has great advantage in scenarios where only a very small number of columns (fields) are involved. In addition, the composite table implements the minmaxindex and supports double increment segmentation mechanism, therefore, it not only enjoys the advantages of columnar storage, but also makes it easier to perform the parallel computing to improve the performance.
Furthermore, it is easy to implement parallel computing in SPL and fully bring into play the advantage of multiple CPUs. Many SPL functions, like file retrieval, filtering and sorting, support parallel processing. It is simple and convenient for them to automatically implement the multithreaded processing only by adding the @moption. They support writing parallel program explicitly to enhance computing performance.
In particular, SPL supports a variety of high-performance algorithms SQL cannot achieve. For example, the common TopN operation is treated as an aggregation operation in SPL, as a result, a high-complexity sorting operation can be transformed to a low-complexity aggregation operation while extending the range of application.
In these statements, there are no any sort-related keywords and will not trigger a full sorting action. The statements for getting top N from a whole set and from grouped subsets are basically the same and both can achieve a higher performance. SPL boasts many more such high-performance algorithms.
Depending on these mechanisms, SPL can achieve a performance that surpasses that of traditional data warehouse, the degree of surpassing is measured in orders of magnitude, and the full implementation of Lakehouse in data lake is not done in words but effective mechanisms.
Furthermore, SPL can perform mixed computations on transformed data and raw data to give full play to the value of various types of data, instead of preparing data in advance. In this way, not only is the flexibility of data lake fully expanded, but it also has the function of real-time data warehouse. This achieves the third step of integrating the data lake with data warehouse, which takes into account both the flexibility and high performance.
Through the above three steps, the path to build the data lake is improved (the original path needs to load and transform the data before computing), and the data preparation and computation can be carried out at the same time, and the data lake is built step by step. Moreover, in the process of building the data lake, the data warehouse is perfected, making the data lake has powerful computing ability, implementing the real Lakehouse. This is the correct method for implementing a real Lakehouse.
| esproc_spl |
1,885,060 | Demystifying Game Development: A Look at Frameworks Like Pygame | Crafting a captivating game requires juggling various elements – graphics, sound, physics, user... | 0 | 2024-06-12T02:47:15 | https://dev.to/epakconsultant/demystifying-game-development-a-look-at-frameworks-like-pygame-2hfg | pygame | Crafting a captivating game requires juggling various elements – graphics, sound, physics, user input, and more. Game development frameworks come to the rescue, providing a foundation upon which you can build your interactive masterpiece. This article delves into the core concepts of frameworks like Pygame, equipping you with the knowledge to embark on your game development journey.
## The Framework Advantage
Imagine building a house – you wouldn't start by crafting your own bricks, right? Game development frameworks operate similarly. Instead of reinventing the wheel for core functionalities like drawing graphics or handling user input, frameworks provide pre-built tools and libraries. This allows you to focus on the creative aspects – the game's mechanics, story, and art style – while the framework takes care of the technical groundwork.
[Streamlining Security: Optimizing CPU and Memory Usage for HTTPS Traffic
](https://cloudbelievers.blogspot.com/2024/06/streamlining-security-optimizing-cpu.html)
## Pygame: A Beginner's Ally
Pygame serves as an excellent entry point for aspiring game developers, particularly those familiar with Python. Here's a breakdown of its key features:
• Simplicity: Pygame boasts a clear and concise API (Application Programming Interface), making it relatively easy to learn compared to lower-level libraries.
• 2D Focus: Primarily designed for 2D game development, Pygame offers functionalities for creating sprites (2D images), handling animation, and rendering graphics on the screen.
• Cross-Platform Compatibility: A major perk of Pygame is its ability to run on various operating systems – Windows, macOS, and Linux – without significant code modifications. This allows you to develop your game once and deploy it across different platforms.
[How To Create an Automated Trading Bot for PancakeSwap ](https://www.amazon.com/dp/B0CP2XMSXJ)
## Core Concepts Explained
Let's explore some fundamental concepts you'll encounter when using Pygame:
• Game loop: The heart of any game, the game loop is a continuous process that keeps the game running smoothly. It typically involves handling user input, updating game objects, redrawing the screen, and repeating.
• Sprites: These are the visual building blocks of your game – characters, objects, and backgrounds. Pygame allows you to load images and manipulate them on the screen.
• Events: Events represent user interactions like key presses, mouse clicks, and joystick movements. Pygame provides mechanisms to capture these events and react accordingly within your game logic.
• Collisions: A crucial aspect for many games, collision detection determines when objects come into contact. Pygame offers tools to check for collisions between sprites, enabling you to implement game mechanics like enemy encounters or item pickups.
## Beyond the Basics
While Pygame excels at 2D game development, it offers additional functionalities:
• Sound: Pygame allows you to incorporate sound effects and background music, adding another layer of immersion to your game.
• Text: Overlaying text on the screen is essential for displaying scores, health bars, or dialogue boxes. Pygame provides tools for rendering text in various fonts and sizes.
## Beyond Pygame: A Glimpse into the Game Dev Landscape
Pygame is a fantastic starting point, but the world of game development frameworks is vast. Here's a quick peek at some alternatives:
• Unity: A popular choice for both 2D and 3D games, Unity offers a comprehensive suite of tools and a visual editor, making it user-friendly for beginners.
• Godot: Another open-source contender, Godot is gaining traction for its feature set and focus on 2D development.
• Unreal Engine: A powerhouse often associated with AAA titles, Unreal Engine caters to complex 3D games and boasts stunning visuals.
## The Final Level: Getting Started
So, you're ready to embark on your game development adventure? Here are some parting tips:
• Start small: Begin with a simple game concept to grasp the core mechanics before tackling more ambitious projects.
• Practice consistently: The more you code and experiment, the more comfortable you'll become with the framework and game development in general.
• Embrace the community: There's a wealth of online resources available, from tutorials to forums. Don't hesitate to seek help and learn from others.
With dedication and the right framework by your side, you'll be well on your way to developing captivating games and bringing your interactive visions to life.
| epakconsultant |
1,885,059 | Automating Excel with Power: Building Your Own Plugin using VBA | Microsoft Excel is a powerhouse for data analysis and manipulation. But wouldn't it be great to... | 0 | 2024-06-12T02:41:11 | https://dev.to/epakconsultant/automating-excel-with-power-building-your-own-plugin-using-vba-23fk | vba | Microsoft Excel is a powerhouse for data analysis and manipulation. But wouldn't it be great to extend its capabilities with custom tools tailored to your specific needs? Enter VBA, or Visual Basic for Applications. VBA allows you to write macros and plugins that automate repetitive tasks and enhance Excel's functionality.
This article equips you with the basics of developing an Excel plugin using VBA. We'll delve into the essential steps, explore resources to empower your journey, and provide some guiding principles.
Step 1: Define Your Plugin's Purpose
The first step is to clearly define what your plugin will do. What tasks do you want to automate? Will it be a custom function, a user interface element like a button, or something more complex? Having a clear objective will guide your development process.
[Streamlining Fulfillment: Integrating Shopify Apps with Transport Management Systems](https://nocodeappdeveloper.blogspot.com/2024/06/streamlining-fulfillment-integrating.html)
Step 2: Embrace the VBA Editor
Fire up Excel and navigate to the Developer tab (it might be hidden by default, you can enable it in the settings). Here lies the VBA editor, your coding playground. Here you can write VBA code to interact with Excel's objects and functionalities.
Step 3: Building Blocks: Subroutines and Functions
VBA code is structured using subroutines and functions. Subroutines perform actions without returning a value, while functions return a specific output. For instance, a subroutine might format a range of cells, while a function might calculate the average of a data set.
Step 4: Harnessing Excel's Objects
The magic of VBA lies in its ability to interact with Excel's objects. These objects represent elements within the spreadsheet, like worksheets, cells, ranges, charts, and more. VBA provides a vast library of properties and methods to manipulate these objects. For example, the Range object allows you to set cell values, apply formatting, and perform various operations on data.
Step 5: User Interaction: Forms and Dialogs
VBA allows you to create user interfaces (UIs) within Excel. You can design custom dialog boxes with buttons, text boxes, and dropdown lists to interact with users. This empowers you to collect input or display information for a more user-friendly experience.
Step 6: Deployment and Security Considerations
Once your plugin is functional, you can save it as an Excel Add-In (.xlam file). This allows you to activate and utilize the plugin within Excel. Keep in mind security practices. VBA code can potentially contain malicious elements, so only use plugins from trusted sources.
[A Beginners Guide to Integrating ChatGPT into Your Chatbot](https://www.amazon.com/dp/B0CNZ1T4WX)
## Learning Resources:
The world of VBA is vast, but fret not! There are numerous resources available to equip you on your journey. Here are a few to get you started:
• Microsoft VBA Documentation: Microsoft provides comprehensive documentation for VBA, covering all its functionalities and object models (https://learn.microsoft.com/en-us/office/vba/api/overview/excel)
• Online Tutorials: A plethora of online tutorials exist, offering step-by-step guides on building various VBA plugins. Explore platforms like YouTube and Udemy for video tutorials.
• Books: Numerous books cater to varying VBA skill levels. Look for beginner-friendly titles that introduce concepts and provide practical examples.
## Remember:
• Start small. Begin with basic plugins to gain confidence before venturing into more complex functionalities.
• Practice makes perfect! The more you code, the better you'll understand VBA's nuances.
• Don't be afraid to experiment. Explore the different libraries and objects available within VBA.
• The VBA community is vast and helpful. Don't hesitate to seek help on online forums if you get stuck.
By following these steps and leveraging available resources, you'll be well on your way to developing powerful and timesaving VBA plugins that elevate your Excel experience. So, unleash your creativity, automate those mundane tasks, and extend the capabilities of your favorite spreadsheet tool!
| epakconsultant |
1,885,058 | Hello World | A post by NISHANTH CS | 0 | 2024-06-12T02:37:04 | https://dev.to/nishanth_cs_0c45025324f97/hello-world-28a9 | hello |
 | nishanth_cs_0c45025324f97 |
1,885,057 | CAS No.: 26530-20-1: Safety and Usage Guidelines | CAS No. : 26530-20-1, the Safe plus Innovative Component for Your specs Selecting the component and... | 0 | 2024-06-12T02:34:41 | https://dev.to/johnnie_heltonke_fbec2631/cas-no-26530-20-1-safety-and-usage-guidelines-22di | design |
CAS No. : 26530-20-1, the Safe plus Innovative Component for Your specs
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What Is CAS No. : 26530-20-1
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The use of CAS No. : 26530-20-1 varies based on the company that is continuing well as application. It is vital to stick to the goods's instructions to make sure the chemical is useful plus safer. The chemical is utilized being fully a thickener, and it also should be a right part of smaller amounts for example, in visual items. In meals, CAS No. : 26530-20-1 and CAS NO.:52-51-7 is required like a flavoring agent, which will be imperative to continue using the product's tips about usage. The chemical is required to develop medicine circulation methods, that will be vital that you use medical-grade CAS No. : 26530-20-1 to ensure their efficient and secure inside the markets which are medical.
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At all of us, we recognize that customer plus quality company are essential in relation to CAS No. : 26530-20-1. Our chemical component ended up being produced below strict quality control guidelines to ensure it satisfies the most demands that are effective. Our focus that is expert on techniques that are revolutionary meet the unique specs of every customer. You can expect support that is exceptional the customers, with the production procedure to circulation. We helps you to make certain that all our users' requirements was came across, and we guarantee satisfaction today.
To sum up, CAS No. : 26530-20-1 products is a chemical that is versatile that is utilized in a true number of businesses. It gives value which are numerous like protection, top-quality bronopol effectiveness, plus innovation. Understanding the safeguards plus utilize directions is key to guarantee the chemical test efficient and secure. At our company, we are dedicated to top-quality that was providing alternatives being revolutionary our customers. E mail us to precisely learn more how exactly we may allow you to using your needs nowadays. | johnnie_heltonke_fbec2631 |
1,885,056 | Hierarchical filter on Select tags & Select.Option of Ant Design | Hierarchical filter on Select tags &... | 0 | 2024-06-12T02:34:38 | https://dev.to/trn_thanhhiu_f59ffe159/hierarchical-filter-on-select-tags-selectoption-of-ant-design-2c9i | webdev, react, antd, beginners | {% stackoverflow 78606128 %}
Could someone help me with this, pleaseeee | trn_thanhhiu_f59ffe159 |
1,885,023 | A PAGE TALKS ABOUT (The 2-Minute Guide: Accessibility Evaluation Approach, Methods, and Tools) | MY WORKOUTS: PICTURE THIS The Accessibility Landscape encompasses Design, Development,... | 0 | 2024-06-12T02:33:00 | https://dev.to/rewirebyautomation/a-page-talks-about-the-2-minute-guide-accessibility-evaluation-approach-methods-and-tools-2km | a11y, testing, automation, qa | **_MY WORKOUTS: PICTURE THIS_**
The **Accessibility Landscape** encompasses **Design, Development, Authoring, Evaluation, and Accessibility Standards & Guidelines** to ensure Web Content is accessible through sophisticated services to all users, including those with disabilities.
> Please consider the story mentioned as a pre-requisite in the preceding post, which is an integral part of the Program Preview.
A PAGE TALKS ABOUT column from the **@reWireByAutomation** channel, which has published a short introduction to **'The Glimpse, Accessibility evaluation' and 'WCAG — Framework View'** as the next session. If you haven’t read it yet, please navigate to these stories first. I recommend reading the introductory story and subsequent session as a prerequisite before scanning below. It will help you to benefit from and establish connectivity throughout this journey.
{% embed https://dev.to/rewirebyautomation/a-page-talks-about-the-glimpse-accessibility-evaluation-dp %}
{% embed https://dev.to/rewirebyautomation/a-page-talks-about-wcag-framework-view-53b2 %}
> Refer to the image below for a Program Preview that links to a series of narratives on the Accessibility Landscape.
> This aims to outline the ‘Approach’ to start the journey with Approach, Methods, and Tools.
This approach is defined in the format of a **‘Top-Down Approach’ that starts from ‘Enterprise’ to ‘Strategy’ and concludes with ‘Build’**. The core objective is to bring the ‘Business Objectives’ into the ‘Enterprise’ direction to form objectives that support products and further strategize the objectives to achieve business goals as per enterprise needs. It is driven by the support of building necessary processes, standards, and guidelines to achieve product accessibility.
> Refer to the mind map below titled **‘Picture This: Approach at Enterprise’** which serves as a starting point for the journey towards “Accessibility Evaluation”.
> Refer to the mind map provided below, entitled **‘Picture This: Approach @Methodology’** which is a critical element for understanding the Methodology that integrates with Product Development Methodology.
> Refer to the mind map provided below, entitled **‘Picture This: Methods — Evaluation’** which outlines the scope of methods, targets analysis on the DOM objects, and corresponding entity checks.
> Refer to the mind map provided below, entitled **‘Picture This: Static Analysis at DOM Objects’** which outlines browser extension tools and entity checks.
> Refer to the mind map provided below, entitled **‘Picture This: Static Read & Interaction Analysis at Dom Objects’** which outlines Screen Reader Tools and entity checks.
> Refer to the mind map provided below, entitled ‘**Picture This: Automation In Brief’** which outlines the scope of automation integration in accessibility evaluation.
> The Conclusion: Picture This
> Refer to the voiceover session below from the @rewirebyautomation Automation YouTube channel.
{% embed https://youtu.be/XGf_-59rtGE %}
> As part of the upcoming stories, I will soon publish **Making the Mobile Web & App Accessible** which is designed to offer valuable insights into Accessibility Evaluation.
**_This is @reWireByAutomation, signing off!_**
| rewirebyautomation |
1,885,051 | Research on Binance Futures Multi-currency Hedging Strategy Part 1 | Click the research button on the Dashboard page, and then click the arrow to enter. Open the uploaded... | 0 | 2024-06-12T02:23:41 | https://dev.to/fmzquant/research-on-binance-futures-multi-currency-hedging-strategy-part-1-32a2 | strategy, fmzquant, binance, hedging | Click the research button on the Dashboard page, and then click the arrow to enter. Open the uploaded .pynb suffix file and press shift + enter to run line by line. There are basic tutorials in the usage help of the research environment.
## Strategy reasons
Binance has listed many altcoins on the spot. Although the short-term fluctuations are uncertain, if you look at the daily line for a long time, you will find that they have basically fallen by more than 90%, and some even only have fractions of the highest price fraction. However, there is no universal short selling method for the spot, and there is no special recommendation except for not touching the altcoin. In the past two months, Binance Futures has launched more than 20 perpetual contracts, most of which are mainstream currencies, and some are unknown. This gives us the means to short these altcoin combinations. Using the correlation coefficient between altcoins and BTC will be a effective analysis method, two strategies can be designed.
## Strategy principles
The first strategy: Selling short the selected basket of altcoins in a decentralized equivalent, and at the same time buy long the same amount of position BTC to hedge, in order to reduce risks and volatility. As prices fluctuate, constantly adjust positions to keep short positions values constant and equal to long positions. Essentially it is a operation that selling short the altcoin-bitcoin price index.
The second strategy: shorting currencies with a price higher than the altcoin-bitcoin price index, and longing with currencies lower than the index, the greater the deviation, the greater the position. At the same time, hedging unhedged positions with BTC (or not).
```
# Libraries to import
import pandas as pd
import requests
import matplotlib.pyplot as plt
import seaborn as sns
import numpy as np
%matplotlib inline
```
## Screen the required currency
The Binance perpetual contract currently listed currencies, which can be obtained by using its API interface, are total number of 23 (excluding BTC).
```
#Info = requests.get('https://fapi.binance.com/fapi/v1/exchangeInfo')
#symbols = [symbol_info['baseAsset'] for symbol_info in Info.json()['symbols']]
symbols = ['ETH', 'BCH', 'XRP', 'EOS', 'LTC', 'TRX', 'ETC', 'LINK', 'XLM', 'ADA', 'XMR', 'DASH', 'ZEC', 'XTZ', 'BNB', 'ATOM', 'ONT', 'IOTA', 'BAT', 'VET', 'NEO', 'QTUM', 'IOST']
```
First, let ’s study the price movement of altcoins to Bitcoin in the past year. I have downloaded the data in advance and posted it to the forum, which can be directly cited in the research environment.
```
price_btc = pd.read_csv('https://www.fmz.com/upload/asset/1ef1af8ec28a75a2dcb.csv', index_col = 0)
price_btc.index = pd.to_datetime(price_btc.index,unit='ms') #Index date
```
```
price_btc.tail()
```
Results:
5 rows × 23 columns
First draw the prices of these currencies to see the trend, the data should be normalized. It can be seen that except for four currencies, the price trends of the other currencies are basically the same, showing a downward trend.
```
price_btc_norm = price_btc/price_btc.fillna(method='bfill').iloc[0,]
price_btc_norm.plot(figsize=(16,6),grid = True,legend=False);
```
By sorting the last price changes, you can find several coins that are obviously different, namely LINK, XTZ, BCH, ETH. Explain that they can often running their own trend, and shorting them has a higher risk and needs to be excluded from the strategy.
Draw a heat map of the correlation coefficient of the remaining currencies, and find that the trend of ETC and ATOM is also relatively special and can be excluded.
```
price_btc_norm.iloc[-1,].sort_values()[-5:]
```
Results:
```
ETH 0.600417
ETC 0.661616
BCH 1.141961
XTZ 2.512195
LINK 2.764495
Name: 2020-03-25 00:00:00, dtype: float64
```
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) # Remaining currencies
```
```
plt.subplots(figsize=(12, 12)) # Set the screen size
sns.heatmap(price_btc[trade_symbols].corr(), annot=True, vmax=1, square=True, cmap="Blues");
```
The last remaining currency fell by an average of 66% a year, obviously there is ample room for shorting. Synthesizing the trend of these coins into the altcoin price index, it was found that it basically fell all the way, it was more stable in the second half of last year, and began to fall all the way this year. This study screened out 'LINK', 'XTZ', 'BCH', 'ETH', 'ETC', 'ATOM', 'BNB', 'EOS', 'LTC' did not participate in the short of the first strategy, specific details can be backtest by yourself.
It should be noted that the current altcoin index is at the low point of the past year. Perhaps it is not a short opportunity, rather a buying long opportunity. you have to decide it by yourself.
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH', 'ETC','ATOM','BNB','EOS','LTC'])) # You can set the remaining currencies, which you want to subtract.
1-price_btc_norm[trade_symbols].iloc[-1,].mean()
```
Results:
```
0.6714306758250285
```
```
price_btc_norm[trade_symbols].mean(axis=1).plot(figsize=(16,6),grid = True,legend=False);
```
## Binance Sustainability Data
Similarly, the data on Binance Sustainability has been collated, you can also directly quote it in your notebook, the data is the 1h market K line from January 28 to March 31, 2020, because most of Binance perpetual contract have been lunched only two months, so the data is sufficient for backtest.
```
price_usdt = pd.read_csv('https://www.fmz.com/upload/asset/20227de6c1d10cb9dd1.csv ', index_col = 0)
price_usdt.index = pd.to_datetime(price_usdt.index)
```
```
price_usdt.tail()
```
Results:
First look at the overall trend with normalized data. In the March plunge, relative to the price in early February, the price was generally cut, showing that the risk of perpetual contract is also very high. This wave of decline is also a big challenge test for the strategy.
```
price_usdt_norm = price_usdt/price_usdt.fillna(method='bfill').iloc[0,]
price_usdt_norm.plot(figsize=(16,6),grid = True,legend=False);
```
Draw the index price of the coin we want to sell against Bitcoin, the strategy principle is to short this curve, and the return is basically the reverse of this curve.
```
price_usdt_btc = price_usdt.divide(price_usdt['BTC'],axis=0)
price_usdt_btc_norm = price_usdt_btc/price_usdt_btc.fillna(method='bfill').iloc[0,]
price_usdt_btc_norm[trade_symbols].mean(axis=1).plot(figsize=(16,6),grid = True);
#price_usdt_btc_norm.mean(axis=1).plot(figsize=(16,6),grid = True,legend=False);
```
## Backtest engine
Because the FMZ local backtest does not have data for all currencies and does not support multi-currency backtest, it is necessary to reimplement a backtest engine. So i wrote a new backtest engine, it is relatively simple, but basically enough. Taking into account the transaction fee, but basically ignored the capital rate, did not consider the situation of maintaining the margin capital. The total equity, occupied margin, and leverage were recorded. Since this strategy has the attribute that long position equals short position, so the impact of capital rates is not significant.
The backtest does not take into account the price slippage situation, you can increase the transaction fee simulation by yourself, considering the low transaction fee of Binance maker, even the price gap difference in the unpopular currency market is very small, you can use the iceberg commission method in the real market when placing an order, the impact should not be significant.
When creating an exchange object, you need to specify the currency to be traded. Buy is long and Sell is short. Due to the perpetual contract limitation, when opening position, the long and short positions are automatically closed together. When selling short position and the number of currencies are negative. The parameters are as follows:
- trade_symbols: list of currencies to be traded
- leverage: leverage, affect margin,
- commission: transaction fee, default 0.00005
- initial_balance: initial asset, USDT valuation
- log: whether to print transaction records
```
class Exchange:
def __init__(self, trade_symbols, leverage=20, commission=0.00005, initial_balance=10000, log=False):
self.initial_balance = initial_balance # Initial asset
self.commission = commission
self.leverage = leverage
self.trade_symbols = trade_symbols
self.date = ''
self.log = log
self.df = pd.DataFrame(columns=['margin','total','leverage','realised_profit','unrealised_profit'])
self.account = {'USDT':{'realised_profit':0, 'margin':0, 'unrealised_profit':0, 'total':initial_balance, 'leverage':0}}
for symbol in trade_symbols:
self.account[symbol] = {'amount':0, 'hold_price':0, 'value':0, 'price':0, 'realised_profit':0, 'margin':0, 'unrealised_profit':0}
def Trade(self, symbol, direction, price, amount, msg=''):
if self.date and self.log:
print('%-20s%-5s%-5s%-10.8s%-8.6s %s'%(str(self.date), symbol, 'buy' if direction == 1 else 'sell', price, amount, msg))
cover_amount = 0 if direction*self.account[symbol]['amount'] >=0 else min(abs(self.account[symbol]['amount']), amount)
open_amount = amount - cover_amount
self.account['USDT']['realised_profit'] -= price*amount*self.commission # Minus transaction fee
if cover_amount > 0: # close position first
self.account['USDT']['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount # profit
self.account['USDT']['margin'] -= cover_amount*self.account[symbol]['hold_price']/self.leverage # Free the margin
self.account[symbol]['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount
self.account[symbol]['amount'] -= -direction*cover_amount
self.account[symbol]['margin'] -= cover_amount*self.account[symbol]['hold_price']/self.leverage
self.account[symbol]['hold_price'] = 0 if self.account[symbol]['amount'] == 0 else self.account[symbol]['hold_price']
if open_amount > 0:
total_cost = self.account[symbol]['hold_price']*direction*self.account[symbol]['amount'] + price*open_amount
total_amount = direction*self.account[symbol]['amount']+open_amount
self.account['USDT']['margin'] += open_amount*price/self.leverage
self.account[symbol]['hold_price'] = total_cost/total_amount
self.account[symbol]['amount'] += direction*open_amount
self.account[symbol]['margin'] += open_amount*price/self.leverage
self.account[symbol]['unrealised_profit'] = (price - self.account[symbol]['hold_price'])*self.account[symbol]['amount']
self.account[symbol]['price'] = price
self.account[symbol]['value'] = abs(self.account[symbol]['amount'])*price
return True
def Buy(self, symbol, price, amount, msg=''):
self.Trade(symbol, 1, price, amount, msg)
def Sell(self, symbol, price, amount, msg=''):
self.Trade(symbol, -1, price, amount, msg)
def Update(self, date, close_price): # Update assets
self.date = date
self.close = close_price
self.account['USDT']['unrealised_profit'] = 0
for symbol in self.trade_symbols:
if np.isnan(close_price[symbol]):
continue
self.account[symbol]['unrealised_profit'] = (close_price[symbol] - self.account[symbol]['hold_price'])*self.account[symbol]['amount']
self.account[symbol]['price'] = close_price[symbol]
self.account[symbol]['value'] = abs(self.account[symbol]['amount'])*close_price[symbol]
self.account['USDT']['unrealised_profit'] += self.account[symbol]['unrealised_profit']
if self.date.hour in [0,8,16]:
pass
self.account['USDT']['realised_profit'] += -self.account[symbol]['amount']*close_price[symbol]*0.01/100
self.account['USDT']['total'] = round(self.account['USDT']['realised_profit'] + self.initial_balance + self.account['USDT']['unrealised_profit'],6)
self.account['USDT']['leverage'] = round(self.account['USDT']['margin']/self.account['USDT']['total'],4)*self.leverage
self.df.loc[self.date] = [self.account['USDT']['margin'],self.account['USDT']['total'],self.account['USDT']['leverage'],self.account['USDT']['realised_profit'],self.account['USDT']['unrealised_profit']]
```
```
# First test the backtest engine
e = Exchange(['BTC','XRP'],initial_balance=10000,commission=0,log=True)
e.Buy('BTC',100, 5)
e.Sell('XRP',10, 50)
e.Sell('BTC',105,e.account['BTC']['amount'])
e.Buy('XRP',9,-e.account['XRP']['amount'])
round(e.account['USDT']['realised_profit'],4)
```
```
75.0
```
## The first strategy code
Strategy logic:
- Check the currency price, if not "nan", you can trade
- Check the value of the altcoin contract. If it is less than the target - value trade_value, the corresponding difference will be short sold, and if it is greater, the corresponding amount will be bought to close the position.
- Add the short value of all altcoins and adjust the BTC position to hedge against it.
The short trade_value position determines the size of the position. Setting log = True will print the transaction log
```
# Need to hedge with BTC
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH', 'ETC','ATOM','BNB','EOS','LTC'])) # Remaining currencies
e = Exchange(trade_symbols+['BTC'],initial_balance=10000,commission=0.0005,log=False)
trade_value = 2000
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
if e.account[symbol]['value'] - trade_value < -20 :
e.Sell(symbol, price, round((trade_value-e.account[symbol]['value'])/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if e.account[symbol]['value'] - trade_value > 20 :
e.Buy(symbol, price, round((e.account[symbol]['value']-trade_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
empty_value += e.account[symbol]['value']
price = row[1]['BTC']
if e.account['BTC']['value'] - empty_value < -20:
e.Buy('BTC', price, round((empty_value-e.account['BTC']['value'])/price,6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
if e.account['BTC']['value'] - empty_value > 20:
e.Sell('BTC', price, round((e.account['BTC']['value']-empty_value)/price,6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
stragey_1 = e
```
The final profit of each currency is as follows:
```
pd.DataFrame(stragey_1.account).T.apply(lambda x:round(x,3))
```
The two graphs below are the net worth curve and the leverage used.
The yellow in the net worth curve is the effect of 1x leverage shorting the altcoin index. It can be seen that the strategy basically amplifies the fluctuation of the index, which is in line with expectations. The final two-month return is 60%, the maximum retracement is 20%, and the maximum leverage is about 8 times. Most of the time, it is less than 6 times. It is still safe. Most importantly, complete hedging has made the strategy lose little in the March 12th plunge.
When the short-selling currency price rises and the contract value increases, the position is reduced, on the other hand, when gaining profit, the position is increased. This keeps the total value of the contract constant, even if the skyrocketing falls have limited losses.
But the risks were also mentioned earlier, altcoins are very likely to run their own trend, and may rise a lot from the bottom. It depends on how to use it. If you are optimistic about the altcoin and think that it has reached the bottom, you can operate in the direction and buying long this index. Or if you are optimistic about certain currencies, you can hedge with them.
```
(stragey_1.df['total']/stragey_1.initial_balance).plot(figsize=(18,6),grid = True); # Net worth curve
#(2-price_usdt_btc_norm[trade_symbols].mean(axis=1)).plot(figsize=(18,6),grid = True);
```
```
# Strategy leverage
stragey_1.df['leverage'].plot(figsize=(18,6),grid = True);
```
In addition, since the price of the altcoin against the USDT also fell, the extreme plan is not hedged, directly selling short, but the fluctuation is very large and the retracement is high
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH', 'ETC','ATOM','BNB','EOS','LTC'])) # Remaining currencies
e = Exchange(trade_symbols+['BTC'],initial_balance=10000,commission=0.0005,log=False)
trade_value = 2000
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
if e.account[symbol]['value'] - trade_value < -20 :
e.Sell(symbol, price, round((trade_value-e.account[symbol]['value'])/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if e.account[symbol]['value'] - trade_value > 20 :
pass
#e.Buy(symbol, price, round((e.account[symbol]['value']-trade_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
empty_value += e.account[symbol]['value']
stragey_1b = e
```
```
(stragey_1b.df['total']/stragey_1.initial_balance).plot(figsize=(18,6),grid = True); # Net worth curve
(2-price_usdt_btc_norm[trade_symbols].mean(axis=1)).plot(figsize=(18,6),grid = True);
```
## The second strategy code
Strategy logic:
- Check if there is a price or there is a price to trade
- Check the deviation of the currency price from the index
- Go long and short based on the deviation judgment, and judge the position according to the deviation size
- Calculate unhedged positions and hedge with BTC
Trade_value also controls the size of open positions. You can also modify the conversion factor of diff/0.001
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) # Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols+['BTC'],initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,0)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 50:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -50:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
price = row[1]['BTC']
aim_value = -empty_value
now_value = e.account['BTC']['value']*np.sign(e.account['BTC']['amount'])
if aim_value - now_value > 50:
e.Buy('BTC', price, round((aim_value - now_value)/price, 6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
if aim_value - now_value < -50:
e.Sell('BTC', price, -round((aim_value - now_value)/price, 6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
stragey_2 = e
```
The return of the second strategy is much better than the first strategy. In the past two months, it has 100% return, but still has a 20% retracement. In the past week, due to the small market fluctuations, the return is not obvious. The overall leverage is not much. This strategy is worth trying. Depending on the degree of deviation, more than 7800 USDT position was opened at most.
Note that if a currency runs out a independent trend, for example, it has increased several times relative to the index, it will accumulate a large number of short positions in the currency, and the same sharp decline will also make the strategy to buy long, which can limit the maximum opening position.
```
(stragey_2.df['total']/stragey_2.initial_balance).plot(figsize=(18,6),grid = True);
```
```
# Summary results by currency
pd.DataFrame(e.account).T.apply(lambda x:round(x,3))
```
```
e.df['leverage'].plot(figsize=(18,6),grid = True);
```
If the result of not hedging is as follows, the difference is actually not much. Because long and short positions are basically balanced.
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) # Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2b = e
```
```
(stragey_2b.df['total']/stragey_2.initial_balance).plot(figsize=(18,6),grid = True);
#(stragey_2.df['total']/stragey_2.initial_balance).plot(figsize=(18,6),grid = True); # Can be stacked together
```
If you refer to the USDT price regression, the effect will be much worse
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH']))+['BTC'] #Remaining currencies
price_usdt_norm_mean = price_usdt_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols,initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols+['BTC']:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_norm.loc[row[0],symbol] - price_usdt_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
stragey_2c = e
```
```
(stragey_2c.df['total']/stragey_2.initial_balance).plot(figsize=(18,6),grid = True);
(stragey_2b.df['total']/stragey_2.initial_balance).plot(figsize=(18,6),grid = True);
```
If you limit the maximum position value, the performance will be worse
```
trade_symbols = list(set(symbols)-set(['LINK','XTZ','BCH', 'ETH'])) #Remaining currencies
price_usdt_btc_norm_mean = price_usdt_btc_norm[trade_symbols].mean(axis=1)
e = Exchange(trade_symbols+['BTC'],initial_balance=10000,commission=0.0005,log=False)
trade_value = 300
for row in price_usdt.iloc[:].iterrows():
e.Update(row[0], row[1])
empty_value = 0
for symbol in trade_symbols:
price = row[1][symbol]
if np.isnan(price):
continue
diff = price_usdt_btc_norm.loc[row[0],symbol] - price_usdt_btc_norm_mean[row[0]]
aim_value = -trade_value*round(diff/0.01,1)
now_value = e.account[symbol]['value']*np.sign(e.account[symbol]['amount'])
empty_value += now_value
if aim_value - now_value > 20 and abs(aim_value)<3000:
e.Buy(symbol, price, round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
if aim_value - now_value < -20 and abs(aim_value)<3000:
e.Sell(symbol, price, -round((aim_value - now_value)/price, 6),round(e.account[symbol]['realised_profit']+e.account[symbol]['unrealised_profit'],2))
price = row[1]['BTC']
aim_value = -empty_value
now_value = e.account['BTC']['value']*np.sign(e.account['BTC']['amount'])
if aim_value - now_value > 20:
e.Buy('BTC', price, round((aim_value - now_value)/price, 6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
if aim_value - now_value < -20:
e.Sell('BTC', price, -round((aim_value - now_value)/price, 6),round(e.account['BTC']['realised_profit']+e.account['BTC']['unrealised_profit'],2))
stragey_2d = e
```
```
(stragey_2d.df['total']/stragey_2.initial_balance).plot(figsize=(17,6),grid = True);
```
## Summary and Risk
The first strategy takes advantage of the fact that the overall value of altcoins is not as good as bitcoin. If you buying long bitcoins, you may wish to stick to this strategy for a long time. Due to the long and short positions equivalence, you are basically not afraid of the funding rate of 8h. In the long run, the winning rate is relatively high. But I also worry that the altcoin is currently at the bottom, and it may runs out of a rising trend and cause a loss of this strategy.
The second strategy uses the altcoin's price regression feature, which rises more than the index and has a high probability of falling back. However, it may accumulate too many positions in a single currency. If a certain currency really does not fall back, it will cause a large loss.
Due to the different start-up time of the strategy and the specific parameters, the impact of people who use this strategy for a long time should not be great.
In short, there is no perfect strategy, only a correct attitude to the strategy, it ultimately depends on the user's understanding of risks and judgment of the future.
From: https://blog.mathquant.com/2020/05/09/research-on-binance-futures-multi-currency-hedging-strategy-part-1.html | fmzquant |
1,885,022 | About Twinkly USA | Revolutionizing Christmas Lights Twinkly is a brand created by Italian tech company Ledworks, a... | 0 | 2024-06-12T02:14:16 | https://dev.to/twinklyusa/about-twinkly-usa-hkn | Revolutionizing [Christmas Lights](https://twinkly.com/en-us/collections/christmas-lighting)
Twinkly is a brand created by Italian tech company Ledworks, a market leader in [smart lights](https://twinkly.com/en-us). Just years after its 2016 launch, Twinkly has already become a global brand, revolutionizing the world of decorative lighting with a range of technologically advanced, patented, and award-winning products.
[Gaming Lights
](https://twinkly.com/en-us/collections/twinkly-for-gamers)
Twinkly isn't just about lighting; it's about elevating the gaming experience to a whole new realm. Twinkly provides immersive gaming experience. And they're just warming up—Twinkly is on a mission to craft innovative gaming lights for the community.
[Christmas Lights](https://twinkly.com/en-us/collections/christmas-lights)
Step into the future of Christmas lighting decoration with Twinkly smart LED lights, controllable from your app all year round. The Twinkly App makes setting up a breeze, allowing you to map out your Christmas lights with your smartphone, sync up multiple sets for grand Christmas displays, and even sync with Twinkly Music for a light show that dances to the beat of your favorite tunes.
[Outdoor Lights](https://twinkly.com/en-us/collections/outdoor-garden-lights)
Elevate your outdoor and garden spaces with a range of lighting solutions for gardens and outdoors. Whether you're hosting a cozy backyard gathering or a grand outdoor event, our lights are designed to create the perfect mood.
[Home Decorative Lights
](https://twinkly.com/en-us/collections/home-decor)In the fast-evolving world of smart homes, Twinkly is leading the charge. Our products don't just light up spaces; they integrate smoothly with the most popular voice assistants and smart home ecosystems, making your home not just smarter, but more magical."
| twinklyusa | |
1,885,021 | Dynamic CSS Shadows Creation | In this lab, we will explore how to create dynamic shadows using CSS. You will learn how to use the ::after pseudo-element and various CSS properties such as background, filter, opacity, and z-index to create an effect that mimics a box-shadow, but is based on the colors of the element itself. By the end of this lab, you will be able to add an extra layer of depth and dimensionality to your designs. | 27,689 | 2024-06-12T02:09:19 | https://labex.io/tutorials/css-dynamic-css-shadows-creation-35194 | css, coding, programming, tutorial |
# ① Dynamic Shadow
`index.html` and `style.css` have already been provided in the VM.
To create a shadow that is based on the colors of an element, follow these steps:
1. Use the `::after` pseudo-element with `position: absolute` and `width` and `height` set to `100%` to fill the available space in the parent element.
2. Inherit the `background` of the parent element by using `background: inherit`.
3. Slightly offset the pseudo-element using `top`. Then, use `filter: blur()` to create a shadow, and set `opacity` to make it semi-transparent.
4. Position the pseudo-element behind its parent by setting `z-index: -1`. Set `z-index: 1` on the parent element.
Here's an example HTML and CSS code:
```html
<div class="dynamic-shadow"></div>
```
```css
.dynamic-shadow {
position: relative;
width: 10rem;
height: 10rem;
background: linear-gradient(75deg, #6d78ff, #00ffb8);
z-index: 1;
}
.dynamic-shadow::after {
content: "";
width: 100%;
height: 100%;
position: absolute;
background: inherit;
top: 0.5rem;
filter: blur(0.4rem);
opacity: 0.7;
z-index: -1;
}
```
Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the **Web 8080** Tab to preview the web page.
# ② Summary
Congratulations! You have completed the Dynamic Shadow lab. You can practice more labs in LabEx to improve your skills.
---
## Want to learn more?
- 🚀 Practice [Dynamic CSS Shadows Creation](https://labex.io/tutorials/css-dynamic-css-shadows-creation-35194)
- 🌳 Learn the latest [CSS Skill Trees](https://labex.io/skilltrees/css)
- 📖 Read More [CSS Tutorials](https://labex.io/tutorials/category/css)
Join our [Discord](https://discord.gg/J6k3u69nU6) or tweet us [@WeAreLabEx](https://twitter.com/WeAreLabEx) ! 😄 | labby |
1,885,002 | Access Google Cloud Storage from AWS Lambda using Workload Identity Federation | In this post we will look at how to access Google cloud storage from AWS Lambda functions using... | 0 | 2024-06-12T01:54:48 | https://dev.to/specky_shooter/access-google-cloud-storage-from-aws-lambda-using-workload-identity-federation-3laj | In this post we will look at how to access Google cloud storage from AWS Lambda functions using Google's Workforce Identity Federation.
Typically, when you access the resources belonging to one cloud from another cloud or from any other environment, you would use a service account credentials file, but this has a couple of downsides to it, one of them being the fact that anyone can use the service account credentials file to access the resources and the other being the fact that the credentials file have long expiry times.
Using the Workforce Identity Federation the caller or the consuming entity which is AWS Lambda in this case can access the destination resource without using a credentials file. This is achieved by creating a **Workforce Identity Pool** on Google Cloud IAM and providing the necessary permissions for the members of the identity pool to access the Google Cloud Storage bucket and downloading a configuration file, which will help the Google Cloud Storage client library to authenticate and access the required cloud storage bucket.
There is also a helpful [YouTube video](https://www.youtube.com/watch?v=Eh0mJwFo9Ak&t=1766s) on the topic, however bear in mind that this video is quite old and this uses service account impersonation as a means to access the destination resource and also at the time of the recording of this video, workforce identity could only be configured using command-line, but lately Google has provided another option which does not require any service account impersonation for the authentication to work and also the entire configuration could be done using Google cloud console UI, the details of which we will see in this post. However, this YouTube video will definitely help you get a basic understanding of this topic.
## Create Workload Identity Pool
- Visit `Console > IAM > Workload Identity Federation`
- Click on `Create Pool` and enter name and description
- Enter the provider details, which is your AWS account information in this case
- Finally, you can leave the defaults as it is for the attribute mapping
- Click `Save`
Once the identity pool has been created, the next step is to provide necessary permissions for the members of the identity pool to access the Google cloud storage bucket.
- Visit `GCS > Bucket > Permissions tab`
- Click `Grant Access`
- For the principal name use the following:
```
principalSet://iam.googleapis.com/projects/<GCS_PROJECT_NUMBER>/locations/global/workloadIdentityPools/<WORKLOAD_IDENTITY_POOL_ID>/attribute.aws_role/arn:aws:sts::<AWS_ACCOUNT_NUMBER>:assumed-role/<LAMBDA_FUNCTION_EXECUTION_ROLE>
```
Let me explain the variables that are used in the above block.
| Variable | Description |
| -------- | ----------- |
| GCS_PROJECT_NUMBER | Note that this is not Google Cloud Project ID, instead it is the Google Cloud Project number. |
| WORKLOAD_IDENTITY_POOL_ID | this is the name of the identity pole that we created earlier, this example it will be `aws-pool-1` |
| AWS_ACCOUNT_NUMBER | Your AWS account number |
| LAMBDA_FUNCTION_EXECUTION_ROLE | this is the land of function execution role that you were assigned for your lambda function which you would create and assign in AWS console IAM. |
# AWS Setup
- Download the workload identity pool configuration file.
- Note: you don't have to create any service account for this set up to work.
- Add this file to any location on your AWS lambda code.
- Bundle this file with the other files that are created for deployment on AWS Lambda.
- It is also safe to commit this file to your repository, because this file does not have actual credentials, instead it only has some configuration which will be used by the client libraries to validate against the workload identity pool.
- Create an environment variable, `GOOGLE_APPLICATION_CREDENTIALS` pointing to the location of the file in your lambda bundle, so that the client libraries can use this environment variable to locate the configuration file.
In summary, this method does not require you to create any long living service account files which is always a security risk, instead you could simply create a workload identity pool and provide the necessary permissions for the members of the pool to access any of your Google Cloud resources and include the config file as part of your deployment bundle and the client libraries will use this file to authenticate the execution environment to access the Google cloud resources that the identity member has got access to.
**References**
https://cloud.google.com/iam/docs/workload-identity-federation#mapping
https://cloud.google.com/docs/authentication/application-default-credentials#GAC | specky_shooter | |
1,885,014 | How to Make Money with IPTV: A Step-by-Step Guide | Are you interested in making money by selling IPTV services? With the right tools and knowledge, you... | 0 | 2024-06-12T01:48:31 | https://dev.to/4k_ott_iptv_supplier/how-to-make-money-with-iptv-a-step-by-step-guide-3eg6 | iptv, makemoney, iptvreseller, tutorial | Are you interested in making money by selling IPTV services? With the right tools and knowledge, you can start your own IPTV reseller business and earn a steady income. In this tutorial, we will guide you through the process of setting up your business and provide you with the necessary information to get started.
The first step in setting up your IPTV reseller business is to choose the right panel. There are several options available, each with its own set of features and pricing. Here are a few examples:
LION Panel: This panel offers 15,000+ HD/FHD/4K live channels, 60,000+ HD/FHD/4K VODs, and channel logos. It also includes a TV guide (EPG) and the ability to create sub-resellers. The prices for this panel are 1 day test = free, 1 month = 0.1 credit, 3 months = 0.3 credits, and 6 months = 0.5 credits. Credit packages are available for 1, 5, 10, 20, 50, and 100 credits.
MEGAOTT Panel: This panel offers 25,000+ live channels, 70,000+ movies and TV shows, and channel logos. It also includes a TV guide (EPG) and the ability to create sub-resellers. The prices for this panel are 2 hour test = free, 1 month = 0.1 credit, 3 months = 0.25 credits, and 6 months = 0.5 credits. Credit packages are available for 1, 5, 10, 20, 50, and 100 credits.
DIAMOND Panel: This panel offers 16,000+ HD/FHD/4K live channels, 65,000+ HD/FHD/4K VODs, and channel logos. It also includes a TV guide (EPG) and the ability to create sub-resellers. The prices for this panel are 1 day test = free, 1 month = 0.1 credit, 3 months = 0.3 credits, and 6 months = 0.5 credits. Credit packages are available for 10, 20, 50, and 100 credits.
Once you have set up your business, you need to manage your customers. This includes providing them with the IPTV services they have purchased and handling any issues they may have. Here are some steps to follow:
Provide IPTV Services: Provide your customers with the IPTV services they have purchased. This includes setting up their accounts and providing them with the necessary information to access their services.
Handle Customer Issues: Handle any issues your customers may have. This includes resolving any technical issues they may have and providing them with support.
Join Our Community
To stay updated on the latest developments and to connect with other resellers, join our community:
Telegram Channel: https://t.me/globaliptvpanel
Discord Server: https://discord.gg/NGpEMqqb
WhatsApp: http://wa.link/n5ly4j
WhatsApp: +44 7520 636771
Telegram Contact: @ottsupplier5
Discord Contact: OttSupplier#3188 | 4k_ott_iptv_supplier |
1,885,013 | Why I Developed a Salesforce Chrome Extension? | In the daily work of Salesforce administrators and developers, efficiency is key. One major challenge... | 0 | 2024-06-12T01:46:25 | https://dev.to/dyn/why-i-developed-a-salesforce-chrome-extension-361a | productivity, typescript, salesforce, chrome |
In the daily work of Salesforce administrators and developers, efficiency is key. One major challenge is quickly locating and accessing Salesforce configurations and metadata. To address this issue, I developed the Salesforce Spotlight Chrome Extension. Here are the reasons behind this development and the benefits it brings.
## Background
As a Salesforce engineer, I noticed that frequently navigating through the Salesforce interface to find configurations was very time-consuming. Whether searching for users, objects, fields, Apex Classes, Apex Triggers, Flows, or Reports, a lot of time was wasted switching between different screens, which significantly reduced work efficiency. I tried several Salesforce-related extensions but found that most tools in the market did not provide a quick and intuitive search function to directly locate configurations and metadata. This lack of effective tools prompted me to start this project.
## Challenges
- **Time Consumption**: Finding specific configurations in the Salesforce environment often requires multiple page clicks or links, wasting a lot of time.
- **Poor User Experience**: Frequent screen switching and manual searching not only result in poor user experience but also significantly impact work efficiency.
- **Repetitive Tasks**: Repetitive operations increase time costs and significantly reduce overall productivity.
## Solution
To solve these issues, I decided to develop a Chrome Extension named Salesforce Spotlight. The main function of this extension is to open a search box with a keyboard shortcut, allowing users to quickly find Salesforce configurations and metadata. Specific features include:
- **Quick Search**: Quickly locate the needed configuration or metadata by entering keywords.
- **Keyboard Shortcuts**: Trigger the search box with keyboard shortcuts, reducing mouse operations and increasing efficiency.
- **Support for Multiple Data Types**: Search for users, objects, fields, Apex Classes, Apex Triggers, Flows, and Reports.
- **Support for Setup Home Configurations**: Locate all Setup Home configurations on the Lightning platform.
- **Command Line Integration**: The extension supports searching Salesforce CLI commands, helping developers quickly find the necessary commands and their usage (under development).
## Implementation Process
During the development of Salesforce Spotlight, I focused on the following aspects:
- **Performance Optimization**: Ensuring the extension is responsive during loading and searching to provide a smooth user experience.
- **API Integration**: Utilizing Salesforce APIs to fetch the latest configuration and metadata, ensuring data timeliness and accuracy.
- **User Interface**: Designing a simple and intuitive interface that users can easily adopt and efficiently use.
## Conclusion
By developing the Salesforce Spotlight Chrome Extension, I aim to help Salesforce administrators and developers improve their work efficiency and reduce the time spent on tedious tasks. This extension also demonstrates how tool optimization can improve user experience and boost overall productivity. If you are a Salesforce administrator or developer, I invite you to try Salesforce Spotlight and provide feedback. Let's work together to enhance our work efficiency and enjoy a more productive workflow!
## Download and Experience
Currently, the extension is still in the testing phase and has not been released on the Chrome Web Store. If you want to experience it, please click [Salesforce Spotlight](https://chromewebstore.google.com/detail/salesforce-spotlight/kcnnhfdenihbihoikgjfapgphapdoggd) to download the latest version.
| dyn |
1,885,011 | flower with heart | Check out this Pen I made! | 0 | 2024-06-12T01:34:45 | https://dev.to/uzumaki156/flower-with-heart-2c0 | codepen | Check out this Pen I made!
{% codepen https://codepen.io/ahmed-abdo-the-bashful/pen/dyEVqEB %} | uzumaki156 |
1,885,010 | SQL IDEs/Editors for making MySQL usage Easier and more Efficient | As a developer, especially for those who work with MySQL databases, using the right SQL tools is... | 0 | 2024-06-12T01:33:09 | https://dev.to/concerate/sql-ideseditors-for-making-mysql-usage-easier-and-more-efficient-1fgd | As a developer, especially for those who work with MySQL databases, using the right SQL tools is crucial as it can simplify daily tasks.
Here are the top 3 recommended user-friendly SQL IDEs or SQL Editors:
**1. SQLynx**
SQLynx supports both web-based and client-side operations. It can handle various types of databases including MySQL, PostgreSQL, Oracle.The product has a simple interface and offers excellent stability.
The web-based version supports enterprise user authentication, security features, and collaborative management needs.
_Pricing: Free for non-commercial use._
Download Link:http://www.sqlynx.com/en/#/home/probation/SQLynx
**2、DataGrip**
DataGrip is a powerful database IDE that offers advanced features for SQL development and database management. It supports various databases such as MySQL, PostgreSQL, Oracle, SQL Server, and more.
DataGrip provides an intuitive user interface, code completion, database navigation, and other productivity-enhancing tools.
_Pricing: Paid._
Download Link: https://www.jetbrains.com/datagrip/
**3. DBeaver**
DBeaver is an open-source database management tool that supports a wide range of databases, including SQL, NoSQL, and cloud databases. It's known for its extensibility and cross-platform capabilities. Due to its open-source nature, DBeaver offers a wide range of functionalities, but its stability is considered average.
_Pricing: Community edition is free, while the enterprise edition is paid._
Download Link: https://dbeaver.io/
Summary:
For users with high stability requirements, it is recommended to prioritize SQLynx and DataGrip.
For users looking for open-source options, it is suggested to prioritize DBeaver.
| concerate | |
1,885,009 | CAS No.: 52-51-7: Potential Applications and Benefits | CAS No.: 52-51-7: Potential Applications and Benefits Are you looking for a compound chemical has... | 0 | 2024-06-12T01:29:43 | https://dev.to/walter_davisker_b9f5919a3/cas-no-52-51-7-potential-applications-and-benefits-265n | CAS No.: 52-51-7: Potential Applications and Benefits
Are you looking for a compound chemical has many prospective uses? One compound such known as CAS No.: 52-51-7. We'll explore the various advantages, innovations, safety measures, and applications with this chemical versatile.
Advantages and Innovations
CAS No.: 52-51-7, also known as L(+)-Ascorbic Acid or Vitamin C, has advantages being several innovations. It is a vitamin water-soluble has antioxidant properties, which help protect cells from damage caused by free radicals. It is also essential for the production of collagen, a protein that helps in the repair and growth of tissues in the body.
Another advantage of CAS No.: 52-51-7 is that it helps improve the system resistant stimulating the production of white blood cells. This, in turn, helps the physical body fight off infections and diseases. It also helps improve the absorption of iron from plant-based foods and helps prevent iron deficiency anemia.
Safety Measures
CAS No.: 52-51-7 is generally considered safe when taken in the recommended doses. In line with the National Institutes of Health (NIH), the recommended intake daily adults is 75-90 milligrams per day. However, in high doses, it can cause diarrhea, nausea, and cramps that are abdominal.
Its additionally important to note that taking too much CAS NO.:52-51-7 can lead to kidney stones and interfere with the absorption of minerals such as selenium and copper. Therefore, it is recommended to take the health supplement in recommended doses and under the guidance of a healthcare professional.
Use
CAS No.: 52-51-7 can be used in a variety of ways. It is commonly found in dietary supplements and foods that are fortified such as morning meal cereals, fruit drinks, and energy bars. It is also used in cosmetics and skincare products due to its properties that are antioxidant which help fight the signs of aging.
CAS No.: 52-51-7 is also used in the food industry as a preservative, as it helps prevent the oxidation of food and the growth of bacteria. Its acidic properties make it an ingredient essential the production of jams, jellies, and other confectionery items. Additionally, it is used in the industry pharmaceutical a functional excipient in the formulation of various drugs.
How to Use
It is important to talk to a healthcare professional to determine the appropriate dosage if you are considering taking CAS No.: 52-51-7 as a supplement. It can be taken in various forms, such as capsules, pills, or powder. It is also obtainable in topical creams and serums for skincare.
When used in food or cooking processing, cas no 52 51 7 can be added to the recipe as required, but it is very important to keep in mind the recommended intake to avoid overconsumption.
Service and Quality
When purchasing CAS No.: 52-51-7 supplements or products, it is essential to ensure that the product is of good quality and has been manufactured by a company reputable. It is important to choose a product that has been tested for potency and purity to ensure its safety and efficacy. Customer service should be a factor also to consider, as good customer service can help with any questions or concerns you may have regarding the products.
Application
The potential applications of CAS No.: 52-51-7 are vast, ranging from supplements to food and pharmaceuticals. Its antioxidant properties, essential role in the production of collagen, and immune-boosting abilities make it a desirable ingredient in the health and wellness industry. Its use as a preservative in the food industry and excipient in the industry pharmaceutical its flexibility and importance.
Source: https://www.puyuanpharm.com/application/CAS-NO.52-51-7 | walter_davisker_b9f5919a3 | |
1,885,008 | Behind the Code: Variables And Functions | Hoisting is a fundamental concept in JavaScript that often confounds newcomers and even seasoned... | 0 | 2024-06-12T01:28:40 | https://dev.to/whevaltech/behind-the-code-variables-and-functions-41ih | webdev, javascript, programming, tutorial | Hoisting is a fundamental concept in JavaScript that often confounds newcomers and even seasoned developers. This article aims to demystify hoisting by explaining what it is, how it works, and how it affects the way you write and debug JavaScript code.
## What is Hoisting?
Hoisting is JavaScript's default behavior of moving declarations to the top of their containing scope during the compile phase. This means that variable and function declarations are processed before any code is executed, regardless of where these declarations appear in the source code.
## How Hoisting Works
### Variable Hoisting
In JavaScript, both `var` and function declarations are hoisted. However, the way they are hoisted differs.
#### Hoisting with `var`
Variables declared with `var` are hoisted to the top of their function or global scope, but their initialization remains in place. This means that the variable is undefined until the execution reaches the line where the variable is initialized.
```javascript
console.log(hoistedVar); // Output: undefined
var hoistedVar = "I am hoisted!";
console.log(hoistedVar); // Output: I am hoisted!
```
In this example, the declaration `var hoistedVar;` is hoisted to the top, but the assignment `hoistedVar = "I am hoisted!";` stays in its original place.
#### Hoisting with `let` and `const`
Variables declared with `let` and `const` are also hoisted, but unlike `var`, they are not initialized with `undefined`. Instead, they remain in a "temporal dead zone" (TDZ) from the start of the block until the declaration is encountered. Accessing these variables before the declaration results in a `ReferenceError`.
```javascript
console.log(hoistedLet); // ReferenceError: Cannot access 'hoistedLet' before initialization
let hoistedLet = "I am not hoisted!";
```
### Function Hoisting
Function declarations are fully hoisted, meaning both the declaration and the definition are moved to the top of the scope.
```javascript
hoistedFunction(); // Output: I am hoisted!
function hoistedFunction() {
console.log("I am hoisted!");
}
```
In this case, the entire function declaration is hoisted, so you can call the function before it appears in the code.
#### Function Expressions and Arrow Functions
Function expressions and arrow functions are not hoisted. These functions behave like variables declared with `let` or `const`.
```javascript
hoistedFunctionExpression(); // TypeError: hoistedFunctionExpression is not a function
var hoistedFunctionExpression = function() {
console.log("I am not hoisted!");
};
```
Here, `hoistedFunctionExpression` is hoisted as a variable, but it is undefined until the assignment is executed.
## Practical Implications of Hoisting
### Avoiding Common Pitfalls
Understanding hoisting helps avoid common pitfalls such as accessing variables before they are declared. Always declare variables at the top of their scope to minimize confusion and potential errors.
```javascript
// Bad practice
console.log(value); // Output: undefined
var value = 10;
// Good practice
var value;
console.log(value); // Output: undefined
value = 10;
```
### Using `let` and `const`
Prefer using `let` and `const` over `var` to take advantage of block scope and avoid hoisting-related issues. This practice leads to clearer and more predictable code.
```javascript
if (true) {
let blockScopedVar = "I am block scoped!";
console.log(blockScopedVar); // Output: I am block scoped!
}
// console.log(blockScopedVar); // ReferenceError: blockScopedVar is not defined
```
### Functions and Hoisting
Be mindful of the distinction between function declarations and expressions. Use function declarations when you want to take advantage of hoisting, and function expressions when you prefer to control the exact timing of function definition.
```javascript
// Function declaration
hoistedFunction();
function hoistedFunction() {
console.log("This is a hoisted function!");
}
// Function expression
// nonHoistedFunction(); // TypeError: nonHoistedFunction is not a function
var nonHoistedFunction = function() {
console.log("This is not a hoisted function!");
};
```
## Conclusion
Hoisting is a powerful feature of JavaScript that, when understood and used correctly, can lead to more effective and predictable code. By recognizing how variable and function declarations are hoisted and how different types of declarations behave, you can avoid common pitfalls and write cleaner, more maintainable JavaScript code. Always remember to declare your variables and functions at the beginning of their respective scopes, and prefer `let` and `const` over `var` to reduce the risk of unexpected behavior. | whevaltech |
1,391,195 | Boas praticas com Git | Nesse post trago algumas reflexões sobre práticas e ferramentas git que tem ajudado o meu dia a dia,... | 0 | 2023-03-16T12:17:03 | https://dev.to/bernardo/boas-praticas-com-git-jdm | git, productivity, devops, braziliandevs | Nesse post trago algumas reflexões sobre práticas e ferramentas git que tem ajudado o meu dia a dia, espero que te ajudem também.
## Simplifique os históricos de commits com git rebase
Quando você tem duas ramificações em um projeto (por exemplo, uma ramificação de desenvolvimento e uma ramificação principal), ambas com alterações que precisam ser combinadas, o git merge é a maneira natural e direta de unificá-las. A *merge* adiciona o histórico de desenvolvimento de uma ramificação como uma confirmação de mesclagem para a outra. Embora isso preserve os dois históricos em detalhes completos, pode dificultar o acompanhamento do histórico geral do projeto. Em alguns casos, você pode querer um resultado mais simples e limpo.
O git rebase também mescla duas ramificações, mas de maneira um pouco diferente. A git rebase reescreve o histórico de commit de uma ramificação para que a outra ramificação seja incorporada a ela a partir do ponto em que foi criada. Isso cria um commit menos ruidoso e mais linear para essa ramificação. Mas também significa que detalhes potencialmente úteis sobre a outra ramificação e o processo de mesclagem são removidos.
Para esse fim, *rebase* é melhor usado quando você tem várias ramificações privadas que deseja consolidar em um único commit limpo antes de mesclá-lo com uma ramificação pública. Dessa forma, você obtém todos os benefícios de rebase— tornar um histórico de commits mais linear e menos ruidoso — sem ocultar detalhes cruciais sobre o histórico de commits do seu projeto.
## Limpar mesclagens com git merge --squash
Outra maneira de fazer merges e subseqüentes commits menos ruidosos é usando a opção --squash no git merge. --squash pega todos os commits de uma ramificação de entrada e os compacta em um único commit consolidado.
A beleza de uma mesclagem compactada é que você pode escolher como aplicar os arquivos preparados resultantes. Você pode apenas confirmar todo o conjunto de alterações como um ou confirmar alguns arquivos de cada vez em que as alterações estão intimamente relacionadas. Uma mesclagem compactada também é útil se o histórico de confirmação do branch de entrada for útil apenas no contexto desse branch ou se for de um branch privado que será descartado de qualquer maneira.
Assim como no rebase, essa técnica funciona melhor para enviar ramificações internas para o main, mas também é adequada para solicitações pull, se necessário.
## Acelere as buscas de bugs com git bisect
Regressões sutis no código são as mais difíceis de descobrir. Imagine que você acabou de adicionar um teste à sua base de código para perseguir um bug, mas não tem certeza de quando o bug apareceu pela primeira vez e você tem centenas ou até milhares de commits em seu repositório. O git bisect comando permite reduzir bastante a quantidade de código que você precisa pesquisar para encontrar o commit que criou o bug.
Ao habilitar bisect ( git bisect start), você especifica dois pontos em sua base de código para limitar sua pesquisa: um onde você sabe que as coisas estão ruins ( HEAD, normalmente) e outro onde você sabe que as coisas ainda estão boas. bisect verificará um commit no meio do caminho entre o commit ruim e o bom, e permitirá que você execute seus testes. Esse processo de subdivisão binária se repete até que apareça o commit que quebrou as coisas.
git bisect é uma dádiva de Deus para grandes bases de código com históricos de commits longos e complexos, poupando você do trabalho de ter que vasculhar até o último commit na esperança de encontrar seu bug mais cedo ou mais tarde. No mínimo, reduz pela metade a quantidade de pesquisas e testes que você precisa fazer.
## Reaplicar commits com git cherry-pick
Muitos comandos avançados são úteis apenas em circunstâncias estritamente específicas e ignorados com segurança mesmo por usuários moderadamente avançados. Mas quando você se depara com uma dessas circunstâncias específicas, vale a pena conhecê-las.
Considere git cherry-pick. Ele permite que você pegue um determinado commit — qualquer commit, de qualquer branch — e aplique-o a um branch diferente, sem ter que aplicar nenhuma outra alteração do histórico desse commit. Isso é útil em algumas circunstâncias importantes:
- Você fez um commit no branch errado e quer aplicá-lo rapidamente no branch certo.
- Você deseja aplicar uma correção de uma ramificação ao tronco antes de continuar com outro trabalho no código do tronco.
Observe que você tem algumas opções além de aplicar diretamente o commit quando o fizer cherry-pick. Se você passar a --no-commit, por exemplo, o commit escolhido a dedo é colocado na área de preparação do branch atual.
## Organize projetos elegantemente com submódulos Git
Assim como a maioria das linguagens de programação fornece uma maneira de importar pacotes ou módulos, o Git oferece uma maneira de incluir automaticamente o conteúdo de um repositório dentro de outro, um submódulo. Você pode criar um subdiretório dentro de um repositório e preenchê-lo automaticamente com o conteúdo de outro repositório, geralmente referindo-se a um hash de confirmação específico para fins de consistência.
Observe que os submódulos do Git funcionam melhor nas seguintes condições:
- Os submódulos em questão não mudam com frequência ou estão bloqueados para um commit específico. Qualquer trabalho em um submódulo, em vez de um submódulo, deve ser gerenciado separadamente.
- Todo mundo está usando uma versão do Git que suporta submódulos e entende as etapas necessárias para trabalhar com eles. Por exemplo, os diretórios do submódulo nem sempre são preenchidos automaticamente com o conteúdo do repositório do submódulo. Pode ser necessário usar o git submodule update no repositório para atualizar tudo.
## Debugging no Git
Existem várias maneiras de depurar com Git, mas algumas das mais comuns incluem:
- Utilizando o comando "git bisect" para encontrar a commit específica que introduziu um bug no código.
- Utilizando o comando "git revert" para desfazer uma alteração que introduziu um bug.
- Utilizando o comando "git stash" para salvar as alterações atuais sem commitá-las e depois voltar para uma versão anterior do código.
- Utilizando o comando "git log" para verificar o histórico de commits e encontrar a commit específica que introduziu um bug.
- Utilizando o comando "git diff" para comparar as diferenças entre commits e encontrar o que mudou que causou o bug
Esses são apenas alguns exemplos de como o Git pode ser usado para depurar um código. O importante é que o Git é uma ferramenta poderosa e versátil que permite aos desenvolvedores trabalhar de forma colaborativa e garantir a qualidade do código.
## Salvando a vida com git revert
O comando git revert é usado para desfazer as alterações de um commit específico em seu repositório. Ele cria um novo commit com as modificações opostas às do commit original, o que é útil para corrigir erros ou reverter alterações indesejadas. Isso mantém a integridade do histórico do seu repositório, permitindo que você volte a um estado anterior sem perder qualquer trabalho.
Exemplo de uso: git revert <commit> onde <commit> é o código do commit que deseja desfazer.
É importante ter em mente que este comando não remove o commit original, apenas cria um novo commit com as modificações inversas. Além disso, se o commit que você deseja reverter foi feito em uma branch diferente da sua branch atual, é necessário fazer um merge antes de usar o comando git revert. | bernardo |
1,885,001 | Usando Imagens Base Seguras | Escrevi este artigo para compartilhar um pouco do que já aprendi no PICK da LinuxTips. Então, pegue... | 0 | 2024-06-12T01:25:28 | https://dev.to/batistagabriel/usando-imagens-base-seguras-2dc7 | docker, containers | 
Escrevi este artigo para compartilhar um pouco do que já aprendi no [PICK](https://www.linuxtips.io/pick) da [LinuxTips](https://www.linuxtips.io/). Então, pegue sua bebida e me acompanhe.
Tudo começou quando, por vezes, as ferramentas de segurança reportavam vulnerabilidades low/mid e, quando íamos avaliar o que era essa vulnerabilidade, nós sempre acabávamos no grande acordo mental: "não é algo que a gente fez, então não tem como resolver".
Durante as aulas do PICK, conheci a Chainguard. E aí surgiu a ideia de montar este artigo para mostrar como utilizar uma imagem base segura para construir o container da minha aplicação.
Para mostrar isso, vamos containerizar uma aplicação de console bem básica de "hello world" em DotNet ao longo deste artigo, visto que o foco aqui é como montar um Dockerfile para a aplicação de forma mais segura e não a aplicação em si.
## Criando a aplicação
Assumindo que você já tenha o SDK do DotNet instalado e configurado em seu ambiente, vamos abrir nosso terminal e começar a criação do projeto.
Vamos criar nossa aplicação usando o [template `console` da CLI do DotNet](https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-new-sdk-templates#console). Faremos isso utilizando o comando a seguir:
```bash
dotnet new console -o HelloWorldApp
```
Feito isto, vamos para nosso editor de texto preferido para começar a manipular os arquivos contidos no diretório do projeto.
Com seu editor de texto aberto, vamos alterar o arquivo `Program.cs` para que ele tenha nosso "Hello World". Edite seu arquivo para que ele se pareça com o seguinte:
```csharp
namespace HelloWorldApp
{
static class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}
```
## Criando o Dockerfile
Perfeito, agora que você criou nossa aplicação (que tem potencial para hackear a NASA), é hora de criarmos nosso Dockerfile para containerizar nossa aplicação.
_Vale lembrar que o Dockerfile precisa ficar no mesmo nível do arquivo csproj, no nosso caso, dentro do diretório `HelloWorldApp`._
Para construir nosso Dockerfile, além de utilizar imagens base seguras, vamos utilizar um conceito de organização e performance chamado [multi-stage builds](https://docs.docker.com/build/building/multi-stage/).
### Primeira etapa
Sem mais delongas, vamos para a primeira linha do nosso Dockerfile:
```bash
FROM cgr.dev/chainguard/dotnet-sdk:latest AS build
```
A imagem base que estamos utilizando possui um escopo reduzido para que apenas haja dependências que satisfaçam o uso do SDK do DotNet.
Portanto, se comparado com o escopo de uma imagem base alpine, por exemplo, as chances de nosso container ter vulnerabilidades que não dizem respeito apenas às dependências do SDK do DotNet são bem menores. E este é o grande diferencial de utilizar as imagens base da Chainguard.
Ainda sobre a primeira linha, perceba que utilizamos um alias para identificar a etapa que será executada. Neste caso, chamamos a etapa atual de `build`.
Seguindo em frente, para que nós possamos executar nosso comando que irá compilar nossa aplicação e gerar nossa dll (`dotnet publish`), precisaremos antes declarar que nossos arquivos pertencem a um usuário não root para poderem ser compilados. Faremos isto da seguinte forma:
```bash
COPY --chown=nonroot:nonroot . /source
```
Aqui estamos utilizando o comando `COPY` para copiarmos todos os arquivos do diretório atual onde está o Dockerfile, sob as permissões de um usuário que não é root, para um diretório dentro do container chamado `source` que será utilizado posteriormente.
Por se tratar de uma imagem base segura, algumas operações (como o publish no nosso caso) requerem um pouco mais de atenção a níveis de permissão, visto que deixar coisas serem compiladas a um nível elevado levaria por água abaixo toda a segurança da imagem.
Ao final desta etapa, vamos definir nosso diretório de trabalho padrão e realizar o processo de criação da nossa dll que será direcionada para um diretório chamado `Release`. Isto será feito nas linhas a seguir:
```bash
WORKDIR /source
RUN dotnet publish --use-current-runtime --self-contained false -o Release
```
### Etapa final
Agora, nesta etapa, não precisamos mais que haja dependências relacionadas ao SDK; precisamos agora ter recursos referentes ao runtime do DotNet para executar nossa dll. Para isso, vamos utilizar a seguinte imagem base:
```bash
FROM cgr.dev/chainguard/dotnet-runtime:latest AS final
```
Após isso, vamos então partir para a definição do nosso diretório de trabalho padrão e vamos agora utilizar a grande vantagem de se utilizar o multi-stage. Como na etapa de `build` nós já geramos a nossa dll, podemos então copiar nossa dll para a etapa atual para podermos utilizá-la. Vamos fazer isso da seguinte forma:
```bash
WORKDIR /
COPY --from=build /source .
```
Perceba que no comando `COPY` estamos informando que queremos que seja copiado para o contexto raiz `.` o que foi gerado no diretório `/source` da etapa `build`. E é aí que ganhamos organização e performance em nosso Dockerfile, segmentando a criação e reutilização de artefatos.
Por fim, vamos definir qual será nosso comando principal que será executado quando nosso container for iniciado, ou seja, vamos indicar que usemos o DotNet para executar nossa dll. Fazemos isso da seguinte forma:
```bash
ENTRYPOINT ["dotnet", "Release/HelloWorldApp.dll"]
```
### Dockerfile Completo
Com tudo isso feito, nosso Dockerfile final deve se parecer com o seguinte:
```bash
FROM cgr.dev/chainguard/dotnet-sdk:latest AS build
COPY --chown=nonroot:nonroot . /source
WORKDIR /source
RUN dotnet publish --use-current-runtime --self-contained false -o Release
FROM cgr.dev/chainguard/dotnet-runtime:latest AS final
WORKDIR /
COPY --from=build /source .
ENTRYPOINT ["dotnet", "Release/HelloWorldApp.dll"]
```
## Build e Execução da Imagem
Com nosso Dockerfile criado, é hora de fazer o build da nossa imagem e ver se tudo funciona como o esperado (geralmente é aqui que tudo pega fogo). Para fazer isso, estando no mesmo diretório onde nosso Dockerfile está, vamos executar o seguinte comando:
```bash
docker build -t helloworldapp .
```
Após o build concluído, vamos para o momento mais aguardado: a execução de um container que possuirá nossa dll sendo executada. Para isso, utilize o comando:
```bash
docker run --rm helloworldapp
```
## Isso É Tudo, Pessoal
Isto conclui nossa jornada com o uso de imagens base seguras e multi-stage em Dockerfiles. Claramente, você pode se aventurar indo além, por exemplo, criando workflows no GitHub que fazem o scan do código ou do container a cada push/pull request usando ferramentas como o Snyk ou o Trivy.
Agora é com você: abuse e use o que passamos por aqui! Explore outras imagens base, tente entender mais como funcionam, tente refatorar Dockerfiles para utilizar multi-stage. Vá além!
Lembre-se: que a força esteja com você, tenha uma vida longa e próspera e não entre em pânico! Allons-y! | batistagabriel |
1,885,006 | The Role of CAS No.: 26530-20-1 in Modern Chemistry | Introduction Chemistry has plenty of complicated compounds that need recognition of Chemical... | 0 | 2024-06-12T01:24:27 | https://dev.to/walter_davisker_b9f5919a3/the-role-of-cas-no-26530-20-1-in-modern-chemistry-3840 | Introduction
Chemistry has plenty of complicated compounds that need recognition of Chemical Abstracts Solution (CAS) varieties to avoid complication in between the compounds that are actually various. CAS No.: 26530-20-1 is actually a compound distinct in contemporary chemistry along with varied requests. It is actually utilized in production as well as markets that are actually pharmaceutical to name a few areas.
Benefits
CAS No.: 26530-20-1 has actually benefits that are actually different contemporary chemistry. The compound is actually flexible as well as could be utilized for various functions. CAS No.: 26530-20-1 is actually a substance that exists as a dark fluid brownish. One profit of CAS No.: 26530-20-1 is actually its own solubility higher in, creating it simple towards combine with various other compounds. Furthermore, CAS No.: 26530-20-1 is actually an effective representative oxidizing is actually steady under heats, that makes it helpful in different requests.
Development
Development in contemporary chemistry has actually led in the direction of the breakthrough as well as manufacturing of different chemical compounds that are actually brand-brand new compounds. CAS NO 26530-20-1 is actually a development in the area of chemistry, possessing residential or commercial homes that are actually distinct create it helpful in different requests. It is actually a substance originated from a response of 2 compounds that are actually various. The development in the formation of this particular compound has actually resulted in opportunities that are actually brand-brand new chemistry.
Security
When dealing with chemicals, security is actually an issue important. Using CAS No.: 26530-20-1 ought to be actually finished with appropriate treatment, as it is an representative oxidizing can easily trigger serious damages when certainly not handled properly. The compound ought to be actually dealt with along with hand wear covers as well as appropriate devices safety. Furthermore, it ought to certainly not style any type of products that are actually natural as it can easily trigger the product towards combust.
Utilize
CAS No.: 26530-20-1 has actually utilizes that are actually different contemporary chemistry. Among the considerable utilizes of this particular compound is actually its own request in fabric dyeing. It is actually utilized in fabric dyeing towards enhance the color fastness of materials. Furthermore, CAS No.: 26530-20-1 is actually utilized as a whitening representative in the pulp as well as report market. It is actually likewise utilized as a disinfectant in sprinkle therapy vegetations as well as as a fungicide in the market agricultural.
Using
When CAS utilizing no. 26530-20-1, it is actually essential towards comply with the directions offered. The compound ought to be actually kept in an awesome, completely dry out location far from natural products. When blending, it should be actually included gradually towards prevent any type of responses that are actually undesirable. Furthermore, when utilized in fabric dyeing, it ought to be actually been applicable at the focus appropriate accomplish the preferred color fastness.
Solution
Acquiring the solution finest for the cas 26530 20 1 is actually important in accomplishing the very best outcomes. The providers of the compound ought to offer information on ways to keep as well as manage the compound as well as offer the amount appropriate the defined request. Furthermore, the providers ought to offer the security required as well as educating towards manage the compound securely.
High top premium
The quality of CAS No.: 26530-20-1 is actually essential in achieving the preferred outcomes. Low-grade compounds can easily result in undesirable responses when combined with various other compounds, resulting in outcomes that are actually undesired. For that reason, it is actually important towards acquire CAS No.: 26530-20-1 coming from reliable providers. The reliable providers ought to offer outlined specs connected with substance's high top premium towards guarantee it satisfies the demands which could be defined.
Request
CAS No.: 26530-20-1 has actually requests that are actually different contemporary chemistry, as discussed previously. The substance's flexibility has actually created it appropriate for use in different requests, like fabric dyeing, report as well as pulp market, sprinkle therapy vegetations, as well as the market agricultural. Its own ability towards enhance color fastness, disinfect as well as prevent the development of fungus has actually created it an element important of markets.
Source: https://davidskiwalter.blogspot.com/2024/06/the-role-of-cas-no-26530-20-1-in-modern.html | walter_davisker_b9f5919a3 | |
1,885,005 | Crocodile line trading system Python version | Summary People who have done financial trading will probably have an experience. Sometimes... | 0 | 2024-06-12T01:24:24 | https://dev.to/fmzquant/crocodile-line-trading-system-python-version-3pkb | python, trading, cryptocurrency, fmzquant | ## Summary
People who have done financial trading will probably have an experience. Sometimes the price fluctuations are regular, but more often it shows an unstable state of random walk. It is this instability that is where market risks and opportunities lie. Instability also means unpredictable, so how to make returns more stable in an unpredictable market environment is also a problem for every trader. This article will introduce the crocodile trading rules strategy, hoping to inspire everyone.
## What is a crocodile line
The crocodile line is actually three special moving averages, which correspond to the chin of the blue line, the teeth of the red line, and the upper lip of the green line. The chin is a 13-period moving average and moves 8 bars in the future. The tooth is an 8-period moving average and moves 5 bars in the future. The upper lip is a 5-period moving average and moves 3 bars in the future.
## Principle of crocodile line
The crocodile line is a set of technical analysis methods summarized based on geometry and nonlinear dynamics. When the crocodile's chin, teeth and upper lip are closed or entangled, it means that the crocodile is asleep. At this time, we usually stay outside the market until the fragment appears, and only participate in the obvious trend market.
The longer the crocodile sleeps, the more hungry it will be when it wakes up, so once it wakes up, it will open its mouth wide. If the upper lip is above the teeth and the teeth are above the chin, it indicates that the market has entered a bull market and the crocodiles are going to eat beef. If the upper lip is below the teeth and the teeth are below the chin, it indicates that the market has entered a bear market and the crocodiles are going to eat bear meat. Until it is full, it will then close its mouth again (hold and make a profit).
## Crocodile line calculation formula
Upper lip = REF(SMA(VAR1,5,1),3)
Teeth = REF(SMA(VAR1,8,1),5)
Chin = REF(SMA(VAR1,13,1)
Crocodile strategy composition
### Step 1: Write a strategy framework
```
# Strategy main function
def onTick():
pass
# Program entry
def main ():
while True: # Enter infinite loop mode
onTick() # execute strategy main function
Sleep(1000) # sleep for 1 second
```
FMZ using the polling mode, one is the onTick function, and the other is the main function, in which the onTick function is executed in an infinite loop in the main function.
### Step 2: Import Python library
```
import talib
import numpy as np
```
The SMA function is used in our strategy. SMA is the arithmetic mean. There are already ready-made SMA functions in the talib library, so directly import the talib Python library and then call it directly. Because when calling this function, you need to pass in numpy format parameters, so we need to use import to import these two Python libraries at the beginning of the strategy.
### Step 3: Convert K-line array data
```
# Convert the K-line array into an array of highest price, lowest price, and closing price, for conversion to numpy.array
def get_data(bars):
arr = []
for i in bars:
arr.append(i['Close'])
return arr
```
Here we created a get_data function, the purpose of this function is to process the ordinary K-line array into numpy format data. The input parameter is a K-line array, and the output result is processed data in numpy format.
### Step 4: Obtain position data
```
# Get the number of positions
def get_position ():
# Get position
position = 0 # The number of assigned positions is 0
position_arr = _C (exchange.GetPosition) # Get array of positions
if len (position_arr)> 0: # If the position array length is greater than 0
for i in position_arr:
if i ['ContractType'] == 'rb000': # If the position symbol is equal to the subscription symbol
if i ['Type']% 2 == 0: # If it is long position
position = i ['Amount'] # Assigning a positive number of positions
else:
position = -i ['Amount'] # Assigning a negative number of positions
return position
```
Position status involves strategy logic. Our first ten lessons have always used virtual positions, but in a real trading environment it is best to use the GetPosition function to obtain real position information, including: position direction, position profit and loss, number of positions, etc.
### Step 5: Get the data
```
exchange.SetContractType('rb000') # Subscribe the futures varieties
bars_arr = exchange.GetRecords() # Get K line array
if len(bars_arr) < 22: # If the number of K lines is less than 22
return
```
Before acquiring data, you must first use the SetContractType function to subscribe to relevant futures varieties. FMZ supports all Chinese commodity futures varieties. After subscribing to the futures symbol, you can use GetRecords function to obtain K-line data, which returns an array.
### Step 6: Calculate the data
```
np_arr = np.array (get_data (bars_arr)) # Convert closing price array
sma13 = talib.SMA (np_arr, 130) [-9] # chin
sma8 = talib.SMA (np_arr, 80) [-6] # teeth
sma5 = talib.SMA (np_arr, 50) [-4] # upper lip
current_price = bars_arr [-1] ['Close'] # latest price
```
Before calculating the SMA using the talib library, you need to use the numpy library to process the ordinary K-line array into numpy data. Then get the chin, teeth and upper lip of the crocodile line separately. In addition, the price parameter needs to be passed in when placing an order, so we can use the closing price in the K-line array.
### Step 7: Place an order
```
position = get_position ()
if position == 0: # If there is no position
if current_price> sma5: # If the current price is greater than the upper lip
exchange.SetDirection ("buy") # Set the trading direction and type
exchange.Buy (current_price + 1, 1) # open long position order
if current_price <sma13: # If the current price is less than the chin
exchange.SetDirection ("sell") # Set the trading direction and type
exchange.Sell (current_price-1, 1) # open short position order
if position> 0: # If you have long positions
if current_price <sma8: # If the current price is less than teeth
exchange.SetDirection ("closebuy") # Set the trading direction and type
exchange.Sell (current_price-1, 1) # close long position
if position <0: # If you have short position
if current_price> sma8: # If the current price is greater than the tooth
exchange.SetDirection ("closesell") # Set the trading direction and type
exchange.Buy (current_price + 1, 1) # close short position
```
Before placing an order, you need to get the actual position. The get_position function we defined earlier will return the actual number of positions. If the current position is long, it will return a positive number. If the current position is short, it will return a negative number. If there is no position, returns 0. Finally, the buy and sell functions are used to place orders according to the above trading logic, but before this, the trading direction and type also need to be set.
## Complete strategy
```
'' 'backtest
start: 2019-01-01 00:00:00
end: 2020-01-01 00:00:00
period: 1h
exchanges: [{"eid": "Futures_CTP", "currency": "FUTURES"}]
'' '
import talib
import numpy as np
# Convert the K-line array into an array of highest price, lowest price, and closing price, used to convert to numpy.array type data
def get_data (bars):
arr = []
for i in bars:
arr.append (i ['Close'])
return arr
# Get the number of positions
def get_position ():
# Get position
position = 0 # The number of assigned positions is 0
position_arr = _C (exchange.GetPosition) # Get array of positions
if len (position_arr)> 0: # If the position array length is greater than 0
for i in position_arr:
if i ['ContractType'] == 'rb000': # If the position symbol is equal to the subscription symbol
if i ['Type']% 2 == 0: # If it is long
position = i ['Amount'] # Assign a positive number of positions
else:
position = -i ['Amount'] # Assign a negative number of positions
return position
# Strategy main function
def onTick ():
# retrieve data
exchange.SetContractType ('rb000') # Subscribe to futures varieties
bars_arr = exchange.GetRecords () # Get K line array
if len (bars_arr) <22: # If the number of K lines is less than 22
return
# Calculation
np_arr = np.array (get_data (bars_arr)) # Convert closing price array
sma13 = talib.SMA (np_arr, 130) [-9] # chin
sma8 = talib.SMA (np_arr, 80) [-6] # teeth
sma5 = talib.SMA (np_arr, 50) [-4] # upper lip
current_price = bars_arr [-1] ['Close'] # latest price
position = get_position ()
if position == 0: # If there is no position
if current_price> sma5: # If the current price is greater than the upper lip
exchange.SetDirection ("buy") # Set the trading direction and type
exchange.Buy (current_price + 1, 1) # open long position order
if current_price <sma13: # If the current price is less than the chin
exchange.SetDirection ("sell") # Set the trading direction and type
exchange.Sell (current_price-1, 1) # open short position order
if position> 0: # If you have long positions
if current_price <sma8: # If the current price is less than teeth
exchange.SetDirection ("closebuy") # Set the trading direction and type
exchange.Sell (current_price-1, 1) # close long position
if position <0: # If you have short positions
if current_price> sma8: # If the current price is greater than the tooth
exchange.SetDirection ("closesell") # Set the trading direction and type
exchange.Buy (current_price + 1, 1) # close short position
# Program main function
def main ():
while True: # loop
onTick () # execution strategy main function
Sleep (1000) # sleep for 1 second
```
Directly click the link below to copy the complete strategy without configuration:
https://www.fmz.com/strategy/199025
## End
The biggest role of the crocodile trading rule is to help us maintain the same direction as the market when trading, regardless of how the current market price changes, and continue to profit until the consolidation market appears. The crocodile line can be used well with other MACD and KDJ indicators.
From: https://blog.mathquant.com/2020/06/09/crocodile-line-trading-system-python-version.html | fmzquant |
1,884,999 | simple ways to sum an array of numbers in golang | Step 1: Loop through the Array Loop through each element of the array to access its values. Step 2:... | 0 | 2024-06-12T01:23:53 | https://dev.to/toluwasethomas/simple-ways-to-sum-an-array-of-numbers-in-golang-1chb | webdev, go, beginners, programming | Step 1: Loop through the Array
Loop through each element of the array to access its values.
Step 2: Declare the result Variable
Declare a variable result to store the cumulative sum. The type of this variable should match the type of the elements in the array (e.g., int, float64, etc.).
Step 3: Accumulate the Sum
Use the result variable to cumulatively sum each value in the array. For example: result += array[i].
Step 4: Return the Result
After the loop completes, return the result variable which now contains the sum of all elements in the array.
```
func sumArray(numbers []int) int {
result := 0
for i := 0; i < len(numbers); i++ {
result += numbers[i]
}
return result
}
```
Testing our function
```
func TestSumArray(t *testing.T) {
tests := []struct {
name string
numbers []int
expected int
}{
{
name: "Positive numbers",
numbers: []int{1, 2, 3, 4, 5},
expected: 15,
},
{
name: "Mixed numbers",
numbers: []int{-3, 4, -1, 0, 2},
expected: 2,
},
{
name: "Single number",
numbers: []int{10},
expected: 10,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := sumArray(tt.numbers)
if got != tt.expected {
t.Errorf("sumArray(%v) = %v, want %v", tt.numbers, got, tt.expected)
}
})
}
}
```
Run your test with `go test ./...` command via your terminal or use the play button via your IDE
Thanks for reading. Please Like and leave a comment, | toluwasethomas |
1,885,004 | CAS No.: 225708-80-6: Safe Handling Practices | Keep Safe While Using CAS No.: 225708-80-6 What is CAS No.: 225708-80-6? CAS No.: 225708-80-6 is a... | 0 | 2024-06-12T01:20:25 | https://dev.to/walter_davisker_b9f5919a3/cas-no-225708-80-6-safe-handling-practices-3e6m | Keep Safe While Using CAS No.: 225708-80-6
What is CAS No.: 225708-80-6?
CAS No.: 225708-80-6 is a element chemical for a variety of purposes. It is used in industries such as agriculture, pharmaceuticals, and electronics. This compound is also known as Cyclopropane.
Advantages of CAS No.: 225708-80-6
One of this advantages of cas255708-80-6 is that its widely used for its disinfectant and properties that are preservative. It is also used as a material raw the production of various products such as pesticides and medicines. Another advantage is the fact that it is highly effective in destroying bacteria and other microorganisms.
Innovation in CAS No.: 225708-80-6
There has been a complete lot of innovation in the use of CAS No.: 225708-80-6. This is due to its effectiveness in various industries. It is also quite versatile in terms of the range of products it may be used in.
Safety with CAS No.: 225708-80-6
It really is important to note that although CAS NO.:255708-80-6 has many benefits, it is a substance hazardous. Therefore, it is essential to follow handling safe when using it. This will minimize the risk of any accidents or harm being caused.
How to use CAS No.: 225708-80-6
Before using CAS No.: 225708-80-6, it’s essential to read the manufacturer’s instructions and follow them carefully. It is also important to wear appropriate clothing protective as gloves and goggles as well as a mask to avoid any danger of inhalation or contact aided by the skin. The substance should also away be kept from children and pets.
Service, Quality, and Application of CAS No.: 225708-80-6
When choosing a supplier of CAS No.: 255708-80-6, it’s important to consider the quality of the product and the known level of customer service provided by the manufacturer. The supplier should be able to provide information on the best practices for using and handling the substance. It’s also important to consider the use of CAS No.: 225708-80-6. The pharmaceutical industry, or the electronics industry, the substance should be used according to the appropriate protocols whether it’s for usage in agriculture.
Source: https://www.puyuanpharm.com/application/CAS-NO.255708-80-6 | walter_davisker_b9f5919a3 | |
1,884,996 | 3 Ways to Use the @Lazy Annotation in Spring | Does your Spring application take too long to start? Maybe this annotation could help you. This... | 27,602 | 2024-06-12T00:51:57 | https://springmasteryhub.com/2024/06/11/3-ways-to-use-the-lazy-annotation-in-spring/ | java, spring, springboot, programming |
Does your Spring application take too long to start? Maybe this annotation could help you.
This annotation indicates to Spring that a bean needs to be lazily initiated.
Spring will not create this bean at the start of the application. Instead, it will create it only when the bean is requested for the first time.
This allows Spring start-up to be faster. However, the first interaction with the bean can be slow because of the time required to create and inject the bean at runtime.
You can use this annotation directly in the bean class (beans annotated with @Component and other stereotypes). Also, it can be used in methods annotated with @Bean.
It’s possible to annotate a @Configuration class, making all the beans from that class become lazily initiated.
Let’s see some examples of how to use it.
### 1. Using @Lazy Directly in the Class
```java
@Service
@Lazy
public class EmailService {
public EmailService() {
System.out.println("EmailService bean is created!");
}
public void sendEmail(String message) {
System.out.println("Sending email with message: " + message);
}
}
```
### 2. Using @Lazy in a Bean Method
```java
@Configuration
public class AppConfig {
@Bean
@Lazy
public EmailService emailService() {
System.out.println("EmailService bean is being created!");
return new EmailService();
}
}
```
### 3. Using @Lazy with a @Configuration Class
```java
@Lazy
@Configuration
public class AppConfig {
@Bean
public EmailService emailService() {
System.out.println("EmailService bean is being created!");
return new EmailService();
}
}
```
### Use Case Scenarios for @Lazy Annotation
This annotation can be useful when you are working with some beans that are resource-intensive to create.
You could use this annotation, so they don’t affect the startup of your application, making the application become available fast by not loading this bean at the start-up.
Remember this decision is a trade-off, your application may start faster, but it will slow down the resource that uses this resource-intensive bean, in the first usage. Spring will setup the bean that was not created at the application start-up.
Another scenario is to use this annotation in beans that are rarely used.
Let’s say your application has an `EmailService` that needs to send emails once a week.
You won’t need this right away, so it’s fine to set this bean with lazy initialization.
## **Conclusion**
Now you understand how to use @Lazy in your project. Can you find places on your application that you can apply it? Share your thoughts and let me know in the comments!
If you like this topic, make sure to follow me. In the following days, I’ll be explaining more about Spring annotations! Stay tuned!
Follow me! | tiuwill |
1,884,995 | The Future of CAS No.: 26530-20-1 in Industry | The Future of CAS No.: 26530-20-1 in Pharmaceutical Industry Introduction Would you know what CAS... | 0 | 2024-06-12T00:50:16 | https://dev.to/walter_davisker_b9f5919a3/the-future-of-cas-no-26530-20-1-in-industry-lpo | The Future of CAS No.: 26530-20-1 in Pharmaceutical Industry
Introduction
Would you know what CAS No.: 26530-20-1 is? It is a chemical that can be used in lots of markets that are various. CAS No.: 26530-20-1 has a total great deal of benefits, which means it is truly helpful for companies that use it. People are constantly attempting to make new and better points, and CAS No.: 26530-20-1 is a instance great of. It is also important to ensure that points we use are safe, and CAS No.: 26530-20-1 is very safe to use.
Benefits of CAS No.: 26530-20-1
CAS No.: 26530-20-1 has a great deal of benefits that make it useful for lots of markets that are various. Among the greatest benefits is that it may be used for a total great deal of various points. For instance, maybe used in plastics, coverings, and also inks. Another benefit is that it's incredibly stable, which means it will not damage down or change in time.
Development with CAS No.: 26530-20-1
Development means turning up with new and better means to do points. Among the ways people use CAS NO 26530-20-1 is by blending it with various other chemicals to produce products that are new. These products that are new be more powerful, lighter, or more versatile compared to the products we used to use. development.
Safety of CAS No.: 26530-20-1
It is extremely important to create certain that points we use are safe. CAS No.: 26530-20-1 is very safe to use because it does not respond with various other chemicals in hazardous ways. It is also not hazardous to pets or plants, so it will not hurt the environment. why companies use it a lot.
Using CAS No.: 26530-20-1
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Source: https://www.puyuanpharm.com/application/CAS-NO-26530-20-1 | walter_davisker_b9f5919a3 | |
1,884,992 | Deconstructing Search Input Box on Fluent UI's Demo Website… | The search box component that we see on the demo website is actually implemented using... | 0 | 2024-06-12T00:40:43 | https://dev.to/zawhtut/deconstructing-search-input-box-on-fluent-uis-demo-website-4nho | blazor, fluentui, searchbox, autocomplete | The search box component that we see on the demo website is actually implemented using `FluentAutocomplete`. This component combines a text box and a drop-down list box to provide autocomplete functionality.
I want to share my insights on how the `FluentAutocomplete` is implemented on FluentUI's demo website. This will enable us to implement or customize it ourselves. By understanding the underlying structure and functionality, we can tailor the `FluentAutocomplete` to better suit our specific needs and enhance our applications.
Blazor is a web framework that allows C# and .NET developers to create interactive web apps. It enables developers to create rich, modern web applications with a combination of C# code, HTML, and CSS, without relying heavily on JavaScript.
Autocomplete is a feature commonly found in user interfaces that provides suggestions to the user as they type, helping them complete their input more quickly and accurately. In the context of web development, an autocomplete component typically combines a text input field with a dropdown list that displays suggested options based on the user's input.
First, let's navigate to the `Shared` folder in FluentUI's GitHub repository.
You can find the repository here:
```
https://github.com/microsoft/fluentui-blazor/tree/dev/examples/Demo/Shared/Shared
```
Next, we need to locate the search box component in the `DemoMainLayout.razor` file:
```
<div class="search">
<DemoSearch />
</div>
```
The `DemoSearch` element is a Blazor web component implemented in the `DemoSearch.razor` file. By Blazor's convention, the name of the Razor file becomes the component name, allowing it to be used like an HTML tag.
The following code block `FluentAutocomplete` is implemented in `DemoSearch.razor`.
```
<FluentAutocomplete TOption="NavItem"
Width="200px"
AutoComplete="off"
Placeholder="Search everything..."
MaximumSelectedOptions="1"
OptionText="@(item => item.Title)"
@bind-ValueText="@_searchTerm"
@bind-SelectedOptions="_selectedOptions"
@bind-SelectedOptions:after="HandleSearchClicked"
OnOptionsSearch="@HandleSearchInput"
ShowOverlayOnEmptyResults="false">
<OptionTemplate>
<span slot="start">
<FluentIcon Value="@(context.Icon)" Class="search-result-icon" Color="Color.Neutral" Slot="start"/>
</span>
@context.Title
</OptionTemplate>
</FluentAutocomplete>
```
In this code, `TOption` is a generic type parameter representing the type of options that the `<FluentAutocomplete>` component will operate on. In this case, it will be working with the `NavItem` class, which is defined in `NavItem.cs`.
`Width="200px"` : Sets the width of the search box.
`AutoComplete="off"` : Disables autocomplete in the input field.
`Placeholder="Search everything..."` : Sets the placeholder text.
`MaximumSelectedOptions="1"` : Limits the number of selectable options to 1.
Since `NavItem` is used as `TOption`, we can specify `OptionText` using the `Title` property of `NavItem`. This property is used to display for each `NavItem` in the dropdown list.
```
@bind-ValueText="@_searchTerm"
@bind-SelectedOptions="_selectedOptions"
@bind-SelectedOptions:after="HandleSearchClicked"
OnOptionsSearch="@HandleSearchInput"
```
The above code block within the <FluentAutocomplete> component is responsible for establishing data bindings with the methods it will call.
In a Blazor component, C# code is typically written within a `@code { }` block using the `@code` directive. Alternatively, code can be placed in a separate code-behind `.cs` file. By convention, the code-behind file should have the same name as the Razor file with a `.razor.cs` extension, such as `MyComponent.razor.cs`.
Therefore, we can find the `DemoSearch.razor`'s C# code in `DemoSearch.razor.cs`.
This code `@bind-ValueText="@_searchTerm"` will bind the value of the text box to the `_searchTerm`. On the other hand, this `@bind-SelectedOptions="_selectedOptions"` will just set `_selectedOptions`.
Lastly, `OnOptionsSearch` event is an `EventCallback<OptionsSearchEventArgs<TOption>>` that is used to filter the list of options based on the text input by the user. `EventCallBack` is a generic type that allows passing event data to a method in the component. By setting `OnOptionsSearch="@HandleSearchInput"`, we specify that the `HandleSearchInput` method will handle the filtering logic. This method processes the user's input and updates the list of options accordingly. We can see these code implementations in `DemoSearch.razor.cs`.
This should now provide a clear and coherent explanation of how the `FluentAutocomplete` component is implemented and how it works.
The `FluentAutocomplete` component is part of the FluentUI Blazor library, which provides a range of UI components designed for Blazor applications. You can explore more about FluentUI Blazor [here](https://www.fluentui-blazor.net/Autocomplete).
## Additional Resources
- [FluentUI Blazor Official Website](https://www.fluentui-blazor.net/)
| zawhtut |
1,884,991 | Exploring the Use of AI in Web Development | Introduction Artificial Intelligence (AI) has been a buzzword in the technological world... | 0 | 2024-06-12T00:32:39 | https://dev.to/kartikmehta8/exploring-the-use-of-ai-in-web-development-3f6h | webdev, javascript, beginners, tutorial | ## Introduction
Artificial Intelligence (AI) has been a buzzword in the technological world for quite some time now. Its potential to transform various industries is being explored, one of which is web development. With the constantly evolving needs of the online world, the use of AI in web development is gaining popularity. Let us take a closer look at the advantages, disadvantages, and features of this emerging trend.
## Advantages of AI in Web Development
1. **Personalized User Experience:** AI has the capability to analyze data and make predictions, resulting in a more personalized user experience. This helps in attracting and retaining users by catering to their specific needs and preferences.
2. **Automation of Repetitive Tasks:** AI can automate repetitive tasks, reducing the workload for developers and allowing them to focus on more complex aspects of web development.
3. **Enhanced Customer Service:** AI-based chatbots have improved customer service by providing instant responses and engaging users effectively, leading to increased user engagement on websites.
4. **Efficiency in SEO and Content Optimization:** The use of AI algorithms has also improved the efficiency of SEO and content optimization, helping websites rank better and attract more traffic.
## Disadvantages of AI in Web Development
1. **Resource Intensive:** The use of AI in web development requires a significant amount of resources, including advanced hardware and software, and highly skilled professionals to implement and maintain it.
2. **Ethical Concerns:** There are ethical concerns regarding the biases in AI algorithms and their impact on user privacy. Ensuring that AI systems are fair and respect user privacy is a major challenge.
## Features of AI in Web Development
1. **AI-powered Tools and Platforms:** AI-powered web development tools and platforms are making it easier for developers to create responsive and user-friendly websites. These tools can analyze user behavior, generate content, and provide valuable insights for better decision-making.
2. **Content Generation and SEO Automation:** AI applications can automatically generate content and optimize it for search engines, reducing the need for manual input and speeding up the content creation process.
3. **Behavioral Analysis for Improved User Experience:** By analyzing user behavior, AI can help tailor the web experience to the needs and preferences of individual users, enhancing satisfaction and engagement.
## Conclusion
The use of AI in web development has enormous potential to enhance the online experience for users. As with any other technology, it comes with its own set of advantages and disadvantages. By carefully considering these factors, AI can be effectively utilized to bring innovation and efficiency in web development. As it continues to evolve, it is safe to say that AI will play a pivotal role in shaping the future of web development.
| kartikmehta8 |
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1,881,290 | Running Advanced MongoDB Queries In TypeORM | TypeORM is a Javascript/Typescript ORM that works well with SQL databases and MongoDB, which is built... | 0 | 2024-06-12T00:22:17 | https://dev.to/kalashin1/running-advanced-mongodb-queries-in-typeorm-327j | node, database, mongodb, typescript | TypeORM is a Javascript/Typescript ORM that works well with SQL databases and MongoDB, which is built to run in the browser, on the server aka Node.JS, Expo, and every single execution context that utilizes Javascript. TypeORM has excellent support for Typescript while allowing newbies to use it with Javascript.
TypeORM sits as a layer on top of our application and allows us to build our application using Object-oriented programming principles when interacting with our data you can check [the documentation]() to get more information about what TypeORM is. In today's post, we will go over how we can run some complex/advanced queries with TypeORM while working with MongoDB as our Database, and as such we will cover the following;
- Find Where Object property is equal to value
- Find where the field is in an array
- Find where value is a regexp
- Find where field A and field B is equal to a value
- Find where field A is equal to value or field B is equal to another value
- Paginating your queries.
### Find where object property is equal to a value
Let's say we have an Entity with the following structure
```typescript
@Entity()
class User {
@Column()
first_name: string;
@Column()
last_name: string;
@Column()
address: string;
@Column()
standIn: {name: string;phone: string};
@Column()
roles: string[]
}
```
Let's say we want to fetch all the users who have a standIn with the name of John. This is a simple query to run, so we would write the query as thus;
```typescript
import {AppDataSource } from '../app-data-source';
import {User} from '../entity/user';
const getUsersByStandIn = (standIn) => {
return AppDataSource.mongoManager.find(User, {
where: {
"standIn.name": {$eq: standIn}
}
})
}
```
### Find where the field is in an array
Let's say we want to run a query to get all the users with a certain role, say all the contractors.
```typescript
const getUserByPrevillage = (role) => {
return AppDataSource.mongoManager.find(User, {
where: {
role: {
$in: [previllage]
}
}
})
}
```
### Running Regular Expression Checks
Sometimes we might want to run a regular expression check, say we want to find a user by their street address, however, we are not sure that the input string will be the complete address, the user might only enter their street Name or house number so this is what the query will look like;
```typescript
const findUserByAddress = (address) => {
const regexp = new RegExp(address);
return AppDataSource.mongoManager.find(User, {
where: {address}
})
}
```
And that's all it takes to run regular expression checks.
### Find where field A and field B is equal to a value
Sometimes we might want to run a query where we check that a particular field is equal to a value and another field is equal to another value, say we want to get a user by their email and phone number, the query we will write will look like this;
```typescript
const findUserByEmailAndPhone = (email, phone) => {
return AppDataSource.mongoManager.find(User, {
where: {
email: {$eq: email},
$and: [{phone: {$eq: phone }}]
}
})
}
```
### Find where field A is equal to value or field B is equal to another value
There are also scenarios where we want to check that a field is equal to a value or another field is equal to another value, say we want to fetch a user by their email or phone number, and the query for such an operation would look like this;
```typescript
const findUserByEmailOrPhone = (email, phone) => {
return AppDataSource.mongoManager.find(User, {
where: {
email: {$eq: email },
$or: [{phone: {$eq: phone }}]
},
})
}
```
### Paginating your queries.
Lastly, let's look at how we can paginate our queries, this is very important for most applications because fetching all the documents in a collection might be computationally expensive and as such we will need to reduce the amount of data we are trying to retrieve at each point in time. This is my approach to pagination;
```typescript
const getUsers = (limit = 5, page = 1) => {
return AppDataSource.mongoManager.find(User, {
take: limit,
skip: (page - 1) * limit
})
}
```
This is a very simple but very powerful approach, as it handles both forward-tracking and backward-tracking. That's going to be it for this post, what are your thoughts on the queries we addressed, do you have a different way of doing things, I would gladly appreciate your feedback and your experience working with TypeORM and MongoDB. Use the comment section to express your thoughts and I hope you found this useful. | kalashin1 |
1,884,985 | Button Animation | A button design with a hover effect, perfect for calls-to-action or navigation elements. The button... | 0 | 2024-06-12T00:20:00 | https://dev.to/sabeerjuniad/button-animation-2n3f | codepen, animation, css | A button design with a hover effect, perfect for calls-to-action or navigation elements. The button features a smooth animation and a subtle gradient effect, making it a great addition to any web project.
{% codepen https://codepen.io/Sabeer-Junaid/pen/OJYxowy %} | sabeerjuniad |
1,884,983 | Business Loans NZ - Cash Now = Growth Tomorrow 💰🚀⭐ | Starting or expanding a business in New Zealand may require significant financial resources and... | 0 | 2024-06-12T00:18:42 | https://dev.to/businessloansnz/business-loans-nz-cash-now-growth-tomorrow-13jo | business, finance, loans, nz | Starting or expanding a business in New Zealand may require significant financial resources and support. This is where **NZ Working Capital** can step in to provide the essential helping hand with our business loans NZ services designed specifically for New Zealand businesses like yours.
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* Quick approval process
* Funds readily available as soon as tomorrow
* Loan amounts from $5k to $500k
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* Minimal documentation needed
With a straightforward application process and minimal eligibility requirements, getting the financial boost your company requires has never been easier. Let's explore how unsecured [business loans NZ](https://workingcapital.nz/) can transform your business journey in New Zealand.
## Understanding Unsecured Business Loans
Unsecured business loans are a valuable financial tool that can help businesses in New Zealand gain access to much-needed capital without the requirement of collateral. The primary benefit of unsecured loans is that they do not require you to put up assets, making them less risky for business owners concerned about pledging their personal or business property.
### Benefits of Unsecured Business Loans
These loans offer great flexibility and speed in obtaining necessary funds for your business. They provide a quick solution to finance needs without risking your assets. Additionally, unsecured business loans typically have simpler application processes and faster approval times compared to secured loans.
### How Unsecured Loans Differ from Secured Loans
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### Eligibility Criteria for Unsecured Business Loans in New Zealand
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Obtaining an unsecured business loan in New Zealand is relatively straightforward with minimal requirements. Typically, businesses must have a good credit history, steady cash flow, and be in operation for a certain period (often at least six months). Meeting these criteria can increase your chances of being approved for an unsecured loan quickly.
### Features of Unsecured Business Loans
* **Simple Application Process:** Applying for an unsecured business loan is usually hassle-free and requires minimal documentation.
* **Quick Approval:** Businesses can expect fast approval times with funds potentially available within as little as one day.
* **Loan Amounts:** Borrowing ranges from $5k to $500k providing businesses with sufficient capital for various needs.
* **Flexible Terms:** Repayment terms typically range from 3 to 36 months allowing businesses options that fit their financial situation.
* **Competitive Rates:** Unsecured loans often come with competitive interest rates helping businesses manage borrowing costs effectively.
Understanding the benefits, differences from secured loans, eligibility criteria, and key features of unsecured business loans can empower New Zealand businesses to make informed decisions when seeking financial assistance for their growth and development needs.
## Understanding the Need for Additional Funds in Business Operations
Businesses often face situations that require additional funds to manage their operations effectively. Whether it's for working capital, expanding existing ventures, or seizing growth opportunities, having access to extra capital can be crucial for sustaining and growing a business.
### Assessing Working Capital Management
**Do you find yourself struggling to cover day-to-day operational expenses or unexpected costs?** A business loan could provide the financial boost needed to maintain smooth cash flow and ensure your company's ongoing success.
### Funding Expansion Plans
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### Seizing Growth Opportunities
**Have you come across a lucrative opportunity that requires immediate investment beyond your current financial capacity?** Securing a quick approval on a business loan could enable you to capitalize on these opportunities and propel your business forward. In today's competitive marketplace, having access to alternative funding options like unsecured business loans can play a vital role in supporting your objectives. By accurately assessing your financial needs and exploring flexible loan options, businesses in New Zealand can equip themselves with the resources needed to thrive and succeed.
## Financing Options for Businesses
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### Alternative Funding Sources
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* **Government Schemes:** Explore specialized funding programs designed for small businesses, offering support through grants or low-interest loans.
### Why Consider Non-Traditional Financing?
Business owners can benefit from alternative funding options that are often more accessible and faster than traditional bank loans. With these diverse sources of capital, you can navigate cash flow challenges effectively, seize growth opportunities promptly, or address urgent financial needs without lengthy approval processes.
### Embracing Financial Innovation
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## Application Process for Unsecured Business Loans
When considering an unsecured business loan in New Zealand, the application process is streamlined to ensure quick access to necessary funds. Here’s a step-by-step guide to help simplify the application process and potentially boost your chances of approval.
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### Step 5: Submit Your Application
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Once you have prepared all necessary documents and finalized your business plan, submit your application through the lender's preferred method – whether online or in-person. Be prepared to answer additional questions or provide supplementary information if requested during the review process.
By following these steps diligently and positioning your business as a reliable borrower with clear intentions for fund utilization, you increase your chances of obtaining an unsecured business loan successfully. Remember to seek guidance from financial experts or advisors if needed throughout the application process for valuable insights tailored to your unique business circumstances.
## Loan Amounts and Repayment Terms
When considering unsecured business loans in _New Zealand_, the borrowing range typically varies from **$5,000** to **$500,000**, providing businesses with a substantial financial lifeline. The flexibility in loan amounts ensures that companies have access to capital based on their specific needs.
### Factors Influencing Loan Amounts
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Choosing an ideal repayment term is crucial when securing an unsecured business loan in _New Zealand_. With repayment terms ranging between **3 to 36 months**, businesses have the opportunity to align repayments with their cash flow cycles. It is essential to evaluate your business's earning potential and financial stability when deciding on a repayment term.
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By tailoring both the loan amount and repayment terms to your specific business requirements, you create a financial solution that complements your company's growth strategy. Working closely with trusted lenders like _NZ Working Capital_ can help you customize finances that match your business goals while ensuring manageable repayment structures. In conclusion, finding the right balance between loan amounts and repayment terms is vital for leveraging unsecured business loans effectively. By understanding your company's financial needs and objectives, you can make informed choices that support growth and success. Choose wisely, and take advantage of the tailored financing options offered by _NZ Working Capital_.
## Interest Rates & Fees Overview
In the realm of **unsecured business loans in New Zealand**, interest rates play a critical role in deciding which loan product best suits your business needs. At NZ Working Capital, we offer competitive rates designed to support your financial goals and keep costs manageable. Our commitment lies in providing transparent fee structures that serve as a foundation for mutually beneficial partnerships.
### Factors Influencing Interest Rates:
* **Creditworthiness**: Your credit score is a pivotal factor influencing the interest rate you are offered. Demonstrating a strong credit history can positively impact the interest rate you receive.
* **Loan Amount & Term**: The amount borrowed and the duration of the loan can affect interest rates. Generally, higher loan amounts or longer terms may result in slightly higher interest rates.
* **Economic Conditions**: Market fluctuations and economic conditions also influence interest rates. At NZ Working Capital, our team keeps abreast of trends to ensure you receive competitive rates despite external factors.
### Strategies for Securing Favorable Terms:
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2. **Research & Compare**: It's vital to explore various lenders to gauge their offerings thoroughly. NZ Working Capital provides transparent information so you can make an informed decision with confidence.
3. **Negotiate Wisely**: Remember, everything is negotiable! Discussing terms directly with service providers like us may lead to modified offers that suit your needs better
4. **Utilize Collateral (if available)**: While unsecured loans do not require collateral, pledging assets could potentially secure lower interest rates by reducing risk for lenders while working capital help grows your business
Understanding how interest rates and fees are structured empowers businesses to make informed choices when seeking financial assistance from unsecured business loan providers like NZ Working Capital in New Zealand. By prioritizing transparency and offering competitive rates alongside flexible terms, we aim to support businesses on their growth trajectory effectively.
Click to **[Apply Now >>](https://unsecuredbusinessfinance.nz/?utm_source=dev.to)**
## Comparison with Secured Business Loans
When considering financing options for your business, it's essential to weigh the benefits of unsecured business loans against secured loans. Unsecured business loans from NZ Working Capital offer a less risky financial solution compared to secured loans as they do not require collateral.?
### Risk Profile
Secured loans typically involve pledging assets as collateral, which can put those assets at risk if the loan is not repaid. On the other hand, unsecured business loans do not require collateral, making them a safer option for businesses that may not have valuable assets to offer or want to avoid the risk of losing such assets in case of financial difficulties.?
### Collateral Requirements
Secured business loans necessitate providing collateral such as property or equipment to secure the loan amount. In contrast, unsecured business loans from NZ Working Capital eliminate the need for collateral, offering a more accessible financing option and reducing the worry of losing crucial assets in case of defaulting on payments.
### Application Process Complexity
Securing a traditional secured loan can be time-consuming due to the detailed process of assessing and valuing collateral presented by the borrower. Our unsecured business loans boast a streamlined application process without any cumbersome collateral evaluations, enabling quick access to funds for your business needs without unnecessary delay. Click to **[Apply Now >>](https://unsecuredbusinessfinance.nz/?utm_source=dev.to)**
### Flexibility
Secured loans often come with restrictions on how borrowed funds can be used due to the necessity of tying assets to the loan. With an unsecured business loan from NZ Working Capital, you have flexibility in using the funds according to your business requirements without constraints related to specific asset usage.
In summary, when comparing unsecured versus secured business loans, opting for an unsecured solution like those offered by NZ Working Capital can provide businesses with lower risk exposure, simplified application processes, no need for collateral commitments, and more room for flexible fund utilization tailored to their unique operational demands. Making an informed decision based on these factors aligned with your company's circumstances can lead to smarter financial choices benefiting your long-term growth goals.
## Tips for Successful Loan Management
Successfully managing funds obtained through unsecured business loans is crucial for the financial health of your company. Here are some practical tips to help you make the most of your loan:
### Budgeting Techniques
Implementing a detailed budget is essential when managing a business loan. By carefully allocating funds to different aspects of your operations, you can ensure that the borrowed money is used effectively without exceeding your financial capabilities.
### Cash Flow Management Strategies
Maintaining a healthy cash flow is key to sustaining your business while repaying the loan. Monitoring incoming and outgoing finances, negotiating better payment terms with suppliers, and incentivizing early payments from customers are effective strategies to optimize cash flow.
### Timely Repayments without Disruption
Ensuring timely repayments on your business loan is vital to building a good credit history and maintaining positive relationships with lenders. To avoid hampering daily operations, consider setting up automatic payments or creating a separate account specifically for loan repayments.
By adopting these practices and staying disciplined in managing your business loan, you can enhance financial stability and propel growth within your company.
## Utilizing Business Loans Responsibly
Running a business is an exciting endeavor, especially when you have the resources to fuel growth. _Unsecured business loans_ can be valuable tools in achieving your company's long-term objectives - but how can you ensure that you are utilizing these financial resources responsibly?
### **Best Practices for Wise Investment**
When considering taking out a business loan, it's essential to have a clear plan for how you will utilize the borrowed funds. ??? Will these funds be invested in opportunities that will drive growth and boost profits?
* Conduct thorough research on potential investments
* Seek expert advice from financial consultants or advisors
* Create a detailed budget outlining how the borrowed funds will be allocated
### **Minimizing Financial Risks**
While business loans provide the capital needed to expand operations or enhance services, they also come with financial responsibilities. How can you minimize risks associated with borrowing money for your business needs?
1. Implement strict budgeting practices to ensure borrowed funds are used efficiently
2. Regularly monitor financial performance and adjust strategies accordingly
3. Prioritize loan repayments to maintain good credit standing
Click to **[Apply Now >>](https://unsecuredbusinessfinance.nz/?utm_source=dev.to)**
### **Building Sustainable Growth**
Responsible borrowing goes hand in hand with sustainable growth strategies for your business. By investing borrowed funds wisely and managing finances prudently, your company can achieve long-term success without falling into unnecessary debt burdens.
Now that you understand the importance of utilizing business loans responsibly, are you ready to take proactive steps towards growing your company while maintaining strong financial health?
Click to **[Apply Now >>](https://unsecuredbusinessfinance.nz/?utm_source=dev.to)** | businessloansnz |
1,884,980 | Valentine's Card Flip | Check out this Pen I made! | 0 | 2024-06-12T00:10:22 | https://dev.to/enrique_portillo_3af96727/valentines-card-flip-2gc7 | codepen | Check out this Pen I made!
{% codepen https://codepen.io/hluebbering/pen/eYQgdJN %} | enrique_portillo_3af96727 |
1,884,978 | Understanding API Architecture Styles Using SOAP | What is SOAP? SOAP stands for Simple Object Access Protocol. It is a protocol used for exchanging... | 0 | 2024-06-12T00:06:58 | https://dev.to/fabiola_estefanipomamac/understanding-api-architecture-styles-using-soap-324l | **What is SOAP?**
SOAP stands for Simple Object Access Protocol. It is a protocol used for exchanging information in the implementation of web services. SOAP relies on XML (Extensible Markup Language) to format messages and usually relies on other application layer protocols, most notably HTTP and SMTP, for message negotiation and transmission.
**Key Features of SOAP**
1. Protocol-based: SOAP is a protocol, which means it has strict rules for messaging.
2. Language and Platform Independent: SOAP can be used on any platform and with any programming language.
3. Standardized: SOAP has a standardized set of rules, making it a reliable choice for communication between different systems.
**Example of a Simple SOAP Request**
Imagine you want to create a web service that provides weather information. A SOAP request to get the weather for a specific city might look like this:
```
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:web="http://www.example.com/weather">
<soapenv:Header/>
<soapenv:Body>
<web:GetWeather>
<web:CityName>New York</web:CityName>
</web:GetWeather>
</soapenv:Body>
</soapenv:Envelope>
```
In this XML, we have an Envelope, which is the top element in a SOAP message. Inside it, there is a Header (which is empty in this case) and a Body which contains the actual request. The GetWeather request asks for the weather in New York City.
Example of a Simple SOAP Response
The server might respond with the following SOAP message:
```
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Header/>
<soapenv:Body>
<web:GetWeatherResponse>
<web:CityName>New York</web:CityName>
<web:Temperature>25</web:Temperature>
<web:Condition>Sunny</web:Condition>
</web:GetWeatherResponse>
</soapenv:Body>
</soapenv:Envelope>
```
Here, the Envelope and Body are similar to the request. The GetWeatherResponse contains the weather information: the city name, temperature, and condition.
**Conclusion**
SOAP is a protocol used to exchange structured information in the implementation of web services. It is protocol-based, language, and platform independent, and standardized. By using XML for its messages, it ensures a high level of compatibility across different systems and platforms.
| fabiola_estefanipomamac | |
1,884,977 | LOOKING FOR AN EFFICIENT CRYPTO HACKER? CONTACT WEB BAILIFF CONTRACTORS | Losing a significant amount of money, especially through fraudulent means, can be devastating... | 0 | 2024-06-12T00:05:54 | https://dev.to/joyce_caroline_114bcf567a/looking-for-an-efficient-crypto-hacker-contact-web-bailiff-contractors-4854 | beginners | Losing a significant amount of money, especially through fraudulent means, can be devastating emotionally, financially, and psychologically. It's a story that unfortunately many people can relate to, as the allure of quick profits and the promise of financial security can blind even the most cautious investors. For my husband and I, the journey began with the dream of securing our financial future through cryptocurrency investment. Like many others, we sought out opportunities in this rapidly evolving market, hoping to capitalize on its potential for substantial returns. However, what seemed like a promising venture quickly turned into a nightmare. Entrusting our hard-earned money to a broker who claimed to be affiliated with a reputable forex trading firm, we invested a significant portion of our retirement savings and business funds into what appeared to be a legitimate platform. However, as time passed and we attempted to withdraw our earnings, we encountered a series of obstacles that ultimately revealed the true nature of the situation. The broker, instead of facilitating withdrawals, began requesting additional funds under various pretexts, effectively draining our finances and plunging us into debt. The realization that we had fallen victim to a scam was both shocking and distressing, as we grappled with the devastating consequences of our trust being exploited for personal gain. We came across an article highlighting the services of Web Bailiff Contractor. Desperate for a solution, we did research, seeking reassurance that this company could indeed deliver on its promises of recovery. With cautious optimism, we reached out to Web Bailiff Contractor, providing them with the details of our situation and placing our trust in their expertise. What followed was a whirlwind of emotions as we anxiously awaited news of their progress. Remarkably, within a mere 48 hours, Web Bailiff Contractor not only validated our hopes but exceeded our expectations by successfully recovering every penny that had been stolen from us. Their commitment to thorough investigation and relentless pursuit of justice ensured that my husband and I were not only reunited with our lost funds but also granted a sense of closure and relief. The impact of this turnaround cannot be overstated. From the depths of despair, we emerged with a renewed sense of faith in humanity and a profound gratitude for the individuals who helped us reclaim what was rightfully ours. Our experience serves as a powerful testament to the resilience of the human spirit and the importance of seeking assistance in times of crisis. As we reflect on this chapter of our lives, we are compelled to share our story with others, to serve as a beacon of hope for those who find themselves ensnared in similar predicaments. By spreading awareness of the invaluable services provided by Web Bailiff Contractor, we hope to empower others to take action and reclaim control of their financial destinies. In the end, while the scars of this ordeal may linger, they serve as a reminder of our strength, perseverance, and unwavering determination to overcome adversity. With the support of organizations like Web Bailiff Contractor and the solidarity of a community united in the pursuit of justice, there is hope for a brighter tomorrow, free from the shadows of deceit and exploitation.
 | joyce_caroline_114bcf567a |
1,884,783 | Padrão 7-1 do SASS | Arquitetura SASS para elevar o nível do seu projeto. Imagine esta situação: você precisa... | 0 | 2024-06-12T00:00:55 | https://dev.to/yagopeixinho/padrao-7-1-do-sass-1jl7 | sass, patternsass, webdev, scss | > Arquitetura SASS para elevar o nível do seu projeto.
---
Imagine esta situação: você precisa urgentemente alterar a cor de um botão que está destoando completamente do design padrão da plataforma. Você abre seu editor de código, localiza o arquivo HTML, procura pelo botão… e, para sua surpresa, percebe que ele não possui nenhuma classe atribuída.
Como pode um elemento não ter classe, mas ainda assim ter um estilo aplicado? Após alguns minutos de busca, você descobre que existe uma pseudoclasse global que afeta todos os botões na plataforma. Após essa descoberta, você cria uma classe orfã exclusivamente para aquele botão ou insere os estilos inline.
Nesse meio tempo, o Brasil poderia muito bem ter sofrido 7 gols da Alemanha novamente e você ainda não teria finalizado essa mudança. Diferentemente do 7–1 do Brasil X Alemanhã, o Padrão 7–1 do SASS pode te ajudar a economizar tempo e marcar um golaço na hora de abrir aquele _pull request_.
---
## Por que utilizar o Padrão 7–1?
Quando seu código SASS está desorganizado, você acaba perdendo mais tempo procurando arquivos do que realmente aplicando modificações no estilo. Imagine-se navegando por um mar de arquivos, numa busca incansável para o estilo específico que precisa ser ajustado… Esse cenário não apenas consome um precioso tempo, mas também pode resultar em frustações e diminuição da produtividade.
Manter um projeto com uma arquitetura e organização é extremamente importante! É como construir uma casa sobre uma fundação sólida: se a estrutura inicial não for bem estabelecida, cada ajuste futuro se torna uma batalha árdua - Isso torna-se ainda mais desafiador em um ambiente colaborativo, onde diferentes mãos podem moldar e remodelar o código ao longo do tempo.
O padrão 7–1 do SASS não é apenas uma metodologia de organização de arquivos! Podemos considerar ele como uma bússola que guia os desenvolvedores através da clareza de sua organização. Ao adotar o padrão 7–1, você está investindo não apenas na estrutura do seu código, mas em uma produtividade geral.
Podemos considerar o padrão 7–1 como um supermecado bem organizado, onde cada produto tem o seu lugar designado. O padrão 7–1 é como um repositor que categoriza cada produto, facilitando a busca e futuras referências. Ele estabelece uma hierarquia clara de arquivos, separando preocupações de forma lógica e intuitiva.
## Organização de arquivos
Esse padrão consiste em 7 pastas e 1 ficheiro. O ficheiro (geralmente chamado main.scss) é o ficheiro que importa todos os outros ficheiros parciais que devem ser compilados em uma única folha de estilo.
As 7 pastas são:
- _base_
- _components_
- _layout_
- _pages_
- _themes_
- _abstract_
- _vendors_
O ficheiro único é:
- _main.scss_
Cada pasta desempenha um papel crucial em termos de utilidade e organização dentro de um projeto. É crucial ressaltar a importância da conformidade com as nomenclaturas estabelecidas. As sete pastas devem seguir rigorosamente essas nomenclaturas padrão: _"base"_, _"components"_, entre outras. Isso assegura a manutenção de uma consistência e reconhecimento em diversos projetos.
No arquivo principal, todos os estilos parciais serão importados usando a diretiva _@import_, consolidando, assim, nossa estrutura de estilos.
## Vamos entender o que cada pasta faz e sua especificação…
Antes de prosseguir, gostaria de mencionar que disponibilizei o código no GitHub. Fique à vontade para explorá-lo e utilizá-lo da maneira que julgar mais adequada.
{% embed https://github.com/yagopeixinho/sass-7-1-pattern %}
### Base
A pasta `base/` contém estilos básicos e padrões para o projeto. Aqui você pode encontrar um arquivo `_reset.scss` e possivelmente uma folha de estilo como `_base.scss`, que cuida de estilos para toda a aplicação.
### Layout
Na pasta `layout/` estão os estilos para o layout da aplicação. Isso inclui folhas de estilo padrão como `_header.scss`, `_footer.scss`, `_sidebar.scss`, bem como estilos relacionados ao layout, como grades e contêineres.
### Components
A pasta `components/` é dedicada aos componentes que podem ser reutilizados nas páginas. Exemplos de componentes incluem `button.scss`, `modals.scss`, `cards.scss`. É importante notar a diferença entre Components e `Layout`. Enquanto o `Layout` trata dos layouts globais da página, a pasta `Components` lida com componentes menores e reutilizáveis.
### Pages
A pasta `pages/` contém estilos específicos para páginas individuais. Por exemplo, você pode encontrar um arquivo de estilo como `_home.scss` ou `_login.scss`
### Themes
Para aplicações maiores que requerem suporte a vários temas, a estrutura reserva uma pasta para esses temas. Aqui você pode incluir estilos para diferentes temas utilizados na aplicação.
### Abstract
A pasta `abstract/` lida com todas as ferramentas e utilitários do SASS que podem ser utilizados em todo o projeto. Isso inclui arquivos como `_variables.scss`, `_mixins.scss`, `_functions.scss`, entre outros.
### Vendors
Na pasta `vendors/` estão contidos conteúdos externos, como CSS de bibliotecas ou frameworks externos, por exemplo, Normalize, Bootstrap, JQueryUI, etc. Os arquivos de inclusão desses estilos podem ser nomeados como `_normalize.scss`, `_bootstrap.scss`, etc.
## Entendemos para que servem as 7 pastas. Vamos entender sobre o ficheiro principal?
### main.scss
O ficheiro principal (normalmente chamado de `_main.scss`) também sendo o único ficheiro que não possui underscore.
Nesse ficheiro não deve conter nada além de imports de outros ficheiros - Isto pois, é importante preservarmos a legibilidade no ficheiro principal.
Para preservar a legibilidade, o arquivo principal deve respeitar estas diretrizes:
- Um arquivo por _@import_;
- Um _@import_ por linha;
- Sem nova linha entre dois _@imports_ da mesma pasta;
- Uma nova linha após o último _@import_ de uma pasta;
- Extensões de arquivo e _underscores_ iniciais omitidos.
_Abaixo vemos um exemplo de um arquivo main.scss_
```scss
/********************
** Abstracts **/
@import "./abstracts/mixins";
/********************
** Base **/
@import "./base/reset";
/********************
** Components **/
@import "./components/dialogs";
@import "./components/inputs";
/********************
** Layout **/
@import "./layout/header";
@import "./layout/sidebar";
/********************
** Pages **/
@import "./pages/login";
/********************
** Themes **/
@import "./themes/default";
/********************
** Vendors **/
@import "./vendors/normalize";
```
Para ver mais desse código, [clique aqui](https://github.com/yagopeixinho/sass-7-1-pattern).
---
## Estrutura final de um projeto com o Padrão 7–1
A seguir, apresento um exemplo de estrutura de arquivos seguindo o Padrão 7–1 do SASS. É evidente que cada arquivo está devidamente posicionado em sua respectiva pasta. A organização e a divisão de pastas são intuitivas e facilitam a compreensão da estrutura.
```
sass/
|
|– base/
| |– _reset.scss # Reset/normalização
| |– _typography.scss # Regras de tipografia
| ... # Etc...
|
|– components/
| |– _buttons.scss # Botões
| |– _carousel.scss # Carrossel
| |– _dropdown.scss # Dropdown
| ... # Etc...
|
|– layout/
| |– _navigation.scss # Navegação
| |– _grid.scss # Sistema de grid
| |– _header.scss # Cabeçalho
| |– _footer.scss # Rodapé
| |– _sidebar.scss # Barra lateral
| |– _forms.scss # Formulários
| ... # Etc...
|
|– pages/
| |– _home.scss # Estilos específicos para a página inicial
| |– _contact.scss # Estilos específicos para a página de contato
| ... # Etc...
|
|– themes/
| |– _theme.scss # Tema padrão
| |– _admin.scss # Tema de administração
| ... # Etc...
|
|– utils/
| |– _variables.scss # Variáveis Sass
| |– _functions.scss # Funções Sass
| |– _mixins.scss # Mixins Sass
| |– _helpers.scss # Auxiliares de classes e placeholders
|
|– vendors/
| |– _bootstrap.scss # Bootstrap
| |– _jquery-ui.scss # jQuery UI
| ... # Etc...
|
|
`– main.scss # Arquivo principal do SASS
```
## Conclusão
Ao adotar o **Padrão 7–1 do SASS**, os desenvolvedores não apenas organizam seus projetos de forma eficiente, mas também estabelecem um método claro e intuitivo de gerenciar seus estilos.
Assim como a Branca de Neve é acompanhada pelos 7 anões, o arquivo principal de estilo main.scss também é acompanhado por suas 7 pastas, cada uma com suas próprias responsabilidades e especificidades, da mesma forma que cada anão tem suas características únicas.
Mantenha suas pastas estruturadas, e seu código organizado :) | yagopeixinho |
1,886,192 | GenAI Predictions and The Future of LLMs as local-first offline Small Language Models (SLMs) | We’ve been increasingly accustomed to subscription-based economic model, which did not skip the GenAI... | 0 | 2024-07-03T18:01:18 | https://lirantal.com/blog/genai-predictions-the-future-llms-local-first-offline-small-language-models-slm/ | ---
title: GenAI Predictions and The Future of LLMs as local-first offline Small Language Models (SLMs)
published: true
date: 2024-06-12 00:00:00 UTC
tags:
canonical_url: https://lirantal.com/blog/genai-predictions-the-future-llms-local-first-offline-small-language-models-slm/
---
We’ve been increasingly accustomed to subscription-based economic model, which did not skip the GenAI hype, but there are other costs to online remote LLMs and the future, I believe, is in offline Small Language Models (SLMs). That is, until our local devices are capable enough to hosting Large Language Models (LLMs) locally, or the architecture enables hybrid inference.
From Midjourney, taking the world by storm to generate visual content, to ChatGPT itself and other GenAI and LLM use-cases, all fall into the business model of a subscription service. Surprising? not really, given that the tech industry is obsessed with SaaS ever since Salesforce CEO Marc Benioff have championed it nonstop.
However, running GenAI tools in a subscription-based model has more hidden costs than just recurring billing invoices to pay, and this is what I want to discuss in this article and why the future of LLMs lies in an offline-first inference capability approach, perhaps pioneered first with Small Language Models (SLMs) until hardware catches up.
I’m seeing more and more validation and use-cases for running private, local-first LLMs.
## The hidden costs of online third-party LLMs
Let’s break-down the hidden costs of online, remote hosted LLMs, and the challenges of wide-spread adoption that concern business leaders. Most specifically, these issues are centered around the problem of the GenAI service being hosted and owned by a third-party, and the implications of that. As such, there are security risks, such as prompt injection, that are orthogonal to the decision of self-hosting or using a third-party service.
### 1. Privacy
The most obvious cost of online, remotely hosted LLMs by a third-party is privacy.
Whether you’re using a GenAI code assistant tool like GitHub Copilot, or having a general-purpose chat session with OpenAI’s ChatGPT or Google’s Gemini, you’re sending your data to a remote server, which is then processed by the LLM, and the results are sent back to you. This is a privacy nightmare, especially when you consider the fact that LLMs are trained on vast amounts of data, including personal information. Suddenly, concerns such as the following arise:
- Do these companies use the data I send to them for training their models further?
- What if the data I send to them is sensitive? PII data, or confidential information?
- What if the data I send to them is proprietary? Will they use it to their advantage? Or worse, could that data leak into the model and then shared with my competitors?
To solve the really challenging and deeply-rooted business problems, you need to provide that very sensitive data to the LLM as context. Yet doing so, is a hard pill to swallow for many business leaders, especially in the financial, healthcare, and legal sectors. Tech companies are often early adapters, but even they are not rushing too quickly to adopt code assistant tools like Copilot, exactly for these reasons.
### 2. Security
When it comes to security aspects of using a third-party LLM service, the main concern involves the service provider which becomes an external attack surface.
Your organization’s attack surface expands to include the service provider’s infrastructure and systems, being OpenAI and Anthropic as primary examples. Any security vulnerabilities or misconfigurations in the service provider’s environment could potentially be exploited by attackers to gain unauthorized access or conduct other malicious activities. These risks directly impact their customers - you.
Have doubts on how probable security issues are for OpenAI? Let’s review a few:
- Here’s OpenAI write-up from March 2023 on [ChatGPT first security breach and outage](https://openai.com/index/march-20-chatgpt-outage/). The underlying issue was due to the open-source Redis client library `redis-py`. Sonatype offered a [detailed analysis on the redis-py vulnerability](https://www.sonatype.com/blog/openai-data-leak-and-redis-race-condition-vulnerability-that-remains-unfixed).
- The `redis-py` vulnerability was also a contributor to [ChatGPT account takeover attacks](https://securityaffairs.com/144184/hacking/chatgpt-account-takeover-bugs.html).
More [chatter on Reddit](https://www.reddit.com/r/cybersecurity/comments/1da7hp2/comment/l7id9st/) discussion with regards to security concerns of third-party hosted LLMs is also worth reviewing.
### 3. Data leakage
From a developer perspective, a generative AI code assistant took like GitHub Copilot feels like magic sometimes, and a lot of that is due to the fact that it has access to the project’s code as context, which allows it to generate code that is more relevant and accurate. At the same time, this also means that the code you’re working on is sent to a remote server, which is then processed by the LLM on GitHub servers.
It’s not just code you and your colleagues are working on that is sent to the remote server, but also the sensitive API tokens, certs, password and other information that lives in the code project on those `.env` files and configuration files.
### 4. Latency and availability
As LLM usage increase as a foundational API for many applications, the latency and availability of the service become a critical factor. In some business cases, the latency of the service can be a deal-breaker, or a make-or-break factor for the user experience and the overall capability of the application.
For example, if you’re building a real-time chatbot to replace support, telemarketing and such, you can’t afford to have a high latency, as it will make the conversation feel unnatural and frustrating for the user. For a text-based conversation, that to an extent is somewhat tolerable, but what about the future of voice-based conversational AI? The latency will be even more critical and easily noticeable.
Availability is another issue and not one to be taken lightly. LLM services can get disrupted, even with major players like OpenAI, Google, and Microsoft. From an operational perspective, it’s not a question of if, but when, the service will be disrupted. And when it does, it can have a cascading effect on the applications that rely on it, causing a domino effect of failures.
In fact, here’s the past 90 days availability of OpenAI services, as reported by [status.openai.com](https://status.openai.com/) and in adjacent to writing this blog post:
On June 4th, 2024, ChatGPT had an outage that last for a few hours during Tuesday and impacted ChatGPT. Previously, this happened in November 2023 when a ChatGPT outage lasted for 90 minutes and included disruption of OpenAI API services too.
## The rise of offline Small Language Models (SLMs)
Developers and tech workers in general, are often characterized as owners of very capable hardware and these days a house-hold MacBook Pro and other laptops can easily run an 8B parameters Small Language Model (SLM) locally with good inference speed. This is a game-changer, as it allows developers to run LLMs locally, without sending their data to a remote server, and without having to worry about the privacy, data leak, and security implications of doing so.
From Ollama, to llama.cpp and other open-source projects, the rise of offline-powered LLM inference is growing in adoption.
### Predictions and future outlook
- **Local-first, Hybrid-capable and Edge-inference LLMs** : The future of LLMs is in local-first offline inference, with a hybrid-capable remotely hosted over a network, and edge-inference deployed LLMs.
- **Open-source & Open LLMs** : The pre-training of LLMs will be done by large tech companies, but the fine-tuning phase and deployment will be done by developers and businesses, due to being less costly and demonstrating great ROI. Foundational pre-trained models will be open-sourced and available for fine-tuning, deployment, and scrutiny of the model’s training data, weights and biases.
- **Consumer-grade GPU acceleration** : The widespread adoption of local-first inference will further push GPU acceleration and inference compute capabilities to exist as a first-class hardware in consumer-grade devices. Just as we’re taking GPS and WiFi chips for granted in end-user consumer devices, we’ll take GPU acceleration for granted in the future.
- **Micro Fine-Tuning model training** : Fine-grained model training is already becoming a norm, with a model like `deepseek-coder 6.7b` which is fine-tuned for specific code generation tasks. My prediction here is that the next evolution of this will be micro fine-tuning (MFT) which will create even more specialized models such as a code generation model for specific languages (JavaScript, or Python) and specialized frameworks and tooling (think React, or Django).
Where we go from here is a future where LLMs and GenAI are not just a tool for developers, but a tool at everyone’s disposal and widely deployed. _Hopefully_ in a more resilient, secure, privacy-aware, and responsible manner. | lirantal | |
1,812,678 | Welcome Thread - v280 | Leave a comment below to introduce yourself! You can talk about what brought you here,... | 0 | 2024-06-12T00:00:00 | https://dev.to/devteam/welcome-thread-v280-1mmp | welcome | ---
published_at : 2024-06-12 00:00 +0000
---
---
1. Leave a comment below to introduce yourself! You can talk about what brought you here, what you're learning, or just a fun fact about yourself.
2. Reply to someone's comment, either with a question or just a hello. 👋
3. Share your wins from this week in our weekly ["What was your win this week?](https://dev.to/t/weeklyretro) thread. | sloan |
1,851,860 | Understand inheritance types in Django models | Image credits: elifskies Sometimes, when we create Models in Django we want to give certain... | 0 | 2024-06-12T16:46:25 | https://coffeebytes.dev/en/understand-inheritance-types-in-django-models/ | django, python, database | ---
title: Understand inheritance types in Django models
published: true
date: 2024-06-12 00:00:00 UTC
tags: django,python,database
canonical_url: https://coffeebytes.dev/en/understand-inheritance-types-in-django-models/
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/4vdx0zl88zsxsg17oh9g.jpg
---
Image credits: [elifskies](https://www.pexels.com/es-es/@elifskies-53441403/)
Sometimes, when we create Models in Django we want to give certain characteristics in common to several of our models. Probably, the first approach that would come to our mind would be to repeat the fields over and over again. This would bring us two problems; first, we are repeating information; second, if we want to add another field in common we will have to modify each of the models. This problem is solved by Django’s model inheritance.
``` python
# Please notice the repeated field in the two models
from django.db import models
class Product(models.Model):
name = models.CharField(max_length=150)
description = models.TextField()
manufacter = models.ForeignKey(Manufacter, on_delete=models.CASCADE)
modified = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
class Manufacturer(models.Model):
name = models.CharField(max_length=100)
description = models.TextField()
modified = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
# ... other then models with the same fields
```
## Inheritance types in Django
There are three types of inheritance available and each behaves differently at the table level:
- Abstract
- Multi table
- Proxy
For this example I will be using Django version 3.1 and Python 3.7.
## Abstract Inheritance
This type of inheritance allows us to put a variety of fields in common that we want the models that inherit from it to include. To define a model as Abstract just add the _Meta_ class containing an attribute called _abstract_ equal to _True_. **Django will not create any table** for a model with _Meta.abstract = True_.
``` python
from django.db import models
class BasicData(models.Model):
modified = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
class Meta:
abstract = True
class Product(BasicData):
name = models.CharField(max_length=150)
description = models.TextField()
class ShippingMethod(BasicData):
name = models.CharField(max_length=150)
description = models.TextField()
price = models.PositiveIntegerField()
```
In the example above both models will include the _modified_ and _created_ fields, however **Django will not create any tables** for the _BasicData_ model.
## Multi Table Inheritance
In this type of inheritance Django **will create a table for each model** (that’s why it’s called multi-table). It will also join both models automatically by means of an _OneToOneField_ field in the child model.
``` python
from django.db import models
class Place(models.Model):
name = models.CharField(max_length=150)
address = models.CharField(max_length=150)
modified = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
class Cafe(Place):
number_of_employees = models.IntegerField()
speciality_coffee_available = models.BooleanField(default=False)
```
In the example above we may be interested in having both models, we can filter by Place and then we can access the child by its one to one relationship \*\*using its lower case model name.
``` python
myFavoriteCafe = Place.objects.get(name="Matraz cafe")
print("Matraz Cafe has {} employees".format(myFavoriteCafe.cafe.number_of_employees))
```
## Proxy inheritance
This type of inheritance is used to change or extend the behavior of a model. To create it just add the _Meta_ class with the _proxy_ attribute equal to _True_. In this case both models are in the same table and we can create, access, update or delete data using any of its models.
``` python
from django.db import models
class BaseProduct(models.Model):
modified = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
name = models.CharField(max_length=150)
def __str__ (self):
return "{} created at {}".format(self.name, self.created.strftime("%H:%M"))
class OrderedContent(BaseProduct):
class Meta:
proxy = True
ordering = ['-created']
```
In the example above we have a new model that defines a default ordering by means of the ordering attribute. That is, assuming we had a table with data we could access the same data from the Django ORM.
``` python
from app.models import BaseProduct, OrderedContent
# Same data default order
BaseProduct.objects.all()
<QuerySet [<BaseProduct: Eternal Sunshine of the Spotless Mind created at 21:59>, <BaseProduct: Arrival created at 22:00>, <BaseProduct: The imitation game created at 22:01>]>
# Same date inverse order
OrderedContent.objects.all()
<QuerySet [<OrderedContent: The imitation game created at 22:01>, <OrderedContent: Arrival created at 22:00>, <OrderedContent: Eternal Sunshine of the Spotless Mind created at 21:59>]>
```
As you can see we were able to access the same three database objects **from both models** , with the difference that in the _OrderedContent_ model our objects appear sorted in descending order with respect to the _created_ field.
If you want to know more about Django, I can recommend some books. Read my [review of two scoops of django](https://coffeebytes.dev/en/the-best-django-book-two-scoops-of-django-review/), a great book that teaches you good Django Framework practices. | zeedu_dev |
1,851,922 | Debounce and Throttle design patterns explained in Javascript | Image credits to i7 from Pixiv: https://www.pixiv.net/en/users/54726558 Debounce and throttle are... | 0 | 2024-06-09T21:56:56 | https://coffeebytes.dev/en/debounce-and-throttle-in-javascript/ | javascript, designpatterns, algorithms, tutorial | ---
title: Debounce and Throttle design patterns explained in Javascript
published: true
date: 2024-06-12 00:00:00 UTC
tags: javascript,designpatterns,algorithms,tutorial
canonical_url: https://coffeebytes.dev/en/debounce-and-throttle-in-javascript/
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bgij4cayn3903m3s2s0v.jpg
---
Image credits to i7 from Pixiv: [https://www.pixiv.net/en/users/54726558](https://www.pixiv.net/en/users/54726558)
Debounce and throttle are [design patterns](https://coffeebytes.dev/en/design-patterns-in-software/) used to limit the execution of functions, generally they are used to restrict the amount of times an event is fired: click, scroll, resize or other events. Patterns are not exclusive to Javascript; in a previous post I explained how to use throttle to [limit the number of requests received by the nginx server](https://coffeebytes.dev/en/throttling-on-nginx/).
Both patterns generate a function that receives a callback and a timeout or delay.
## Debounce
The debounce pattern postpones the execution of a function until a certain waiting time has elapsed.
Further attempts to execute the function will cancel the pending execution and restart the timeout.
### debounce explanation
The code for debounce in javascript looks like this:
``` javascript
const debounce = (callback, waitTimeInMs) => {
let timeout
return (...args) => {
clearTimeout(timeout)
timeout = setTimeout(()=> callback(...args), waitTimeInMs)
}
}
```
Our debounce function returns a function, which will receive any number of arguments (…args).
This function uses a closure to access the variable timeout. What is timeout? timeout is a _setTimeout_ function, which schedules the execution of our callback for later execution.
But now pay attention to the clearTimeout. Every time we call the debounce function it will clear any scheduled function, so the only way for our callback to run is to wait for the time we passed as an argument.
## Throttle
The throttle pattern sets a waiting time during which no more functions can be called again. Unlike the bounce pattern, the timeout is not reset if we try to call the function again.
### Explanation of throttle
The code for throttle in javascript looks like this.
``` javascript
const throttle = (callback, delay) => {
let timeout
return (...args) => {
if (timeout !== undefined) {
return
}
timeout = setTimeout(() => {
timeout = undefined
}, delay)
return callback(...args)
}
}
```
The throttle function returns a function that will have two sides depending on the timeout status:
- timeout is defined: this means that a function is already scheduled for execution, in this case the function does nothing, i.e. it blocks the execution of new functions by means of an empty return.
- timeout is not defined: if timeout is not defined, we create a _setTimeout_ and assign it to the _timeout_ variable. This function, once its execution time has elapsed, will remove itself from the _timeout_ variable. Subsequently, and to finish, we execute the callback function.
## Other resources on debounce and throttling
- [Debounce and throttling in Typescript](https://charliesbot.dev/blog/debounce-and-throttle)
- [Debounce y throttling applied to the DOM](https://webdesign.tutsplus.com/es/tutorials/javascript-debounce-and-throttle--cms-36783) | zeedu_dev |
1,885,782 | A .NET Developer Guide to XUnit Test Instrumentation with OpenTelemetry and Aspire Dashboard | TL;DR In this guide, we will explored how to leverage XUnit and OpenTelemetry to... | 0 | 2024-06-14T10:57:27 | https://nikiforovall.github.io/dotnet/opentelemetry/2024/06/12/developer-guide-to-xunit-otel.html | csharp, opentelemetry, dotnet, xunit | ---
title: A .NET Developer Guide to XUnit Test Instrumentation with OpenTelemetry and Aspire Dashboard
published: true
date: 2024-06-12 00:00:00 UTC
tags: csharp, opentelemetry, dotnet, xunit
canonical_url: https://nikiforovall.github.io/dotnet/opentelemetry/2024/06/12/developer-guide-to-xunit-otel.html
---
## TL;DR
In this guide, we will explored how to leverage XUnit and OpenTelemetry to instrument .NET test projects. The process of setting up the [XUnit.Otel.Template](https://www.nuget.org/packages/XUnit.Otel.Template) demonstrates the ease with which developers can start instrumenting their tests, making it accessible even for those new to OpenTelemetry or Aspire Dashboard.
**Source code** : [https://github.com/NikiforovAll/xunit-instrumentation-otel-template](https://github.com/NikiforovAll/xunit-instrumentation-otel-template)
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/blog-cover.png" style="margin: 15px;">
</center>
_Table of Contents:_
- [TL;DR](#tldr)
- [Introduction](#introduction)
- [Installation](#installation)
- [Run Tests](#run-tests)
- [Explore the code](#explore-the-code)
- [Results of Test Run](#results-of-test-run)
- [Metrics](#metrics)
- [Conclusion](#conclusion)
- [References](#references)
## Introduction
As discussed in my previous blog post - [Automated Tests Instrumentation via OpenTelemetry and Aspire Dashboard](https://nikiforovall.github.io/dotnet/opentelemtry/2024/06/07/test-instrumentation-with-otel-aspire.html), we can utilize OpenTelemetry and Aspire Dashboard to gain valuable insights into the execution of our tests. This allows us to collect and analyze data over time, enabling us to identify potential anomalies.
Considering the positive response from the community, I have taken the initiative to enhance the existing approach and create a reusable starter template for everyone to benefit from.
## Installation
```bash
❯ dotnet new install XUnit.Otel.Template::1.0.0
# The following template packages will be installed:
# XUnit.Otel.Template::1.0.0
# Success: XUnit.Otel.Template::1.0.0 installed the following templates:
# Template Name Short Name Language Tags
# ------------- ---------- -------- -------------------------
# XUnit Otel xunit-otel [C#] XUnit/Tests/OpenTelemetry
```
Generate:
```bash
❯ dotnet new xunit-otel -o $dev/XUnitOtelExample01 -n XUnitOtelExample
# The template "XUnit Otel" was created successfully.
```
## Run Tests
Now let’s navigate to the project directory and run test project with additional option (environment variable really) to include warmup trace. Warmup trace is a special trace that shows how much time it takes to configure dependencies:
```bash
❯ XUNIT_OTEL_TRACE_WARMUP=true dotnet test
# Restore complete (1.2s)
# You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy
# XUnitOtelExample succeeded (4.9s) → bin\Debug\net8.0\XUnitOtelExample.dll
# XUnitOtelExample test succeeded (2.8s)
# Build succeeded in 9.2s
# Test run succeeded. Total: 3 Failed: 0 Passed: 3 Skipped: 0, Duration: 2.8s
```
Let’s navigate to [http://localhost:18888/traces](http://localhost:18888/traces) to see the results of test execution.
☝️ Aspire Dashboard is automatically started based on [Testcontainers](https://dotnet.testcontainers.org/) setup as part of `BaseFixture`.
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/initial-traces.png" style="margin: 15px;">
</center>
As you can see, there are two traces one for test run and one for warmup.
### Explore the code
Before we move further let’s explore the content of exemplary test suit.
```csharp
[TracePerTestRun]
public class ExampleTests(BaseFixture fixture) : BaseContext(fixture)
{
[Fact]
public async Task WaitRandomTime_Success()
{
// ...
}
[Fact]
public async Task WaitRandomTime_ProducesSubActivity_Success()
{
// ...
}
[Fact]
public async Task WaitRandomTime_AsyncWait_Success()
{
// ...
}
}
```
**WaitRandomTime\_Success** : This test waits for a random duration between 100 and 500 milliseconds and then asserts that the operation completes successfully. Note, the special method called `Runner`. It is intended to wrap the asserted code so we can capture exceptions and enrich the traces with additional data such as exception message, trace, etc.
```csharp
[Fact]
public async Task WaitRandomTime_Success()
{
// Given
int waitFor = Random.Shared.Next(100, 500);
TimeSpan delay = TimeSpan.FromMilliseconds(waitFor);
// When
await Task.Delay(delay);
// Then
Runner(() => Assert.True(true));
}
```
**WaitRandomTime\_ProducesSubActivity\_Success** : Similar to the first, but it waits for a shorter random duration (between 50 and 250 milliseconds). It also starts a new activity named “SubActivity”, logs an event indicating a delay has been waited for, and sets a tag with the delay duration. The test asserts success after the wait. This example demonstrate how to add additional traces to test suit if needed.
```csharp
[Fact]
public async Task WaitRandomTime_ProducesSubActivity_Success()
{
// Given
using var myActivity = BaseFixture.ActivitySource.StartActivity("SubActivity");
int waitFor = Random.Shared.Next(50, 250);
TimeSpan delay = TimeSpan.FromMilliseconds(waitFor);
// When
await Task.Delay(delay);
myActivity?.AddEvent(new($"WaitedForDelay"));
myActivity?.SetTag("subA_activity:delay", waitFor);
// Then
Runner(() => Assert.True(true));
}
```
**WaitRandomTime\_AsyncWait\_Success** : This test is partially shown. Like the others, it waits for a random duration between 50 and 250 milliseconds then within a Runner method, waits for the delay again before asserting a condition that is always true. This demonstrates asynchronous `Runner` execution.
```csharp
[Fact]
public async Task WaitRandomTime_AsyncWait_Success()
{
// Given
int waitFor = Random.Shared.Next(50, 250);
TimeSpan delay = TimeSpan.FromMilliseconds(waitFor);
// When
await Task.Delay(delay);
// Then
await Runner(async () =>
{
await Task.Delay(delay);
Assert.True(true);
});
}
```
### Results of Test Run
Here is the result of trace output, as you can see, every test has it’s own trace and we can see how tests are executed sequentially by XUnit:
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/test-run.png" style="margin: 15px;">
</center>
Now, let’s modify the `WaitRandomTime_AsyncWait_Success` test to intentionally cause it to fail. This will allow us to observe how the test framework displays failed tests:
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/trace-with-error.png" style="margin: 15px;">
</center>
Below are the details of the test run. Failed tests are readily identifiable on the Aspire Dashboard, where each failed test is accompanied by an _Trace Event_ with exception details. This event provides detailed insights into the reasons behind the test failure.
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/trace-with-error-details.png" style="margin: 15px;">
</center>
### Metrics
These metrics highlight the execution time on a per-test and per-class basis, categorized by tags.
<center>
<img src="https://nikiforovall.github.io/assets/xunit-otel/metrics.png" style="margin: 15px;">
</center>
The P50 percentile, also known as the median, represents the **middle value** of a dataset when it’s sorted in ascending order. In the context of test execution, the P50 percentile for execution time tells you that:
- **50% of your tests complete faster than this time.**
- **50% of your tests complete slower than this time.**
Here’s how you can use the P50 percentile for test execution:
**1. Performance Benchmark:**
- The P50 provides a good representation of the “typical” test execution time.
- You can use it as a baseline to compare performance over time. For example, if your P50 increases significantly after a code change, it might indicate a performance regression.
**2. Setting Realistic Expectations:**
- Instead of focusing on the absolute fastest or slowest tests, the P50 gives you a realistic idea of how long most tests take to execute.
**3. Identifying Areas for Improvement:**
- While the P50 represents the median, a large difference between the P50 and higher percentiles (like P90 or P95) indicates a wide spread in execution times.
- This suggests that some tests are significantly slower than others, and you might want to investigate those outliers for potential optimizations.
**Example:**
Let’s say your test suite has a P50 execution time of 200 milliseconds. This means:
- Half of your tests finish in under 200 milliseconds.
- Half of your tests take longer than 200 milliseconds.
**In summary,** the P50 percentile provides a valuable metric for understanding the typical performance of your tests and identifying areas for optimization. It helps you set realistic expectations, track performance trends, and make informed decisions about your testing process.
## Conclusion
In this guide, we’ve explored how to leverage XUnit and OpenTelemetry to instrument our .NET test projects, providing a deeper insight into our test executions with the Aspire Dashboard. By integrating these tools, developers can gain valuable metrics and traces that illuminate the performance and behavior of tests in a way that traditional testing frameworks cannot match.
The process of setting up the `XUnit.Otel.Template` demonstrates the ease with which developers can start instrumenting their tests, making it accessible even for those new to OpenTelemetry or Aspire Dashboard. The examples provided show not only how to implement basic test instrumentation but also how to enrich our tests with additional data, such as custom activities and events, to gain more detailed insights.
The ability to visualize test executions and metrics on the _Aspire Dashboard_ transforms the way we perceive and interact with our test suites. It allows us to quickly identify and address failures, understand performance bottlenecks, and improve the reliability and efficiency of our tests over time.
As we continue to evolve our testing strategies, the integration of OpenTelemetry and Aspire Dashboard with XUnit represents a significant step forward in achieving more observable, reliable, and insightful test suites. This guide serves as a starting point for developers looking to enhance their testing practices with these powerful tools.
## References
- [https://github.com/NikiforovAll/xunit-instrumentation-otel-template](https://github.com/NikiforovAll/xunit-instrumentation-otel-template)
- [https://nikiforovall.github.io/dotnet/opentelemtry/2024/06/07/test-instrumentation-with-otel-aspire.html](https://nikiforovall.github.io/dotnet/opentelemtry/2024/06/07/test-instrumentation-with-otel-aspire.html) | nikiforovall |
1,884,800 | Guia de instalação do Proxmox VE | Neste guia, você vai aprender a instalar o Proxmox VE de forma simples! Para acompanhar minha... | 0 | 2024-06-11T23:45:59 | https://dev.to/hei-lima/guia-de-instalacao-do-proxmox-ve-3d0l | ledscommunity, devops, beginners, proxmox | Neste guia, você vai aprender a instalar o Proxmox VE de forma simples!
Para acompanhar minha experiência escolhendo e instalando um gerenciador de VMs em um servidor, leia este artigo: https://dev.to/hei-lima/a-experiencia-2hf6
---
## Índice
1. [O Proxmox](#proxmox)
2. [Começando a instalação](#starting)
3. [Configurando a instalação (Graphical)](#instalation)
4. [Finalizando a instalação](#finishing)
---
## O Proxmox <a name="proxmox"></a>
O Proxmox VE (Virtual Environment) é uma plataforma de virtualização para servidores, ele integra tecnologias hypervisor como KVM e LXC. Ele também possui uma interface web onde você pode manejar, criar e remover VMs. Tudo simples e de forma integrada. Ele tem sua própria distro Linux baseada em Debian.
## Começando a instalação <a name="starting"></a>
- Verifique se sua máquina atende aos [requisitos](https://www.proxmox.com/en/proxmox-virtual-environment/requirements). Você também irá precisar de um pen drive com ao menos 2GB de armazenamento. A instalação é muito melhor quando é feita em bare-metal. Ou seja, instalada diretamente em um servidor ao invés de virtualizada.
- Baixe a [ISO](https://www.proxmox.com/en/downloads/proxmox-virtual-environment/iso/proxmox-ve-8-2-iso-installer) do Proxmox VE 8.2
- Grave a ISO do Proxmox em um pen drive com seu programa de preferência. No Windows, recomendo o [Rufus](https://rufus.ie/pt_BR/). Em Linux, recomendo o [Ventoy](https://www.ventoy.net/en/download.html). **Grave a ISO no modo DD**
- Insira o pen drive no computador
- Na BIOS do seu computador, mude o drive de boot para o pen drive com a imagem.
- Ligue o computador
- Aguarde a tela de instalação aparecer
## Configurando a instalação (Graphical) <a name="instalation"></a>
A forma mais simples de instalar é com o instalador gráfico. Se você, por algum motivo, não consegue instalar graficamente, siga [esse guia](https://medium.com/devops-dudes/proxmox-101-8204eb154cd5)
- Dê enter na opção Install Proxmox VE (Graphical)
- Se tudo der certo, você verá uma tela de EULA. Com um mouse, leia e aceite os termos para prosseguir
- Verifique o disco de instalação e mude-o se preciso **(TODOS OS DADOS DESTE DISCO SERÃO REMOVIDOS)**. Você pode mudar as opções de formatação em options (swapsize, tamanho do disco, etc). Clique em next para prosseguir
- Verifique a _time zone_ (fuso horário) e o layout do teclado. Se você possui uma conexão com a internet, provavelmente essas opções já estarão preenchidas para você. Clique em next para avançar
- Crie uma senha, confirme a senha (digitando-a de novo corretamente) e insira um Email do admin. **NÃO ESQUEÇA ESSA SENHA E NÃO COMPARTILHE COM NINGUÉM**. Essa senha é demasiadamente importante, pois ela permite acesso a interface web e é a senha do usuário root do bash. O Email serve para alertas importantes do sistema, portanto, insira um válido e que você tenha acesso. Clique em next para avançar
- Mude as configurações de rede ou deixe-as como está. (isso pode ser trocado no futuro). O DHCP maneja as configurações por padrão. Clique em next para avançar
- Verifique as opções de instalação. Lembre-se que se você cometeu um erro, pode clicar em previous para voltar uma seção ou abort para abortar a instalação. Se tudo estiver certo, clique em next
- Aguarde a instalação acabar. Note que é comum ela ficar travada em 3% por vários minutos (até 20), até em hardwares modernos.
- Quando terminar a instalação, retire o pen drive e reinicie o dispositivo.
## Finalizando a instalação <a name="finishing"></a>
Com a instalação finalizada, você pode entrar na interface web inserindo o url que o terminal mostra na tela (geralmente no formato https://[IP]:8006/), ou usar o Linux logando normalmente com o root na máquina.
Para entrar na interface web, use root como login e use a mesma senha criada e dar OK no aviso.
Pronto! Esta foi a instalação do Proxmox. Parabéns!
Fique de olho na #ledscommunity para mais tutoriais. Em breve, um de criação de VMs no proxmox! | hei-lima |
1,884,970 | I just made React/Next Design Pattern Repo | This template is including file structure, edit pattern and abstraction to edit React Component more... | 0 | 2024-06-11T23:36:16 | https://dev.to/lif31up/i-just-made-reactnext-design-pattern-1mlb | This template is including file structure, edit pattern and abstraction to edit React Component more easily. I'm still researching on it.
link to the repo
https://github.com/lif31up/next-template | lif31up | |
1,884,958 | Burn To Earn: What is The Secret Formula? | You probably think I’m going to tell you to burn fat or get moving if you want to earn more, but no,... | 0 | 2024-06-11T23:06:35 | https://dev.to/wulirocks/burn-to-earn-what-is-the-secret-formula-2g00 | web3, blockchain, webdev, nft | You probably think I’m going to tell you to burn fat or get moving if you want to earn more, but no, not today.
The burning I’m talking about here doesn’t require any physical activity.
It’s all about clicking the right button at the right moment.
Burning an NFT means deleting it forever, and I’ll show you how this app helps you earn extra cash for doing so.
If you enjoy making money by clicking around all day, like I do, and you’re not ashamed of it, then this is for you!
> What’s the best way to learn about MERN and Blockchain development? By building a real-world project, of course!
Over the past few months, I’ve been exploring the MERN and Blockchain development stacks. This is what happened…
Now, let me show you how I used [Thirdweb](https://thirdweb.com/) services to build an NFT project that rewards users for burning their NFTs in a new and innovative way.
###What is it?
>The Wulirocks app is a blockchain-based online NFT card collection game that rewards you with $USDT.
Initially, players will be rewarded with $USDT, a widely recognized digital currency, allowing us to focus on building a solid foundation for our community.
In the future, we plan to transition to our own token, $WU, which can be converted. This approach will allow us to add a layer of speculation to the game, but we believe it’s essential to prioritize stability and reliability in our early stages.
As seen in the GIF above, all the NFTs in the collection will appear on the right side of the screen, regardless of whether you own them or not. This allows you to test different combinations and see the rewards associated with each one.
> With this feature, you can experiment and strategize your way, buying and selling according to your needs, to become the best earner.
As the supply chain evolve, with new NFTs being minted regularly. More NFTs are created or burned, the individual value of each NFT will have a different weight in the reward calculation algorithm.
In the above example:
* you own 0 NFT #27. The available supply for that NFT is 8.
* you own 2 NFT #28. The available supply for that NFT is 11.
###How Many Collectible NFT are there?
We will start with 275 NFTs or character parts available in this collection.
> These NFTs are ERC1155 tokens, a standard for tokenization, which means that each design can exist multiple times.
For example, some head models exist in a single instance, while others have a supply of 10.
###Ready to burn your 5 NFTs to earn a reward?
>As you can see in the GIF below, simply press the claim button to initiate the burn process so fund can be transferred to your address.
The burn process is fully on-chain and performed by the Burn To Earn smart contract. This simple contract has been audited by [Thirdweb](https://thirdweb.com/) and will be made public later on.
>A smart contract is a program that lives on the blockchain and automatically perform transaction without the intervention of any human or middle man.
**Please note that you’ll need to have all 5 required NFTs for the combo before attempting to burn them.** If you’re missing any NFTs, the function won’t work.
Wulirocks DAPP recording. source: Author
###Which Blockchain?
Currently the DAPP is running on the Sepolia Testnet, but we did not decided yet on which blockchain this would be finally deployed.
###What are the critical factors?
* Decent network: we want a blockchain with a decent network, as it should be reliable and able to handle a reasonable volume of transactions.
* Not too congested: we want to avoid blockchains that are frequently congested, which can lead to slow transaction processing times and high fees.
* Low fees: we are looking for a blockchain with low fees, which will make it more cost-effective for users.
That is it for now! If you’re new to crypto or have questions about the terms or ideas expressed here, feel free to reach out directly or leave a comment — it may benefit others with similar concerns.
Make sure to [subscribe](https://wulirocks.substack.com/subscribe) so you get notified of upcoming dates regarding the launch of the NFT collection and the app, as well as potential giveaways.
Subscribe for free to stay updated on Wulirocks and support the brand’s growth!
Support my writing by buying me a coffee for just 2€! Your small contribution helps me continue sharing valuable experiences and insights on a broad range of subjects. Thank you for your support! [Buy me a coffee](https://buymeacoffee.com/wulirocks) | wulirocks |
1,884,969 | Hosting websites with ipv6 on Hetzner servers | I had to set up a website on hetzner cloud with debian, while having to use an ipv6 address. I... | 0 | 2024-06-11T23:33:51 | https://dev.to/georg4313/hosting-websites-with-ipv6-on-hetzner-servers-57e0 | hosting, ipv6, hetzner | I had to set up a website on hetzner cloud with debian, while having to use an ipv6 address.
I struggled for some time but then stumbled on a [blog post](https://www.blunix.com/blog/ipv6-on-hetzner-cloud-server-for-hosting-a-website.html) that covered the same topic.
The amount of time it saved me with not having to figure all the details out is insane, if you're also trying to set this up you should check it out.
genuinely hope for everyone to just stumble on a tutorial for the exact thing they are doing. | georg4313 |
1,884,965 | [Game of Purpose] Day 24 | Today I made my drone animate propeller rotation when it's flying. Well, for now it's rotating only 1... | 27,434 | 2024-06-11T23:19:57 | https://dev.to/humberd/game-of-purpose-day-24-27ik | gamedev | Today I made my drone animate propeller rotation when it's flying. Well, for now it's rotating only 1 of 4, because I didn't figure out how to efficiently trigger events for all of Child Actors of specific type.
{% embed https://youtu.be/tXP4WcLtmh0 %}
Below you can see my pain point. Too many nodes just to trigger event to one propeller, and I have 3 more. There must be a better way.
Anyway, I cut the propeller from the drone mesh to make a blueprint, which would make it constantly rotate. I needed to use Blender, because a propeller extracted using Modeling Mode in Unreal had a broken pivot point (not in the center) and Blender did the work. Then I moved 4 instances of that Propeller blueprint and will make them rotate.
| humberd |
1,884,960 | How to Set Up a CI/CD Pipeline with GitLab: A Beginner's Guide | Introduction to CI/CD and GitLab In modern software development, Continuous Integration... | 0 | 2024-06-11T23:18:39 | https://dev.to/arbythecoder/how-to-set-up-a-cicd-pipeline-with-gitlab-a-beginners-guide-46b9 | gitlab, devops, beginners, webdev | #### Introduction to CI/CD and GitLab
In modern software development, Continuous Integration (CI) and Continuous Deployment (CD) are essential practices. CI involves automatically integrating code changes into a shared repository multiple times a day, while CD focuses on deploying the integrated code to production automatically. These practices help ensure high software quality and faster release cycles.
GitLab is a comprehensive DevOps platform that integrates source control, CI/CD, and other DevOps tools. This guide will walk you through setting up a simple CI/CD pipeline on GitLab, perfect for beginners and intermediate users.
#### Prerequisites and Setup
**Tools Needed:**
- **GitLab Account**: Sign up at [GitLab](https://gitlab.com).
- **Git Installed**: Download and install Git from [Git's official site](https://git-scm.com/).
**Basic Knowledge Required:**
- Basic understanding of Git commands.
- Familiarity with GitLab's interface.
#### Creating a GitLab Repository
**1. Log In to GitLab**:
- Go to [GitLab](https://gitlab.com) and log in with your credentials.
**2. Create a New Project**:
- Click on the "New Project" button.
- Select "Create blank project".
- Fill in the project name (e.g., `MyFirstPipeline`), description (optional), and set the visibility level.
- Click "Create project".
**3. Clone the Repository**:
- Copy the HTTPS clone URL from the GitLab repository page.
- Open your terminal and run:
```sh
git clone <your-repository-URL>
cd <your-repository-name>
```
**4. Add Initial Files**:
- Create a simple application or add existing files to the repository.
- For example, create an `index.html` file for a static website:
```sh
echo "<!DOCTYPE html>
<html>
<head>
<title>Welcome to My First Project</title>
</head>
<body>
<h1>Hello, World!</h1>
<p>This is my first static website hosted using GitLab CI/CD.</p>
</body>
</html>" > index.html
```
**5. Commit and Push the Changes**:
- Add the file to your repository:
```sh
git add index.html
git commit -m "Add index.html for static website"
git push origin main
```
#### Writing a `.gitlab-ci.yml` File
The `.gitlab-ci.yml` file defines the stages, jobs, and scripts for your CI/CD pipeline. Here's a simple configuration:
** Create the `.gitlab-ci.yml` File**:
- In the root directory of your project, create a file named `.gitlab-ci.yml`.
- Open the file and add the following content:
```yaml
stages:
- build
- deploy
build_job:
stage: build
script:
- echo "Building the project..."
- echo "Build complete."
deploy_job:
stage: deploy
script:
- echo "Deploying the project..."
- echo "Deploy complete."
```
** Commit and Push the Changes**:
- Add the file to your repository:
```sh
git add .gitlab-ci.yml
git commit -m "Add CI/CD pipeline configuration"
git push origin main
```
#### Running and Monitoring the Pipeline
1. **Trigger the Pipeline**: The pipeline will automatically trigger when you push the `.gitlab-ci.yml` file.
2. **Monitor the Pipeline**:
- Go to your GitLab project page.
- Navigate to **CI/CD > Pipelines**.
- You should see a new pipeline triggered by your recent push.
- Click on the pipeline to monitor its progress and view job logs.
3. **Check Job Logs**:
- View the output logs for each job (build and deploy) to ensure they are executing correctly.
#### Conclusion
Congratulations! You've successfully set up a basic CI/CD pipeline using GitLab. Here’s a quick summary of what we did:
- **Created a GitLab repository**.
- **Added a simple `index.html` file** to the repository.
- **Configured a `.gitlab-ci.yml` file** to define our CI/CD pipeline stages and jobs.
- **Triggered and monitored the pipeline**. | arbythecoder |
1,884,961 | AWS Amplify Gen2 Authentication | Some times the guides does not help much and something is missing to make thinks work. In this case,... | 0 | 2024-06-11T23:15:01 | https://dev.to/ldbravo/aws-amplify-gen2-authentication-cp6 | aws, amplify, react, authentication | Some times the guides does not help much and something is missing to make thinks work. In this case, this guide will help setting up a new project in AWS Amplify with Cognito Authentication.
There we go with the required steps:
1. Create a GitHub or CodeCommit repo.
2. Create a React App, in my case I'm using Vite.
```
npm create vite@latest my-app-name
npm install
```
3. Add amplify to the new React app
```
npm create amplify@latest
```
4. Commit the changes to master/main branch
5. Create Amplify app in the AWS Console, select your repository and the master/main branch.
6. Once the deployment has been completed, download the file amplify_outputs.json and put it on the root of your project.
7. Add the authentication component, it can be found here: https://docs.amplify.aws/react/build-a-backend/auth/set-up-auth/
And that's it, now you can use Cognito authentication in your React app. I spent some time struggling with backend deployment on Amplify but it was because I didn't follow the correct order on this steps, we need first to add the Amplify files (step 3) and then deploy the app (step 5), otherwise the backend deployment will not be there.
See you in a next post! | ldbravo |
1,884,959 | What is Node.js? | Node.js is a server-side scripting environment that uses JavaScript for backend... | 0 | 2024-06-11T23:09:40 | https://dev.to/satyapriyaambati/what-is-nodejs-2dl0 | Node.js is a server-side scripting environment that uses JavaScript for backend programming.
[https://youtu.be/H9M02of22z4?si=QxsIqqoH_MI-cTjT] | satyapriyaambati | |
1,884,953 | Extracting the Sender from a Transaction with Go-Ethereum | When working with Ethereum transactions in Go, extracting the sender (the address that initiated the... | 0 | 2024-06-11T22:51:11 | https://dev.to/burgossrodrigo/extracting-the-sender-from-a-transaction-with-go-ethereum-1cn3 |
When working with Ethereum transactions in Go, extracting the sender (the address that initiated the transaction) is not straightforward. The go-ethereum library provides the necessary tools, but you need to follow a specific process to get the sender's address. This post will guide you through the steps required to extract the sender from a transaction using go-ethereum.
**Prerequisites**
Before we dive in, make sure you have the following:
1. Go installed on your machine.
2. The go-ethereum package installed. If not, you can install it using:
```
go get github.com/ethereum/go-ethereum
```
Step-by-Step Guide
1. Import Necessary Packages
Start by importing the necessary packages in your Go file:
```
package main
import (
"log"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethclient"
)
```
2. Get the Chain ID
The chain ID is essential for signing and verifying transactions. Here’s a helper function to get the chain ID:
```
func getChainId() (*big.Int, error) {
client, err := ethclient.Dial("https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID")
if err != nil {
return nil, err
}
chainID, err := client.NetworkID(context.Background())
if err != nil {
return nil, err
}
return chainID, nil
}
```
3. Extract the Sender
Here’s the core function to extract the sender from a transaction:
```
func getTxSender(tx *types.Transaction) (string, error) {
chainId, err := getChainId()
if err != nil {
log.Fatal("Failed to get chainId:", err)
return "", err
}
sender, err := types.Sender(types.NewLondonSigner(chainId), tx)
if err != nil {
log.Fatal("Not able to retrieve sender:", err)
return "", err
}
return sender.Hex(), nil
}
```
This function retrieves the chain ID, and then uses the types.Sender function with a NewLondonSigner to get the sender’s address. The NewLondonSigner is used to handle transactions post-EIP-1559 (the London hard fork).
4. Usage Example
```
func main() {
// Example transaction hash
txHash := "0x..."
// Connect to Ethereum client
client, err := ethclient.Dial("https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID")
if err != nil {
log.Fatal("Failed to connect to the Ethereum client:", err)
}
// Get the transaction
tx, _, err := client.TransactionByHash(context.Background(), common.HexToHash(txHash))
if err != nil {
log.Fatal("Failed to retrieve transaction:", err)
}
// Get the sender
sender, err := getTxSender(tx)
if err != nil {
log.Fatal("Failed to get transaction sender:", err)
}
log.Printf("Transaction was sent by: %s", sender)
}
```
**Conclusion**
Extracting the sender from a transaction in Go using go-ethereum involves retrieving the chain ID and using the appropriate signer. This method ensures compatibility with transactions after the London hard fork. With the provided code snippets, you should be able to implement this functionality in your Go applications easily.
Feel free to leave comments or ask questions if you encounter any issues. Happy coding!
| burgossrodrigo | |
1,884,952 | Understanding DML, DDL, DCL,TCL SQL Commands in MySQL | MySQL is a popular relational database management system used by developers worldwide. It uses... | 0 | 2024-06-11T22:39:21 | https://dev.to/ayas_tech_2b0560ee159e661/understanding-dml-ddl-dcltcl-sql-commands-in-mysql-o1f | MySQL is a popular relational database management system used by developers worldwide. It uses Structured Query Language (SQL) to interact with databases. SQL commands can be broadly categorized into Data Manipulation Language (DML), Data Definition Language (DDL), and several other types. In this blog post, we'll explore these categories and provide examples to help you understand their usage.
**Data Manipulation Language (DML)**
DML commands are used to manipulate data stored in database tables. These commands allow you to insert, update, delete, and retrieve data.
**1. INSERT**
The INSERT command is used to add new rows to a table.
Example
```
INSERT INTO employees (name, position, salary)
VALUES ('Alex Brad', 'Software Engineer', 75000);
```
**2. SELECT**
The SELECT command is used to retrieve data from a table.
Example
```
SELECT name, position FROM employees;
```
**3. UPDATE**
The UPDATE command is used to modify existing data in a table.
Example
```
UPDATE employees
SET salary = 80000
WHERE name = 'John De';
```
**4. DELETE**
The DELETE command is used to remove rows from a table.
Example
```
DELETE FROM employees
WHERE name = 'John De'; #it can be id, or other columns
```
**Data Definition Language (DDL)**
DDL commands are used to define and manage database schema. These commands allow you to create, modify, and delete database objects such as tables, indexes, and views.
**1. CREATE**
The CREATE command is used to create new database objects.
Example
```
CREATE TABLE employees (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(100) NOT NULL,
position VARCHAR(50),
salary DECIMAL(10, 2)
);
```
**2. ALTER**
The ALTER command is used to modify existing database objects.
Example
```
ALTER TABLE employees
ADD COLUMN hire_date DATE;
```
**3. DROP**
The DROP command is used to delete database objects.
Example
```
DROP TABLE employees;
```
**4. TRUNCATE**
The TRUNCATE command is used to delete all rows from a table, but the table structure remains.
Example
```
TRUNCATE TABLE employees;
```
**Data Control Language (DCL)**
DCL commands are used to control access to data in the database. These commands include GRANT and REVOKE.
**1. GRANT**
The GRANT command is used to give users access privileges to the database.
Example
```
GRANT SELECT, INSERT ON employees TO 'user'@'localhost';
```
**2. REVOKE**
The REVOKE command is used to remove access privileges from users.
Example
```
REVOKE SELECT, INSERT ON employees FROM 'user'@'localhost';
```
**Transaction Control Language (TCL)**
TCL commands are used to manage transactions in the database. These commands include COMMIT, ROLLBACK, and SAVEPOINT.
**1. COMMIT**
The COMMIT command is used to save all changes made in the current transaction.
Example
```
START TRANSACTION;
UPDATE employees SET salary = 85000 WHERE name = 'Jane Doe';
COMMIT;
```
**2. ROLLBACK**
The ROLLBACK command is used to undo changes made in the current transaction.
Example
```
START TRANSACTION;
UPDATE employees SET salary = 90000 WHERE name = 'Jane Doe';
ROLLBACK;
```
**3. SAVEPOINT**
The SAVEPOINT command is used to set a savepoint within a transaction, allowing partial rollbacks.
Example
```
START TRANSACTION;
UPDATE employees SET salary = 90000 WHERE name = 'Jane Doe';
SAVEPOINT sp1;
UPDATE employees SET salary = 95000 WHERE name = 'Jane Doe';
ROLLBACK TO sp1;
COMMIT;
```
**Conclusion**
Understanding the different types of SQL commands in MySQL is crucial for effective database management. DML commands allow you to manipulate data, DDL commands help define and manage the database schema, DCL commands control access to the data, and TCL commands manage transactions. By mastering these commands, you can perform a wide range of database operations efficiently and securely.
| ayas_tech_2b0560ee159e661 | |
1,884,896 | Understanding the Difference Between JavaScript and TypeScript | As a developer, you’ve likely heard about both JavaScript and TypeScript. While JavaScript is one of... | 0 | 2024-06-11T22:19:51 | https://dev.to/ayas_tech_2b0560ee159e661/understanding-the-difference-between-javascript-and-typescript-jm1 | As a developer, you’ve likely heard about both JavaScript and TypeScript. While JavaScript is one of the most popular programming languages for web development, TypeScript has been gaining traction due to its added features and benefits. In this blog post, I'll explore the key differences between JavaScript and TypeScript, and provide some code examples to illustrate these differences.
**What is JavaScript?**
JavaScript is a dynamic, high-level, interpreted programming language. It's widely used for web development, enabling interactive and dynamic content on websites. JavaScript is known for its flexibility, allowing developers to write code quickly without worrying about data types or strict syntax rules.
Example of JS code :
```
function greeting(name) {
return `Welcome to JavaScript, ${name}!`;
}
console.log(greeting("Tom")); // Output: Welcome to JavaScript, Tom
```
**What is TypeScript?**
TypeScript is a statically typed superset of JavaScript developed by Microsoft. It adds optional static typing, classes, and interfaces to JavaScript. TypeScript code is transpiled into JavaScript, which means it can run anywhere JavaScript runs, but with the benefits of type safety and advanced features.
```
function greeting(name: string): string {
return `Welcome to TypeScript, ${name}!`;
}
console.log(greet("Alice")); // Output: Welcome to TypeScript, Tom
// console.log(greet(123)); // Error: Argument of type 'number' is not assignable to parameter of type 'string'.
```
**Key Differences Between JavaScript and TypeScript**
**1. Static Typing**
One of the most significant differences between JavaScript and TypeScript is static typing. In JavaScript, variables can be of any type and can change types at runtime. TypeScript, on the other hand, requires you to define the type of each variable, providing type safety and reducing runtime errors.
JavaScript Example
```
let message = "Hello, World!";
message = 42; // No error
```
TypeScript Example
```
let message: string = "Hello, World!";
message = 42; // Error: Type 'number' is not assignable to type 'string'.
```
**2. Type Annotations**
TypeScript allows you to annotate your code with types, making it easier to understand and maintain. This feature helps catch errors early in the development process.
TypeScript Example
```
function add(a: number, b: number): number {
return a + b;
}
console.log(add(10, 5)); // Output: 15
// console.log(add("10", 5)); // Error: Argument of type 'string' is not assignable to parameter of type 'number'.
```
**3. Interfaces**
TypeScript introduces interfaces, which allow you to define the structure of an object. This helps ensure that objects meet certain requirements and improves code readability and maintainability.
TypeScript Example
```
interface Person {
name: string;
age: number;
}
function greeting(person: Person): string {
return `Hello, ${person.name}! You are ${person.age} years old.`;
}
const tom: Person = { name: "Tom", age: 25 };
console.log(greeting(tom)); // Output: Hello, Tom! You are 25 years old.
```
**4. Classes and Inheritance**
While JavaScript has basic support for classes and inheritance, TypeScript enhances these features with better syntax and type checking.
JavaScript Example
```
class Animal {
constructor(name) {
this.name = name;
}
speak() {
console.log(`${this.name} makes a noise.`);
}
}
class Dog extends Animal {
speak() {
console.log(`${this.name} barks.`);
}
}
const dog = new Dog("Rex");
dog.speak(); // Output: Rex barks.
```
TypeScript Example
```
class Animal {
name: string;
constructor(name: string) {
this.name = name;
}
speak(): void {
console.log(`${this.name} makes a noise.`);
}
}
class Dog extends Animal {
speak(): void {
console.log(`${this.name} barks.`);
}
}
const dog = new Dog("Rex");
dog.speak(); // Output: Rex barks.
```
**Conclusion**
JavaScript and TypeScript each have their own advantages. JavaScript is flexible and easy to use, making it ideal for quick development and prototyping. TypeScript, with its static typing and additional features, offers improved code quality and maintainability, especially for larger projects.
Choosing between JavaScript and TypeScript depends on your project requirements and personal preferences. If you prioritize flexibility and speed, JavaScript might be the right choice. However, if you value type safety and robust development tools, TypeScript could be more suitable.
Regardless of your choice, understanding the differences and benefits of each language will make you a more versatile and effective developer.
| ayas_tech_2b0560ee159e661 | |
1,884,884 | Creating mocked data for EF Core using Bogus and more | Introduction The main objective is to demonstrate creating data for Microsoft EF Core that... | 22,612 | 2024-06-11T22:17:12 | https://dev.to/karenpayneoregon/creating-mocked-data-for-ef-core-using-bogus-and-more-2l0i | dotnetcore, database, csharp | ## Introduction
The main objective is to demonstrate creating data for Microsoft EF Core that is the same every time the application runs and/or unit test run.
The secondary objective is to show how to use [IOptions](https://learn.microsoft.com/en-us/dotnet/core/extensions/options) and [AddTransient](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.servicecollectionserviceextensions.addtransient?view=net-8.0) to read information from appsettings.json which is not gone over completely so if interested see the following [GitHub repository](https://github.com/karenpayneoregon/razor-pages-IOptions-samples) which has code samples for console and web projects.
{% cta https://github.com/karenpayneoregon/csharp-11-ef-core-7-features/tree/master/BogusProperGenderEntityApp %} Sample project {% endcta %}
## Walkthrough
In the source code, the first steps are to read the database connection string and a setting to decide to create a fresh copy of the database from appsettings.json.
appsetting.json
```json
{
"ConnectionStrings": {
"MainConnection": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=Bogus2;Integrated Security=True;Encrypt=False",
"SecondaryConnection": "TODO"
},
"EntityConfiguration": {
"CreateNew": false
}
}
```
In Program.cs, the following code sets up to read appsettings.json data.
```csharp
private static async Task Setup()
{
var services = ApplicationConfiguration.ConfigureServices();
await using var serviceProvider = services.BuildServiceProvider();
serviceProvider.GetService<SetupServices>()!.GetConnectionStrings();
serviceProvider.GetService<SetupServices>()!.GetEntitySettings();
}
```
Both connection string and application settings use singleton classes to access information in various parts of the program.
```csharp
public sealed class DataConnections
{
private static readonly Lazy<DataConnections> Lazy = new(() => new DataConnections());
public static DataConnections Instance => Lazy.Value;
public string MainConnection { get; set; }
public string SecondaryConnection { get; set; }
}
public sealed class EntitySettings
{
private static readonly Lazy<EntitySettings> Lazy = new(() => new EntitySettings());
public static EntitySettings Instance => Lazy.Value;
/// <summary>
/// Indicates if the database should be recreated
/// </summary>
public bool CreateNew { get; set; }
}
```
Next, in Program.Main method
- Instantiate an instance of the DbContext
- _EntitySettings.Instance.CreateNew_ determines if the database should be created fresh.
```csharp
static async Task Main(string[] args)
{
await Setup();
await using var context = new Context();
if (EntitySettings.Instance.CreateNew)
{
await context.Database.EnsureDeletedAsync();
await context.Database.EnsureCreatedAsync();
}
. . .
}
```
Database details.
There is one table BirthDays which
- YearsOld column is a computed column
- BirthDate is a date column, C# side a DateOnly
- Gender is a string column, C# side an enum
```sql
CREATE TABLE [dbo].[BirthDays] (
[Id] INT IDENTITY (1, 1) NOT NULL,
[FirstName] NVARCHAR (MAX) NULL,
[LastName] NVARCHAR (MAX) NULL,
[Gender] NVARCHAR (MAX) NOT NULL,
[BirthDate] DATE NULL,
[YearsOld] AS ((CONVERT([int],format(getdate(),'yyyyMMdd'))-CONVERT([int],format([BirthDate],'yyyyMMdd')))/(10000)),
[Email] NVARCHAR (MAX) NULL,
CONSTRAINT [PK_BirthDays] PRIMARY KEY CLUSTERED ([Id] ASC)
);
```
**DbContext**
_OnConfiguring_ the connection is setup, read from _DataConnections _ class and _DbContextToFileLogger_ is setup and responsible for logging all EF Core operations to a daily log file beneath the application.
_OnModelCreating_ setup a conversion for Gender property and setup the computed column.
> **Note**
> The Gender enum is setup as the same as Gender in Bogus, more on this later.
Next, the final part determines if Bogus data should be used and will only happen when testing, not for production so be mindful to change the setting in appsetting.json before moving to production.
```csharp
public partial class Context : DbContext
{
public Context()
{
}
public Context(DbContextOptions<Context> options)
: base(options)
{
}
public virtual DbSet<BirthDays> BirthDays { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
/*
* Get connection string from appsetting.json
* Setup logging to a file under the app folder (see the project file for folder creation)
*/
optionsBuilder.UseSqlServer(DataConnections.Instance.MainConnection)
.EnableSensitiveDataLogging()
.LogTo(new DbContextToFileLogger().Log, new[]
{
DbLoggerCategory.Database.Command.Name
},
LogLevel.Information);
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<BirthDays>(entity =>
{
// setup enum conversion
entity.Property(e => e.Gender)
.HasConversion<int>()
.IsRequired();
// setup computed column
entity.Property(e => e.YearsOld)
.HasComputedColumnSql("((CONVERT([int],format(getdate(),'yyyyMMdd'))-CONVERT([int],format([BirthDate],'yyyyMMdd')))/(10000))", false);
});
if (EntitySettings.Instance.CreateNew)
{
modelBuilder.Entity<GenderData>().HasData(BogusOperations.GenderTypes());
modelBuilder.Entity<BirthDays>().HasData(new List<BirthDays>(BogusOperations.PeopleList(20,338)));
}
}
}
```
**BirthDays model**
There are two constructors, the overload which passes an int is for use when creating data with Bogus.
```csharp
public partial class BirthDays
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
/// <summary>
/// Person gender
/// </summary>
public Gender Gender { get; set; }
public DateOnly? BirthDate { get; set; }
// computered column, see DbContext OnModelCreating
public int? YearsOld { get; set; }
public string Email { get; set; }
// For Bogus to set Id property
public BirthDays(int id)
{
Id = id;
}
public BirthDays()
{
}
}
```
### Creating Bogus data
To create consistent data with Bogus, the Faker must be seeded using Randomizer.Seed = new Random(338) where 338 can be any number but in some cases the seed in tangent with count of instances of the (any) model may not align first names with the proper gender so play with the number if matching first names to the proper gender.
In the image below, the arrows mark the code which attempt to match first names with the proper gender.
Both methods produce the same results, its a matter of preference which to use.
**Third party NuGet packages uses**
| Package | Purpose |
|:------------- |:-------------|
| [Bogus](https://www.nuget.org/packages/Bogus/35.5.1?_src=template) | For creating mocked data |
| [ConfigurationLibrary](https://www.nuget.org/packages/ConfigurationLibrary/1.0.6?_src=template) | Provides access to appsettings.json for connection strings for three environments, development, testing/staging and production. |
| [EntityCodeFileLogger](https://www.nuget.org/packages/EntityCoreFileLogger/1.0.0?_src=template) | A simple class to log EF Core operations to a text file |
## EF Power Tools
[EF Power Tools](https://marketplace.visualstudio.com/items?itemName=ErikEJ.EFCorePowerTools) was used to reverse engineer the original database.
| karenpayneoregon |
1,884,895 | Unlocking the Power of Geolocation with IPStack's API | In today's hyper-connected world, understanding the geographical location of your users is paramount... | 0 | 2024-06-11T22:16:37 | https://dev.to/ipstackapi/unlocking-the-power-of-geolocation-with-ipstacks-api-30jb | geolocation, location | In today's hyper-connected world, understanding the geographical location of your users is paramount for personalized user experiences, targeted marketing campaigns, and enhanced security measures. Harnessing the power of geolocation data has become a necessity for businesses across various industries. This is where IPStack's API steps in, offering a robust solution for accurate IP-based geolocation services.
## What is IPStack?
IPStack is a leading provider of [IP geolocation API](https://ipstack.com/) services, offering developers and businesses a comprehensive API for accessing accurate location data based on IP addresses. With a vast database of IP address information and advanced algorithms, IPStack empowers organizations to leverage geolocation data effectively in their applications and systems.
## Key Features of IPStack's API:
1. Accurate Geolocation Data: IPStack's API provides precise information about the geographical location of an IP address, including the country, region, city, latitude, longitude, and even the time zone. This level of accuracy enables businesses to tailor their services based on the user's location.
2. Multi-language Support: The API supports multiple programming languages, including JavaScript, Python, PHP, and more, making it accessible and easy to integrate into a wide range of applications and platforms.
3. Security and Compliance: IPStack prioritizes data security and compliance with regulations such as GDPR. By ensuring the protection of sensitive user information, businesses can confidently utilize IPStack's services without compromising privacy or security.
4. Reliability and Scalability: With a highly reliable infrastructure and scalable architecture, IPStack's API can handle large volumes of requests without compromising performance. Whether you're a small startup or a multinational corporation, IPStack scales to meet your geolocation needs.
## How Businesses Benefit from IPStack's API:
1. Enhanced User Experience: By leveraging geolocation data, businesses can personalize their user experiences based on location. Whether it's displaying relevant content, offering location-based promotions, or optimizing website language and currency settings, IPStack enables businesses to create tailored experiences that resonate with their audience.
2. Targeted Marketing Campaigns: Understanding the geographical distribution of your users allows for targeted marketing campaigns that resonate with specific demographics and regions. Whether you're promoting a local event or expanding into new markets, IPStack's geolocation data provides valuable insights to drive marketing strategies.
3. Fraud Prevention and Security: Geolocation data can also be instrumental in detecting and preventing fraudulent activities such as account takeovers, identity theft, and unauthorized access. By analyzing the location of IP addresses, businesses can identify suspicious behavior and implement proactive security measures to safeguard their systems and users.
4. Geotargeted Content Delivery: Whether you're a content provider, e-commerce platform, or streaming service, delivering relevant content based on the user's location can significantly enhance engagement and satisfaction. IPStack's API enables businesses to geotarget content, ensuring that users receive localized information, products, and services.
## Conclusion:
In today's digital landscape, leveraging geolocation data is no longer optional—it's essential for businesses seeking to enhance user experiences, drive targeted marketing campaigns, and bolster security measures. With [IP location API](https://ipstack.com/documentation), accessing accurate and reliable geolocation data has never been easier. From personalized user experiences to targeted marketing campaigns and fraud prevention, IPStack empowers businesses to unlock the full potential of geolocation data and stay ahead in a competitive market. | ipstackapi |
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