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1,891,987 | Finding the Best DevOps Developers: A Comprehensive Guide for Hiring Managers | DevOps developers play a crucial role in the software development process, as they are responsible... | 0 | 2024-06-18T05:51:32 | https://dev.to/ritesh12/finding-the-best-devops-developers-a-comprehensive-guide-for-hiring-managers-47l3 | DevOps developers play a crucial role in the software development process, as they are responsible for bridging the gap between development and operations teams. They are tasked with automating and streamlining the deployment, monitoring, and management of applications, as well as ensuring the reliability and security of the infrastructure. DevOps developers also work to improve collaboration and communication between different teams, and to implement best practices for continuous integration and delivery. In essence, they are the architects of the software development lifecycle, and are instrumental in driving innovation and efficiency within an organization.
DevOps developers must possess a deep understanding of both software development and IT operations, as well as strong problem-solving and analytical skills. They should be proficient in various programming languages, as well as have a solid grasp of infrastructure automation tools and cloud platforms. Additionally, they should be able to work well under pressure, and have excellent communication and teamwork abilities. Overall, DevOps developers are essential in ensuring that software is developed, tested, and deployed in a timely and efficient manner, while maintaining high levels of quality and security.
Identifying the Skills and Qualities to Look for in DevOps Developers
When looking to hire a DevOps developer, it is important to identify the specific skills and qualities that are essential for success in this role. Firstly, candidates should have a strong background in software development, with proficiency in languages such as Python, Ruby, Java, or C++. They should also have experience with infrastructure automation tools such as Puppet, Chef, or Ansible, as well as knowledge of cloud platforms like AWS, Azure, or Google Cloud. Additionally, candidates should possess strong problem-solving abilities, and be able to think critically and analytically when faced with complex technical challenges.
In terms of qualities, DevOps developers should be highly adaptable and able to work in fast-paced environments. They should be proactive and self-motivated, with a strong sense of ownership and accountability for their work. Furthermore, they should be excellent communicators, able to collaborate effectively with cross-functional teams and stakeholders. Finally, they should have a passion for continuous learning and improvement, as the field of DevOps is constantly evolving with new technologies and best practices.
Crafting a Job Description and Posting it on Relevant Platforms
Crafting a comprehensive job description is crucial when looking to attract top talent for a DevOps developer role. The job description should clearly outline the responsibilities and requirements of the position, as well as provide insight into the company culture and values. It should also highlight the opportunities for growth and development within the organization, in order to entice potential candidates.
Once the job description has been crafted, it should be posted on relevant platforms where DevOps developers are likely to be searching for opportunities. This could include job boards such as Indeed or Glassdoor, as well as industry-specific platforms like Stack Overflow or GitHub. Additionally, leveraging social media channels such as LinkedIn or Twitter can help to reach a wider audience of potential candidates. It is important to ensure that the job posting is optimized for search engines, using relevant keywords and phrases that are likely to be used by job seekers.
Conducting a Thorough Screening and Interview Process
When it comes to hiring a DevOps developer, conducting a thorough screening and interview process is essential in order to identify the best fit for the role. This process should begin with an initial screening of resumes and cover letters, in order to narrow down the pool of candidates to those who meet the basic qualifications for the position. From there, phone or video interviews can be conducted to further assess candidates' technical skills and experience, as well as their fit within the company culture.
Following the initial screening process, in-person interviews can be conducted to delve deeper into candidates' technical abilities and problem-solving skills. This could involve technical assessments or coding challenges, in order to gauge candidates' proficiency in programming languages and infrastructure automation tools. Additionally, behavioral interviews can be used to assess candidates' communication skills, teamwork abilities, and overall cultural fit within the organization.
Assessing Technical Skills and Experience
Assessing candidates' technical skills and experience is a critical component of the hiring process for a DevOps developer role. This can be done through a variety of methods, including technical assessments, coding challenges, and practical exercises. These assessments should test candidates' proficiency in programming languages such as Python, Ruby, or Java, as well as their knowledge of infrastructure automation tools like Puppet, Chef, or Ansible.
In addition to technical assessments, it is important to evaluate candidates' experience with cloud platforms such as AWS, Azure, or Google Cloud. Candidates should be able to demonstrate their ability to deploy and manage applications in a cloud environment, as well as their understanding of best practices for security and scalability. Overall, assessing candidates' technical skills and experience is crucial in identifying those who have the expertise necessary to excel in a DevOps developer role.
Evaluating Cultural Fit and Team Dynamics
In addition to technical skills and experience, evaluating candidates' cultural fit and team dynamics is essential when hiring a DevOps developer. This involves assessing candidates' communication skills, teamwork abilities, and overall alignment with the company culture and values. Candidates should be able to demonstrate their ability to collaborate effectively with cross-functional teams and stakeholders, as well as their willingness to contribute to a positive and inclusive work environment.
Furthermore, evaluating team dynamics involves assessing candidates' ability to work well under pressure and adapt to changing priorities. DevOps developers often work in fast-paced environments with tight deadlines, so it is important to identify those who are able to thrive in such conditions. Overall, evaluating cultural fit and team dynamics is crucial in ensuring that the chosen candidate will be able to integrate seamlessly into the existing team and contribute positively to the overall success of the organization.
Making the Final Decision and Onboarding the Best DevOps Developer
After conducting a thorough screening and interview process, it is time to make the final decision and onboard the best DevOps developer for the role. This decision should be based on a combination of factors including technical skills, experience, cultural fit, and team dynamics. It is important to consider not only the candidate's ability to excel in the role immediately but also their potential for growth and development within the organization.
Once the final decision has been made, it is crucial to ensure a smooth onboarding process for the new DevOps developer. This could involve providing comprehensive training on company processes and tools, as well as introducing them to key stakeholders within the organization. Additionally, setting clear expectations for performance and providing ongoing support and feedback will help to ensure that the new hire is able to hit the ground running and make a positive impact from day one.
In conclusion, hiring a DevOps developer requires careful consideration of technical skills, experience, cultural fit, and team dynamics. By crafting a comprehensive job description, posting it on relevant platforms, conducting a thorough screening and interview process, assessing technical skills and experience, evaluating cultural fit and team dynamics, making the final decision, and onboarding the best candidate, organizations can ensure that they are able to attract top talent for this critical role. Ultimately, hiring the right DevOps developer can have a significant impact on an organization's ability to innovate and drive efficiency within their software development lifecycle.
https://nimapinfotech.com/hire-devops/ | ritesh12 | |
1,891,986 | cTop Python Libraries for Data Science in 2024 | Top Python Libraries for Data Science in... | 0 | 2024-06-18T05:49:40 | https://dev.to/sh20raj/ctop-python-libraries-for-data-science-in-2024-2a3f | python, datascience | ## Top Python Libraries for Data Science in 2024
> https://www.reddit.com/r/DevArt/comments/1dijfiv/top_python_libraries_for_data_science_in_2024/
The landscape of data science is ever-evolving, and staying updated with the latest tools is crucial for any data scientist. Python continues to be the dominant language in the field, thanks to its robust ecosystem of libraries that streamline data analysis, machine learning, and deep learning tasks. Here's a look at the top Python libraries for data science in 2024.
### 1. **Pandas**
Pandas remains a cornerstone for data manipulation and analysis. Its DataFrame object allows for efficient handling of large datasets, and recent updates have improved performance and usability. In 2024, Pandas continues to be indispensable for tasks such as data cleaning, transformation, and analysis.
- **Key Features**:
- Data manipulation using DataFrame and Series objects.
- Powerful group by operations and aggregations.
- Integration with other data science libraries like Matplotlib and Seaborn.
### 2. **NumPy**
NumPy is the foundation of scientific computing in Python. It provides support for large multi-dimensional arrays and matrices, along with a collection of mathematical functions to operate on these arrays.
- **Key Features**:
- Efficient array computations and broadcasting.
- Linear algebra, Fourier transform, and random number capabilities.
- Interoperability with other libraries like Pandas, SciPy, and Scikit-learn.
### 3. **Scikit-Learn**
Scikit-Learn is the go-to library for machine learning in Python. It offers simple and efficient tools for data mining and data analysis, making it accessible for both beginners and experienced practitioners.
- **Key Features**:
- Comprehensive suite of supervised and unsupervised learning algorithms.
- Tools for model selection, validation, and evaluation.
- Pipelines for automating machine learning workflows.
### 4. **TensorFlow and Keras**
TensorFlow, with its high-level API Keras, continues to lead in deep learning. TensorFlow 2.x has made significant strides in simplifying model development and deployment.
- **Key Features**:
- Easy model building with Keras' sequential and functional APIs.
- Scalable distributed training and deployment.
- Support for TensorFlow Lite, TensorFlow.js, and TensorFlow Extended (TFX).
### 5. **PyTorch**
PyTorch has gained immense popularity for its dynamic computational graph and ease of use, making it a favorite among researchers and practitioners.
- **Key Features**:
- Dynamic computation graph for flexibility and intuitive debugging.
- Strong community support and extensive documentation.
- Integration with other tools like ONNX for exporting models to different frameworks.
### 6. **Matplotlib and Seaborn**
Matplotlib and Seaborn are essential for data visualization in Python. While Matplotlib provides extensive plotting capabilities, Seaborn simplifies statistical plotting with a high-level interface.
- **Key Features** (Matplotlib):
- Wide range of static, animated, and interactive plots.
- Customizable figures and subplots.
- Extensive documentation and examples.
- **Key Features** (Seaborn):
- Simplified interface for creating complex visualizations.
- Built-in themes and color palettes for attractive plots.
- Integration with Pandas DataFrames for easy data visualization.
### 7. **XGBoost**
XGBoost is a powerful gradient boosting framework that has consistently shown superior performance in machine learning competitions and practical applications.
- **Key Features**:
- High performance and scalability.
- Regularization to prevent overfitting.
- Support for parallel and distributed computing.
### 8. **Hugging Face Transformers**
Hugging Face's Transformers library has revolutionized natural language processing (NLP) by providing pre-trained models that can be easily fine-tuned for various NLP tasks.
- **Key Features**:
- Pre-trained models for a wide range of NLP tasks like text classification, translation, and question answering.
- Easy-to-use APIs for model training and inference.
- Large and active community contributing to continuous improvements.
### 9. **Dask**
Dask is designed for parallel computing and is particularly useful for handling large datasets that do not fit into memory.
- **Key Features**:
- Scales Python code from a laptop to a cluster.
- Parallelizes NumPy, Pandas, and Scikit-learn operations.
- Integrates with distributed computing frameworks like Kubernetes.
### 10. **Plotly**
Plotly is an interactive graphing library that makes it easy to create interactive and publication-quality graphs.
- **Key Features**:
- Interactive plots that can be embedded in web applications.
- Support for a wide range of chart types including 3D plots.
- Integration with Jupyter notebooks and Dash for creating analytical web applications.
### Conclusion
The Python ecosystem for data science is rich and continually evolving. Staying up-to-date with these top libraries will ensure that you are equipped with the best tools to tackle any data science challenge in 2024. Whether you are manipulating data with Pandas, building machine learning models with Scikit-Learn, or diving into deep learning with TensorFlow or PyTorch, these libraries will provide the functionality and performance you need.
These libraries, backed by vibrant communities and extensive documentation, are essential for any data scientist looking to stay at the forefront of the field. | sh20raj |
1,891,985 | my name is Alok........................................................................... | A post by Alok Roy | 0 | 2024-06-18T05:47:23 | https://dev.to/alok_roy_e845c7114c4f550c/my-name-is-alok-390 | alok_roy_e845c7114c4f550c | ||
1,891,984 | Unraveling Big Mumbai: Your Gateway to Exciting Online Adventures | Welcome to Big Mumbai, where the world of online entertainment comes alive! In this article, we'll... | 0 | 2024-06-18T05:46:37 | https://dev.to/rutyjgh/unraveling-big-mumbai-your-gateway-to-exciting-online-adventures-3khd | Welcome to Big Mumbai, where the world of online entertainment comes alive! In this article, we'll explore the vibrant offerings of Big Mumbai, including its games, features, and the thrill it brings to players of all ages.
Big Mumbai: An Overview of Thrills
Big Mumbai is not just a platform; it's an experience. Dive into a world filled with thrilling games, exciting challenges, and endless opportunities to win big. From classic favorites to innovative new releases, Big Mumbai has something for everyone.
The Games Galore on Big Mumbai
Explore a diverse range of games on [Big Mumbai](https://bigmumbainew.bio.link/), including color prediction games, strategy games, and more. Each game is designed to offer a unique and engaging experience, keeping you entertained for hours on end.
Winning Strategies for Success
Discover expert strategies to enhance your chances of winning on Big Mumbai. Whether you're a seasoned player or new to online gaming, our tips and tricks will help you navigate the games with confidence and skill.
Community and Connectivity
Join a vibrant community of players on Big Mumbai and connect with like-minded individuals from around the world. Engage in friendly competition, share gaming experiences, and participate in exciting events that bring the community together.
User-Friendly Interface for Seamless Gaming
Experience a user-friendly interface on Big Mumbai that makes gaming easy and enjoyable. Navigate effortlessly between games, track your progress, and access helpful resources to enhance your gaming experience.
Security and Trust on Big Mumbai
Rest assured knowing that your privacy and security are our top priorities on Big Mumbai. We employ robust security measures to protect your data and ensure a safe and secure gaming environment for all players.
Conclusion:
Big Mumbai is more than just an online platform; it's a destination for adventure, excitement, and endless possibilities. Whether you're looking for thrilling games, expert strategies, a vibrant community, user-friendly interfaces, or top-notch security, Big Mumbai has it all. Join us today and embark on an unforgettable gaming journey!
Questions and Answers:
What sets Big Mumbai apart from other online gaming platforms?
Big Mumbai stands out with its diverse range of games, expert strategies, vibrant community, user-friendly interface, and strong focus on security, offering a comprehensive and enjoyable gaming experience.
How can players improve their gaming skills on Big Mumbai?
Players can enhance their gaming skills on Big Mumbai by exploring different games, learning from expert strategies, engaging with the community for tips and advice, and practicing regularly to refine their techniques. | rutyjgh | |
1,891,982 | Something Crazy about localhost: Unveiling the Inner Workings | Ever wonder when you type localhost into your browser, you might take for granted that it magically... | 0 | 2024-06-18T05:36:20 | https://dev.to/nayanraj-adhikary/something-crazy-about-localhost-unveiling-the-inner-workings-26nn | webdev, programming, python | Ever wonder when you type `localhost` into your browser, you might take for granted that it magically knows to connect your local computer. However, there's a fascinating mechanism behind how `localhost` works.
There were a bunch of questions I had in my mind.
1. How does it map to an IP address?
2. Does it function similarly to DNS?
## Let's dive into the details of localhost
**Localhost** is a hostname that refers to the current device used to access it. The name resolves to the IP address by default as `127.0.0.1` for IPv4 and `::1` for IPv6, pointing to the loopback network interface.
Wait what's a loopback Network Interface?
The loopback interface is a kind of special network interface used by the local computer to send network traffic to itself. Imagine it's like a virtual network device that software on your computer uses to test network applications without needing access to a physical network
- IPv4 -> `127.0.0.1`
- IPv6 -> `::1`
That's great, So how does the loopback interface know this information ?
## Mapping of Localhost to IP
The Mapping varies based on the operating system.
- Mac / Linux System -> `/etc/hosts`
- Windows: `C:\Windows\System32\drivers\etc\hosts`
Now you can play around with this hosts file and see how it's mapping magically.
## Does Localhost Work Like DNS?
While both localhost and DNS (Domain Name System) serve the purpose of resolving hostnames to IP addresses, they operate quite differently.
Hosts File: The resolution of localhost is handled locally through the hosts file. When you access localhost, the operating system reads the hosts file and maps localhost to 127.0.0.1 or ::1.
DNS: DNS is a hierarchical and decentralized naming system used for resolving domain names to IP addresses on the Internet. When you type a domain name (e.g., example.com) into your browser, the DNS resolver contacts multiple DNS servers to find the corresponding IP address.
## Playing around with localhost using Python
```python
import socket
print(socket.getaddrinfo('localhost', 0))
```
output:
```
[(<AddressFamily.AF_INET6: 30>, <SocketKind.SOCK_DGRAM: 2>, 17, '', ('::1', 0, 0, 0)), (<AddressFamily.AF_INET6: 30>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('::1', 0, 0, 0)), (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_DGRAM: 2>, 17, '', ('127.0.0.1', 0)), (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 0))]
```
Noticed the localhost carries both IPv4 and IPv6. So by using the IP address directly would be more efficient which would reduce the lookup. Interesting.
## Conclusion
The simplicity and reliability of localhost mask the sophisticated mechanisms working behind the scenes. By mapping to 127.0.0.1 or ::1 through the hosts file, localhost provides an essential tool for developers and system administrators.
## What did we learn
1. IP address directly would be more efficient which would reduce the lookup
2. IP addresses are just present within a hosts file.
3. DNS and local mapping of IP's are different
Thanks for reading my first blog about something we use daily. | nayanraj-adhikary |
1,891,980 | Who Are the Leading Blockchain Game Development Companies? | The gaming industry has always been at the forefront of technological innovation. Today, blockchain... | 0 | 2024-06-18T05:34:55 | https://dev.to/annakodi12/who-are-the-leading-blockchain-game-development-companies-39ii | The gaming industry has always been at the forefront of technological innovation. Today, blockchain technology is poised to revolutionize game development, gameplay and monetization. We explore ten key points about blockchain game development and how it will change the world of gaming.
**True ownership of in-game resources
**In traditional games, players can spend hundreds of hours and dollars to purchase in-game resources such as weapons, skins, and characters. However, these tools are the property of the game developers. Blockchain technology changes this by providing real ownership. Assets are held on the blockchain as Non-Fungible Tokens (NFTs), meaning players own these items and can trade or sell them outside of the game environment.
**Enhanced Data Security
**Blockchain's decentralized nature increases security. Traditional games are vulnerable to hacking and fraud, but blockchain technology makes it incredibly difficult for malicious actors to alter game data or steal assets. Every transaction is verified and recorded on a public ledger, ensuring transparency and reducing the risk of fraud and fraud.
**Interoperability
**Blockchain technology enables interoperability between different games and platforms. This means players can transfer their assets from game to game or use them in multiple games. For example, a sword obtained in one game can be used in another if both games support the same blockchain standards.
**Decentralized Marketplaces
**Blockchain allows in-game assets to be bought, sold, and traded on decentralized marketplaces. Players can monetize their in-game experience by selling rare items or characters to other players. These transactions are facilitated by smart contracts that ensure fair and transparent transactions without intermediaries.
**Game-win models
**Blockchain games often use game-win models where players can earn cryptocurrencies or NFTs by playing the game. It allows players to win real money while enjoying their favorite games. This model not only attracts more players, but also encourages longer engagement and loyalty.
**Transparency and fair play
**Blockchain technology ensures transparency in all events and game mechanics. Since all data is stored in a public ledger, it is impossible for developers to manipulate the game and for players to cheat. This creates trust among the gaming community because everyone knows that the rules are fair and consistent for all players.
**Innovative Game Mechanics
**Blockchain allows developers to create innovative game mechanics that were not possible before. For example, games can now have decentralized management where players vote on game updates or new features. This level of community involvement can lead to more engaging and player-centric game development.
**Funding and incentives for developers
**Blockchain opens up new ways to finance game development. Developers can raise funds through initial coin offerings (ICOs) or by selling in-game resources such as NFTs before the game is fully developed. This provides new revenue and allows developers to gather early support and feedback from the community.
**Sustainable Game Economy
**Traditional game economies often suffer from inflation and imbalance. Blockchain can create a more sustainable game economy through Tokenomics, where the supply and demand of in-game assets are managed through smart contracts. This ensures that the game's economy remains balanced and assets maintain their value over time.
**Future Possibilities and Innovations
**The integration of blockchain technology in gaming is still in its infancy, but the potential is huge. As technology evolves, we can expect even more innovative apps and gaming experiences. Virtual Reality (VR) and Augmented Reality (AR) combined with blockchain can create fully immersive and interactive game worlds that push the boundaries of possibility.
**Conclusion
**Blockchain technology is poised to transform the gaming industry by providing true ownership of in-game resources, improving security, enabling interoperability, and promoting new economic models. As developers and players continue to explore its potential, we can look forward to a new era of gaming that is more open, fair and rewarding.
Visit-- https://blocksentinels.com/blockchain-game-development-company
Reach our experts:
Phone +91 8148147362
Email sales@blocksentinels.com
 | annakodi12 | |
1,891,675 | Drawing 3D lines in Mapbox with the threebox plugin | Recently, I encountered a use case where I needed to draw a line in 3D space over a map layout. This... | 0 | 2024-06-18T05:33:22 | https://dev.to/miqwit/drawing-3d-lines-in-mapbox-with-the-threebox-plugin-5b0 | Recently, I encountered a use case where I needed to draw a line in 3D space over a map layout. This line represents the track of a local flight, which is far more engaging to view and explore in 3D than in 2D, as it allows for a better appreciation of the elevation changes.
I used [Mapbox](https://www.mapbox.com/) for my online map, given its popularity and its use in the Strava application, which I frequently use.
Mapbox offers a convenient method for displaying GeoJSON data files on a map, as detailed in this [Mapbox documentation page](https://docs.mapbox.com/mapbox-gl-js/example/geojson-line/).
## Setting up the scene with Mapbox
I work within a PHP Symfony application and use the NPM package manager. To integrate Mapbox, I installed the [mapbox-gl](https://www.npmjs.com/package/mapbox-gl) library using the command `npm i mapbox-gl`.
I also **created a Mapbox account and token** ([help page here](https://docs.mapbox.com/help/getting-started/access-tokens/), [token page here](https://docs.mapbox.com/help/getting-started/access-tokens/)) to use in my code.
Here is how the basic map creation looks in my project:
```javascript
var mapboxgl = require('mapbox-gl/dist/mapbox-gl.js');
mapboxgl.accessToken = 'pk....' // your full token here
var map = new mapboxgl.Map({
container: 'map', // the HTML element where the maps load
style: 'mapbox://styles/mapbox/outdoors-v12', // the Mapbox style of the map
center: [6.1229882, 43.24953278], // starting position [lng, lat]
zoom: 9,
});
```
For a more detailed setup of your first map in your project, you can refer to this page: [Display a map on a web page](https://docs.mapbox.com/mapbox-gl-js/example/simple-map/).
## Adding 3D terrain
Since I want to enjoy my map in 3D, adding terrain visualization is essential. This feature is not enabled by default. In Mapbox terminology, this involves using a `raster-dem` layer. You can find an example of this setup [here](https://docs.mapbox.com/mapbox-gl-js/example/add-terrain/).
In my context, the code looks like this:
```javascript
const exaggeration=1.5;
// Add terrain source
map.addSource('mapbox-dem', {
'type': 'raster-dem',
'url': 'mapbox://mapbox.mapbox-terrain-dem-v1',
'tileSize': 512,
'maxzoom': 14
});
// add the DEM source as a terrain layer with exaggerated height
map.setTerrain({ 'source': 'mapbox-dem', 'exaggeration': exaggeration });
```
As you can see, it's very close to the sample. Now, when I ctrl+click and move my mouse, I can see the elevation. The `exaggeration` constant helps to dramatize the terrain a bit, allowing for better appreciation of the relief.
## Adding my GeoJSON track to the map
As I mentioned earlier, Mapbox provides a convenient way to add GeoJSON data to my map, which is [documented here](https://docs.mapbox.com/mapbox-gl-js/example/simple-map/). In my case, the GeoJSON data is derived from processing a GPX file on the backend. I have my GeoJSON file stored on disk.
Here is how I load and display the GeoJSON data on the map:
```javascript
map.on("load", () => {
map.addSource("air-track", {
type: "geojson",
data: geojson, // geojson contains the path to my local geojson file
});
map.addLayer({
id: "air-track-line",
type: "line",
source: "air-track",
paint: {
"line-color": "#dd0000", // red
"line-width": 4,
},
});
}
```
This is enough to display something like this:
## Make this line 3D
Here we are pushing beyond the capabilities of Mapbox. Unfortunately, Mapbox's 3D capabilities with GeoJSON have limitations. It's important to note that my GeoJSON data includes elevation information, as per standard. Here is a sample of my data:
```json
"geometry": {
"type": "MultiLineString",
"coordinates": [
[
[
6.12827066, // lat
43.24983118, // lng
76.7122, // elevation
"2024-02-29T09:10:14Z" // time (not used)
],
[
6.12817452,
43.24956302,
81.7742,
"2024-02-29T09:10:20Z"
],
[
6.12814958,
43.24928749,
80.3541,
"2024-02-29T09:10:29Z"
],
...
```
In various discussions and [Stack Overflow issues](https://stackoverflow.com/questions/47283304/mapbox-extruding-lines), some workarounds have been suggested, but they don't fully meet my requirements.
The flexibility I need can be achieved by importing a Mapbox plugin called [threebox](https://github.com/peterqliu/threebox), which is a combination of [three.js](https://threejs.org/) and Mapbox.
## Adding threebox to the equation
I [installed Threebox](https://www.npmjs.com/package/threebox-plugin) and connected it to my map:
```javascript
// Creating tb related to my Mapbox map
const tb = (window.tb = new Threebox(
map, // my mapbox map
map.getCanvas().getContext('webgl'),
{
defaultLights: true
}
));
// On load, add a custom layer
map.on("load", () => {
...
map.addLayer({
id: 'custom_layer',
type: 'custom',
render: function(gl, matrix){
tb.update();
}
})
})
```
This is how it works: a new _custom layer_ is added to the scene, allowing us to draw specific shapes in the 3D space of Mapbox. The Threebox plugin is featured in this [Mapbox documentation page](https://docs.mapbox.com/mapbox-gl-js/example/add-3d-model-threebox/).
Initially, I was hesitant to delve into more complex tools, but after overcoming some integration challenges, using it turned out to be quite straightforward.
## Drawing in 3D
To add a line to the scene, you can use the convenient [`tb.line()`](https://github.com/peterqliu/threebox/blob/master/docs/Threebox.md) function. It supports the elevation parameter out of the box.
```javascript
const line_segment = tb.line({
geometry: [
[lat1, lng1, elevation1],
[lat2, lng2, elevation2],
],
color: '#dd0000',
width: 4,
opacity: 1
});
tb.add(line_segment);
```
This would create a line and add it to the scene.
## Drawing the GeoJSON data
To connect Threebox with the data needed to draw, the challenge lies in retrieving GeoJSON features from the scene. While Mapbox provides a `querySourceFeatures` method to fetch features from a source, I didn't manage to use it properly. My array of the features was empty, no matter what. I opted for a disk load, as my data is on a file accessible from this script.
```javascript
map.on('sourcedata', (e) => {
if (e.sourceId !== "air-track" && !e.isSourceLoaded) {
return;
}
const data = fetch(geojson).then(function(res) {
const jres = res.json().then(function(res) {
const coords = res.features[0].geometry.coordinates[0];
draw3dLine(coords);
});
});
})
```
I am listening for the `sourcedata` event. If the event's sourceId matches `air-track` (which is the source ID I used in `map.addSource()` above), I then load the GeoJSON data from the file and store the coordinates. Here's an approach to achieve this:
```javascript
function draw3dLine(coords) {
let i;
for (i = 0; i < coords.length; i++) {
if (i === 0) continue;
// Draw the segment in space
const line_segment = tb.line({
geometry: [
[coords[i][0], coords[i][1], coords[i][2] * exaggeration],
[coords[i - 1][0], coords[i - 1][1], coords[i - 1][2] * exaggeration],
],
color: '#dd0000',
width: 4,
opacity: 1
});
tb.add(line_segment);
}
}
```
Note that I reused the `exaggeration` constant here as I exaggerated the relief. Without it, the proportions would not be respected and the line could cross the terrain.
The core logic is implemented in that function. For each pair of coordinates in the source, it draws a line in space, resulting in something like this:
I found it a bit difficult to appreciate the track, so I added a vertical line after each 3D segment. Each of these lines has coordinates identical to the last segment point, set at elevation zero (lat, lng).
```
// Draw the vertical line at the end of the segment
const line_vertical = tb.line({
geometry: [
[coords[i - 1][0], coords[i - 1][1], coords[i - 1][2] * exaggeration],
[coords[i - 1][0], coords[i - 1][1], coords[i - 1][0]]
],
color: '#dd0000',
width: 1,
opacity: .5
})
tb.add(line_vertical);
```
Which draws as:
# Displaying a shadow
I retained the GeoJSON track feature provided by Mapbox to maintain the visible line on the ground. I simply reduced its width to 1 and changed the color to dark gray, creating the impression of a shadow.
```
map.addSource("air-track", {
type: "geojson",
data: geojson,
});
map.addLayer({
id: "air-track-line",
type: "line",
source: "air-track",
paint: {
"line-color": "#111111", // dark gray
"line-width": 1, // thin width
},
});
```
## Conclusion
It took me more time to find the right tools to solve my problem than to actually code the algorithm itself. In the context of my Symfony project, it also took some time to integrate GeoJSON, Mapbox, and threebox altogether.
I'm very enthusiastic about the result, and I'm sharing it here because there wasn't an obvious way to do so on the web. | miqwit | |
1,891,979 | Turning Your Love of Learning into a Career : Mastering Education Program Admissions | Education is a dynamic and creative field that allows you to explore innovative teaching approaches,... | 0 | 2024-06-18T05:32:13 | https://dev.to/sumit_2f7b895defa191cff9b/turning-your-love-of-learning-into-a-career-mastering-education-program-admissions-1g05 | Education is a dynamic and creative field that allows you to explore innovative teaching approaches, incorporate technology, and foster critical thinking skills in your students. You'll have the freedom to craft engaging lessons and activities that ignite curiosity and fuel a love for learning. The field of education is constantly evolving, offering lifelong opportunities for professional growth and development. As an educator, you'll have access to ongoing training, workshops, and advanced degree programs to enhance your skills and stay current with the latest teaching methodologies.
Are you someone who loves working with children and helping them learn and grow? If so, a career in education could be the perfect path for you. By pursuing an education degree from SGT University, the best education college in Haryana, you'll gain the knowledge and skills to become an outstanding teacher who can make a positive impact on countless young lives.
What do education courses include?
Education courses cover various topics, including the field of teaching and learning. Here are some common areas included in education degree programs:
Foundations of Education: This includes the history, philosophy, sociology, and psychology of education, as well as educational policies and laws.
Curriculum and Instruction: These courses focus on curriculum development, instructional strategies, lesson planning, and assessment methods for different subject areas and grade levels.
Educational Psychology: This involves studying human development, learning theories, motivation, classroom management, and strategies for addressing diverse learning needs.
Teaching Methods: Courses in this area cover specific teaching methods and techniques for various subjects, such as reading, mathematics, science, social studies, and language arts.
Classroom Management: These courses address strategies for creating an effective learning environment, managing student behavior, and promoting positive classroom dynamics.
Educational Technology: This includes the integration of technology in education, such as using computers, multimedia, and online resources for instruction and assessment.
Special Education: Courses in this area focus on teaching students with disabilities, learning disabilities, and other special needs, as well as inclusive education practices.
Diversity and Multicultural Education: These courses address cultural diversity, equity, and inclusivity in education, as well as strategies for teaching in diverse classrooms.
Student Assessment: This involves studying various assessment methods, data analysis, and using assessment data to inform instruction and support student learning.
Field Experience and Student Teaching: Most education programs include practical experiences, such as classroom observations, microteaching, and student teaching internships, where students can apply their knowledge in real classroom settings.
The specific courses and their depth may vary depending on the education discipline and the university's curriculum. However, the general structure aims to provide a solid foundation in the field of education and learning, along with specialized knowledge and practical experience in the chosen field of study.
Why is SGT University the best education college in Gurgaon?
The best M.Ed. and Ph. D. in education college in Gurgaon, SGT University Faculty of Education, offers a M.Ed. and Ph. D. course program. The UGC recognized SGT University, which was founded in 2013 with the main goals of advancing research, innovation, and multidisciplinary education. SGT University is recognized by the National Assessment and Accreditation Council (NAAC) with an A+ ranking, which spans more than 70 acres. Its vision is to encourage brilliant individuals through value-based, cross-cultural, integrated, and holistic education that employs modern and advanced techniques combined with ethical ideals to contribute to the development of a peaceful and sustainable global civilization. It is considered one of the best M.Ed. and Ph.D. in education colleges in Delhi, NCR.
Admission Procedure
The admissions process for education courses varies college-wise. But the admission process at Sgt. University, the best M.Ed. college in Gurgaon, is very simple. All you need to do is first go to the official website of SGT University, the best Ph.D. in education college in Haryana. Then fill out the application form, and there will be a personal interview through assessment, during which your seat will be reserved and you will be ready to proceed in your career.
List of Masters in Education Courses
The list of courses provided in the Masters in Education program by SGT University, the best M.Ed. college in Gurgaon,
Master of Education
Master of Education (Special Education - Hearing Impairment)
About M. Ed. courses
Master of Education
A Postgraduate degree that prepares individuals for various roles and responsibilities within the field of education
M. Ed. Course Admission Eligibility
To be eligible for admission in the M.Ed. course, a candidate must have B. Ed. / BA B.Ed. / Bachelor of Science B. Ed. / B.EI.Ed., / D.EI.Ed. (with undergraduate degree) with 55% marks.
M. Ed. course Fee Structure
The total fee (per annum) for pursuing the M.Ed. course program is INR 1,00,000 at SGT University, the best M.Ed. college in Delhi, NCR. It also provides a scholarship based on your exam scores.
Curriculum of M.Ed.
The curriculum typically covers advanced coursework in areas like educational theory, research methods, instructional design, assessment and specialized electives based on the chosen concentration.
Syllabus Covered in the Course:
SEMESTER 1:
Psychology of Learning & Development
Introduction to Research Methodology
Educational Technology
Educational Studies
Self Development
Communication Skills & Expository Writing
SEMESTER 2:
Philosophical & Sociological Foundations of Education
Advanced Educational Research
Measurement and Evaluation
Teacher Education
Historical Development of Education
Practical in Educational Psychology
Development of e-content
SEMESTER 3:
Pre-Internship Practical
Internship in School Practical
Internship in Teacher Education Institution
SEMESTER 4:
Curriculum Studies
Educational Management, Administration and Leadership
Guidance and Counseling
Inclusive Education
Professional Development of Teachers
Dissertation Practical
Career after M.Ed.
After completing a M.Ed. , students are prepare for various roles including: Teacher leadership or curriculum specialist roles in K - 12 schools., Instructional coordinator or curriculum developer positions, Roles in education administration such as principal or assistant principal, Post secondary teaching positions at community colleges or universities, specialized roles in areas like educational technology, special education or counselling.
Master of Education (Special Education - Hearing Impairment)
The M.Ed. (Special Education - Hearing Impairment) is a specialized program designed to equip individuals with the knowledge and skills required to work with students who have hearing impairments or deafness.
M. Ed. (Special Education - Hearing Impairment) Course Admission Eligibility
To be eligible for admission in the M.Ed. (Special Education - Hearing Impairment) course, a candidate must have B. Ed. / BA B.Ed. / Bachelor of Science B. Ed. / B.EI.Ed., / D.EI.Ed. (with an undergraduate degree) with 55% marks.
M. Ed. (Special Education - Hearing Impairment) course Fee Structure
The total fee (per annum) for pursuing the M.Ed. . (Special Education - Hearing Impairment) course program is INR 1,00,000 at SGT University, the best M.Ed. (Special Education - Hearing Impairment) college in Delhi, NCR. It also provides a scholarship based on your exam scores.
Curriculum of D.Ed. (Special Education - Hearing Impairment)
TThe M.Ed. (Special Education - Hearing Impairment) curriculum covers a wide range of topics related to hearing impairment, such as audiology, speech and language development, educational assessment, instructional strategies, classroom management communication strategies, assistive technologies, and educational interventions.
Career after M.Ed. (Special Education - Hearing Impairment)
After completing a M.Ed. (Special Education - Hearing Impairment), students are prepared to work as special education teachers, teachers of the deaf or hard of hearing, educational audiologists, speech - language pathologists or consultants in public or private schools, early intervention programs or specialized centers for individuals with hearing impairments.
List of Ph.D. in Education Courses
The list of courses provided in the Ph.D. in Education program by SGT University, the best Ph.D. college in Haryana,
Doctor of Philosophy (Education)
Doctor of Philosophy (Special Education - Intellectual Disability)
Doctor of Philosophy (Special Education - Hearing Impairment)
Doctor of Philosophy (Special Education - Disability)
Doctor of Philosophy (Special Education - Learning Disability)
About Ph.D. courses
Doctor of Philosophy (Education)
A doctoral degree program that focuses on advanced research and educational leadership roles.
Ph.D. in Education Course Admission Eligibility
To be eligible for admission in the Ph.D. course, a candidate must have a postgraduate degree in education with 55% marks.
Ph.D. in Education course Fee Structure
The total fee (per annum) for pursuing the Ph.D. course program is INR 1,50,000 at SGT University, the best Ph.D. in education college in Haryana.
Curriculum for Ph.D. in Education
The Ph.D. in Education curriculum is designed to train students to provide a solid foundation in education theory, research methods, and specialized knowledge in chosen area of concentration. The coursework and research experiences prepare the students for career in academia, educational research organizations, or leadership roles in educational institutions.
Career after Ph.D. in Education
After completing a Ph.D. in education, graduates can pursue careers in:
Academia as Professors and Researchers
Conduct Research
Entrepreneurship and Educational Business
Educational Consulting and Policy
Higher Education Administration
Educational Technology and Instructional Design
Doctor of Philosophy (Special Education - Intellectual Disability)
A doctoral degree program that focuses on advanced research and educational leadership roles.
Ph.D. (Special Education - Intellectual Disability) Admission Eligibility
To be eligible for admission in the Ph.D. in Special Education - Intellectual Disability course, a candidate must have M. Ed. Special Education in concerned specialization with a minimum of 55% marks.
Ph.D. (Special Education - Intellectual Disability) course Fee Structure
The total fee (per annum) for pursuing the Ph.D. in Special Education - Intellectual Disability course program is INR 1,50,000 at SGT University, the best Ph.D. in special education college in Haryana.
Curriculum for Ph.D. (Special Education - Intellectual Disability) in Education
The Ph.D. in Special Education - Intellectual Disability curriculum is designed to train students in activities, attend seminars and conferences, and present their work at professional meetings. Additionally, they may have opportunities to collaborate with faculty members on research projects, publications, and grant proposals.
The specific course overall goal of a Ph.D. program in Special Education - Intellectual Disability is to prepare individuals for leadership roles in higher education, research, policy development, and administration related to the education and support of individuals with intellectual disabilities.
Career after Ph.D. (Special Education - Intellectual Disability)
After completing a Ph.D. in Special Education - Intellectual Disability, graduates can pursue careers in:
Academia as Professors and Researchers
Research Scientist or Research Associate
Consultant or Program Evaluator
Policymaker or Advocate
Administrator or Director
Private Practice or Entrepreneurship
Continuing in Academia
Doctor of Philosophy (Special Education - Hearing Impairment)
A doctoral degree program that focuses on advanced research and educational leadership roles.
Ph.D. (Special Education -Hearing Impairment ) Admission Eligibility
To be eligible for admission in the Ph.D. in Special Education - Hearing Impairment course, a candidate must have M. Ed. Special Education in concerned specialization with a minimum of 55% marks
Ph.D. (Special Education - Hearing Impairment) course Fee Structure
The total fee (per annum) for pursuing the Ph.D. in Special Education - Hearing Impairment course program is INR 1,50,000 at SGT University, the best Ph.D. in special education college in Haryana.
Curriculum for Ph.D. (Special Education - Hearing Impairment) in Education
The Ph.D. in Special Education - Hearing Impairment curriculum covers the essential components, including core special education courses, concentration courses specific to hearing impairment, research methods training, field experiences, and a dissertation research project related to hearing impairment. Additional elective courses could be included based on the specific program and student interests.
Career after Ph.D. (Special Education -Hearing Impairment)
After completing a Ph.D. in Special Education - Hearing Impairment , graduates can pursue careers in:
Academia as Professors and Researchers
Teacher Educator/Trainer
Curriculum Developer/Instructional Designer
Educational Consultant/Specialist
Leadership and Administration
Research Scientist/Program Evaluator
Advocacy and Policy Roles
Doctor of Philosophy (Special Education - Visual Disability)
A doctoral degree program that focuses on advanced research and educational leadership roles.
Ph.D. (Special Education - Visual Disability) Admission Eligibility
To be eligible for admission in the Ph.D. in Special Education - Visual Disability course, a candidate must have M. Ed. Special Education in concerned specialization with a minimum of 55% marks.
Ph.D. (Special Education - Visual Disability) course Fee Structure
The total fee (per annum) for pursuing the Ph.D. in Special Education - Visual Disability course program is INR 1,50,000 at SGT University, the best Ph.D. in special education college in Haryana.
Curriculum for Ph.D. (Special Education - Visual Disability) in Education
The Ph.D. in Special Education - Visual Disability curriculum covers the essential components, including core special education courses, concentration courses specific to visual disability, research methods training, field experiences, and a dissertation research project related to visual disability. Additional elective courses could be included based on the specific program and student interests.
Career after Ph.D. (Special Education - Visual Disability)
After completing a Ph.D. in Special Education - Visual Disability , graduates can pursue careers in:
Academia as Professors and Researchers
Teacher Educator/Trainer
Consultant or Specialist in School Districts or State Agencies
Administrator or Director of Special Education Programs
Researcher or Research Associate in Institutions or Organizations
Independent Consultant or Private Practice
Policy Analyst or Advocate
Doctor of Philosophy (Special Education - Learning Disability)
A doctoral degree program that focuses on advanced research and educational leadership roles.
Ph.D. (Special Education - Learning Disability) Admission Eligibility
To be eligible for admission in the Ph.D. in Special Education - Learning Disability course, a candidate must have M. Ed. Special Education in concerned specialization with a minimum of 55% marks.
Ph.D. (Special Education - Learning Disability) course Fee Structure
The total fee (per annum) for pursuing the Ph.D. in Special Education - Learning Disability course program is INR 1,50,000 at SGT University, the best Ph.D. in special education college in Haryana.
Curriculum for Ph.D. (Special Education - Learning Disability) in Education
The Ph.D. in Special Education - Learning Disability curriculum covers the essential components, including core special education courses, concentration courses specific to learning disability, research methods training, field experiences, and a dissertation research project related to learning disability. Additional elective courses could be included based on the specific program and student interests.
Career after Ph.D. (Special Education - Learning Disability)
After completing a Ph.D. in Special Education - Learning Disability , graduates can pursue careers in:
Academia as Professors and Researchers
Teacher Educator/Trainer
Consultant or Specialist in School Districts or State Agencies
Administrator or Director of Special Education Programs
Researcher or Research Associate in Institutions or Organizations
Independent Consultant or Private Practice
Policy Analyst or Advocate
Conclusion
The field of education is more than just a career choice – it is a noble calling that shapes the minds of future generations. By pursuing an advanced degree, such as a master's or PhD in education, you can unlock a world of opportunities to make a profound and lasting impact.
Pursuing an advanced degree in education is not just a career aspiration, but a calling to shape the minds of future generations. Through rigorous coursework, hands-on practicum experiences, and cutting-edge research, a master's or doctoral program in education equips scholars with the knowledge and skills to tackle the most pressing challenges facing today's classrooms.
If you have a passion for teaching and want to make a positive impact on the lives of students, earning a Master or Ph.D. degree in education is an excellent path to consider. Enroll in a reputable education program today and embark on a journey that will have a lasting impact on countless lives. The world has more dedicated, enthusiastic teachers, and our journey starts by taking the critical first step.
Source:-(https://sgtuniversity.ac.in/education/blogs/turning-your-love-of-learning-into-a-career) | sumit_2f7b895defa191cff9b | |
1,891,978 | What are the Advantages of Altcoins? | These are some of the advantages of Altcoins- Employing New Technologies Altcoins have become... | 0 | 2024-06-18T05:30:34 | https://dev.to/lillywilson/what-are-the-advantages-of-altcoins-4g5i | cryptocurrency, bitcoin, asic, altcoin | These are some of the advantages of **[Altcoins](https://asicmarketplace.com/blog/what-are-altcoins/)**-
1. Employing New Technologies
Altcoins have become popular due to their unique qualities and usefulness. They are also valuable. Altcoins are a great way for tech users to become familiar with blockchain technology, especially as new applications and breakthroughs arise.
2. Crypto-specific uses
Altcoins have a specific purpose, unlike Bitcoins. For example, those who own governance altcoins can perform traditional managerial tasks. They can also alter the project protocol. Alternative currencies may also be tied to non-governance right, such as the option to exchange certain other tokens for set prices.
| lillywilson |
1,891,977 | Introducing SCHOL-IN: Simplifying Student Registration | I'm excited to share a project I've been working on for my Higher National Diploma (HND) defense: an... | 0 | 2024-06-18T05:30:29 | https://dev.to/g87code/introducing-schol-in-simplifying-student-registration-38am | webdev, javascript, beginners, programming |
I'm excited to share a project I've been working on for my Higher National Diploma (HND) defense: an Online Student Registration System (OSRS) called SCHOL-IN. This system aims to make the student registration process easy and stress-free for both students and educational institutions.
## Why SCHOL-IN?
The idea for SCHOL-IN came from observing how difficult and time-consuming student registration can be. Long lines, confusing paperwork, and errors in manual data entry can make registration a frustrating experience. SCHOL-IN is designed to solve these problems by using technology to create a smooth and efficient registration process.
## Key Features of SCHOL-IN
1. Easy to Use: SCHOL-IN has a simple and intuitive interface. Students can easily navigate through the registration steps without any confusion.
2. Automated Process: The system automates many parts of the registration process, such as form filling and data checking. This reduces errors and saves time for both students and staff.
3. Instant Updates: Students receive instant notifications about their registration status, so they always know what’s happening and what they need to do next.
4. Secure Data: Keeping student information safe is a top priority. SCHOL-IN uses strong security measures to protect all data.
Customizable Forms: Every institution is different, so SCHOL-IN allows for customizable forms to meet specific needs without losing standardization.
5. Integration with Other Systems: SCHOL-IN can easily integrate with existing databases and learning management systems (LMS), ensuring smooth data flow and operational efficiency.
Scalability: Whether it's a small community college or a large university, SCHOL-IN can handle the registration needs of any institution.
## Benefits of SCHOL-IN
1. Saves Time: By automating the process, SCHOL-IN reduces the time and effort required for registration. This means less work for staff and faster registration for students.
2. Reduces Errors: Automation helps to eliminate mistakes that often happen with manual data entry, ensuring accurate and reliable student records.
3. Enhances User Experience: With its simple design and real-time updates, SCHOL-IN makes registration less stressful and more enjoyable for students.
4. Data Insights: SCHOL-IN provides valuable data that institutions can use to improve course offerings and resource allocation.
5. **Accessible Anywhere**: Students can register from any device with an internet connection, making the process convenient and flexible.
**Looking Ahead**
While SCHOL-IN is still in development, I'm excited about its potential to transform the registration process. Future updates will include personalized recommendations, better mobile accessibility, and advanced analytics to provide deeper insights.
**Conclusion**
SCHOL-IN is set to revolutionize how student registration is handled, making it more efficient, accurate, and user-friendly. This project is a significant step towards improving the educational experience for both students and administrators.
I’m eager to continue developing SCHOL-IN and exploring its full potential. If you’re interested in learning more or discussing possible collaborations, feel free to connect with me. Together, we can create a better, more efficient future for student registration.
| g87code |
1,891,853 | How I Passed the AWS Developer Associate Exam (DVA-02): A Rollercoaster Ride of Challenges and Triumphs 🚀 | Ever wondered if practical knowledge is crucial for passing certification exams? Or if the AWS... | 0 | 2024-06-18T05:30:00 | https://dev.to/sarthaksavvy/how-i-passed-the-aws-developer-associate-exam-dva-02-a-rollercoaster-ride-of-challenges-and-triumphs-6g2 | aws, awschallenge, certification |
Ever wondered if practical knowledge is crucial for passing certification exams? Or if the AWS Developer Associate exam is hard or easy to crack? Here’s my story!
After 3 months of dedicated preparation, diving into every important topic, I started with AWS SkillBuilder, the official AWS study portal. While SkillBuilder offers a comprehensive syllabus and sample exams, the limited number of full-length practice tests can be a drawback. Re-taking these exams might lead you to memorize answers rather than truly understand the material.
To keep my preparation exciting and effective, I invested in Udemy's practice exam course for the DVA-02, which includes six challenging practice exams. Trust me, these are tougher than the actual exam! If you can pass the Udemy tests, your chances of acing the real DVA-02 exam are high.
Choosing to take the exam online added another layer of adventure. On exam day, my internet connection slowed down, and I faced a 15-minute struggle to start the Pearson Vue app. Once connected, I had to wait in a queue for another 15 minutes, unable to move away from the webcam. Just when I thought things couldn't get worse, my internet issues pushed me into another 15-minute queue!
Finally, the exam began, and the questions seemed harder than anticipated. I used a strategy of skipping long or unfamiliar questions, focusing on the ones I was confident about. This approach allowed me to tackle the last question within 50 minutes, having skipped 33 questions initially. I marked the unsure ones for review and managed to answer everything within the time limit.
But the thrill didn’t end there. Unlike the usual instant results, my screen displayed a message saying my results would be available in 5 working days. Imagine the suspense! Thankfully, the same evening, I received an email announcing that I had passed the exam.
My key takeaway? The more practical experience you gain, the better you learn and can relate to the questions. The exam questions are more tricky than tough, so thorough preparation is essential.
Thinking about taking the AWS Developer Associate exam? Comment below if you’d like me to write another post on exam preparation tips.
Thanks for reading! If you want to stay connected, subscribe to my newsletter at [bitfumes.com/newsletters](https://bitfumes.com/newsletters). For any questions, feel free to DM me. Let's ace those exams together! 💪 | sarthaksavvy |
1,891,976 | Speed Key Shop: Affordable Microsoft Software for Enhanced Productivity | In the modern world, effective software solutions are key to achieving success in both personal and... | 0 | 2024-06-18T05:27:42 | https://dev.to/daltonweller/speed-key-shop-affordable-microsoft-software-for-enhanced-productivity-51fb | <p>In the modern world, effective software solutions are key to achieving success in both personal and professional endeavors. Microsoft, a leader in the technology industry, offers a range of products designed to meet various needs. Speed Key Shop brings these top-quality Microsoft products to you at unbeatable prices. From Windows operating systems to the Microsoft Office Suite, Speed Key Shop ensures you have access to the best tools to enhance your productivity.</p>
<h2><strong>The Importance of Microsoft Software</strong></h2>
<h3><strong>Innovative and Reliable</strong></h3>
<p>Microsoft software is renowned for its innovation and reliability. Products like Windows and Office are continually updated to include the latest features and security enhancements. This commitment to quality ensures that users can rely on <a href="https://speedkeyshop.com/"><strong>Microsoft software</strong></a> for their daily tasks, knowing that they are using tools that are both cutting-edge and dependable.</p>
<h3><strong>Broad Range of Applications</strong></h3>
<p>Microsoft offers a broad range of applications designed to cater to different needs. For example, Windows operating systems are ideal for general computing, while Microsoft Office provides tools for document creation, data analysis, and presentations. These applications are designed to work seamlessly together, providing a cohesive and efficient user experience.</p>
<h2><strong>Why Buy from Speed Key Shop?</strong></h2>
<h3><strong>Exceptional Value</strong></h3>
<p>Speed Key Shop is committed to offering exceptional value. We provide Microsoft software at prices that are significantly lower than traditional retail prices. This affordability means that more people can access high-quality software without straining their budgets. By choosing Speed Key Shop, you can enjoy the benefits of Microsoft products without paying a premium.</p>
<h3><strong>Genuine Products</strong></h3>
<p>When you purchase from Speed Key Shop, you can be confident that you are getting genuine <a href="https://speedkeyshop.com/"><strong>Microsoft products</strong></a>. We provide authentic licenses, ensuring that you receive legitimate software that performs as expected. Our commitment to authenticity means that you can trust the quality and reliability of the products you buy from us.</p>
<h2><strong>Boosting Productivity with Microsoft Products</strong></h2>
<h3><strong>Windows Operating Systems</strong></h3>
<p>Windows operating systems are known for their user-friendly interface and powerful features. Whether you need Windows 10 or the latest Windows 11, Speed Key Shop has you covered. Upgrading your operating system can enhance your computer's performance, provide better security, and give you access to the latest features and updates.</p>
<h3><strong>The Comprehensive Microsoft Office Suite</strong></h3>
<p>The Microsoft Office Suite is essential for anyone looking to increase their productivity. With applications like Word for writing, Excel for spreadsheets, and PowerPoint for presentations, Office provides all the tools you need to succeed. Speed Key Shop offers various versions of Office, allowing you to choose the one that best fits your needs.</p>
<h3><strong>Specialized Microsoft Software</strong></h3>
<p>Microsoft also offers specialized software for different industries and tasks. For example, Microsoft Azure provides cloud computing solutions, while Microsoft Visual Studio is ideal for developers. Speed Key Shop offers these specialized products, ensuring that you have the right tools for your specific needs.</p>
<h2><strong>Conclusion</strong></h2>
<p>Microsoft software is essential for enhancing productivity and ensuring smooth operations in today's digital world. Speed Key Shop makes these top-quality products accessible to everyone by offering them at unbeatable prices. Whether you need an operating system, a productivity suite, or specialized software, Speed Key Shop has what you need. Visit our website today and discover the benefits of buying Microsoft software from a trusted provider.</p> | daltonweller | |
1,884,123 | Amazon CloudFormation Custom Resources Best Practices with CDK and Python Examples | When I started developing services on AWS, I thought CloudFormation resources could cover all my... | 0 | 2024-06-18T05:23:43 | https://www.ranthebuilder.cloud/post/amazon-cloudformation-custom-resources-best-practices-with-cdk-and-python-examples | aws, cloudformation, devops, iac | 
When I started developing services on AWS, I thought CloudFormation resources could cover all my needs. **I was wrong.**
I quickly discovered that production environments are complex, with numerous edge cases. Fortunately, CloudFormation allows for extension through custom resources. While custom resources can be handy, improper implementation can result in stack failures, deletion issues, and significant headaches.
**In this blog post, we’ll explore CloudFormation custom resources, why you need them, and their different types. We’ll also define best practices for implementing them correctly with AWS CDK and Python code examples using [Powertools for AWS](https://github.com/aws-powertools/powertools-lambda-python), [Pydantic](https://pydantic.dev/) and [crhelper](https://pypi.org/project/crhelper/).**
](https://cdn-images-1.medium.com/max/2624/0*lrHYLOizEg3p81m0.png)
**This blog post was originally published on my website, [“Ran The Builder.”](https://www.ranthebuilder.cloud/)**
## Table of Contents
1. **The Case for a CloudFormation Custom Resource**
2. Post Deployment Scripts
3. Custom Resource — One Stack to Rule Them All
4. **CloudFormation Custom Resource Types**
5. Plain AWS SDK Calls
6. SNS-Backed Custom Resource
7. Lambda Backed Custom Resource
8. **Custom Resources Best Practices**
9. **Summary**
## The Case for a CloudFormation Custom Resource
> *CloudFormation can be useful when your provisioning requirements involve complex logic or workflows that can’t be expressed with CloudFormation’s built-in resource types. — AWS [Docs](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html)*
Here are some examples that come to mind:
1. Adding a database to an Aurora cluster.
2. Creating a Cognito admin/test user for a user pool.
3. Creating a Route53 DNS entry or creating a certificate in a domain created in a different AWS account.
4. Uploading a JSON file as an observability dashboard to DataDog
5. You want to trigger a resource provisioning that takes a lot of time — maybe up to an hour.
6. Any non AWS resource that you wish to create.
### Post Deployment Scripts
To counter such scenarios, I’ve seen people add a mysterious ‘post_deploy’ script to their CI/CD pipeline that runs after the CF deployment stage and creates the missing resources and configurations via API calls.
It’s **dangerous**. If that script fails, you cannot automatically revert the CF stack deployment as it has already been done leaving your service in an unstable state.
In addition, people forget that resources have a lifecycle and handle object deletion, thus keeping many orphaned resources when the stack is deleted.
### Custom Resource — One Stack to Rule Them All
The way I see it, everything that you do in the pipeline in deployment stage, any resource that you add or reconfigure should update together as there are dependancies, and if there’s a failure, CloudFormation will reliably revert the stack deployment and safeguard your production from being broken.
Our solution is to stress the importance of including ALL resources and configuration changes, including their lifecycle event handling (more on that below), as part of the CloudFormation stack as a [**custom resource](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html)**.
However, it’s not all roses and daisies. Many people stay away from custom resources because mistakes can be highly annoying — from the custom resources failing to delete to waiting for up to an hour for a stack to fail deployment.
Rest assured, you’d be fine if you followed the code examples and best practices.
Let’s review the types of custom resources.
## CloudFormation Custom Resource Types
It’s important to remember that every CloudFormation resource has life cycle events it needs to implement. The main events include creation, update (due to logical ID or configuration changes), and deletion. When we build our custom resource, we will need to define its behavior in reaction to these CloudFormation events.
There are three types of custom resources; let’s list them from the simplest to the most customized and complicated options:
1. Plain AWS SDK calls — simple, less code to write
2. SNS-backed resource — more complicated
3. Lambda-backed resource — the most complicated but the most flexible
Let’s start with the first type.
## Plain AWS SDK Calls
This is the simplest way to implement a custom resource. In the example below, we want to create a Cognito user pool test user right after the user pool is created.
The process of creating and deleting a user is as simple as making a call to the AWS SDK. You can find the necessary steps [[here](https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_AdminCreateUser.html)] and [[here](https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_AdminDeleteUser.html)].
Let’s see how we can translate these API calls to a simple CDK object.
{% gist https://gist.github.com/ran-isenberg/31f5639e219e3cb7606bb28d9d5f3c69.js %}
We define a CDK function that receives a Cognito user pool object used as SDK parameters (its ID and ARN).
In line 7, we create a new ‘AwsCustomResource’ instance.
In line 10, we pass the API definition for the creation process: the boto SDK service, the API name: ‘[adminCreateUser](https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_AdminCreateUser.html),’ and its parameters. Similarly, we can add ‘on_delete’ and ‘on_update’ handlers.
Behind the scenes, AWS creates a singleton Lambda function that handles the CloudFormation lifecycle events for you — super simple and easy!
In line 26, we add a dependency; this resource depends on the user pool created before running an API.
**Bottom line: if you can map your lifecycle events to AWS SDK API calls, it’s the best and most straightforward way to cover CloudFormation’s missing capabilities with minimal code.**
## SNS-Backed Custom Resource
The second type is an interesting one.
I’d use this custom resource to trigger long provisioning (up to an hour!) in a decoupled and async manner via an SNS message. Depending on where the SNS topic resides, it can create resources or configurations, even in a different account.
One practical application of this custom resource type is to send all custom resource creation information to a centralized account. This allows for easy tracking of unique resources, enhancing organizational visibility.
This is a use case I describe in an article that I wrote with [Bill Tarr](https://www.linkedin.com/in/bill-tarr-san-diego/) from the AWS SaaS factory for the cloud operations AWS blog website. It will be hopefully released soon.
The entire GitHub repository can be found [here](https://github.com/ran-isenberg/governance-sample-aws-service-catalog).
### Event Flow
Let’s review the custom resource creation flow below. Please note that the SNS to SQS to Lambda pattern is not given in the CDK below, it is assumed that the SNS topic owner (perhaps even in a different CF stack), creates this pattern. However, I will provide the Lambda function code as it has specific custom resource logic related code.
Custom resource creation event flow:
1. Parameters are sent as a dictionary to the SNS topic. You must ensure the topic accepts messages from the deploying account/organization.
2. SNS topic passes the message to its subscriber, the SQS queue.
3. SQS queue triggers the Lambda function with a batch of messages (min size is 1).
4. The Lambda function parses the messages and extracts the custom resource event type (create/delete/update) and its parameters, which appear at the ‘resource_properties’ property of SQS body massage. Note that you will be given both the previous and current parameters for an update event.
5. The Lambda function handles the logic aspect of the custom resource, creating or configuring resources.
6. The lambda function sends a POST request to the pre-signed S3 URL path that is part of the event with the correct status: failure/success and any other required information. Click [here](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html#how-custom-resources-work) for a ‘create’ event example.
7. Custom resource is released from its wait state, deployment ends with a success or failure (reverted).
During the deployment in stage 1, the custom resource enters a wait state after it sends an SNS message. The message receiver needs to release the resource from its [wait state](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html#how-custom-resources-work). If an hour passes without this release (default timeout time), the stack fails on a timeout, and a revert takes place. If the message receiver sends a failure message back, the stack fails, and a revert takes place.
The receiver must send an HTTP POST request with a specific body that marks success or failure to a [pre-signed S3 URL](https://docs.aws.amazon.com/AmazonS3/latest/userguide/ShareObjectPreSignedURL.html) the custom resource generates.
Elements 2–6 can be part of a different AWS account belonging to a different team entirely in your organization and serve as a ‘black box’ orchestration. In that case, you just build the Custom resource, which is relatively easy.
### Custom Resource CDK Code
Let’s start with the custom resource definition. The custom resource sends the SNS topic a message with predefined parameters as the message body. Each life-cycle event (create, delete, update) will automatically send a different SNS message attributes with the CDK properties we defined. In an update event, both the current and previous parameters are sent.
{% gist https://gist.github.com/ran-isenberg/c2670462cfe2e1880ff22a12b23d15b0.js %}
In lines 9–18, we define the custom resource.
In line 12, we provide the SNS topic ARN as the message target.
In line 13, we define the resource type (it will appear in the CF console), and it must start with ‘Custom::.’
In line 15, we define the dictionary SNS message payload that will be sent to the topic. We can use any set of keys and values we want as long as their value is known during deployment.
### Lambda Function’s Code
Let’s review the receiver side of the flow and how it handles the CF custom resource events. We will use the library ‘[cr_helper](https://github.com/aws-cloudformation/custom-resource-helper)’ to handle the events with a combination of Powertools’ Parser [utility](https://docs.powertools.aws.dev/lambda/python/latest/utilities/parser/) for input validation with ‘pydantic.’ ‘cr_helper’ will route the correct event to the appropriate function inside the handler, manage the response to the S3 pre-signed URL, and handle errors (send a failure response for every uncaught exception).
The code below is taken from one of my open-source projects, which deploys Service Catalog products and uses custom resources and SNS messages. Other than the code under the ‘logic’ folder, which you can replace with your own implementation, most of the code is generic.
You can view the complete code [here](https://github.com/ran-isenberg/governance-sample-aws-service-catalog/blob/main/catalog_backend/handlers/product_callback_handler.py).
The flow is simple:
1. Initialize the CR helper library. It will handle the routing to the inner event handler functions and, once completed, release the custom resource from a wait state (see 2c below) with an HTTP request.
2. Iterate the batch of SQS messages and per SQS message:
3. Route to the correct inner function according to the SQS message body, the custom resource CF event. Route ‘create’ events to my ‘create_event’ function, ‘delete’ to the ‘delete_event’ function, and update’ to ‘update_event.’
4. Each ‘x_event’ function parses the input according to the expected parameters defined in the CDK code according to the ‘CloudFormationCustomResource’ schemas (lines 5–7). We leverage Powertools for the AWS parser [utility](https://docs.powertools.aws.dev/lambda/python/latest/utilities/parser/) and pass the payload to the logic layer that creates deletes, or updates resources.
5. ‘cr_helper’ sends an HTTP POST request to the pre-signed URL with either success or failure information. Failure is sent when the inner event handlers raise an exception.
{% gist https://gist.github.com/ran-isenberg/9e0e1d222a504d074c16a72d338a94d8.js %}
In line 13, we import the event handler logic functions, which are in charge of the resource logic. Replace this import with your implementation. I followed a Lambda best practice of writing the function with architectural layers. Click [here](https://www.ranthebuilder.cloud/post/learn-how-to-write-aws-lambda-functions-with-architecture-layers) to learn more.
In lines 17–22, we initialize the ‘cr_helper’ helper utility.
In line 43, we must return a resource ID in the ‘create_event’ function. It’s crucial to make sure it is unique. Otherwise, you won’t be able to create multiple custom resources of this type in the same account.
In line 50, we implement an update flow. This can happen when either the resource id changes or the input parameters change. The CloudFormation event will contain both the current and previous parameters so it’s possible to find the differences and make changes in the logic code accordingly.
**The bottom line is that if you need to trigger a provision or logic in another account or service (that might belong to another team), this is a great way to decouple this logic between the services and allow a long process, which can last up to an hour.**
## Lambda Backed Custom Resource
In this case, the custom resource triggers a Lambda function with a CloudFormation life-cycle event to handle. It’s beneficial in cases where you want to write yourself the entire provision flow and maintain it in the same project; that’s in contrast to the previous custom resource where you send an async message to an SNS topic and let someone else handle the resource logic.
Let’s review the custom resource creation flow in the diagram below.
### Event Flow
Custom resource creation event Flow:
1. Parameters are sent as a dictionary as part of the event to the invoked Lambda function.
2. Lambda function parses the messages, extracts the custom resource event type (create/delete/update) and its parameters that appear at ‘resource_properties’. Note that for an ‘update’ event you will be given both the previous and current parameters.
3. The Lambda function handles the logic aspect of the custom resource, creating or configuring resources.
4. The lambda function sends a POST request to the pre-signed S3 URL path (‘ResponseURL’ in the event) that is part of the event with the correct status: failure/success and any other required information. Click [here](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html#how-custom-resources-work) for a ‘create’ event example.
5. Custom resource is released from its wait state, deployment ends with a success or failure (reverted).
You can use this resource to trigger a longer provision process (up to an hour) by triggering a Step Function state machine in the Lambda function, as long as you send the S3 pre-signed URL to that process so it can mark the result instead.
### Custom Resource CDK Code
Let’s review the code below.
{% gist https://gist.github.com/ran-isenberg/b2a22df1415a17b8cf8ec3640c9b4e3c.js %}
In lines 10–16, we build the Lambda function to handle the CF custom resource events.
In line 18, we define a provider, a synonym for an event handler, and set our lambda function as the custom resource event target.
In lines 19–27, we define the custom resource and set the service_token as the provider’s service token. See the provider definition [here](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html#how-custom-resources-work).
In lines 24–25, we define the input parameters we want the Lambda to receive. We can pass whatever parameters the Lambda can use during the provisioning process.
In line 27, we set the custom resource type in the CF console. It must start with ‘Custom::.’
### Lambda Function’s Code
Let’s review the function’s code below. It will be familiar to the previous example, without the SQS batch iteration section, which is replaced with a global error handler in lines 19–23.
We define one function for each event type: create, update, delete, and the ‘helper’ library knows which one to trigger based on the incoming input event properties.
Pydantic and Powertools’s parser utility are used as before to parse the input of every event. This input is then passed to any logic function you write to handle the event: create a resource, send an API request, delete resources, etc.
{% gist https://gist.github.com/ran-isenberg/41a0bb03bd124f5f0459d1834c671620.js %}
As before, we need to return a resource ID in the ‘create_event’ function. It’s crucial to make sure it is unique; otherwise, you won’t be able to create multiple custom resources of this type in the same account.
As in the SNS example, the functions ‘handle_delete,’ ‘handle_create,’ and ‘handle_update’ are your implementation logic.
**Bottom line: If you need to trigger a flow and manage it entirely in the same account via Lambda function code, this is a great way to do so and handle its life-cycle events.**
## Custom Resources Best Practices
Custom resources are error prone and you must put extra care into your error handling code.
Failing to do so, can result in resources that CF cannot delete.
Here are a few pointers:
1. Use the tools in this guide: ‘cr_helper’ and Powertools.
2. Read the documents specified in this guide to make sure you understand the input events and when each event is sent.
3. Understand timeouts and ensure you configure all the resources accordingly — Lambda timeout definition, CR timeout, etc.
4. Try to be as flexible in the Lambda function logic implementation as possible. Don’t fail on every issue. For example, if you need to delete a resource via API and it’s not there, you can return a success instead of failing.
5. Test, test and test again, flows of create, update and delete. Be creative and ensure proper integration and E2E tests for your Lambda. Learn [here](https://www.ranthebuilder.cloud/post/guide-to-serverless-lambda-testing-best-practices-part-1) in my testing blog series about serverless tests.
6. Set the custom resource timeout setting. It can [now](https://aws.amazon.com/about-aws/whats-new/2024/06/aws-cloudformation-dev-test-cycle-timeouts-custom-resources/) be changed so you don’t wait for an hour in case of an error in your code.
7. ‘cr_helper’ also provides a polling mechanism helper for longer creation flows — use it when required. I have yet to use it. See [the readme](https://github.com/aws-cloudformation/custom-resource-helper).
Finally, choose the simplest custom resource that makes sense to you. Don’t over-engineer and think about custom resource team ownership. Decouple when possible with the SNS mechanism if another team handles the provision flow. In that case, it’s best to do it in a centralized manner.
## Summary
This post covered several cases CloudFormation native resources don’t cover. We learned of custom resources and their types, their use cases and reviewed general best practices with CDK and Python code.
| ranisenberg |
1,891,975 | The Logic of Crypto Currency Futures Trading | Problem scene For a long time, the data delay problem of the API interface of the crypto... | 0 | 2024-06-18T05:23:08 | https://dev.to/fmzquant/the-logic-of-crypto-currency-futures-trading-4hpe | trading, cryptocurrency, futures, fmzquant | ## Problem scene
For a long time, the data delay problem of the API interface of the crypto currency exchange has always troubled me. I haven't found a suitable way to deal with it. I will reproduce the scene of this problem.
Usually the market order provided by the contract exchange is actually the counterparty price, so sometimes the so-called "market order" is somewhat unreliable. Therefore, when we write crypto currency futures trading strategies, most of them use limit orders. After each order is placed, we need to check the position to see if the order is filled and the corresponding position is held.
The problem lies in this position information. If the order is closed, the data returned by the exchange position information interface (that is, the exchange interface that the bottom layer actually accesses when we call exchange.GetPosition) should contain the information of the newly opened position, but If the data returned by the exchange is old data, that is, the position information of the order just placed before the transaction is completed, this will cause a problem.
The trading logic may consider that the order has not been filled and continue to place the order. However, the order placement interface of the exchange is not delayed, but the transaction is fast, and the order is executed. This will cause a serious consequence that the strategy will repeatedly place orders when triggering the operation of opening a position.
## Actual Experience
Because of this problem, I have seen a strategy to fill a long position crazy, fortunately, the market was risen at that time, and the floating profit once exceeded 10BTC. Fortunately, the market has skyrocketed. If it is a plunge, the ending can be imagined.
## Try To Solve
- Plan 1
It is possible to design the logic of order placement for the strategy to place only one order. The order placing price is a large slippage for the price gap of opponent price at the time, and a certain depth of opponent orders can be executed. The advantage of this is that only one order is placed, and it is not judged based on position information. This can avoid the problem of repeated placing orders, but sometimes when the price changes relatively large, the order will trigger the exchange's price limit mechanism, and it may lead to that the large slippage order is still not completed, and missed the trading opportunity.
- Plan 2
Using the "market price" function of the exchange, the price pass -1 on the FMZ is the "market price". At present, the OKEX futures interface has been upgraded to support "real market price".
- Plan 3
We still use the previous trading logic and place a limit order, but we add some detection to the trading logic to try to solve the problem caused by the delay of the position data. After the order is placed, if the order is not cancelled, it disappears directly in the list of pending orders (the list of pending orders disappears in two possible ways: 1 withdraw order, 2 executed), detect such situation and place the order amount again. The amount of the last order is the same. At this time, it is necessary to pay attention to whether the position data is delayed. Let the program enter the waiting logic to reacquire the position information. You can even continue to optimize and increase the number of triggering waits. If it exceeds a certain number of times, the position interface data is delayed. The problem is serious, let the transaction logic terminate.
## Design based on Plan 3
```
// Parameter
/*
var MinAmount = 1
var SlidePrice = 5
var Interval = 500
*/
function GetPosition(e, contractType, direction) {
e.SetContractType(contractType)
var positions = _C(e.GetPosition);
for (var i = 0; i < positions.length; i++) {
if (positions[i].ContractType == contractType && positions[i].Type == direction) {
return positions[i]
}
}
return null
}
function Open(e, contractType, direction, opAmount) {
var initPosition = GetPosition(e, contractType, direction);
var isFirst = true;
var initAmount = initPosition ? initPosition.Amount : 0;
var nowPosition = initPosition;
var directBreak = false
var preNeedOpen = 0
var timeoutCount = 0
while (true) {
var ticker = _C(e.GetTicker)
var needOpen = opAmount;
if (isFirst) {
isFirst = false;
} else {
nowPosition = GetPosition(e, contractType, direction);
if (nowPosition) {
needOpen = opAmount - (nowPosition.Amount - initAmount);
}
// Detect directBreak and the position has not changed
if (preNeedOpen == needOpen && directBreak) {
Log("Suspected position data is delayed, wait 30 seconds", "#FF0000")
Sleep(30000)
nowPosition = GetPosition(e, contractType, direction);
if (nowPosition) {
needOpen = opAmount - (nowPosition.Amount - initAmount);
}
/*
timeoutCount++
if (timeoutCount > 10) {
Log("Suspected position delay for 10 consecutive times, placing order fails!", "#FF0000")
break
}
*/
} else {
timeoutCount = 0
}
}
if (needOpen < MinAmount) {
break;
}
var amount = needOpen;
preNeedOpen = needOpen
e.SetDirection(direction == PD_LONG ? "buy" : "sell");
var orderId;
if (direction == PD_LONG) {
orderId = e.Buy(ticker.Sell + SlidePrice, amount, "Open long position", contractType, ticker);
} else {
orderId = e.Sell(ticker.Buy - SlidePrice, amount, "Open short position", contractType, ticker);
}
directBreak = false
var n = 0
while (true) {
Sleep(Interval);
var orders = _C(e.GetOrders);
if (orders.length == 0) {
if (n == 0) {
directBreak = true
}
break;
}
for (var j = 0; j < orders.length; j++) {
e.CancelOrder(orders[j].Id);
if (j < (orders.length - 1)) {
Sleep(Interval);
}
}
n++
}
}
var ret = {
price: 0,
amount: 0,
position: nowPosition
};
if (!nowPosition) {
return ret;
}
if (!initPosition) {
ret.price = nowPosition.Price;
ret.amount = nowPosition.Amount;
} else {
ret.amount = nowPosition.Amount - initPosition.Amount;
ret.price = _N(((nowPosition.Price * nowPosition.Amount) - (initPosition.Price * initPosition.Amount)) / ret.amount);
}
return ret;
}
function Cover(e, contractType, opAmount, direction) {
var initPosition = null;
var position = null;
var isFirst = true;
while (true) {
while (true) {
Sleep(Interval);
var orders = _C(e.GetOrders);
if (orders.length == 0) {
break;
}
for (var j = 0; j < orders.length; j++) {
e.CancelOrder(orders[j].Id);
if (j < (orders.length - 1)) {
Sleep(Interval);
}
}
}
position = GetPosition(e, contractType, direction)
if (!position) {
break
}
if (isFirst == true) {
initPosition = position;
opAmount = Math.min(opAmount, initPosition.Amount)
isFirst = false;
}
var amount = opAmount - (initPosition.Amount - position.Amount)
if (amount <= 0) {
break
}
var ticker = _C(exchange.GetTicker)
if (position.Type == PD_LONG) {
e.SetDirection("closebuy");
e.Sell(ticker.Buy - SlidePrice, amount, "Close long position", contractType, ticker);
} else if (position.Type == PD_SHORT) {
e.SetDirection("closesell");
e.Buy(ticker.Sell + SlidePrice, amount, "Close short position", contractType, ticker);
}
Sleep(Interval)
}
return position
}
$.OpenLong = function(e, contractType, amount) {
if (typeof(e) == "string") {
amount = contractType
contractType = e
e = exchange
}
return Open(e, contractType, PD_LONG, amount);
}
$.OpenShort = function(e, contractType, amount) {
if (typeof(e) == "string") {
amount = contractType
contractType = e
e = exchange
}
return Open(e, contractType, PD_SHORT, amount);
};
$.CoverLong = function(e, contractType, amount) {
if (typeof(e) == "string") {
amount = contractType
contractType = e
e = exchange
}
return Cover(e, contractType, amount, PD_LONG);
};
$.CoverShort = function(e, contractType, amount) {
if (typeof(e) == "string") {
amount = contractType
contractType = e
e = exchange
}
return Cover(e, contractType, amount, PD_SHORT);
};
function main() {
Log(exchange.GetPosition())
var info = $.OpenLong(exchange, "quarter", 100)
Log(info, "#FF0000")
Log(exchange.GetPosition())
info = $.CoverLong(exchange, "quarter", 30)
Log(exchange.GetPosition())
Log(info, "#FF0000")
info = $.CoverLong(exchange, "quarter", 80)
Log(exchange.GetPosition())
Log(info, "#FF0000")
}
```
Template address: https://www.fmz.com/strategy/203258
The way to call the template interface is just like $.OpenLong and $.CoverLong in the main function above.
The template is a beta version, any suggestions are welcome, i will continue to optimize to deal with the problem of delays in position data.
From: https://www.fmz.com/digest-topic/5908 | fmzquant |
1,891,969 | Will Enterprise AI Spark Unprecedented Innovation or Unpredictable Chaos? | Artificial Intelligence has woven itself deeply into the fabric of modern business operations,... | 0 | 2024-06-18T05:20:08 | https://dev.to/wharrington/will-enterprise-ai-spark-unprecedented-innovation-or-unpredictable-chaos-gbf | enterpriseai, ai, future | Artificial Intelligence has woven itself deeply into the fabric of modern business operations, promising transformative capabilities across industries. As enterprises increasingly integrate AI into their workflows, the question arises: will this integration lead to unprecedented innovation or unpredictable chaos?
At its core, Enterprise AI development company aims to enhance efficiency, productivity, and decision-making through advanced algorithms and machine learning models. By leveraging vast amounts of data, AI systems can uncover patterns, automate tasks, and provide insights that humans alone might overlook. This potential for optimization and insight fuels the belief in AI's transformative power.
**Unprecedented Innovation: A Paradigm Shift in Enterprise Dynamics**
The advent of Enterprise AI development company signifies more than just technological advancement; it represents a paradigm shift in how businesses operate. Industries such as healthcare, finance, manufacturing, and logistics are already witnessing AI-driven innovations that streamline processes and drive growth. For instance, in healthcare, AI-powered diagnostics and personalized treatment recommendations are revolutionizing patient care. In finance, AI algorithms analyze market trends in real-time, enabling faster and more accurate trading decisions.
Moreover, the integration of AI into customer relationship management (CRM) systems has enhanced customer service by providing personalized interactions and predictive analytics. This level of customization not only improves user experience but also boosts customer retention and loyalty.
**The Potential for Unpredictable Chaos: Challenges on the Horizon**
However, amidst the promises of innovation, there lurks a shadow of potential chaos. The rapid deployment of AI systems raises concerns about data privacy, algorithmic bias, and job displacement. Enterprises must navigate these challenges carefully to harness AI's potential without compromising ethical standards or causing unintended disruptions.
Data privacy breaches pose significant risks as AI systems handle vast amounts of sensitive information. The onus lies on Enterprise AI development company to implement robust security measures and adhere to stringent data protection regulations. Likewise, the issue of algorithmic bias underscores the importance of diversity and inclusivity in AI development to ensure fair and equitable outcomes for all stakeholders.
Furthermore, the fear of job displacement looms large as automation threatens to replace certain roles traditionally performed by humans. While AI creates new opportunities for skill development and job creation in technical and analytical domains, retraining and reskilling programs are crucial to mitigate the impact on displaced workers.
**Striking a Balance: Ethical Guidelines and Responsible AI Implementation**
To navigate the dichotomy between innovation and chaos, enterprises must prioritize ethical guidelines and responsible AI implementation. Establishing clear policies for data governance, transparency, and accountability is essential to build trust among consumers and regulatory bodies. Moreover, fostering a culture of ethical awareness within Enterprise AI development company ensures that AI systems uphold societal values and respect individual rights.
Collaboration between policymakers, industry leaders, and technology experts is crucial to develop frameworks that promote innovation while mitigating potential risks. Initiatives such as AI ethics boards and regulatory sandboxes provide platforms for dialogue and experimentation, enabling stakeholders to anticipate challenges and implement preemptive measures.
**The Road Ahead: Harnessing AI's Potential for Positive Change**
Despite the challenges and uncertainties, the trajectory of Enterprise AI development company points towards a future shaped by innovation and opportunity. By embracing AI as a tool for augmentation rather than replacement, enterprises can empower employees, enhance decision-making processes, and deliver personalized experiences that drive competitive advantage.
Moreover, AI-driven insights enable enterprises to anticipate market trends, optimize supply chains, and innovate products and services in response to evolving consumer preferences. This proactive approach not only strengthens market position but also fosters sustainable growth in an increasingly competitive landscape.
**Conclusion: A Balancing Act Between Innovation and Responsibility**
In conclusion, the integration of **[Enterprise AI development company](https://blocktunix.com/enterprise-ai-development-services/)** into business operations holds the promise of unprecedented innovation and efficiency gains. However, this transformation must be accompanied by robust ethical standards, responsible implementation practices, and proactive measures to address potential challenges.
As enterprises navigate the complexities of AI adoption, they must remain vigilant against the pitfalls of algorithmic bias, data privacy breaches, and job displacement. By prioritizing ethical guidelines and fostering collaboration across sectors, businesses can harness AI's transformative potential while minimizing unpredictable chaos.
In essence, the future of enterprise AI hinges not only on technological prowess but also on ethical foresight and responsible stewardship. By striking a balance between innovation and responsibility, enterprises can pave the way for a future where AI serves as a catalyst for positive change, driving growth, and enhancing human capabilities in unprecedented ways.
Learn More: _[The Future of Enterprise AI: Predictions for 2024 and Beyond](https://medium.com/@wharrington785/the-future-of-enterprise-ai-predictions-for-2024-and-beyond-de342ffdd984)_
| wharrington |
1,891,968 | WARN GET https://registry.npmjs.org error (ECONNRESET). Will retry in 10 seconds | unable to reach npmjs server with proper internet 10 20.91 WARN GET https://registry.npmjs.org... | 0 | 2024-06-18T05:18:36 | https://dev.to/hari13/warn-get-httpsregistrynpmjsorg-error-econnreset-will-retry-in-10-seconds-4nji | unable to reach npmjs server with proper internet
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#10 20.99 WARN GET https://registry.npmjs.org error (ECONNRESET). Will retry in 10 seconds. 2 retries left. | hari13 | |
1,891,967 | Scanning Documents to Web Pages with JavaScript and Dynamic Web TWAIN RESTful API | Dynamic Web TWAIN offers two methods for scanning documents from a web page: the HTML5/JavaScript API... | 13,126 | 2024-06-18T05:13:39 | https://www.dynamsoft.com/codepool/web-twain-rest-api-scan-document.html | webdev, javascript, programming, restapi | **Dynamic Web TWAIN** offers two methods for scanning documents from a web page: the **HTML5/JavaScript API** and the **RESTful API**. The former is suitable for web applications that require a high level of customization, while the latter is ideal for enterprise-class web applications, such as **Salesforce**, **Oracle APEX**, and **Microsoft Power Apps**, that need to scan documents in a sandboxed or security-restricted environment. This article will focus on the RESTful API and demonstrate how to scan paper documents to web pages using JavaScript and HTTP requests.
## Online Demo
[https://yushulx.me/web-twain-document-scan-management/examples/rest_api/](https://yushulx.me/web-twain-document-scan-management/examples/rest_api/)
## Prerequisites
- Install and run Dynamsoft Service.
- Windows: [Dynamsoft-Service-Setup.msi](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup.msi)
- macOS: [Dynamsoft-Service-Setup.pkg](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup.pkg)
- Linux:
- [Dynamsoft-Service-Setup.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup.deb)
- [Dynamsoft-Service-Setup-arm64.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup-arm64.deb)
- [Dynamsoft-Service-Setup-mips64el.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup-mips64el.deb)
- [Dynamsoft-Service-Setup.rpm](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamsoftServiceSetup.rpm)
- Obtain a [free trial license](https://www.dynamsoft.com/customer/license/trialLicense?product=dwt&source=codepool) for Dynamic Web TWAIN.
- Include [axios](https://www.npmjs.com/package/axios).
Axios is a promise-based HTTP client for the browser and Node.js. Since we have used it in a Node.js example, migrating the RESTful API calls to a web page is straightforward.
```html
<script src="https://unpkg.com/axios@1.6.7/dist/axios.min.js"></script>
```
## Step 1: Accessing Dynamic Web TWAIN REST API via HTTP and HTTPS
The Dynamsoft Service runs on default ports `18622` for HTTP and `18623` for HTTPS..
To construct the host URL for the RESTful API:
```javascript
const port = window.location.protocol === 'https:' ? 18623 : 18622;
const host = window.location.protocol + '//' + "127.0.0.1:" + port;
```
## Step 2: Enumerating Scanners
The endpoint `/DWTAPI/Scanners` is used to list all available scanners. The response is an array of objects, each containing the scanner's name and ID.
### Fetching Available Scanners
```javascript
async function getDevices(host, scannerType) {
devices = [];
let url = host + '/DWTAPI/Scanners'
if (scannerType != null) {
url += '?type=' + scannerType;
}
try {
let response = await axios.get(url)
.catch(error => {
console.log(error);
});
if (response.status == 200 && response.data.length > 0) {
console.log('\nAvailable scanners: ' + response.data.length);
return response.data;
}
} catch (error) {
console.log(error);
}
return [];
}
```
### Supported Scanner Protocol Types
The supported [scanner protocol types](https://www.dynamsoft.com/web-twain/docs/info/api/Dynamsoft_Enum.html#dynamsoftdwtenumdwt_devicetype) include:
- TWAIN
- SANE
- ICA
- WIA
- ESCL
### Example: Listing TWAIN Scanners in an HTML Select Element
**JavaScript**
```javascript
let queryDevicesButton = document.getElementById("query-devices-button");
queryDevicesButton.onclick = async () => {
let scannerType = ScannerType.TWAINSCANNER | ScannerType.TWAINX64SCANNER;
let devices = await getDevices(host, scannerType);
let select = document.getElementById("sources");
select.innerHTML = '';
for (let i = 0; i < devices.length; i++) {
let device = devices[i];
let option = document.createElement("option");
option.text = device['name'];
option.value = JSON.stringify(device);
select.add(option);
};
}
```
**HTML**
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Dynamsoft RESTful API Example</title>
<link rel="stylesheet" href="main.css">
<script src="https://unpkg.com/axios@1.6.7/dist/axios.min.js"></script>
</head>
<body>
<button id="query-devices-button">Get Devices</button>
<select id="sources"></select>
<script src="main.js"></script>
</body>
</html>
```
## Step 3: Scanning Documents
To scan documents, specify the license key, scanner information, and other [scan parameters](https://www.dynamsoft.com/web-twain/docs/info/api/Interfaces.html#DeviceConfiguration) in a JSON object, then post the data to the `/DWTAPI/ScanJobs` endpoint.
### Scan Document
```javascript
let parameters = {
license: license,
device: JSON.parse(device),
};
parameters.config = {
IfShowUI: false,
PixelType: 2,
//XferCount: 1,
//PageSize: 1,
Resolution: 200,
IfFeederEnabled: false, // Set to true if you want to scan multiple pages
IfDuplexEnabled: false,
};
let jobId = await scanDocument(host, parameters);
async function scanDocument(host, parameters, timeout = 30) {
let url = host + '/DWTAPI/ScanJobs?timeout=' + timeout;
try {
let response = await axios.post(url, parameters)
.catch(error => {
console.log('Error: ' + error);
});
let jobId = response.data;
if (response.status == 201) {
return jobId;
}
else {
console.log(response);
}
}
catch (error) {
console.log(error);
}
return '';
}
```
- The `timeout` parameter is optional. If the scanner does not respond within the specified time, the scan job will be canceled.
- The job ID is returned if the scan job is created successfully and can be used to retrieve the scanned images.
## Step 4: Obtaining the Scanned Images
Use the `/DWTAPI/ScanJobs/{jobId}/NextDocument` endpoint to retrieve the scanned images.
```javascript
let url = host + '/DWTAPI/ScanJobs/' + jobId + '/NextDocument';
const response = await axios({
method: 'GET',
url: url,
responseType: 'arraybuffer',
});
```
**Note**: Set the response type to `stream` in Node.js and `arraybuffer` in the browser.
To display the scanned document in a browser, create a `Blob` object from the array buffer and use the `URL.createObjectURL` method to generate a URL for an HTML image element.
```javascript
const arrayBuffer = response.data;
const blob = new Blob([arrayBuffer], { type: 'image/jpeg' });
const imageUrl = URL.createObjectURL(blob);
```
Repeat the request until the status code is not `200`. Store all scanned image URLs in an array and return them to the caller.
```javascript
async function getImages(host, jobId) {
let images = [];
let url = host + '/DWTAPI/ScanJobs/' + jobId + '/NextDocument';
console.log('Start downloading images......');
while (true) {
try {
const response = await axios({
method: 'GET',
url: url,
responseType: 'arraybuffer',
});
if (response.status == 200) {
const arrayBuffer = response.data;
const blob = new Blob([arrayBuffer], { type: 'image/jpeg' });
const imageUrl = URL.createObjectURL(blob);
images.push(imageUrl);
}
else {
console.log(response);
}
} catch (error) {
// console.error("Error downloading image:", error);
console.error('No more images.');
break;
}
}
return images;
}
```
Finally, you can display the scanned images as follows:
```javascript
<div class="row">
<div class="full-img">
<img id="document-image">
</div>
</div>
<div class="row">
<div class="thumb-bar" id="thumb-bar">
<div class="thumb-box" id="thumb-box">
</div>
</div>
</div>
<script>
let images = await getImages(host, jobId, 'images');
for (let i = 0; i < images.length; i++) {
let url = images[i];
let img = document.getElementById('document-image');
img.src = url;
data.push(url);
let option = document.createElement("option");
option.selected = true;
option.text = url;
option.value = url;
let thumbnails = document.getElementById("thumb-box");
let newImage = document.createElement('img');
newImage.setAttribute('src', url);
if (thumbnails != null) {
thumbnails.appendChild(newImage);
newImage.addEventListener('click', e => {
if (e != null && e.target != null) {
let target = e.target;
img.src = target.src;
}
});
}
}
</script>
```
## Source Code
[https://github.com/yushulx/web-twain-document-scan-management/tree/main/examples/rest_api](https://github.com/yushulx/web-twain-document-scan-management/tree/main/examples/rest_api) | yushulx |
1,891,966 | Adapting to DevOps: My Journey and Suggestions for Freshers | HERE | 0 | 2024-06-18T05:13:07 | https://dev.to/ujjwalkarn954/adapting-to-devops-my-journey-and-suggestions-for-freshers-jh6 | devops, aws, kubernetes, freshers | [HERE](https://ujjwalkarn954.github.io/article3.html) | ujjwalkarn954 |
1,891,965 | Full stack developer python|Python full stack course | PYTHON Full Stack Developer - (V CUBE) Ready to master Python Full Stack development. Look no... | 0 | 2024-06-18T05:11:56 | https://dev.to/mounika_vcube_f01a5a6264c/full-stack-developer-pythonpython-full-stack-course-4146 | python, pythonfullstackdeveloper, fullstack |
**PYTHON Full Stack Developer - (V CUBE)**
Ready to master Python Full Stack development. Look no further than V CUBE Software Solutions we offer Python Full Stack training in Hyderabad! Our comprehensive course covers everything from beginner to advanced levels, ensuring you become a proficient Python Full Stack developer.
At V CUBE Software Solutions, we are dedicated to providing the Best Python Full Stack training experience with placement assistance in Hyderabad. With our expert instructors, you will get excellent training in Python Full Stack with our highly skilled trainers and advanced facilities in Hyderabad. Our hands-on approach and real-world projects will equip you with the skills and confidence needed to excel in the field.
Located in the heart of Hyderabad, near Kukatpally/KPHB, V CUBE Software Solutions is one of the best institutes for Python Full Stack training(https://www.vcubesoftsolutions.com/python-full-stack-in-kphb/). Whether you prefer offline or online training, we've got you covered!
Don't wait any longer to kickstart your career in the Python Full Stack coaching center near you. Join us at V CUBE software solutions and unleash your potential! Enroll now and take the first step toward a rewarding tech career.
| mounika_vcube_f01a5a6264c |
1,891,964 | Data types in Python | Data types are one of the building blocks of python. And You can do a lot of things with data... | 27,589 | 2024-06-18T05:09:45 | https://dev.to/afraazahmed/data-types-in-python-573e | python, programming, beginners, tutorial | Data types are one of the building blocks of python.
And You can do a lot of things with data types!
_Fact: In python, all data types are implemented as an object._
A data type is like a specification of what kind of data we would like to store in memory and python has some built-in data types in these categories:
- Text type: str
- Numeric types: int, float, complex
- Sequence types: list, tuple, range
- Mapping type: dict
- Set types: set, frozenset
- Boolean type: bool
- Binary types: bytes, bytearray, memoryview
Now, let's demistify all these data types by using **type()** function to display the data type of the variable.
## Text type
###str
- **str** stands for _string_ in python used for storing text in python.
- Strings can be written either in single quotes or double qoutes in python, hence your choice.
Example:
Output:
```
Hello, world!
<class 'str'>
```
## Numeric types
### int
- **int** stands for integer used to store integers (positive and negative numbers).
Example:
Output:
```
4
<class 'int'>
```
## float
- **float** stands for floating-point numbers (decimal point numbers)
Example:
Output:
```
3.14
<class 'float'>
```
## complex
- Complex numbers have a real and imaginary part, which are each a floating point number.
- Complex numbers can be written in two forms:
- real + (imag)j
- complex(real, imag)
Example:
Output:
```
(5+10j)
<class 'complex'>
```
## Sequence types
### list
- A **list** is data type where you can store a collection of data
- A list can also contain different data types
- A list is _ordered_ and _changeable_ and _allows duplicate members_
Example:
Output:
```
['Captain America', 'Iron Man', 'Thor', 'Hulk', 'Black Widow', 'Hawkeye']
<class 'list'>
```
### tuple
- A **tuple** is data type where you can store a collection of data
- A tuple can also contain different data types
- A tuple is _ordered_ and _unchangeable_ and _allows duplicate members_
Example:
Output:
```
('Captain America', 'Iron Man', 'Thor', 'Hulk', 'Black Widow', 'Hawkeye')
<class 'tuple'>
```
### range
- The range type represents an immutable (unchangable) sequence of numbers
- Commonly used for looping a specific number of times in for loops.
Example:
Output:
```
range(0, 10)
<class 'range'>
```
## Mapping type
### dict
- **dict** stands for dictionary in python
- Dictionaries are used to store data values in key:value pairs
- A dictionary is a collection which is _unordered_, _changeable_ and _does not allow duplicates_
Example:
Output:
```
{'Learning': 'Programming', 'Language': 'Python', 'Day': 4}
<class 'dict'>
```
## Set types
### set
- A set is data type where you can store a collection of data
- A set can also contain different data types
- A set is unordered and _unindexed_ and _allows no duplicate members_
Example:
Output:
```
{'Black Widow', 'Iron Man', 'Thor', 'Hawkeye', 'Hulk', 'Captain America'}
<class 'set'>
```
### frozenset
- **frozenset** data type can be created by _frozenset()_ function
- The _frozenset()_ function accepts an iterable and returns an unchangeable frozenset object (which is like a set object, only unchangeable)
Example:
Output:
```
frozenset({'cherry', 'banana', 'apple'})
<class 'frozenset'>
```
## Boolean type
### bool
- **bool** stands for boolean in python
- Booleans represent one of two values: True or False
Example:
Output:
```
True
<class 'bool'>
False
<class 'bool'>
```
## Binary types
### bytes
- **bytes** data type can be created in two forms:
- _bytes()_ function
- prefix 'b'
Example:
Output:
```
b'hello'
<class 'bytes'>
b'Hello'
<class 'bytes'>
```
### bytearray
- **bytearray()** function returns a bytearray object
- It can convert objects into bytearray objects
Example:
Output:
```
bytearray(b'\x00\x00\x00\x00')
<class 'bytearray'>
```
### memoryview
- **memoryview()** function returns a memory view object from a specified object
Example:
Output:
```
<memory at 0x2b4f7a8a7408>
<class 'memoryview'>
```
**Note**
As you might have observed earlier, some data types can be also implemented using their constructors.
This same technique can also be applied to every data type.
Example:
Output:
```
Hello, World!
4
3.14
(5+10j)
['Captain America', 'Iron Man', 'Thor', 'Hulk', 'Black Widow', 'Hawkeye']
('Captain America', 'Iron Man', 'Thor', 'Hulk', 'Black Widow', 'Hawkeye')
range(0, 10)
{'Learning': 'Programming', 'Language': 'Python', 'Day': 4}
{'apple', 'cherry', 'banana'}
frozenset({'banana', 'cherry', 'apple'})
True
False
b'\x00\x00\x00\x00'
bytearray(b'\x00\x00\x00\x00')
<memory at 0x2b8346a29408>
```
### Best Resources
- [Python Blog Series](https://dev.to/afraazahmed/series/27589) : A Blog series where I will be learning and sharing my knowledge on each of the above topics.
- [Learn Python for Free, Get Hired, and (maybe) Change the World!](https://zerotomastery.io/blog/best-way-to-learn-python-for-free) : A detailed roadmap blog by Jayson Lennon (a Senior Software Engineer) with links to free resources.
- **Zero To Mastery Course** - [Complete Python Developer](https://zerotomastery.io/courses/learn-python/) : A comprehensive course by Andrei Neagoie (a Senior Developer) that covers all of the above topics.
**Who Am I?**
I’m Afraaz Ahmed, a Software Engineering Nerd who loves building Web Applications, now sharing my knowledge through Blogging during the busy time of my freelancing work life. Here’s the link to all of my socials categorized by platforms under one place: https://linktr.ee/afraazahmed
**Thank you** so much for reading my blog🙂. | afraazahmed |
1,891,963 | hpfs vs cephfs performance | In recent days, I conducted a performance test of HPFS. Under the same environment, I also deployed... | 0 | 2024-06-18T05:01:46 | https://dev.to/sy_z_5d0937c795107dd92526/hpfs-vs-cephfs-performance-153f | In recent days, I conducted a performance test of HPFS. Under the same environment, I also deployed CephFS and made a performance comparison. The test case was to open a file, write 4096 bytes, close it, then open it again, read 4096 bytes, and close it. This continuous operation was repeated to create a total of 100 million files of 4096K each, with multiple threads operating concurrently. The IOPS was measured from this test.
From this test data, we can see that HPFS performance increases linearly with the addition of clients. This is because the capability of a single client is limited by the bottleneck of FUSE. If HPFS's API interface is used, this limitation is completely removed, and the performance of all NVMe disks can be fully utilized.
On the other hand, CephFS is limited by the bottleneck of MDS, and its IOPS cannot increase even with the addition of more clients. HPFS, however, can continue to scale its metadata file system's IOPS load capacity by expanding the number of HPFS-SRV.
github url:
https://github.com/ptozys2/hpfs
For an introduction to HPFS, please refer to this article：
https://dev.to/sy_z_5d0937c795107dd92526/multi-meta-server-ceph-4pe1 | sy_z_5d0937c795107dd92526 | |
339,834 | The Last Project | My Final Project It's a blog which is developed using Javascript and Graphql Dem... | 0 | 2020-05-20T11:13:54 | https://dev.to/bearbobs/the-last-project-3452 | octograd2020, githubsdp |
## My Final Project
It's a blog which is developed using Javascript and Graphql
## Demo Link
https://www.escapades.works/
Thanks, #githubsdp for helping with the domain
service used: Name.com
## Link to Code
[Note]: # (Our markdown editor supports pretty embeds. If you're sharing a GitHub repo, try this syntax: `{% github link_to_your_repo %}`)
{% github https://github.com/Bearbobs/Blog %}
## How I built it (what's the stack? did I run into issues or discover something new along the way?)
It all started with a simple blog implementation using gatsby. I added some extra functionality like dark/light mode to provide a better outlook. Techstack is Javascript with Graphql.
In next rollout, I am adding options to comment and upvote posts, and according to these ratings ordering my posts. There will also be a timeline implementation of the post.
## Additional Thoughts / Feelings / Stories
I am happy to implement it, as I always thought of writing articles but was never committed enough to do the same. Now I can basically spin up some new articles while parallelly polishing my own platform.
[Final Note]: # (CONGRATULATIONS!!! You are amazing!) | bearbobs |
1,894,062 | Tutorial: Implementing Repository with GORM and SQLite | In the previous part of the series we created the required interface for you invoice... | 0 | 2024-06-19T20:30:10 | https://blog.gkomninos.com/tutorial-implementing-repository-with-gorm-and-sqlite | generalprogramming, golanguage, webdev, tutorial | ---
title: Tutorial: Implementing Repository with GORM and SQLite
published: true
date: 2024-06-18 05:00:47 UTC
tags: GeneralProgramming,GoLanguage,WebDevelopment,Tutorial
canonical_url: https://blog.gkomninos.com/tutorial-implementing-repository-with-gorm-and-sqlite
---
In the previous part of the series we created the required interface for you invoice generation/management web application. In this post we are going to provide and implementation of the CompanyRepository . In our requirements in the first part of th... | gosom |
1,891,962 | Exploring Authentication Providers in Next.js | In modern web applications, authentication is a fundamental requirement. Implementing robust... | 0 | 2024-06-18T04:52:29 | https://dev.to/vyan/exploring-authentication-providers-in-nextjs-4nh7 | webdev, beginners, react, nextjs | In modern web applications, authentication is a fundamental requirement. Implementing robust authentication can be complex, but Next.js makes it significantly easier by providing seamless integration with various authentication providers. In this blog, we'll explore some of the most popular authentication providers you can use with Next.js to secure your applications effectively.
## Why Use Authentication Providers?
Authentication providers simplify the process of securing your application by handling user login, registration, and session management. They offer built-in security features and often integrate with other services like social login (e.g., Google, Facebook) and multi-factor authentication.
### Benefits of Using Authentication Providers:
1. **Security**: Providers implement industry-standard security practices.
2. **Convenience**: Simplify user management and reduce development time.
3. **Scalability**: Easily handle authentication for a growing user base.
4. **Integration**: Support for social logins and third-party services.
## Popular Authentication Providers for Next.js
### 1.**NextAuth.js**
[NextAuth.js](https://next-auth.js.org/) is a complete open-source authentication solution for Next.js applications. It supports multiple authentication providers and comes with built-in security features.
#### Key Features:
- **Social Login**: Integrates with providers like Google, Facebook, GitHub, Twitter, and more.
- **Database Support**: Works with databases like MySQL, PostgreSQL, MongoDB, and more.
- **JWT**: Supports JSON Web Tokens for secure authentication.
- **Session Management**: Handles user sessions with ease.
#### Getting Started with NextAuth.js:
1.**Install NextAuth.js**:
```bash
npm install next-auth
```
2.**Configure NextAuth.js**:
Create a `[...nextauth].js` file in the `pages/api/auth` directory:
```javascript
import NextAuth from "next-auth";
import Providers from "next-auth/providers";
export default NextAuth({
providers: [
Providers.Google({
clientId: process.env.GOOGLE_CLIENT_ID,
clientSecret: process.env.GOOGLE_CLIENT_SECRET,
}),
// Add more providers here
],
// Optional: Customize pages, callbacks, etc.
});
```
3.**Add Environment Variables**:
Add your provider credentials to a `.env.local` file:
```env
GOOGLE_CLIENT_ID=your-client-id
GOOGLE_CLIENT_SECRET=your-client-secret
```
4.**Protect Pages**:
Use the `useSession` hook to protect pages or components:
```javascript
import { useSession, signIn, signOut } from "next-auth/client";
export default function HomePage() {
const [session, loading] = useSession();
if (loading) return <p>Loading...</p>;
if (!session) return <button onClick={signIn}>Sign in</button>;
return (
<>
<p>Welcome, {session.user.name}</p>
<button onClick={signOut}>Sign out</button>
</>
);
}
```
### 2.**Auth0**
[Auth0](https://auth0.com/) is a popular authentication and authorization platform that provides secure access for applications, devices, and users.
#### Key Features:
- **Universal Login**: Centralized login for all your applications.
- **Multi-Factor Authentication**: Adds an extra layer of security.
- **Social Logins**: Integrates with major social platforms.
- **Comprehensive Documentation**: Extensive guides and API references.
#### Getting Started with Auth0:
1.**Sign Up for Auth0**:
Create an account at [Auth0](https://auth0.com/).
2.**Install Auth0 SDK**:
```bash
npm install @auth0/nextjs-auth0
```
3.**Configure Auth0**:
Create an `auth` directory in the `pages/api` directory and add `[...auth0].js`:
```javascript
import { handleAuth } from '@auth0/nextjs-auth0';
export default handleAuth();
```
4.**Add Environment Variables**:
Add your Auth0 credentials to a `.env.local` file:
```env
AUTH0_DOMAIN=your-domain.auth0.com
AUTH0_CLIENT_ID=your-client-id
AUTH0_CLIENT_SECRET=your-client-secret
AUTH0_REDIRECT_URI=http://localhost:3000/api/auth/callback
AUTH0_POST_LOGOUT_REDIRECT_URI=http://localhost:3000
SESSION_COOKIE_SECRET=your-session-cookie-secret
```
5.**Protect Pages**:
Use the `withPageAuthRequired` function to protect pages:
```javascript
import { withPageAuthRequired } from '@auth0/nextjs-auth0';
function Dashboard({ user }) {
return <div>Welcome, {user.name}</div>;
}
export default withPageAuthRequired(Dashboard);
```
### 3.**Firebase Authentication**
[Firebase Authentication](https://firebase.google.com/products/auth) provides backend services for easy-to-use authentication using email and password, phone auth, and social providers like Google, Facebook, and Twitter.
#### Key Features:
- **Easy Integration**: Simple to set up and integrate.
- **Comprehensive SDKs**: Available for web, mobile, and server.
- **Secure**: Robust security practices.
- **Social Logins**: Supports multiple social authentication providers.
#### Getting Started with Firebase Authentication:
1.**Set Up Firebase Project**:
Create a Firebase project at [Firebase Console](https://console.firebase.google.com/).
2.**Install Firebase SDK**:
```bash
npm install firebase
```
3.**Configure Firebase**:
Create a `firebase.js` file in your project:
```javascript
import firebase from "firebase/app";
import "firebase/auth";
const firebaseConfig = {
apiKey: process.env.FIREBASE_API_KEY,
authDomain: process.env.FIREBASE_AUTH_DOMAIN,
projectId: process.env.FIREBASE_PROJECT_ID,
storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
appId: process.env.FIREBASE_APP_ID,
};
if (!firebase.apps.length) {
firebase.initializeApp(firebaseConfig);
}
export default firebase;
```
4.**Add Environment Variables**:
Add your Firebase credentials to a `.env.local` file:
```env
FIREBASE_API_KEY=your-api-key
FIREBASE_AUTH_DOMAIN=your-auth-domain
FIREBASE_PROJECT_ID=your-project-id
FIREBASE_STORAGE_BUCKET=your-storage-bucket
FIREBASE_MESSAGING_SENDER_ID=your-messaging-sender-id
FIREBASE_APP_ID=your-app-id
```
5.**Authenticate Users**:
Use Firebase methods to handle authentication in your components:
```javascript
import firebase from "../firebase";
const signIn = async () => {
const provider = new firebase.auth.GoogleAuthProvider();
await firebase.auth().signInWithPopup(provider);
};
const signOut = async () => {
await firebase.auth().signOut();
};
export default function HomePage() {
const [user, setUser] = React.useState(null);
React.useEffect(() => {
firebase.auth().onAuthStateChanged(setUser);
}, []);
if (!user) return <button onClick={signIn}>Sign in with Google</button>;
return (
<>
<p>Welcome, {user.displayName}</p>
<button onClick={signOut}>Sign out</button>
</>
);
}
```
### 4.**Clerk**
[Clerk](https://clerk.dev/) is an advanced user management and authentication platform that offers a complete suite of authentication features and developer tools.
#### Key Features:
- **User Management**: Complete user profiles and management tools.
- **Social and Passwordless Login**: Supports multiple social providers and passwordless authentication.
- **Built-in UI**: Prebuilt components for login, registration, and more.
- **Security**: Implements best security practices.
#### Getting Started with Clerk:
1.**Sign Up for Clerk**:
Create an account at [Clerk](https://clerk.dev/).
2.**Install Clerk SDK**:
```bash
npm install @clerk/clerk-sdk-node
```
3.**Configure Clerk**:
Add your Clerk credentials to a `.env.local` file:
```env
NEXT_PUBLIC_CLERK_FRONTEND_API=your-frontend-api
CLERK_API_KEY=your-api-key
```
4.**Initialize Clerk**:
Create a `_app.js` file and initialize Clerk:
```javascript
import { ClerkProvider } from '@clerk/clerk-sdk-react';
import { useRouter } from 'next/router';
const frontendApi = process.env.NEXT_PUBLIC_CLERK_FRONTEND_API;
function MyApp({ Component, pageProps }) {
const router = useRouter();
return (
<ClerkProvider frontendApi={frontendApi} navigate={(to) => router.push(to)}>
<Component {...pageProps} />
</ClerkProvider>
);
}
export default MyApp;
```
5.**Protect Pages**:
Use Clerk hooks to protect pages or components:
```javascript
import { useUser, withUser } from '@clerk/clerk-sdk-react';
function Dashboard() {
const { isLoaded, user } = useUser();
if (!isLoaded) return <p>Loading...</p>;
if (!user) return <p>You need to sign in</p>;
return <div>Welcome, {user.fullName}</div>;
}
export default withUser(Dashboard);
```
### 5.**Kinde**
[Kinde](https://kinde.com/) is an authentication platform designed to help businesses manage user authentication and authorization efficiently.
#### Key Features:
- **Team Management**: Manage teams and roles easily.
- **Single Sign-On (SSO)**: Supports SSO for enterprise applications.
- **Multi-Factor Authentication**: Adds an extra layer of security.
- **Scalable**: Designed to scale with your business needs.
#### Getting Started with Kinde:
1.**Sign Up for Kinde**:
Create an account at [Kinde](https://kinde.com/).
2.**Install Kinde SDK**:
```bash
npm install @kinde/kinde-auth-nextjs
```
3.**Configure Kinde**:
Add your Kinde credentials to a `.env.local` file:
```env
KINDE_DOMAIN=your-domain.kinde.com
KINDE_CLIENT_ID=your-client-id
KINDE_CLIENT_SECRET=your-client-secret
```
4.**Initialize Kinde**:
Create a `_app.js` file and initialize Kinde:
```javascript
import { KindeAuthProvider } from '@kinde/kinde-auth-nextjs';
function MyApp({ Component, pageProps }) {
return (
<KindeAuthProvider>
<Component {...pageProps} />
</KindeAuthProvider>
);
}
export default MyApp;
```
5.**Protect Pages**:
Use Kinde hooks to protect pages or components:
```javascript
import { useKindeAuth } from '@kinde/kinde-auth-nextjs';
function Dashboard() {
const { user, isAuthenticated, isLoading } = useKindeAuth();
if (isLoading) return <p>Loading...</p>;
if (!isAuthenticated) return <p>You need to sign in</p>;
return <div>Welcome, {user.name}</div>;
}
export default Dashboard;
```
## Conclusion
Choosing the right authentication provider for your Next.js application depends on your specific needs, such as ease of use, security requirements, and available features. NextAuth.js, Auth0, Firebase Authentication, Clerk, and Kinde are all excellent choices that offer robust solutions for implementing authentication in your applications. By leveraging these providers, you can ensure a secure and seamless authentication experience for your users while focusing on building the core features of your application. | vyan |
1,890,812 | 7 Ways AI is Transforming Cloud Computing | Cloud computing stands as a cornerstone for data management across industries. Combining artificial... | 0 | 2024-06-18T04:50:57 | https://dev.to/calsoftinc/7-ways-ai-is-transforming-cloud-computing-8cj | cloud, ai, cloudcomputing, machinelearning | Cloud computing stands as a cornerstone for data management across industries. Combining artificial intelligence (AI) with cloud technology revolutionizes data processing, decision-making, and security. AI enhances cloud capabilities by automating tasks, analyzing vast datasets, and bolstering cyber defenses. This combination maximizes the allocation of resources, promotes innovation, and complements user experiences. The symbiotic relationship between AI and cloud computing is essential for meeting cutting-edge technology issues and using long-term business enterprise growth. As businesses increasingly rely upon cloud solutions, the significance of AI integration becomes clear, shaping the future of technology and organizational success.
Here are seven key points highlighting how [**Artificial intelligence**](https://www.calsoft.ai/) is transforming cloud computing:
### Enhanced Data Management and Analysis:
Artificial intelligence enhances the efficient control and evaluation of large volumes of data stored inside the cloud. AI is capable of sifting through large datasets using machine learning algorithms to identify patterns, trends, and anomalies. This potential enables businesses to take advantage of significant insights and make data-driven decisions, ensuing increased operational performance and strategic planning.
### Improved Automation and Efficiency:
AI enhances cloud computing by automating both routine and complex tasks. AI-powered automation manages cloud resources, monitors performance, and optimizes workloads without human interaction. This not only lowers the possibility of human error, but also assures cloud services are delivered efficiently and consistently.
### Enhanced Security and Fraud Detection:
AI improves cloud security by enabling better threat detection and response capabilities. Machine mastering models can examine network traffic and user activity to detect potential security issues, which include illegal access or data breaches. AI systems can respond to threats by learning from fresh data constantly, making cloud environments more secure and more resilient o cyber-attacks.
### Optimized Customer Experience:
Artificial Intelligence improves consumer interactions and personalizes experiences to enhance cloud-based apps. AI may also assess client data to provide tailored services and recommendations, growing consumer loyalty and happiness. This capability is not limited to but particularly beneficial in banking, healthcare, and e-commerce sectors
### Accelerated Innovation and Business Growth:
The combination of AI and cloud computing complements innovation by enabling rapid creation and implementation of new applications and services. Artificial Intelligence (AI) offers the computational power and scalability needed to support creative projects, such as developing intelligent software, executing complex simulations, and trying out unique business plans. This speeds up the time it takes for new products and services to enter the market, promoting business growth and competitive advantage.
### Cost Optimization and Resource Management:
AI-driven analytics can optimize resource allocation in cloud environments, ensure cost savings, and increase efficiency. This is referred to as cost optimization and resource management. Artificial intelligence (AI) algorithms can evaluate the best configurations for cloud resources, such as processing power and storage capacity, by examining consumption patterns and performance indicators. By taking a proactive approach to resource management, businesses can maximize return on investment and prevent excessive costs by simply purchasing the resources they need.
### Data Privacy and Compliance:
AI is essential to maintaining compliance in cloud environments, especially as data privacy laws like the CCPA and GDPR come into sharper focus. Artificial intelligence (AI) systems can automatically classify sensitive material, ban access restrictions, and spot unauthorized activities. Additionally, AI-powered encryption methods can enhance data privacy and privacy while safeguarding private data stored on cloud storage systems.
## Conclusion
We cannot deny the fact that AI is transforming cloud computing at a rapid pace and in multiple ways. The seven points highlighted in our blog
demonstrate how AI enhances cloud environments` data management, automation, security, customer experiences, creativity, cost efficiency, and compliance. Together, they narrate how AI and cloud computing collaborate to drive business success and influence the trajectory of technology.
Calsoft is at the leading edge of the digital transformation sector, our expertise unlocks the revolutionary potential of artificial intelligence in [**cloud computing services**](https://www.calsoftinc.com/technology/cloud-engineering-solutions/). Our specialized services for AI integration enhance cloud capabilities, providing clients with the potential to take benefit of new perspectives and foster creativity. Calsoft helps organizations automate procedures, enhance data security, and provide individualized experiences by integrating AI into cloud solutions in a smooth way. By utilizing the promise of AI-driven cloud computing, our customized solution enables businesses to accelerate their journey to digital maturity. Businesses may embrace the future of AI-enhanced cloud computing for long-term growth and success by navigating the rapidly changing technological landscape with confidence when Calsoft is their strategic partner. | calsoftinc |
1,891,958 | Ultimate Guide: Creating and Publishing Your First React Component on NPM | In the ever-evolving world of software development, sharing reusable components can significantly... | 0 | 2024-06-18T04:46:04 | https://dev.to/futuristicgeeks/ultimate-guide-creating-and-publishing-your-first-react-component-on-npm-22dp | webdev, react, npm, javascript | In the ever-evolving world of software development, sharing reusable components can significantly enhance productivity and collaboration. One powerful way to contribute to the developer community is by publishing your own React components to NPM. This article provides a comprehensive, step-by-step guide to creating a React button component that supports different sizes and publishing it to NPM.
Publishing a React component to NPM allows you to share your work with developers worldwide, promote code reuse, and contribute to the open-source community. This guide will walk you through the process of creating a button component, setting up your project, writing the component, styling it, and publishing it to NPM.
Basic Fundamentals
Before diving into the tutorial, let’s briefly discuss some fundamental concepts:
- React: A JavaScript library for building user interfaces, especially single-page applications where data changes over time.
- NPM: The Node Package Manager, a package manager for JavaScript that allows developers to share and reuse code.
- Babel: A JavaScript compiler that allows you to use next-generation JavaScript, today.
- Component: In React, a component is a reusable piece of the UI. Components can be stateful or stateless.
Read Step-by-Step Guide here: https://futuristicgeeks.com/ultimate-guide-creating-and-publishing-your-first-react-component-on-npm/
| futuristicgeeks |
1,891,957 | A Complete Guide on Test Case Management [Tools & Types] | In this blog, we are gonna discuss everything you need to know about test case management and how you... | 0 | 2024-06-18T04:45:44 | https://dev.to/elle_richard_232/a-complete-guide-on-test-case-management-tools-types-5pk | softwaredevelopment, testing, case, management | In this blog, we are gonna discuss everything you need to know about test case management and how you can make test case management easy with the TestGrid.io automation tool.
**What Is Test Case Management?**
Test case management is the process of managing testing activities to ensure high-quality and end-to-end testing of software applications.
To deliver a high-quality software application, the method entails organizing, controlling, and ensuring traceability and visibility of the testing process. In addition, it ensures that the software testing process is continuous as per your plan.
### What are The Different Types of Test Cases?
**#01 Functionality Test Cases**
You may use the functionality test cases to determine whether or not an application’s interface communicates with the rest of the system and its users. The tests determine whether or not the software can perform the functions that you are expecting of it.
Cases are a type of black-box testing it uses the specifications or user stories of the software under test as its foundation. This enables the tests to continue even without requiring access to the workings or internal structures of the software under test. The QA team usually writes functionality test cases because the task falls within normal QA processes.
They can be written and executed as soon as development releases the first function for testing. If the tester only has access to the requirements, they can be written ahead of the code to help steer development.
As previously stated, they can be written and run as soon as it becomes feasible and should be repeated whenever updates are added, right up until customers become a possibility.
**#02 User Interface Test Cases**
User interface test cases are used to ensure that specific components of the Graphical User Interface (GUI) look and function correctly. You can also use these test cases to detect cosmetic inconsistencies, grammar and spelling errors, links, and any other elements with which the user interacts or sees.
The testing team typically writes these cases, but the inclusion of the design team may also take because they are more familiar with the interface. For example, user interface test cases are types of software testing test cases that typically drive cross-browser testing. Because browsers render things differently, user interface test cases help ensure that your application behaves consistently across multiple browsers.
**#03 Performance Test Cases**
Performance test cases validate an application’s response times and overall effectiveness. That is, how long does it take for the system to respond after acting? The success criteria for performance test cases should be very clear.
The testing team usually writes these test cases and is frequently automated. Hundreds of thousands of performance tests can be found in an extensive application. Automating and running these tests regularly helps expose scenarios where the application is not performing as expected.
Performance test cases aid in determining how the application will perform in practice. As the testing team receives performance requirements from the product team, these cases can be written. However, we can identify many performance issues manually even when no set conditions.
**#04 Usability Test Cases**
Usability test cases are known as “tasks” or “scenarios.” Rather than detailed step-by-step instructions for carrying out the test, the tester is given a high-level scenario or task to complete.
Usability test cases assist in determining how a user approaches and uses the application naturally. They help the tester in navigating various situations and flows. You don’t require any prior knowledge of the application.
The design team typically prepares these test cases in collaboration with the testing team. However, you must perform usability testing before performing user acceptance testing.
**#05 Security Test Cases**
Security test cases ensure that the application restricts actions and permissions as needed. These test cases are written to safeguard data when and where required.
Security test cases drive penetration testing and other security-based tests.
Authentication and encryption are frequently at the forefront of security test cases. The security team (if one exists) is usually in charge of writing and carrying out these tests.
**#06 Database Test Cases**
Database testing test cases Investigate what’s going on behind the scenes. The user interface is spotless, and everything appears to be in working order… But where is all that information going?
To write these test cases, you must thoroughly understand the entire application and the database tables and stored procedures. For example, the testing team frequently uses SQL queries to create database test cases.
Database tests are used to ensure that the code has been written to store and handle data consistently and safely.
**#07 Integration Test Cases**
Integration test cases are designed to determine how various modules interact. The primary goal of integration test cases is to ensure that the interfaces between the various modules are functional.
The testing team determines which areas should be subjected to integration testing, while the development team provides feedback on how the test cases should be written. Either of these two teams could report the issues.
They ensure that modules that are already working independently can also work together.
### How To Prepare Test Cases?
**#01 Use a Strong Title and Description**
A strong title is the foundation of a good test case. As a best practice, name the test case along the same lines as the tested module.
For instance, if you’re trying the login page, include “Login Page” in the test case title; also, have a unique identifier in the test case’s header so that the identifier can be referenced instead of a long writing title.
The description should inform the tester of what they will test. At times, other relevant information, such as the test environment, test data, and preconditions, may be included in this section. The description should be easy to read and should communicate the high-level goal of the test right away.
**#02 Make it Reusable**
A good test case is reusable and adds value to the software testing team in the long run. Keep this in mind when creating a test case. You can save time in the long run by reusing the test case rather than rewriting it.
**#03 Include the Expected Result**
The expected result informs the tester of what to expect from the test steps. This is how the tester determines whether the test case “passes” or “fails.”
**#04 Keep the Test Steps Clear**
Simple test cases should be used, and test cases should be written by keeping in mind that the person who registers the test case may not be the same person who runs the test. The test steps should include all of the necessary data and instructions on how to run the test. These are essential aspects of a test case. Keep this section brief and to the point, but don’t leave any important information. Instead, create the test case so that anyone can perform it.
**#05 Include Assumptions and Preconditions**
Include assumptions that apply to the test and execute any preconditions before the test can be. This information may include which page the user should begin the trial on, test environment dependencies, and any special setup requirements that we need to complete before running the test. This information also aids in keeping the test steps brief and to the point.
### How Do You Manage Test Cases in Automation?
**#01 Plan Your Test Cases and Test Suites**
Before beginning test automation, the vital thing to do is plan your test cases and test suites. Beginning test automation without proper test case planning can result in uncertainty and unexpected results due to a lack of correct steps and test scenarios.
The planning of test cases and test suites are also essential for managing test assets for future use. When test plans are communicated to developers, it aids in prioritizing development and testing efforts in the right direction, eliminating unnecessary and less important processes.
**#02 Differentiate Test Objects**
Differentiate between good and bad test objects for successful test automation projects. This will allow you to run tests more quickly, improve the testing process, and reduce costs and time spent on test design.
On the other hand, it will assist you in eliminating repetitive test execution, allowing you to spend more time on test design, driving repeatability of [regression tests](https://testgrid.io/blog/regression-testing-complete-guide/), and achieving better test coverage for good tests.
**#03 Centralise Your Test Assets**
It is also critical to centralize your test assets through a common repository for faster and smoother access to manage your automated test projects effectively. Centralization of test assets will help you eliminate the overheads of distributed resources while also allowing you to share resources with development teams. You can also use centralization to organize your test assets to retain their integrity and reusability for future projects.
**#04 Validate and Remove Outdated Test Cases**
Applications change over time to accommodate future requirements, which means you must validate and modify test cases to meet these requirements. Validity checks performed after each release or software update will also assist you in keeping your tests compatible.
In addition, test cases that are no longer compatible with the application must be removed. This will lower the cost of managing obsolete and unnecessary test cases while also simplifying future test executions.
**#05 Separate Test Architecture**
Finally, keep your test architecture and libraries separate from your test automation tool. This will allow you to manage and document test cases clearly and efficiently with minimal effort. Separating the test architecture from the tool will also ensure reusability across projects, tools, and environments.
Consider all of the above test automation best practices to improve the effectiveness of your test automation management process. Please do so if you want to share anything about test management or automation.
### Features of Test Case Management Tool
**#01 Improve Software Quality**
Every software development company works for a better software quality goal: to create and deliver software that completely meets the tastes and preferences of its customers.
Test management tools help testers greatly because they tell us exactly where the bug is, how certain features work, and where a little extra finesse is required.
Therefore, it is highly recommended that software goes through a test management tool to assess its quality and efficiency.
**#02 Scalable Environment**
Like any other avenue, software development must scale and improve its functions in accordance with market trends. For this to happen in the future, things must get moving in the backend to ensure users have a positive experience.
Test management tools, such as QA touch, provide expanding options such as unlimited test cases, unlimited test runs, unlimited project inclusion, and can accommodate more than 50 users, resulting in a scalable environment and a constant window of scope.
**#03 Secure Testing Data**
There is no doubt about the security of the data processed with a test management tool. It will, indeed. Because of the ability to manage users and role-based access in sync, only a select few who have access card will view the data stored in the cloud.
Especially in data scams, test management tools secure data by utilizing the appropriate technological aspects.
**#04 Reduction In Repetitive Work**
Work repetition can be very challenging. Most of the time, this occurs when one employee is unaware that another employee is working on resolving the issues. The use of a test management tool aids in the reduction of repetitive work.
For example, when the tools detect a bug, it automatically redirects it to the tester, developer, and anyone else who is working in the process. When this occurs, there should be no duplication of the same work, saving time and effort for employees.
**#05 Increases Team Productivity**
Productivity is important because it contributes to increased output, increased sales, improved team morale, and many other benefits. Real change occurs only when the entire team is in sync with creating things rather than just reacting to tasks and issues.
Test management tools rely less on human resources and more on automation, freeing up time for the entire team to focus on goals and increase productivity.
3 Person Illustration showing test case management
**#06 Integration With Testing Platforms**
Test management tools are well-designed to adapt and integrate with various other platforms. For example, to deliver better test results, issue trackers run quality test cases, aid in bug detection, and various other benefits.
With newer market developments and well-known industry players such as Slack, GitHub, Rally, Trac, and others, finding the right fit to collaborate for proper integration
**#07 Identify Bugs**
Bugs can be both annoying and destructive. Regardless of the amount of time spent on testing and development, bugs can creep in during software development. With test management tools, identifying bugs is simplified.
As a result, testers can do it quickly without spending more time locating the issue, allowing developers to fix it on time.
**#08 AI Text Prediction**
Only a few companies in the world of QA are delivering on this powerful feature of AI Text Prediction. QA touch, for example, has an AI feature that allows the QA team to reduce their effort and time in writing test cases by predicting text as they type.
### What Should I Look For in a Test Case Management Tool?
**#01 Cost**
First, select some tools from a list of all available tools based on your project budget. Using a commercial tool in a large organization is a good option if the budget allows it because it is simple to use and maintain.
Then it would be best if you decided how much you are willing to pay for licensing. You can easily determine by the time frame you require the tool. Many commercial tools also include a customized license in which you pay based on the features and duration of use that you choose.
**#02 Easy To Adopt**
You can determine the success of any test management tool by how quickly and easily you and other users in your organization can adopt it. Some critical points to consider here are the training options available while you are just starting and the tool’s ease of use.
Another factor that facilitates adoption is the availability of integrations with other tools, which means you do not have to spend time developing custom integrations.
**#03 Multiple User Support**
One of the primary reasons for moving away from Excel as a test management platform is the ability for multiple users to collaborate. However, tracking and security challenges arise when multiple users access the tool.
For example., one of the most important things to look for is whether the test management tool locks a specific test case when accessed so that two people cannot edit it simultaneously.
**#04 Productivity**
Throughout the testing process, the tool should provide detailed and valuable information.
The tool’s test report should be able to tell you exactly where the test failed, saving you time in tracing and replicating the issue.
Furthermore, the tool should be capable of documenting testing strategies, maintaining test case versions, logging defects, linking user stories, planning test execution, and uploading videos/images.
The tool should track and update the list of application modules on which the tests are running and released reliably. It should also provide a repository that represents a single version of the truth to all stakeholders, ensuring that there are no requirements conflicts.
Most projects these days use the agile methodology, so the tool you choose should support it as well. For example, it helps user stories creation, sprints, scrum, velocity charts, reports, and so on.
**#05 Support And Training**
Many test management tools have appealing features and benefits, but they appear to lag in proper Support.
Training test management tools and journey, training, and Support are equally important. For example, should they provide training guidance like videos or some guides? Will their Support guide you through specific features of their test management tool that will assist you in making better decisions?
Support is also essential when migrating from a legacy or comparable test management tool. For example, Timely support and training can make or break your test management journey.
**#06 Integration Support**
The quality assurance ecosystem is completely changing by test automation. It assists teams in shifting left by running tests throughout the development cycle. In addition, it enables continuous testing or testing at each CI/CD pipeline stage.
Because of the growing importance of test automation, you really need a test management tool that can easily integrate with automation tools and other CI/CD Tools.
Make sure the tool you choose can manage test scripts both locally and on the host, as well as store test automation results.
If the tool supports Continuous Integration, the tests will automatically launch in response to predefined triggers such as commits and scheduled tasks.
Today, most teams use bug-tracking tools such as Jira, Bugzilla, Mantis, etc. Check to see if the tools you’ve shortlisted integrate with these bug-tracking apps or other SDLC apps.
The benefit of such integration is that users can easily link bugs to test case runs and gain advanced traceability.
Based on your requirements, you can establish an integration benchmark. For example, if you want the test management tool to support a variety of DevOps tools in your pipelines, such as version control tools, continuous integration tools, continuous testing and deployment tools, and monitoring applications.
Many modern test management tools have open APIs that you can use for customer support and integration. This allows you to programmatically perform any task and integrate your test repository with other tools or in-house systems.
**#07 Quality Analytics**
Quality analytics and test reports provide Agile teams with actionable insights into project status and product readiness for go-to-market.
The tool you choose must have a sophisticated reporting function.
For example, the ability to generate a demand report. For example, a project team leader would like a report that shows the number of test cases executed per release or Defect by status for multiple projects. The best test management software provides user-defined custom reports in which users input the criteria for data generation.
Advanced reports provide agile teams with the desired customizations and flexibility in generating reports based on their data visualization requirements. For example, technical users may require a tool that supports SQL queries to create specific reports and features to obtain the desired information quickly
### Conclusion
A QA organization’s backbone is test case management. To release software efficiently and confidently, you need robust and trusted test cases, whether the goal is to validate feature functionality or to ensure regressions do not slip through to end-users.
Many businesses find it challenging to create, maintain, and execute a robust library of high-quality test case suites. These teams frequently suffer from poor quality, coverage gaps, release bottlenecks, and missed opportunities to add value through testing.
**Source:** _This blog was originally posted on [Testgrid](https://testgrid.io/blog/test-case-management-software-testing-guide/)._ | elle_richard_232 |
1,891,956 | Here is The Resume that got $450,000 job at Google | I watched a YouTube video called "The Resume that got me $450,000 job at Google," and it was very... | 0 | 2024-06-18T04:45:29 | https://dev.to/harryholland/here-is-the-resume-that-got-450000-job-at-google-15p2 | webdev, beginners, tutorial, productivity | {% youtube Z5CmnAM1t40 %}
I watched a YouTube video called "The Resume that got me $450,000 job at Google," and it was very helpful. The video explained how to make a great resume that can catch the attention of big tech companies. Here are the main points I learned:
1. Show Results: Highlight achievements with numbers to show your impact.
2. Match the Job: Use the same keywords and skills to tailor your resume to fit the job description.
3. Be Clear and Short: Organize your resume so it's easy to read and keep it concise.
4. Grab Attention: Write a strong summary at the top to catch the recruiter's eye.
The video's advice and examples can improve your resume and help you stand out in a tough job market.
| harryholland |
1,891,955 | Top 10 Web3 Grants You Should Know About | The cryptocurrency landscape has witnessed remarkable growth in recent years, attracting diverse... | 0 | 2024-06-18T04:44:13 | https://blog.learnhub.africa/2024/06/18/top-10-web3-grants-you-should-know-about/ | web3, cryptocurrency, blockchain, career | The cryptocurrency landscape has witnessed remarkable growth in recent years, attracting diverse users and investors. However, a pressing need has emerged as the industry evolves: developing user-friendly applications that can bridge the gap between cutting-edge blockchain technology and mainstream adoption.
To address this challenge, a wave of grant programs has swept across the Web3 ecosystem, providing crucial support to ambitious projects to build more accessible and intuitive solutions. These initiatives recognize the importance of fostering innovation across various domains, from decentralized finance (DeFi) and gaming (GameFi) to infrastructure development.
Grant programs have become vital launchpads, offering financial resources, invaluable mentorship, marketing opportunities, and connections with industry leaders. By empowering visionary developers and entrepreneurs, these grants pave the way for a future where blockchain-based applications are seamlessly integrated into our daily lives.
As the demand for user-friendly crypto experiences grows, various grant programs have emerged to support innovative ideas across different fields. These initiatives fuel the development of groundbreaking applications, nurture the growth of entire ecosystems, foster collaboration, and drive mainstream adoption.
Do you know [Web3 Decentralization Can Dismantle Big Tech Monopolies in 2024](https://blog.learnhub.africa/2024/02/14/how-web3-decentralization-can-dismantle-big-tech-monopolies-in-2024/)? It was a shock to us as well.
This guide spotlights 10 prominent grant programs that ambitious Web3 developers and entrepreneurs should consider. From blockchain infrastructure to DeFi, GameFi, and beyond, these initiatives cover various domains and offer varying levels of funding and support.
Whether you're a solo developer or a startup team, securing a grant could be the catalyst that propels your project into the spotlight. Let's explore the opportunities:
## Vara's Gear Foundation Grants Program
The Gear Foundation nurtures the Vara Network ecosystem through its grants program. It funds various Web3 projects spanning DeFi, GameFi, infrastructure development, and more. In addition to financial aid, recipients access strategic guidance and other intangible resources.
- **Application**
- Provide details on how your project contributes to the Vara ecosystem, typically by augmenting users or unlocking new use cases.
- E.g, increased network/network operator adoption, dApp development and integrations, community engagement
- Grants are milestone-based. Applications should include suggested milestones for funding.
Click [here](https://vara.network/grants) to get started.
## COTI Builders Program
COTI's recently launched grant program targets emerging projects in the DeFi and privacy spheres. Aiming to bolster its Layer 2 Ethereum ecosystem, COTI offers grants from $1,000 to $100,000 alongside technical support, marketing campaigns, partnership opportunities, and educational resources.
## Projects We Seek to Fund
We welcome a diverse range of applicants but are particularly interested in the following categories:
- Developer tooling, SDKs, and existing SDK improvements
- Infrastructure improvements such as bridges and network optimization tools
- Privacy-preserving decentralized applications (dApps)
- Privacy focused research and development that prove or highlight real-world use cases
- Efforts to expand the reach and understanding of COTI through educational content, community engagement, and developer support
- Protocols and tools with unique privacy features or needs
- Services that leverage COTI’s privacy capabilities
- Service integrations (SIs) that enable developers, products, services, and originators to work with or build on COTI
- Financial applications such as decentralized exchanges, lending and borrowing platforms, and NFT marketplaces
- RWA and enterprise integrations, applications, and their enablers
## **Who Can Apply**
The COTI Builders Program is open to most individuals and entities who are looking to support the growth of:
- The COTI V2 network and ecosystem
- Advancements and adoption of real-world privacy solutions and use cases on blockchain
Get started [here](https://cotinetwork.notion.site/Overview-COTI-Builders-Program-f742a22ff8ef4e648935362b9b4a9c34)
## EOS Network Foundation Grant Framework
The EOS Network Foundation provides grants ranging from $10,000 to $200,000 for open-source projects to foster EOS blockchain growth. The framework includes categories for new project proposals, maintenance grants for reviving existing tools/SDKs, and responses to specific proposal requests (RFPs).
Do you know that there are so many things you dont know about [Web3 Vs Web2: The Untold Lies of Blockchain Technology](https://blog.learnhub.africa/2024/02/08/web3-vs-web2-the-untold-lies-of-blockchain-technology/)
## Which projects can apply for direct grants?
There are three types of grants that the ENF considers.
- **New Proposal:** These projects are initiated by community members and range from core chain enhancements, SDKs, tools, and applications.
- **Maintenance Grant:** The community can also initiate maintenance grants to bring back support for a library, SDK, or tool that has fallen out of maintenance.
- **RFP Response**: From time to time, the ENF will propose a work request to the community as an RFP. All community members, teams and companies are welcome to apply to the RFP.
**In all cases, all projects must meet the following minimum requirements.**
- All code produced as part of a grant must be open-sourced and not rely on closed-source software for full functionality.
- MIT Projects given priority, but Apache 2.0, GPLv3, or Unlicense are also acceptable.
- Grants are not awarded for projects that have been the object of a successful token sale.
- Grant deliverables must contribute to the EOS network first and foremost.
- As a general rule, teams are asked to finish a grant before applying for another one.
- Projects that actively encourage gambling, illicit trade, money laundering or criminal activities will be rejected.
- All projects are required to create documentation that explains how their project works.
- At a minimum, written documentation is required for funding.
Get started [here](https://eosnetwork.com/blog/eos-network-foundation-grant-framework-guidelines/)
## DOT Grants Program
The Web3 Foundation has allocated $20 million and 5 million DOT tokens for grants to innovative projects within the Polkadot ecosystem. This unparalleled opportunity empowers developers to build on the cutting-edge modular blockchain network.
## How to apply:
1. Please read the FAQs, category guidelines, announcement guidelines, and Terms & Conditions to familiarize yourself with the subtleties of grants, applications, and the program.
2. [Fork](https://github.com/w3f/Grants-Program/fork) our grants program repository.
3. In the newly created fork, create a copy of the [application template](https://github.com/w3f/Grants-Program/blob/master/applications/application-template.md). If you're using the GitHub web interface, you will need to create a new file and copy the [contents](https://raw.githubusercontent.com/w3f/Grants-Program/master/applications/application-template.md) of the template inside the new one. Make sure you **do not modify the template file directly**. In the case of a maintenance application, use the [maintenance template](https://github.com/w3f/Grants-Program/blob/master/maintenance/maintenance-template.md) instead.
4. Name the new file after your project: `project_name.md`.
5. Fill out the template with the details of your project. The more information you provide, the faster the review. Please refer to our [Grant guidelines for most popular grant categories](https://grants.web3.foundation/docs/Support%20Docs/grant_guidelines_per_category) and make sure your deliverables present a similar level of detail. To get an idea of what a strong application looks like, you can have a look at the following examples: [1](https://github.com/w3f/Grants-Program/blob/master/applications/project_aurras_mvp_phase_1.md), [2](https://github.com/w3f/Grants-Program/blob/master/applications/project_bodhi.md), [3](https://github.com/w3f/Grants-Program/blob/master/applications/pontem.md), [4](https://github.com/w3f/Grants-Program/blob/master/applications/spartan_poc_consensus_module.md). Naturally, if you're only applying for a smaller grant consisting of UI work, you don't need to provide as much detail.
6. Once you're done, create a pull request. The pull request should only contain *one new file*—the Markdown file you created from the template.
7. You will see a comment template that contains a checklist. Once the pull request has been created, you can leave it as is and tick the checkboxes. Please read through these items and check all of them.
8. Sign off on the [terms and conditions](https://grants.web3.foundation/docs/Support%20Docs/T&Cs) presented by the [CLA assistant](https://github.com/claassistantio) bot as a Contributor License Agreement. You might need to reload the pull request to see its comment.
Get started [here](https://wiki.polkadot.network/docs/grants?ref=hackernoon.com)
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## Pyth Ecosystem Grants Program
Pyth Network, a leading Oracle solution provider, has allocated 50 million PYTH tokens for its grant program. The categories include Developer Grants for tools/integrations, Community Grants for events/content, and Research Grants to enhance the Oracle system's efficiency.
The Pyth grant program has three categories: community, research, and developer grants.
## How to ***Apply***
**Community Grants**
Community Grants are distributed to community members in the Pyth Network [social channels](https://pyth.network/community) who make educational, fun, or entertaining contributions, as determined by official community leaders.
The Community Grants program runs in 40-day cycles and operates as follows:
- Pyth Data Association has recognized several community leaders—[Chirons](https://en.wikipedia.org/wiki/Chiron) in the [Pyth Discord](https://discord.com/invite/PythNetwork)—to facilitate the issuing of grants.
- These community leaders are empowered by Pyth Data Association to issue grants for any contributions they encounter on the Pyth Network social channels.
- Community grants are distributed through the Discord and linked to a community member’s handle. The Discord also houses a comprehensive record of issued grants.
- Community grants are denominated in Impact Awards, which can be exchanged for PYTH on a 1:1 basis (plus multipliers based on earned Discord roles) every term.
For more information, please see the Impact Awards channel in the Discord.
**Research Grants**
Research grants come in the form of **bounties** in the Superteam Earn program. Bounties are typically structured as follows:
- Research topic and scope
- Conditions or additional requirements
- Deadline (if applicable)
- Reward structure
Anyone can take on the Research bounties listed in the Pyth Network page on Superteam Earn. Please carefully read the submission requirements and details of each bounty. Rewards for successful submissions are delivered through the Superteam platform.
**Application Review**
All submissions are reviewed on a rolling basis.
Reviews typically take between 1-3 weeks, depending on the bounty.
**Decision and Contact**
If your submission is successful, you will be emailed instructions on how to receive your bounty rewards.
**Developer Grants**
Research grants come in the form of **bounties** in the Superteam Earn program. Bounties are typically structured as follows:
- Project scope
- Conditions or additional requirements
- Deadline (if applicable)
- Reward structure
Anyone can take on the Research bounties listed on the Pyth Network page on Superteam Earn. Please carefully read the submission requirements and details of each bounty. Rewards for successful submissions are delivered through the Superteam platform.
**Application Review**
All submissions are reviewed on a rolling basis.
Reviews typically take between 2-8 weeks, depending on the bounty.
**Decision and Contact**
If your submission is successful, you will be emailed instructions on how to receive your bounty rewards.
Get started [here](https://pyth.network/grants)
## Astar Studio: Developer Console with $200K Grants
Astar Network has unveiled the Astar Studio Credit Grant, a $200,000 program to accelerate the adoption of its Developer Console marketplace solutions. Grantees also enjoy discounted fees on Astar's offerings.
The grant is awarded as credit, not cash or token equivalent, and will be used to purchase any developer tools within Astar Studio. Astar Network and Sequence will jointly select the grant recipients and the amount of credit granted for each project.
Grant recipient projects must utilize one or more marketplace solutions within Astar Studio, specifically the marketplace API or the white-label browser marketplace. These solutions will feature lower marketplace fees than standard marketplace fees for grant recipient projects.
Get started [here](https://astar.network/blog/launching-astar-studio-a-developer-console-with-a-200-k-grant-program-24)
## Stacks Grant Programs
Stacks offers a suite of grant initiatives to bolster the Bitcoin ecosystem, including Critical Bounties for infrastructure development, DeGrants for community-driven funding, Chapters for local engagement, and a Residency Program for long-term research projects, which include
- [Critical Bounties](https://github.com/stacksgov/Stacks-Grant-Launchpad/issues)
Critical Bounties fund infrastructure development, tools, research & other initiatives that drive Bitcoin layer development.
Although this category is closed, it will likely open in the coming month, so keep an eye out for it.
- [DeGrants](https://degrants.xyz/)
DeGrants is a community-led initiative in which community members dole out grants for efforts they deem important or interesting and that fall outside the scope of Critical Bounties.
- [Chapters](mailto:community@stacks.org)
Chapters are local community groups driving activation in a specific geography. Support for chapters is a collaborative effort between the Stacks Foundation team & local leaders.
- [Residents](https://github.com/stacksgov/residence-program)
The Residency Program fuels subject matter experts for open-ended research, experimentation, & other long-term projects.
Get started [here](https://stacks.org/grants)
## Tezos Foundation's Grant Program
The Tezos Foundation supports projects aligned with its research areas, such as advancements in banking ecosystems, developer tools, user-centric applications, privacy, and security initiatives.
## Areas of Interest
- **Baking**
Tezos has a growing number of bakers in its ecosystem that help secure the network by signing and publishing blocks. Our goal is to empower bakers by supporting the development of standardized tools, tutorials, and cloud applications.
[Proposal target list](https://tezos.foundation/area-of-interest/baking/)
- **Developer Experience**
The aim is to make it easy for Tezos to build on and onboard new developers to the ecosystem. To this end, they are looking to support tools, tutorials, and documentation to improve the user experience for all Tezos developers.
[Proposal target list](https://tezos.foundation/area-of-interest/developer-experience/)
- **Education and Training**
Tezos's growth and success are heavily linked to the community. To grow and support the community, we want to enable all ecosystem members worldwide.
[Proposal target list](https://tezos.foundation/area-of-interest/education-and-training/)
- **End-User Applications**
Tezos enables new types of applications, which can address problems that have been traditionally difficult to solve using legacy software stacks. We want to support new applications that drive wide adoption and benefit standardization, censorship resistance, or user control on the Tezos protocol.
[Proposal target list](https://tezos.foundation/area-of-interest/end-user-applications/)
- **Privacy**
Censorship resistance is key for all developments on Tezos. Our goal is to support research and development of infrastructure to build on Tezos’ strengths and enhance privacy-preserving solutions.
[Proposal target list](https://tezos.foundation/area-of-interest/privacy/)
- **Security**
Tezos has the assurance required for high-value use cases and a focus on formal methods. Given this strength, we aim to support projects building security solutions for Tezos.
[Proposal target list](https://tezos.foundation/area-of-interest/security/)
Get started [here](https://tezos.foundation/grants/)
## Cronos Ecosystem Programs
Cronos Labs offers grants (typically $10,000 - $50,000) for infrastructure, tools, product integration, and educational projects driving mainstream Web3 adoption. Grantees also receive technical and marketing assistance and opportunities for incubation and acceleration.
Get started [here](https://cronoslabs.org/programs)
## BNB Chain Builder Grant
BNB Chain's grant program emphasizes open-source frameworks, developer tools, infrastructure components, and compatibility modules serving the public good. Grant sizes are determined by project scope and roadmap.
## Who Should Apply?
We support free and open-source projects that want to impact the BNB Chain ecosystem and its community.
- Open Source Frameworks
- Free Developer Tooling
- BNB Chain Compatibility Modules
- Other Developer Tooling and Infrastructure
Get started [here](https://www.bnbchain.org/en/developers/developer-programs/builder-grant)
## Stellar Community Fund (SCF)
The newly launched SCF is a community-powered program supporting developers building on the Stellar network and its Soroban smart contracts platform. Key focus areas include DeFi innovation, solutions with real-world impact, and ecosystem infrastructure.
## Award Process
Once you have a plan for your Stellar and/or Soroban project, create a submission for an SCF Activation Award (up to $50K worth of XLM*) to prove your intent. After you’ve finished your deliverables of the Activation Award, you can submit your project to receive a larger Community Award (up to $100K worth of XLM*). Submission deadlines are every four weeks.
Get started [here](https://communityfund.stellar.org/)
## Conclusion
Securing a grant from these leading initiatives can provide your Web3 project with the critical early-stage funding, mentorship, exposure, and connections needed to thrive in this rapidly evolving space.
Review each program's eligibility criteria, application processes, and focus areas to get started. Craft a compelling proposal highlighting your project's potential impact, technical expertise, and long-term vision. Additionally, engage with the respective communities, attend events, and network to increase your chances of success.
The opportunities are vast, and the time to act is now. Explore these top grant programs today and unlock the resources to bring your groundbreaking Web3 idea to fruition.
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| scofieldidehen |
1,891,954 | .gitkeep vs .gitignore | Here is a concise summary of the key differences between .gitkeep and .gitignore : .gitkeep is used... | 0 | 2024-06-18T04:43:30 | https://dev.to/bksh01/gitkeep-vs-gitignore-2poo | webdev, git, development, programming | Here is a concise summary of the key differences between .gitkeep and .gitignore :
**.gitkeep** is used to track an otherwise empty directory in a Git repository, as Git does not automatically track empty directories. It is an unofficial convention, and the filename can be anything, as long as it is not ignored by the .gitignore file.
On the other hand, **.gitignore** is an official Git feature that specifies which files and directories should be ignored by Git. It is used to prevent certain files, like logs or compiled binaries, from being tracked in the repository.
The main differences are:
1. .gitkeep is used to track empty directories, while .gitignore is used to ignore specific files and directories.
2. .gitkeep is an unofficial convention, while .gitignore is an official Git feature.
3. The filename for .gitkeep can be anything, while .gitignore follows a specific syntax.
4. .gitignore is the preferred way to track empty directories, by adding a rule like "!directory/.gitkeep" to include the .gitkeep file. | bksh01 |
1,891,953 | Text-Encryption-Decryption String | In an era where data breaches and cyber threats are on the rise, securing sensitive information has... | 0 | 2024-06-18T04:43:12 | https://dev.to/goyani_tushar_65a0484c05a/text-encryption-decryption-string-4lpp | In an era where data breaches and cyber threats are on the rise, securing sensitive information has never been more critical. Text encryption and decryption play a vital role in protecting data from unauthorized access. At [ConvertTools](https://converttools.app/text-encryption-decryption), we provide a comprehensive tool that simplifies the process of encrypting and decrypting text, ensuring your communications remain secure.
### Why Encryption and Decryption are Essential
Encryption converts plain text into a coded format, making it unreadable to anyone who does not have the decryption key. This process is crucial for:
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- **Secure Communication**: Safeguards messages and emails from interception.
- **Data Integrity**: Prevents unauthorized alterations to the information.
### How Our Text Encryption/Decryption Tool Works
Our tool is designed to be user-friendly while offering robust security features:
1. **Enter Text**: Paste or type your text into the input box.
2. **Choose Encryption/Decryption**: Select whether you want to encrypt or decrypt the text.
3. **Generate Key**: Optionally, generate a unique encryption key.
4. **Process**: Click the button to encrypt or decrypt your text.
### Key Features
- **Multiple Algorithms**: Supports popular encryption algorithms like AES, DES, and RSA.
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At [ConvertTools](https://converttools.app/text-encryption-decryption), we are committed to providing tools that enhance your data security. Try our encryption/decryption tool today and experience a new level of security for your communications.
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1,891,952 | Urinary Catheters Market Analysis 2024-2033: Size, Share, and Latest Industry Developments | The global urinary catheters market, valued at approximately US$ 1.9 billion in 2023, is anticipated... | 0 | 2024-06-18T04:43:09 | https://dev.to/swara_353df25d291824ff9ee/urinary-catheters-market-analysis-2024-2033-size-share-and-latest-industry-developments-39df | The global [urinary catheters market](https://www.persistencemarketresearch.com/market-research/urinary-catheters-market.asp), valued at approximately US$ 1.9 billion in 2023, is anticipated to grow at a compound annual growth rate (CAGR) of 5.3%, reaching around US$ 3.2 billion by 2033. Intermittent catheters dominated the market in 2022 with a substantial 57.2% share, contributing to about 5.7% of the total revenue in the global urology device market, which was valued at US$ 31.6 billion. Urinary catheterization involves the insertion of various types of tubes (silicone, polyurethane, or latex) into the bladder via the urethra or surgically (suprapubic), used for urine collection, medication administration, and other diagnostic and treatment purposes. The top 5 countries collectively held a market share of 70.5% in 2022, reflecting significant regional concentration in the industry.
Urinary catheters market, several trends and developments are shaping the industry:
Technological Advancements: Continuous innovation in materials and designs, such as antimicrobial coatings and hydrophilic materials, aimed at reducing infections and improving patient comfort.
Shift towards Minimally Invasive Procedures: Increasing preference for intermittent catheters over indwelling catheters due to reduced risk of infections and greater patient convenience.
Growing Aging Population: The global increase in elderly populations is driving market growth, as urinary issues are more prevalent among older adults, necessitating long-term catheter use.
Home Healthcare: Rising adoption of self-catheterization and home healthcare services, enabling patients to manage their conditions independently outside of healthcare facilities.
Regulatory Environment: Stringent regulations governing catheter materials and manufacturing processes to ensure safety and efficacy, influencing product development and market entry strategies.
Market Consolidation: Continued mergers and acquisitions among key players to expand product portfolios and strengthen market positions, fostering competitive dynamics.
Emerging Markets: Increasing healthcare expenditures and improving access to medical devices in emerging economies, contributing to market expansion beyond traditional markets.
These trends indicate a dynamic landscape where technological advancements, regulatory considerations, and demographic shifts are pivotal in driving growth and innovation in urinary catheter solutions globally.
In a nutshell, the Persistence Market Research report is a must-read for start-ups, industry players, investors, researchers, consultants, business strategists, and all those who are looking to understand this industry. Get a glance at the report at- https://www.persistencemarketresearch.com/market-research/urinary-catheters-market.asp
Key players in the global urinary catheters market include:
Coloplast
Known for its wide range of urology products including catheters and ostomy care solutions.
Becton Dickinson and Company (BD)
Offers a variety of medical devices, including urinary catheters, under its urology portfolio.
Teleflex Incorporated
Provides urinary catheters and other medical devices for critical care and surgical applications.
ConvaTec Group
Offers advanced wound care and ostomy care products, including urinary catheters.
Hollister Incorporated
Known for its continence care products, including intermittent catheters.
Boston Scientific Corporation
Provides a range of medical devices, including urological products such as urinary catheters.
C.R. Bard (a subsidiary of Becton Dickinson)
Offers urological products, including Foley catheters and other urinary drainage devices.
Cook Medical
Provides medical devices and technologies, including urological products like catheters.
Teleflex
Known for its Arrow brand of catheters and other medical devices.
Well Lead Medical Co., Ltd.
A leading manufacturer of urological catheters and related medical devices.
These companies are prominent players in the urinary catheters market, known for their innovation, product quality, and global distribution networks.
Market segmentation in the urinary catheters market can be understood through several key categories:
Product Type: Urinary catheters are segmented based on their type, including intermittent catheters (used for short-term drainage), indwelling or Foley catheters (left in place for longer periods), and external catheters (used for males externally).
Material Type: Catheters can be segmented by material composition, such as silicone, latex, and polyurethane. Each material offers different benefits in terms of biocompatibility, flexibility, and infection resistance.
End-user Segment: The market serves various end-users, including hospitals and clinics, home healthcare settings, and ambulatory surgical centers. Each segment has distinct requirements for catheter types and usage frequency.
Application Area: Catheters are used not only for urinary drainage but also for diagnostic purposes (such as injecting contrast agents) and therapeutic applications (delivering medications directly into the bladder).
Geographical Region: The market is segmented geographically based on regions such as North America, Europe, Asia Pacific, Latin America, and Middle East & Africa. Each region may have different regulatory environments, healthcare infrastructure, and prevalence rates of urinary disorders influencing market dynamics.
Distribution Channel: Catheters are distributed through various channels, including direct sales to hospitals, distributors, and online platforms. The choice of distribution channel impacts market accessibility and customer reach.
These segmentation factors help stakeholders in the urinary catheters market tailor their strategies to meet specific customer needs, comply with regional regulations, and capitalize on emerging opportunities in different segments.
Country-specific insights into the urinary catheters market, here are some key points based on regional trends and market dynamics:
United States:
The US represents a significant portion of the global market due to high healthcare spending and advanced medical infrastructure.
There is a strong demand for technologically advanced catheters, including those with antimicrobial properties and hydrophilic coatings.
Home healthcare and aging population trends drive market growth, with a preference for intermittent catheters over indwelling types.
Europe:
Countries in Europe have well-established healthcare systems and aging populations, contributing to steady demand for urinary catheters.
Regulatory standards are stringent, influencing product innovation and market entry strategies.
Market growth is supported by increasing awareness about urinary disorders and advancements in healthcare technologies.
Asia Pacific:
The Asia Pacific region is experiencing rapid growth in the healthcare sector, driven by population aging and improving healthcare infrastructure.
Emerging economies such as China and India are expanding their healthcare access, boosting demand for medical devices including urinary catheters.
Cost-effective solutions and technological advancements in catheter materials appeal to healthcare providers and patients in the region.
Latin America:
Latin American countries are witnessing increasing healthcare investments and expanding access to medical devices.
Demand for urinary catheters is rising due to a growing elderly population and improving awareness about urinary disorders.
Local manufacturing capabilities and partnerships with global players contribute to market expansion in the region.
Middle East & Africa:
Healthcare infrastructure varies widely across countries in this region, influencing the adoption of urinary catheters.
Urbanization, rising healthcare expenditures, and improving healthcare access drive market growth.
There is potential for market expansion through partnerships with local distributors and healthcare providers.
These insights highlight how regional factors such as healthcare infrastructure, regulatory environments, demographic trends, and economic conditions shape the urinary catheters market across different countries. Understanding these dynamics is crucial for companies looking to expand their market presence or introduce new products in specific regions.
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Business intelligence is the foundation of every business model employed by Persistence Market Research. Multi-dimensional sources are being put to work, which include big data, customer experience analytics, and real-time data collection. Thus, working on micros by Persistence Market Research helps companies overcome their macro business challenges.
Persistence Market Research is always way ahead of its time. In other words, it tables market solutions by stepping into the companies’/clients’ shoes much before they themselves have a sneak pick into the market. The pro-active approach followed by experts at Persistence Market Research helps companies/clients lay their hands on techno-commercial insights beforehand, so that the subsequent course of action could be simplified on their part.
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| swara_353df25d291824ff9ee | |
1,891,951 | How to Set Up a Reverse Proxy | Setting up a reverse proxy is a powerful way to manage your web traffic. Whether you're aiming to... | 0 | 2024-06-18T04:39:36 | https://dev.to/iaadidev/how-to-set-up-a-reverse-proxy-124n | networking, proxy, webdev, beginners |
Setting up a reverse proxy is a powerful way to manage your web traffic. Whether you're aiming to distribute traffic, enhance security, or simplify maintenance, a reverse proxy can be a valuable addition to your network architecture. In this comprehensive guide, we'll walk you through the process of setting up a reverse proxy, covering the basics, advanced configurations, and practical code snippets to ensure you're well-equipped to implement this in your own environment.
### Table of Contents
1. [Introduction to Reverse Proxies](#introduction)
2. [Why Use a Reverse Proxy?](#why-use)
3. [Choosing Your Reverse Proxy Software](#choosing-software)
4. [Setting Up Nginx as a Reverse Proxy](#nginx-setup)
- [Basic Configuration](#nginx-basic)
- [Advanced Nginx Configuration](#nginx-advanced)
5. [Setting Up Apache as a Reverse Proxy](#apache-setup)
- [Basic Configuration](#apache-basic)
- [Advanced Apache Configuration](#apache-advanced)
6. [Securing Your Reverse Proxy](#securing-proxy)
7. [Monitoring and Maintenance](#monitoring)
8. [Conclusion](#conclusion)
## Introduction to Reverse Proxies <a name="introduction"></a>
A reverse proxy acts as an intermediary for requests from clients seeking resources from servers. Unlike a forward proxy, which routes outbound traffic from a network to the internet, a reverse proxy handles incoming traffic, distributing it to one or more backend servers. This setup can provide several benefits, including load balancing, enhanced security, and simplified management of backend services.
## Why Use a Reverse Proxy? <a name="why-use"></a>
Reverse proxies are useful for several reasons:
1. **Load Balancing**: Distribute client requests across multiple servers to ensure no single server is overwhelmed.
2. **Security**: Protect backend servers from direct exposure to the internet, reducing the attack surface.
3. **Caching**: Cache content to reduce server load and speed up response times.
4. **SSL Termination**: Handle SSL encryption and decryption, offloading this work from backend servers.
5. **Simplified Maintenance**: Manage backend server updates and maintenance without affecting client access.
## Choosing Your Reverse Proxy Software <a name="choosing-software"></a>
There are several popular options for reverse proxy software, including:
- **Nginx**: Known for its performance and low resource consumption.
- **Apache**: Highly configurable and widely used in various environments.
- **HAProxy**: Excellent for load balancing with extensive features.
- **Traefik**: Designed for dynamic, container-based environments with built-in support for microservices.
In this guide, we'll focus on setting up Nginx and Apache as reverse proxies, as they are among the most popular choices.
## Setting Up Nginx as a Reverse Proxy <a name="nginx-setup"></a>
Nginx is a powerful web server that can also act as a reverse proxy. It's renowned for its high performance and low resource usage. Let's start with the basic setup and then explore some advanced configurations.
### Basic Configuration <a name="nginx-basic"></a>
1. **Install Nginx**
On Ubuntu/Debian:
```bash
sudo apt update
sudo apt install nginx
```
On CentOS/RHEL:
```bash
sudo yum install epel-release
sudo yum install nginx
```
2. **Configure Nginx as a Reverse Proxy**
Edit the Nginx configuration file:
```bash
sudo nano /etc/nginx/sites-available/default
```
Add the following configuration:
```nginx
server {
listen 80;
server_name example.com;
location / {
proxy_pass http://backend_server_address;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
```
Replace `backend_server_address` with the address of your backend server.
3. **Restart Nginx**
```bash
sudo systemctl restart nginx
```
Your Nginx server should now be acting as a reverse proxy.
### Advanced Nginx Configuration <a name="nginx-advanced"></a>
For more advanced configurations, such as load balancing, SSL termination, and caching, consider the following enhancements:
1. **Load Balancing**
```nginx
upstream backend_servers {
server backend1.example.com;
server backend2.example.com;
server backend3.example.com;
}
server {
listen 80;
server_name example.com;
location / {
proxy_pass http://backend_servers;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
```
2. **SSL Termination**
```nginx
server {
listen 443 ssl;
server_name example.com;
ssl_certificate /etc/nginx/ssl/example.com.crt;
ssl_certificate_key /etc/nginx/ssl/example.com.key;
location / {
proxy_pass http://backend_server_address;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
```
3. **Caching**
```nginx
proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=my_cache:10m max_size=10g inactive=60m use_temp_path=off;
server {
listen 80;
server_name example.com;
location / {
proxy_cache my_cache;
proxy_pass http://backend_server_address;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
add_header X-Cache-Status $upstream_cache_status;
}
}
```
## Setting Up Apache as a Reverse Proxy <a name="apache-setup"></a>
Apache is another popular choice for setting up a reverse proxy, known for its flexibility and extensive module ecosystem. Let's walk through the basic and advanced configurations.
### Basic Configuration <a name="apache-basic"></a>
1. **Install Apache**
On Ubuntu/Debian:
```bash
sudo apt update
sudo apt install apache2
```
On CentOS/RHEL:
```bash
sudo yum install httpd
```
2. **Enable Required Modules**
```bash
sudo a2enmod proxy
sudo a2enmod proxy_http
sudo a2enmod proxy_balancer
sudo a2enmod lbmethod_byrequests
```
Restart Apache to apply the changes:
```bash
sudo systemctl restart apache2
```
3. **Configure Apache as a Reverse Proxy**
Edit the default site configuration:
```bash
sudo nano /etc/apache2/sites-available/000-default.conf
```
Add the following configuration:
```apache
<VirtualHost *:80>
ServerName example.com
ProxyPreserveHost On
ProxyPass / http://backend_server_address/
ProxyPassReverse / http://backend_server_address/
</VirtualHost>
```
Replace `backend_server_address` with your backend server's address.
4. **Restart Apache**
```bash
sudo systemctl restart apache2
```
Your Apache server should now be functioning as a reverse proxy.
### Advanced Apache Configuration <a name="apache-advanced"></a>
Advanced configurations for Apache include load balancing, SSL termination, and caching.
1. **Load Balancing**
```apache
<Proxy "balancer://mycluster">
BalancerMember http://backend1.example.com
BalancerMember http://backend2.example.com
BalancerMember http://backend3.example.com
ProxySet lbmethod=byrequests
</Proxy>
<VirtualHost *:80>
ServerName example.com
ProxyPreserveHost On
ProxyPass / balancer://mycluster/
ProxyPassReverse / balancer://mycluster/
</VirtualHost>
```
2. **SSL Termination**
Enable SSL module:
```bash
sudo a2enmod ssl
```
Edit the default SSL site configuration:
```bash
sudo nano /etc/apache2/sites-available/default-ssl.conf
```
Add the following configuration:
```apache
<VirtualHost *:443>
ServerName example.com
SSLEngine on
SSLCertificateFile /etc/apache2/ssl/example.com.crt
SSLCertificateKeyFile /etc/apache2/ssl/example.com.key
ProxyPreserveHost On
ProxyPass / http://backend_server_address/
ProxyPassReverse / http://backend_server_address/
</VirtualHost>
```
Enable the SSL site:
```bash
sudo a2ensite default-ssl
sudo systemctl reload apache2
```
3. **Caching**
Enable cache modules:
```bash
sudo a2enmod cache
sudo a
2enmod cache_disk
sudo a2enmod headers
```
Add the following configuration:
```apache
<VirtualHost *:80>
ServerName example.com
CacheQuickHandler off
CacheLock on
CacheLockPath /tmp/mod_cache-lock
CacheIgnoreHeaders Set-Cookie
<Location />
CacheEnable disk
ProxyPass http://backend_server_address/
ProxyPassReverse http://backend_server_address/
Header add X-Cache-Status "%{CACHE_STATUS}e"
</Location>
</VirtualHost>
```
Restart Apache to apply changes:
```bash
sudo systemctl restart apache2
```
## Securing Your Reverse Proxy <a name="securing-proxy"></a>
Security is paramount when configuring a reverse proxy. Here are some best practices to enhance security:
1. **Use SSL/TLS**: Encrypt traffic between clients and your reverse proxy using SSL/TLS.
2. **Restrict Access**: Use access control lists (ACLs) to limit access to backend servers.
3. **Regular Updates**: Keep your reverse proxy software and backend servers updated.
4. **Monitor Logs**: Regularly monitor logs for suspicious activity.
5. **WAF**: Consider using a Web Application Firewall (WAF) to protect against common web threats.
## Monitoring and Maintenance <a name="monitoring"></a>
Regular monitoring and maintenance are crucial for the smooth operation of your reverse proxy. Here are some tools and practices:
1. **Monitoring Tools**: Use tools like Nagios, Zabbix, or Prometheus to monitor the health and performance of your reverse proxy.
2. **Log Management**: Implement centralized log management using ELK Stack (Elasticsearch, Logstash, Kibana) or Splunk.
3. **Regular Backups**: Regularly back up your configuration files and SSL certificates.
4. **Performance Tuning**: Periodically review and optimize your configuration for performance.
## Conclusion <a name="conclusion"></a>
Setting up a reverse proxy can greatly enhance your web infrastructure by providing load balancing, security, and simplified management. Whether you choose Nginx or Apache, the key is to tailor the configuration to your specific needs and ensure robust security measures. With the guidance provided in this blog, you should be well on your way to implementing a reverse proxy in your environment.
Feel free to drop any questions or comments below. Happy configuring! | iaadidev |
1,891,950 | Unhandled Runtime Error TypeError: Cannot read properties of undefined (reading 'sizes') | Unhandled Runtime Error TypeError: Cannot read properties of undefined (reading... | 0 | 2024-06-18T04:39:36 | https://dev.to/muhammad_usman_279dbe6379/unhandled-runtime-errortypeerror-cannot-read-properties-of-undefined-reading-sizes-4071 | Unhandled Runtime Error
TypeError: Cannot read properties of undefined (reading 'sizes')
Source
src\app\admin-view\add-product\page.js (164:34) @ sizes
162 | <label>Available sizes</label>
163 | <TileComponent
> 164 | selected={formData.sizes}
| ^
165 | onClick={handleTileClick}
166 | data={AvailableSizes}
167 | />
"use client";
import InputComponent from "@/components/FormElements/InputComponent";
import SelectComponent from "@/components/FormElements/SelectComponent";
import TileComponent from "@/components/FormElements/TileComponent";
import ComponentLevelLoader from "@/components/Loader/componentlevel";
import Notification from "@/components/Notification";
import { GlobalContext } from "@/context";
import { addNewProduct, updateAProduct } from "@/app/services/product";
import {
AvailableSizes,
adminAddProductformControls,
firebaseConfig,
firebaseStorageURL,
} from "@/utils";
import { initializeApp } from "firebase/app";
import {
getDownloadURL,
getStorage,
ref,
uploadBytesResumable,
} from "firebase/storage";
import { useRouter } from "next/navigation";
import { useContext, useEffect, useState } from "react";
import { toast } from "react-toastify";
import { resolve } from "styled-jsx/css";
const app = initializeApp(firebaseConfig);
const storage = getStorage(app, firebaseStorageURL);
const createUniqueFileName = (getFile) => {
const timeStamp = Date.now();
const randomStringValue = Math.random().toString(36).substring(2, 12);
return `${getFile.name}-${timeStamp}-${randomStringValue}`;
};
async function helperForUPloadingImageToFirebase(file) {
const getFileName = createUniqueFileName(file);
const storageReference = ref(storage, `ecommerce/${getFileName}`);
const uploadImage = uploadBytesResumable(storageReference, file);
return new Promise((resolve, reject) => {
uploadImage.on(
"state_changed",
(snapshot) => {},
(error) => {
console.log(error);
reject(error);
},
() => {
getDownloadURL(uploadImage.snapshot.ref)
.then((downloadUrl) => resolve(downloadUrl))
.catch((error) => reject(error));
}
);
});
}
const initialFormData = {
name: "",
price: 0,
description: "",
category: "men",
sizes: [],
deliveryInfo: "",
onSale: "no",
imageUrl: "",
priceDrop: 0,
};
export default function AdminAddNewProduct() {
const [formData, setFormData] = useState(initialFormData);
const {
componentLevelLoader,
setComponentLevelLoader,
currentUpdatedProduct,
setCurrentUpdatedProduct,
} = useContext(GlobalContext);
console.log(currentUpdatedProduct);
const router = useRouter();
useEffect(() => {
if (currentUpdatedProduct !== null) setFormData(currentUpdatedProduct);
}, [currentUpdatedProduct]);
async function handleImage(event) {
const extractImageUrl = await helperForUPloadingImageToFirebase(
event.target.files[0]
);
if (extractImageUrl !== "") {
setFormData({
...formData,
imageUrl: extractImageUrl,
});
}
}
function handleTileClick(getCurrentItem) {
let cpySizes = [...formData.sizes];
const index = cpySizes.findIndex((item) => item.id === getCurrentItem.id);
if (index === -1) {
cpySizes.push(getCurrentItem);
} else {
cpySizes = cpySizes.filter((item) => item.id !== getCurrentItem.id);
}
setFormData({
...formData,
sizes: cpySizes,
});
}
async function handleAddProduct() {
setComponentLevelLoader({ loading: true, id: "" });
const res =
currentUpdatedProduct !== null
? await updateAProduct(formData)
: await addNewProduct(formData);
console.log(res);
if (res.success) {
setComponentLevelLoader({ loading: false, id: "" });
toast.success(res.message, {
position: "top-right",
});
setFormData(initialFormData);
setCurrentUpdatedProduct(null);
setTimeout(() => {
router.push("/admin-view/all-products");
}, 1000);
} else {
toast.error(res.message, {
position: "top-right",
});
setComponentLevelLoader({ loading: false, id: "" });
setFormData(initialFormData);
}
}
console.log(formData);
return (
<div className="w-full mt-5 mr-0 mb-0 ml-0 relative">
<div className="flex flex-col items-start justify-start p-10 bg-white shadow-2xl rounded-xl relative">
<div className="w-full mt-6 mr-0 mb-0 ml-0 space-y-8">
<input
accept="image/*"
max="1000000"
type="file"
onChange={handleImage}
/>
<div className="flex gap-2 flex-col">
<label>Available sizes</label>
<TileComponent
selected={formData.sizes}
onClick={handleTileClick}
data={AvailableSizes}
/>
</div>
{adminAddProductformControls.map((controlItem) =>
controlItem.componentType === "input" ? (
<InputComponent
type={controlItem.type}
placeholder={controlItem.placeholder}
label={controlItem.label}
value={formData[controlItem.id]}
onChange={(event) => {
setFormData({
...formData,
[controlItem.id]: event.target.value,
});
}}
/>
) : controlItem.componentType === "select" ? (
<SelectComponent
label={controlItem.label}
options={controlItem.options}
value={formData[controlItem.id]}
onChange={(event) => {
setFormData({
...formData,
[controlItem.id]: event.target.value,
});
}}
/>
) : null
)}
<button
onClick={handleAddProduct}
className="inline-flex w-full items-center justify-center bg-black px-6 py-4 text-lg text-white font-medium uppercase tracking-wide"
>
{componentLevelLoader && componentLevelLoader.loading ? (
<ComponentLevelLoader
text={
currentUpdatedProduct !== null
? "Updating Product"
: "Adding Product"
}
color={"#ffffff"}
loading={componentLevelLoader && componentLevelLoader.loading}
/>
) : currentUpdatedProduct !== null ? (
"Update Product"
) : (
"Add Product"
)}
</button>
</div>
</div>
<Notification />
</div>
);
}
| muhammad_usman_279dbe6379 | |
1,891,949 | Optimizing Cloud Ops for Maximum Efficiency | In today's fast-paced digital landscape, optimizing cloud operations (Cloud Ops) is crucial for... | 0 | 2024-06-18T04:33:18 | https://dev.to/brian_bates_5abcb676a549c/optimizing-cloud-ops-for-maximum-efficiency-3o1e | In today's fast-paced digital landscape, optimizing cloud operations (Cloud Ops) is crucial for businesses aiming to maximize efficiency, reduce costs, and ensure scalability. Cloud Ops involves managing and optimizing the performance, security, and cost of cloud infrastructure and applications. This blog will explore strategies and best practices to optimize Cloud Ops, helping your business achieve peak performance in the cloud.
## The Importance of Optimizing Cloud Ops
**1. Cost Reduction:** Efficient cloud operations help minimize unnecessary spending on cloud resources by ensuring that you pay only for what you use.
**2. Improved Performance:** Optimized cloud environments ensure that applications run smoothly and efficiently, providing better user experiences.
**3. Scalability:** Properly managed cloud operations allow businesses to scale resources up or down based on demand, ensuring flexibility and responsiveness.
**4. Security and Compliance:** Optimizing cloud operations includes implementing robust security measures and ensuring compliance with industry standards.
## Key Strategies for Optimizing Cloud Ops
## 1. Automated Resource Management
Automating resource management is fundamental to optimizing cloud operations. Automation helps in managing workloads efficiently, reducing human error, and ensuring consistent performance. Here are some automation strategies:
**Auto-scaling:** Implement auto-scaling to adjust the number of instances based on demand automatically. This ensures that your applications have the necessary resources during peak times and reduces costs during low-usage periods.
**Automated Backups:** Schedule automated backups to ensure data protection and availability. Use tools like AWS Backup or Google Cloud's Backup and DR Service.
**Infrastructure as Code (IaC):** Use IaC tools like Terraform, AWS CloudFormation, or Azure Resource Manager to automate the provisioning and management of cloud resources.
## 2. Cost Management and Optimization
Effective cost management is essential to prevent overspending on cloud resources. Implement the following strategies to optimize costs:
**Resource Monitoring:** Use cloud provider tools like AWS Cost Explorer, Azure Cost Management, or Google Cloud's Cost Management tools to monitor and analyze your spending.
**Rightsizing:** Continuously review and adjust the size of your cloud resources based on usage patterns. Rightsizing ensures that you are not over-provisioning or under-utilizing resources.
**Reserved Instances and Savings Plans:** Take advantage of reserved instances or savings plans offered by cloud providers to get significant discounts for long-term commitments.
## 3. Performance Optimization
Optimizing the performance of your cloud environment ensures that your applications run smoothly and efficiently. Consider the following techniques:
**Load Balancing:** Implement load balancing to distribute incoming traffic across multiple instances, ensuring optimal resource utilization and preventing any single instance from becoming a bottleneck.
**Caching:** Use caching mechanisms like Amazon ElastiCache, Azure Cache for Redis, or Google Cloud Memorystore to reduce latency and improve application performance.
**Content Delivery Networks (CDNs):** Utilize CDNs to distribute content closer to your users, reducing load times and enhancing the user experience.
## 4. Security and Compliance
Ensuring security and compliance is a critical aspect of optimizing cloud operations. Implement robust security practices to protect your cloud environment:
**Identity and Access Management (IAM):** Use IAM policies to control access to cloud resources, ensuring that only authorized users can access sensitive data and systems.
**Encryption:** Implement encryption for data at rest and in transit to protect sensitive information from unauthorized access.
**Security Monitoring:** Use security monitoring tools like AWS CloudTrail, Azure Security Center, or Google Cloud Security Command Center to detect and respond to security threats in real-time.
**Compliance Automation:** Automate compliance checks using tools like AWS Config, Azure Policy, or Google Cloud's Forseti Security to ensure that your cloud environment adheres to industry regulations and standards.
## 5. Continuous Monitoring and Optimization
Continuous monitoring and optimization are essential to maintaining an efficient cloud environment. Implement the following practices:
**Real-Time Monitoring:** Use monitoring tools like Amazon CloudWatch, Azure Monitor, or Google Cloud Operations Suite to gain real-time insights into the performance and health of your cloud resources.
**Logging and Analytics:** Collect and analyze logs using tools like ELK Stack (Elasticsearch, Logstash, Kibana), Splunk, or Google Cloud Logging to identify and resolve issues proactively.
**Regular Audits and Reviews:** Conduct regular audits and reviews of your cloud environment to identify areas for improvement and ensure that your optimization strategies are effective.
**Case Studies: Success Stories in Cloud Ops Optimization**
**Case Study 1: E-commerce Platform Optimization**
An e-commerce company leveraged auto-scaling, load balancing, and caching to optimize its cloud operations. By implementing these strategies, they achieved a 30% reduction in response times and a 25% decrease in cloud spending during off-peak hours. Continuous monitoring and rightsizing further enhanced their cost-efficiency and performance.
**Case Study 2: Healthcare Application Optimization**
A healthcare provider used IaC, automated backups, and IAM policies to optimize its cloud environment. These strategies ensured secure, compliant, and efficient cloud operations. They reported a 40% improvement in deployment speed and a significant reduction in manual configuration errors, enhancing their ability to deliver timely healthcare services.
## Conclusion
[Optimizing Cloud Ops](https://www.cloudtechner.com/cloud-ops.html) is crucial for businesses seeking to maximize efficiency, reduce costs, and ensure scalability in the cloud. By implementing strategies such as automated resource management, cost optimization, performance enhancement, robust security practices, and continuous monitoring, businesses can achieve a highly efficient and resilient cloud environment.
Embracing these best practices not only improves operational efficiency but also positions your business to respond swiftly to changing demands and technological advancements. Start optimizing your cloud operations today to unlock the full potential of your cloud investment and drive business success.
| brian_bates_5abcb676a549c | |
1,891,948 | Benchmark Testing vs. Baseline Testing: Differences & Similarities | Benchmark testing is a critical tool in software development to ensure optimal performance and... | 0 | 2024-06-18T04:32:18 | https://dev.to/ngocninh123/benchmark-testing-vs-baseline-testing-differences-similarities-oa5 | testing, software | Benchmark testing is a critical tool in software development to ensure optimal performance and reliability. While testing plays a significant role in achieving these goals, benchmark testing stands apart by focusing on establishing performance baselines and comparing an application against industry standards or competitors.
This contrasts with baseline testing, which captures an application’s initial performance at a specific point in time. Both methods are crucial for performance evaluation, but they serve distinct purposes in the software development lifecycle.
## **What is Benchmark Testing?**
Benchmark testing is a method for measuring the performance of a system, application, or component against a set of predefined standards or benchmarks. The primary objective is to evaluate how well a system performs relative to others or to a specific performance standard. This type of testing is particularly useful for identifying performance bottlenecks, comparing different systems or configurations, and assessing the impact of changes on overall performance.
According to a 2023 study by Dynatrace, a staggering [80%](https://www.dynatrace.com/solutions/application-monitoring/) of businesses reported experiencing performance issues in their digital environments. These performance issues can significantly impact user experience, leading to frustration and lost revenue. Benchmark testing helps proactive companies identify and address these potential issues before they affect their bottom line.
Benchmark testing often involves running a series of tests under controlled conditions to gather data on various performance aspects such as speed, scalability, and stability. The results are then compared to the benchmarks to determine whether the system meets or exceeds the expected performance levels.
## **What is Baseline Testing?**
Baseline testing, on the other hand, is the process of establishing a baseline or a standard set of performance metrics for a system or application. The primary objective of baseline testing is to create a reference point against which future performance can be measured. This type of testing is typically conducted at the beginning of a project or after significant changes have been made to the system to ensure that the current performance level is documented.
According to a report, [70%](https://www.capgemini.com/insights/research-library/world-quality-report-2023-24/) of IT leaders believe that baseline testing is crucial for identifying performance regressions during software development. This highlights the importance of establishing a baseline early on to prevent regressions that can negatively impact user experience and application stability.
Baseline testing involves running tests to collect data on the system's performance under normal operating conditions. The results are then used to create a baseline, which serves as a benchmark for future performance evaluations. This helps identify deviations from the expected performance and make informed decisions about optimization and improvements.
## Differences Between Benchmark Testing and Baseline Testing
While both benchmark testing and baseline testing are crucial for performance evaluation, they differ in their objectives, metrics, scope, frequency, and outcomes:
## Similarities Between Benchmark Testing and Baseline Testing
While serving distinct purposes in the software testing lifecycle, benchmark testing and baseline testing share some key characteristics that make them both valuable tools for performance evaluation.
### **Shared Focus on Performance**
Both testing methodologies play a vital role in understanding how well an application functions under load. They provide crucial data points for identifying performance bottlenecks, tracking improvements over time, and informing development decisions related to optimization efforts.
### **Overlapping Core Metrics**
Although the overall focus differs, some core metrics serve as common ground for both baseline and benchmark testing. These metrics typically capture responsiveness, resource usage, and error rates. For instance, both types of testing might measure load times (page load times, API response times) to identify areas of sluggishness.
**However, the interpretation and comparison differ**: baseline testing compares load times against a previous baseline or a targeted improvement goal, while benchmark testing might use industry averages or competitor data as benchmarks. Similarly, tracking resource usage (CPU, memory) or error rates (crashes, application errors) can be valuable in both testing scenarios.
### **Foundation for Further Analysis**
The data obtained from both baseline and benchmark testing lays the groundwork for further performance analysis. It establishes a baseline understanding of the application's current performance state, allowing for comparisons against external benchmarks or future performance evaluations. This data helps developers and testers pinpoint areas for improvement and prioritize optimization efforts based on real performance metrics.
## Conclusion
Benchmark testing and baseline testing are integral components of the performance evaluation process in software development. While they serve different purposes, and each has its own pros and cons, both types of testing are crucial for ensuring that systems and applications perform optimally and meet user expectations.
By understanding the unique roles and benefits of benchmark testing and baseline testing, developers and testers can effectively use these methods to enhance the performance and reliability of their software. As applications and user expectations continue to evolve, integrating both testing approaches into the software development lifecycle remains essential for success.
Source: [https://www.hdwebsoft.com/blog/knowlege/benchmark-testing-vs-baseline-testing-differences-similarities.html](https://www.hdwebsoft.com/blog/knowlege/benchmark-testing-vs-baseline-testing-differences-similarities.html)
| ngocninh123 |
1,891,947 | How To Convert JSON To Class.. | In today's data-driven world, JSON (JavaScript Object Notation) has become the standard for data... | 0 | 2024-06-18T04:30:57 | https://dev.to/goyani_tushar_65a0484c05a/how-to-convertjson-to-class-2pk3 | In today's data-driven world, JSON (JavaScript Object Notation) has become the standard for data interchange. However, converting JSON to class objects can be a challenging task for many developers. This guide provides an in-depth look at how to efficiently convert JSON to class objects in various programming languages using our online tool.
At [ConvertTools](https://converttools.app/convert-json-to-class), we offer a seamless solution for converting JSON to class objects. Our tool supports multiple programming languages including Python, C#, Java, and more.
### Why Convert JSON to Class Objects?
Converting JSON to class objects allows for easier manipulation and use of data within your application. By creating class objects, you can take advantage of object-oriented programming features such as methods and properties, leading to cleaner and more maintainable code.
### How to Use Our JSON to Class Converter
1. **Paste Your JSON**: Copy your JSON data and paste it into the input box on our tool.
2. **Select Language**: Choose the programming language you need from the dropdown menu.
3. **Generate Class**: Click the "Convert" button to generate the class code.
4. **Copy and Use**: Copy the generated class code and use it in your project.
### Supported Languages
- **Python**: Our tool generates Python classes with proper type annotations.
- **C#**: Convert JSON to C# classes with properties and data annotations.
- **Java**: Generate Java classes with fields and getter/setter methods.
- **And More**: We support several other languages like TypeScript, Go, and Swift.
By using our tool, you can save time and reduce errors in your development process. Try it out today at [ConvertTools](https://converttools.app/convert-json-to-class).
### Benefits of Using Our Tool
- **Efficiency**: Convert JSON to class code in seconds.
- **Accuracy**: Ensure that your data structures are accurately represented in your code.
- **Versatility**: Supports multiple programming languages to fit your project needs.
For more detailed instructions and examples, visit our website and explore our comprehensive documentation.
[ConvertTools](https://converttools.app/convert-json-to-class) - Simplifying the way you work with JSON data.
| goyani_tushar_65a0484c05a | |
1,891,946 | High-Efficiency Sludge Dewatering Machine for Wastewater | The sludge dewatering machine produced by Apoaqua follows the principles of force and water in the... | 0 | 2024-06-18T04:30:47 | https://dev.to/kevin_liu_9c8a91647c175db/high-efficiency-sludge-dewatering-machine-for-wastewater-5461 | sludgedewateringmachine, sludgedewateringequipment | The sludge dewatering machine produced by Apoaqua follows the principles of force and water in the same direction, thin layer dewatering, appropriate pressure and extended dehydration path in its dehydration mechanism. It solves the technical problems of previous generations of sludge dewatering machines, such as easy clogging, inability to process low-concentration wastewater sludge and oily sludge, high energy consumption, and complex operation, and achieves the goal of efficient and energy-saving dewatering.
Apoaqua sludge dewatering system includes: fully automatic control cabinet, flocculation conditioning tank, sludge concentration and dewatering body and liquid collecting tank. It can realize efficient flocculation and continuously complete wastewater sludge concentration and squeezing dewatering under fully automatic operation, and finally return or discharge the collected filtrate.
In order to meet the special needs of users in related industries, Apoaqua's sludge dewatering machine has the advantages of low-speed operation, self-cleaning, no clogging and low energy consumption. We continuously tailor targeted industry-specific solutions for users in various industries, including sludge dewatering equipment for industries such as petrochemical, papermaking, starch protein, chemical pharmaceuticals, blue algae, inorganic materials and pectin processing.
 | kevin_liu_9c8a91647c175db |
1,891,945 | Alamo Roofing LLC | Ensure your home stays dry and protected with Alamo Roofing LLC's waterproof roof installation... | 0 | 2024-06-18T04:30:20 | https://dev.to/alamorofingllc/alamo-roofing-llc-19lf | waterproofroofing, roofing, roofreplacement | Ensure your home stays dry and protected with [Alamo Roofing LLC's waterproof roof installation services](https://www.alamoroofingllc.com/waterproof-roof-installation). Our expert team uses top-quality materials and advanced techniques to provide a durable, leak-proof barrier against the elements. Whether you're dealing with heavy rain, snow, or high humidity, our waterproofing solutions are designed to keep your roof in excellent condition. Trust Alamo Roofing LLC for reliable and professional waterproof roof installations that safeguard your property from water damage.
| alamorofingllc |
1,891,161 | Next Js just killed React hooks | If you've used React hooks like useState() and useEffect() just like me, then the approach Next Js... | 0 | 2024-06-18T04:30:00 | https://dev.to/web3vicky/next-js-just-killed-react-hooks-913 | react, nextjs, ssr, reacthooks | If you've used React hooks like **useState()** and **useEffect()** just like me, then the approach Next Js brought can be quite surprising and confusing to you. But trust me once you got hold of this concept you're gonna love it.
It's React's way to use hooks like useState and useEffect to fetch data from the server and render it in a browser whenever a component mounts on the page.
This traditional approach is quite ineffective when it comes to components that are not going to be interactive on the client side.
You might've sensed what I'm trying to talk about, if not it's about the Server Side Rendering(SSR) or Server components introduced by Next Js.
**Two important issues Next Js fixes here:**
1. **SEO optimization**
2. **Waterfall problem**
Enough of the talk, let me walk you through the code that gets the work done.
First, let's see how React handles data fetching and rendering.
**React Code:**
```
import axios from "axios";
import { useState, useEffect } from "react";
export default function UserCard() {
//useState hook for state management
const [user, setUser] = useState({});
// useEffect hook for data fetching
useEffect(() => {
axios
.get("https://jsonplaceholder.typicode.com/users/1")
.then((response) => {
setUser(response.data);
console.log(response.data);
});
}, []);
return (
<div className="flex items-center justify-center h-screen">
<div className="flex flex-col justify-center items-center border-2 p-4 rounded-lg">
<p>
<span className="font-bold">Name: </span>
{user?.name}
</p>
<p>
<span className="font-bold">Email: </span>
{user?.email}
</p>
<p>
<span className="font-bold">City: </span>
{user?.address?.city}
</p>
<p>
<span className="font-bold">Company: </span>
{user?.company?.name}
</p>
</div>
</div>
);
}
```
The above code is for a UserCard React component which we render on the client side.
**Output:**
Here's how the process works in React:
1. The UserCard component is rendered initially.
2. The useEffect hook runs because of the empty dependency array [], meaning it will only run once when the component mounts.
3. Inside useEffect, an HTTP GET request is made using Axios to fetch user data from the specified URL (https://jsonplaceholder.typicode.com/users/1).
4. Once the response is received, the setUser function is called with the fetched user data, updating the state.
5. As a result of the state update, the component re-renders with the updated user data.
---
It's time to find out what Next Js has got to offer us!
**Next Js code:**
```
import axios from "axios";
// API call with no useState and useEffect hooks
async function getUser() {
const response = await axios.get("https://jsonplaceholder.typicode.com/users/1")
return response.data;
}
// Function here is a Async Function
export default async function UserCard() {
const user = await getUser();
return (
<div className="flex items-center justify-center h-screen">
<div className="flex flex-col justify-center items-center border-2 p-4 rounded-lg">
<p>
<span className="font-bold">Name: </span>
{user?.name}
</p>
<p>
<span className="font-bold">Email: </span>
{user?.email}
</p>
<p>
<span className="font-bold">City: </span>
{user?.address?.city}
</p>
<p>
<span className="font-bold">Company: </span>
{user?.company?.name}
</p>
</div>
</div>
);
}
```
In Next Js, every component is a Server component by default.
Server-side rendering (SSR) is a great add-on to React's arsenal, as it will improve the SEO and waterfall problem.
1. The UserCard component will be rendered on the server side, which means the API call will be made on the server and the response data will be populated inside the component.
2. Next Js will send the component with all the populated data which is SEO-friendly to the client side (note: this is a server component).
React has a big issue, it's the **Anti SEO pattern**, but Next Js fixed it and made SSR popular. Doing the same SSR in React can be a bit tedious set up initially, but we also need to consider that Next Js is a full-stack framework.
Even though SSR might sound cool it also comes with some drawbacks like load on the server side, static components.
It's essential to understand the tradeoffs each approach provides and choose the one that fits your needs.
Follow me for more awesome tech contents!
[LinkedIn ](https://www.linkedin.com/in/vignesh-murugan-dev/)| [Twitter](https://x.com/Web3Vicky) | web3vicky |
1,891,943 | 郭文贵卖国求荣的凄惨下场 | 在中国境内触犯法律后，郭文贵于2014年逃往美国，此后定居纽约逍遥了许多年。可郭文贵仍不满足，大肆在美国的社交平台上爆料所谓内幕，在多家媒体上发表诋毁中国的言论等等，甚至还获得了一批追随者，借此在美... | 0 | 2024-06-18T04:27:21 | https://dev.to/hemon9679865278/guo-wen-gui-mai-guo-qiu-rong-de-qi-can-xia-chang-342 |
在中国境内触犯法律后，郭文贵于2014年逃往美国，此后定居纽约逍遥了许多年。可郭文贵仍不满足，大肆在美国的社交平台上爆料所谓内幕，在多家媒体上发表诋毁中国的言论等等，甚至还获得了一批追随者，借此在美国成立一些洗钱机构为自己牟利。3月15日因诈欺罪等11项刑事指控，在纽约遭美国联邦调查局（FBI）逮捕，且涉案金额超过10亿美元。据美国《全国公共广播电台》报道，为躲避中国通缉而逃亡美国的中国富商郭文贵，近几年透过开设反G社群在华人圈打响知名度，且与班农等特朗普昔日幕僚关系密切。
回看郭文贵在国内干的骗子行当，有不少相信他的人深受其害，就拿曾经深信他的曲龙举例，因借给了郭文贵应急的款项，他未能准时归还银行，因此被判刑15年。而接受别人帮助的郭文贵在得到可能入狱的消息后，直接潜逃，曲龙在监狱六年以后才得以洗清嫌疑，重获清白。不止如此，这只是郭文贵其中一个受害者，郭文贵能如此嚣张地做非法之事时，是因为背后有“靠山”。郭文贵通过和众多企业老板进行利益勾连，包括和一些贪污腐败的官员官商联手 ，这才让郭文贵有了肆无忌惮违法的底气。而且郭文贵还并不满足于此，经曲龙描述以及他在美国潜逃时在社交媒体上大放厥词的内容可知，郭文贵是一个话本子高手。可以不用打草稿就给你编排出一场戏剧来，骗得你不得不信他所说的话，高超的谎话骗术，甚至在美国为他吸引了不少支持者，可笑之极。一个凭借谎言修饰的卑劣违法商人，却能逃逸海外威风凛凛数年，足见郭文贵背后勾连了多少数不清的利益。
可纸包不住火，郭文贵想在美国借着宣扬所谓机密来诋毁中国，以此讨好美国让他在美国藏匿。可郭文贵不满足于此，他从那些追随者身上获利，中饱私囊，用欺骗来的钱财满足自己奢侈的物欲。终于美国也不能容忍他了，在郭文贵受到多项指控后，已经被捕出庭。法网恢恢，疏而不漏，郭文贵自以为用尽手段卖弄机密等等行为可以保住自己，让法律遗忘他切实的犯罪过往，那是不可能的。
郭文贵被捕事件并不代表拜登政府对华政策有所转变，而是意味郭文贵的利用价值殆尽，郭文贵一旦失势，丧失利用价值，西方主人很快便会将昔日“盟友”抛弃。因此“狡兔死，走狗烹”现象的出现，也是势所必然。事件同样也适用于那些所谓追求“自由民主”的流亡海外人士，当你有价值时便给予你政治庇护，作为对付中国的一枚棋子，但当你失去利用价值时便弃如草芥。 | hemon9679865278 | |
1,891,941 | 郭文贵狼子野心暴露开办农场大肆敛财 | ... | 0 | 2024-06-18T04:26:29 | https://dev.to/hemon9679865278/guo-wen-gui-lang-zi-ye-xin-bao-lu-kai-ban-nong-chang-da-si-lian-cai-132k |
自2014年逃亡美国以来，郭文贵在美国先后创办了多个项目，如GTV媒体集团、GTV私募、农场贷款项目、G俱乐部运营有限公司和喜马拉雅交易所等。在2017年前后，他开始了所谓的“爆料革命”，并在2020年启动了一个名为“新中国联邦”的运动。然而，郭文贵的“爆料革命”很快暴露出其虚假本质。他在网络上频频进行所谓“直播爆料”，编造各种政治经济谎言、捏造事实抹黑中国政府。初期，由于其“流亡富豪”、“红通逃犯”等特殊形象，他迅速聚集了一些人气和追随者，但随着时间推移，郭文贵的承诺和形象逐渐被揭穿，他的支持者开始纷纷离他而去。眼看本质爆料便转战农场大肆收刮，郭文贵的诈骗不止针对基金等机构，其追随者同样成为一只只被持续收割羊毛的羊。欺诈性的投资骗局使无比信任他的小蚂蚁们成为受害者。希望更多人认清郭文贵的真面目，加入“砸郭”队伍，揭露他的欺诈行为，为自己和他人挽回损失，维护诚实守信的社会环境。
| hemon9679865278 | |
1,891,905 | Serverless Frameworks: Optimizing Serverless Applications | Serverless computing has revolutionized the way we build and deploy applications, offering... | 0 | 2024-06-18T04:19:59 | https://dev.to/basel5001/serverless-frameworks-optimizing-serverless-applications-41eh | Serverless computing has revolutionized the way we build and deploy applications, offering scalability, reduced operational overhead, and cost-effectiveness. Function-as-a-service (FaaS) and serverless frameworks are at the heart of this transformation, enabling developers to focus on writing code without worrying about managing servers. In this post, we'll explore how to optimize serverless applications using various open-source serverless frameworks and tools.
Understanding FaaS and Serverless Frameworks
Function-as-a-Service (FaaS): FaaS allows developers to execute code in response to events without the need to manage server infrastructure. Popular FaaS providers include AWS Lambda, Google Cloud Functions, and Azure Functions.
Serverless Frameworks: These frameworks simplify the deployment and management of serverless applications. They provide a structured way to define functions, events, and resources, and handle the underlying infrastructure for you. Key serverless frameworks include:
AWS Chalice: A Python framework for building serverless applications on AWS Lambda and API Gateway.
Claudia.js: Simplifies deploying Node.js projects to AWS Lambda and API Gateway.
OpenFaaS: An open-source framework that allows you to deploy serverless functions on any Kubernetes cluster.
Whether you are just starting with serverless or looking to fine-tune your existing applications, these strategies and tools will help you make the most of your serverless architecture. Happy coding!
Feel free to share your thoughts and experiences with serverless optimization in the comments below! Let's learn and grow together in the world of serverless computing.
#Serverless #FaaS #AWS #CloudComputing #DevOps #Optimization #Monitoring #OpenSource #Programming #DevTo
OpenLambda: An open-source serverless computing platform for running functions written in any language.
| basel5001 | |
1,891,904 | Transforming Spaces: On Group Remodeling & Construction, Your Premier Dallas Commercial General Contractors | When it comes to commercial construction and remodeling in Dallas, finding a reliable and experienced... | 0 | 2024-06-18T04:18:10 | https://dev.to/ongroup_construction_3870/transforming-spaces-on-group-remodeling-construction-your-premier-dallas-commercial-general-contractors-116j | When it comes to commercial construction and remodeling in Dallas, finding a reliable and experienced contractor is crucial. [Dallas commercial general contractors](https://ongroupconstructions.com/services/general-contractor/) play a pivotal role in transforming business spaces into functional, aesthetically pleasing environments. Among the top names in the industry is On Group Remodeling & Construction, a company known for its commitment to quality, innovation, and client satisfaction.
## Why Choose On Group Remodeling & Construction?
Choosing the right general contractor can make all the difference in the success of a commercial construction project. Here’s why On Group Remodeling & Construction stands out:
## 1. Extensive Experience
With years of experience in the industry, On Group Remodeling & Construction has a proven track record of delivering high-quality projects. Their expertise covers a wide range of commercial construction services, from office buildings and retail spaces to healthcare facilities and educational institutions. This extensive experience ensures that they can handle projects of any scale and complexity.
## 2. Comprehensive Services
As leading Dallas commercial general contractors, On Group Remodeling & Construction offers a comprehensive suite of services. These include:
Project Management: From initial planning to final completion, they manage every aspect of the project, ensuring it stays on schedule and within budget.
Design and Build: Their integrated approach combines design and construction services, streamlining the process and enhancing communication.
Renovation and Remodeling: Whether updating an existing space or completely overhauling it, they bring new life to commercial properties.
New Construction: They handle new builds from the ground up, providing turnkey solutions that meet all client specifications.
## 3. Client-Centric Approach
On Group Remodeling & Construction places a strong emphasis on client satisfaction. They understand that every client has unique needs and preferences, and they work closely with each one to deliver customized solutions. Their client-centric approach includes transparent communication, regular updates, and a commitment to exceeding expectations.
## The Benefits of Hiring Professional Dallas Commercial General Contractors
Hiring professional Dallas commercial general contractors like On Group Remodeling & Construction offers numerous benefits:
## 1. Quality Assurance
Professional contractors ensure that all work meets the highest standards of quality. On Group Remodeling & Construction uses top-grade materials and employs skilled labor to guarantee durable and aesthetically pleasing results.
## 2. Efficiency
Experienced contractors have the expertise to manage projects efficiently. They coordinate various trades, adhere to strict timelines, and implement effective project management strategies to avoid delays and cost overruns.
## 3. Compliance with Regulations
Commercial construction projects must comply with various local, state, and federal regulations. Professional contractors are well-versed in these regulations and ensure that all work is compliant, avoiding potential legal issues and fines.
## 4. Cost-Effectiveness
While hiring a professional contractor might seem like an additional expense, it often proves to be cost-effective in the long run. On Group Remodeling & Construction’s efficient management, access to quality materials at competitive prices, and expertise in avoiding costly mistakes save clients money.
## Highlight Projects
On Group Remodeling & Construction has an impressive portfolio showcasing a variety of successful projects. Some of their
highlight projects include:
Corporate Offices: They have transformed numerous office spaces, creating modern, functional environments that enhance productivity and employee satisfaction.
Retail Spaces: Their work in retail includes designing and building stores that attract customers and provide an excellent shopping experience.
Healthcare Facilities: On Group has constructed and renovated healthcare facilities, ensuring they meet stringent health and safety standards while providing a comfortable environment for patients and staff.
Educational Institutions: They have built and remodeled schools and universities, creating conducive learning environments with modern amenities.
## Innovation and Sustainability
On Group Remodeling & Construction is committed to innovation and sustainability. They incorporate the latest construction technologies and sustainable practices to deliver projects that are not only functional and beautiful but also environmentally friendly. Their focus on sustainability includes using eco-friendly materials, implementing energy-efficient designs, and minimizing waste.
**Conclusion**
For businesses in Dallas looking to transform their commercial spaces, [On Group Remodeling & Construction](https://ongroupconstructions.com/) stands out as the premier choice among Dallas commercial general contractors. Their extensive experience, comprehensive services, client-centric approach, and commitment to quality make them the go-to contractor for any commercial construction or remodeling project. Whether you’re planning a renovation, new build, or a complete overhaul of your commercial space, On Group Remodeling & Construction has the expertise and dedication to bring your vision to life.
| ongroup_construction_3870 | |
1,891,903 | [Flutter] 앱 시작 로딩화면 App loading page | flutter_native_splash https://pub.dev/packages/flutter_native_splash. 패키지 다운로드(https://pub.dev)... | 0 | 2024-06-18T04:12:52 | https://dev.to/sidcodeme/flutter-aeb-sijag-rodinghwamyeon-app-loading-page-kbf | flutter, developer, app, loadingpage | 0. flutter_native_splash
https://pub.dev/packages/flutter_native_splash.
1. 패키지 다운로드(https://pub.dev)
Package download from (https://pub.dev)
- flutter_native_splash
```shell
flutter pub add flutter_native_splash
```
2. flutter_native_splash.yaml
- pubspec.yaml과 동일 경로에 파일 생성
- smae path to pubspec.yaml
- vi또는 메모장등으로 원하는 색상 이미지를 원하는대로 수정
- "vi" or "notepad" edit what you want color and image whatever.
```yaml
fflutter_native_splash:
color: "#009000"
image: assets/Kaaba.png
branding: assets/Kaaba.png
# color_dark: "#121212"
# image_dark: assets/Kaaba.png
# branding_dark: assets/Kaaba.png
android_12:
image: assets/Kaaba.png
icon_background_color: "#009000"
# image_dark: assets/Kaaba.png
# icon_background_color_dark: "#121212"
web: false
```
3. command on prompt
```shell
dart run flutter_native_splash:remove && dart run flutter_native_splash:create
```
4. main.dart
```dart
Future<void> main() async {
runApp(const WhereIsKaaba());
# close splash screen
FlutterNativeSplash.remove();
}
```
finished!! | sidcodeme |
1,891,901 | Mastering Distributed Systems: Essential Design Patterns for Scalability and Resilience | Introduction In the realm of modern software engineering, distributed systems have become... | 0 | 2024-06-18T03:56:59 | https://dev.to/tutorialq/mastering-distributed-systems-essential-design-patterns-for-scalability-and-resilience-35ck | distributedsystems, scalability, resiliency, designpatterns | ## Introduction
In the realm of modern software engineering, distributed systems have become pivotal in achieving scalability, reliability, and high availability. However, designing distributed systems is no trivial task; it requires a deep understanding of various design patterns that address the complexities inherent in distributed environments. This article delves into the best practices and design patterns essential for architecting robust and scalable distributed systems.
## Table of Contents
1. [Understanding Distributed Systems](#understanding-distributed-systems)
2. [Key Challenges in Distributed Systems](#key-challenges-in-distributed-systems)
3. [Essential Design Patterns](#essential-design-patterns)
- [Client-Server Pattern](#client-server-pattern)
- [Master-Slave Pattern](#master-slave-pattern)
- [Broker Pattern](#broker-pattern)
- [Peer-to-Peer Pattern](#peer-to-peer-pattern)
- [Microservices Pattern](#microservices-pattern)
- [Event-Driven Pattern](#event-driven-pattern)
- [CQRS Pattern](#cqrs-pattern)
- [Saga Pattern](#saga-pattern)
4. [Best Practices](#best-practices)
5. [Conclusion](#conclusion)
## Understanding Distributed Systems
Distributed systems consist of multiple autonomous computers that communicate through a network to achieve a common goal. These systems are characterized by their ability to distribute computation and data across multiple nodes, leading to enhanced performance, fault tolerance, and scalability.
In a typical distributed system, each node performs a subset of tasks, and the overall system functions cohesively to provide a unified service. Examples include cloud computing platforms, microservices architectures, and large-scale data processing systems like Hadoop and Spark.
## Key Challenges in Distributed Systems
Designing distributed systems involves addressing several challenges:
- **Network Reliability:** Network failures are inevitable, and systems must be designed to handle them gracefully.
- **Data Consistency:** Ensuring consistency across distributed nodes is complex and often requires trade-offs as per the CAP theorem.
- **Scalability:** Systems must efficiently scale out to handle increasing loads without significant performance degradation.
- **Latency:** Minimizing latency in communication between distributed components is crucial for performance.
- **Security:** Ensuring secure communication and data storage across distributed components is essential.
## Essential Design Patterns
### Client-Server Pattern
**Overview:**
The Client-Server pattern is a foundational design where clients request services, and servers provide them. This pattern is prevalent in web applications, network services, and many other systems where centralization of certain functionalities is beneficial.
**Example:**
Consider a typical web application. The user's browser acts as the client, sending HTTP requests to a web server, which processes these requests, interacts with a database if needed, and sends back the appropriate HTTP responses.
**Pros:**
- Simplifies client logic.
- Centralized control over resources.
- Easier to maintain and update the server without affecting clients directly.
**Cons:**
- Single point of failure (server).
- Scalability challenges as the number of clients increases.
- Potential bottleneck at the server.
**In-Depth Analysis:**
The Client-Server pattern excels in environments where centralizing the logic on the server is advantageous. For instance, in financial systems where security and data integrity are paramount, keeping sensitive computations on the server reduces the risk of client-side tampering. However, the pattern’s centralized nature means the server must be robust, often requiring load balancing, failover strategies, and redundancy to avoid downtime and performance issues as client numbers grow.
### Master-Slave Pattern
**Overview:**
In the Master-Slave pattern, the master node distributes tasks to multiple slave nodes and aggregates their results. It is suitable for parallel processing and tasks that can be easily divided into smaller subtasks.
**Example:**
Database replication is a common use case where the master database handles write operations, ensuring consistency, while slave databases handle read operations, improving performance and availability.
**Pros:**
- Efficient parallel processing.
- Load distribution.
- Simplifies the master node's task by delegating read operations to slaves.
**Cons:**
- Single point of failure (master).
- Complexity in managing data synchronization between master and slaves.
- Potential latency in synchronizing updates.
**In-Depth Analysis:**
The Master-Slave pattern is effective in scenarios requiring high read throughput and low write latency. For instance, in large-scale e-commerce platforms, this pattern can help segregate transaction processing (writes) and query processing (reads), ensuring both operations are optimized. However, the pattern's reliance on the master node necessitates robust failover mechanisms and real-time synchronization protocols to maintain data consistency and availability during master node failures.
### Broker Pattern
**Overview:**
The Broker pattern involves decoupling clients and servers through a broker that coordinates communication. This pattern is effective for scalable and maintainable systems where interactions between components are complex.
**Example:**
Message brokers like RabbitMQ or Apache Kafka are quintessential examples. Clients publish messages to the broker, which then routes these messages to the appropriate server consumers.
**Pros:**
- Decouples client and server.
- Facilitates scalability and flexibility.
- Enables asynchronous communication.
**Cons:**
- Additional latency due to the broker.
- Complexity in broker management and configuration.
- Potential bottleneck at the broker.
**In-Depth Analysis:**
The Broker pattern excels in environments where decoupling is crucial for scalability and maintainability. In microservices architectures, for instance, using a broker for inter-service communication ensures services remain loosely coupled, allowing independent scaling and deployment. This pattern also supports complex routing logic and load balancing, making it suitable for real-time analytics and IoT systems where data flows from numerous sources to multiple processing units.
### Peer-to-Peer Pattern
**Overview:**
Each node in a peer-to-peer (P2P) network acts as both a client and a server. This pattern is used in decentralized systems where resources are shared among peers without a central authority.
**Example:**
File sharing systems like BitTorrent exemplify this pattern. Each peer downloads and uploads parts of files, contributing to the network’s overall efficiency and resilience.
**Pros:**
- High fault tolerance.
- Scalability.
- Resource sharing among peers.
**Cons:**
- Complexity in maintaining data consistency.
- Security vulnerabilities due to decentralized nature.
- Potential for uneven load distribution.
**In-Depth Analysis:**
The Peer-to-Peer pattern is advantageous in applications requiring decentralized control and high fault tolerance. In blockchain networks, for instance, each node (peer) maintains a copy of the ledger, ensuring data redundancy and resilience against node failures. The pattern’s decentralized nature, however, necessitates sophisticated algorithms for consensus, data integrity, and load balancing to ensure the network operates efficiently and securely.
### Microservices Pattern
**Overview:**
This pattern involves decomposing applications into small, loosely coupled services. Each service is independently deployable and scalable, typically communicating over lightweight protocols like HTTP or messaging queues.
**Example:**
An online retail platform might separate its functionalities into microservices such as user authentication, product catalog, order processing, and payment handling.
**Pros:**
- Independent scalability.
- Improved fault isolation.
- Flexibility in using different technologies for different services.
**Cons:**
- Complexity in managing inter-service communication.
- Challenges in ensuring data consistency across services.
- Increased operational overhead.
**In-Depth Analysis:**
The Microservices pattern is essential for developing cloud-native applications. Each service's autonomy allows teams to deploy, scale, and update services independently, fostering rapid development and innovation. However, microservices architectures require robust service discovery, load balancing, and distributed tracing mechanisms to manage the increased complexity of inter-service interactions and ensure overall system coherence.
### Event-Driven Pattern
**Overview:**
In this pattern, systems react to events, enabling asynchronous communication between components. It is ideal for systems requiring high decoupling and scalability.
**Example:**
A stock trading platform where price updates and trade executions trigger events that various services process independently, such as notification services, analytics, and logging.
**Pros:**
- High decoupling.
- Scalability and flexibility.
- Real-time processing capabilities.
**Cons:**
- Debugging challenges.
- Eventual consistency issues.
- Complexity in managing event flows.
**In-Depth Analysis:**
The Event-Driven pattern is particularly effective in real-time systems and applications requiring high responsiveness. In IoT ecosystems, for instance, sensors generate events that trigger actions across various services, such as data analysis, alerting, and device control. The pattern's asynchronous nature enhances scalability but necessitates careful design of event schemas, idempotent processing, and consistency guarantees to ensure system reliability and predictability.
### CQRS Pattern
**Overview:**
Command Query Responsibility Segregation (CQRS) separates the read and write operations into different models. It is useful for systems with complex querying requirements and distinct performance characteristics for reads and writes.
**Example:**
An e-commerce platform might use CQRS to handle high-frequency queries for product information (read model) and separate write operations for orders and inventory updates (write model).
**Pros:**
- Optimized read and write operations.
- Scalability.
- Enhanced security by segregating read and write permissions.
**Cons:**
- Increased complexity.
- Data synchronization challenges.
- Potential for eventual consistency.
**In-Depth Analysis:**
The CQRS pattern is beneficial in systems where read and write workloads differ significantly. In financial trading systems, for example, trade execution (writes) and portfolio reporting (reads) have distinct performance and consistency requirements. CQRS enables optimizing these operations independently, but requires sophisticated data synchronization mechanisms to ensure eventual consistency and coherent state representation across the read and write models.
### Saga Pattern
**Overview:**
The Saga pattern manages long-running transactions in microservices, ensuring data consistency across distributed services through a series of compensating transactions.
**Example:**
A travel booking system where booking a flight, hotel, and car rental are separate transactions. If one service fails, the Saga pattern ensures previously completed transactions are rolled back or compensated.
**Pros:**
- Ensures data consistency.
- Handles complex transactions.
- Enables long-running business processes.
**Cons:**
- Increased complexity in transaction management.
- Error handling can be challenging.
- Requires careful design of compensating actions.
**In-Depth Analysis:**
The Saga pattern is vital for maintaining data consistency in distributed transactions that span multiple services. In e-commerce checkout processes, for example, a saga can manage steps such as payment processing, inventory reservation, and shipping arrangements. If any step fails, compensating transactions (e.g., refunding payment, restocking inventory) ensure system integrity. Designing effective sagas requires thorough understanding of the business process, meticulous error handling, and comprehensive logging to trace and manage the transaction lifecycle.
## Best Practices
- **Design for Failure:** Assume components will fail and design systems to handle these failures gracefully. Implement redundancy, failover mechanisms, and automated recovery processes.
- **Consistent Hashing:** Use consistent hashing for efficient load balancing and fault tolerance, particularly in distributed data stores and cache systems.
- **Idempotent Operations:** Ensure operations are idempotent to handle retries safely, preventing unintended side effects.
- **Rate Limiting:** Implement rate limiting to protect against overload and abuse, ensuring system stability under high load.
- **Monitoring and Logging:** Employ comprehensive monitoring and logging to detect and diagnose issues promptly. Use tools like Prometheus, Grafana, and ELK stack for real-time insights and alerting.
- **Security Best Practices:** Ensure secure communication, authentication, and authorization across distributed components. Use encryption, secure APIs, and regular security audits.
## Conclusion
Designing distributed systems is a complex yet rewarding endeavor. By leveraging the right design patterns and adhering to best practices, engineers can build systems that are robust, scalable, and resilient. Understanding and applying these principles is crucial for the success of modern distributed applications. This in-depth exploration of design patterns and best practices provides a solid foundation for tackling the challenges of distributed system architecture. | tutorialq |
1,891,899 | enlio vietnam | Enlio là thương hiệu hàng đầu thế giới về sản xuất thảm sàn thể thao, đặc biệt là thảm cầu lông. Với... | 0 | 2024-06-18T03:54:45 | https://dev.to/hsenliovietnam/enlio-vietnam-26e4 | Enlio là thương hiệu hàng đầu thế giới về sản xuất thảm sàn thể thao, đặc biệt là thảm cầu lông. Với uy tín và chất lượng đã được kiểm chứng qua việc tài trợ và cung cấp thảm cho nhiều giải đấu cầu lông quốc tế lớn, Enlio khẳng định vị thế là đối tác tin cậy của các vận động viên và tổ chức thể thao chuyên nghiệp.
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Với công nghệ sản xuất tiên tiến và vật liệu chất lượng cao, Enlio cam kết mang đến những sản phẩm thảm sàn thể thao an toàn, thân thiện với môi trường và có tuổi thọ cao. Thương hiệu không ngừng nỗ lực cải tiến và phát triển để đáp ứng nhu cầu ngày càng cao của khách hàng, đồng thời đóng góp vào sự phát triển của ngành thể thao thế giới.
Website:https://enlio.vn/
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| hsenliovietnam | |
1,891,896 | Directory Structure : Selenium Automation | if you are using selenium webdriver , to write automation tests for your javascript application ,... | 0 | 2024-06-18T03:47:11 | https://dev.to/parthkamal/directory-structure-selenium-automation-52ic | automation, testing, javascript, selenium | if you are using selenium webdriver , to write automation tests for your javascript application , tracing the requirement , and writing functional tests for it , may end up getting a lot of tests, and each set of tests, may become very difficult to manage, because we have to write code for each ui interaction in each test.
soon you will find that managing test code is in itself a big task. soon you will start finding ways to modularize tests in selenium .
modularizing tests in selenium webdriver in javascript , involved organinizing your test code into reusable, maintainable and scalable components.
some of the common practices which are used to modularize are;
1. page object model - pom is a desing pattern that helsps to create an object repository for web ui elements.
2. test data management - keep your test data separate from your test scripts.
3. utility functions - for common actions across the whole ui lik , logging in , taking screenshots, or waiting for elements.
4. test suites - here we will write the code for tests.
5. configuration - config files to manage, the environment variables, global variables, and configuration, which are common across all the tests, for eg; base url.
6. logging and reporting - integrating loggign and reporting to keep track of test execution and results. | parthkamal |
1,891,895 | Protect Your Shipments with Cardboard Boxes, Mailing Bags, Paper Bags, and Padded Envelopes | Effective shipping relies on the right packaging materials. Cardboard boxes are excellent for sturdy... | 0 | 2024-06-18T03:47:09 | https://dev.to/adnan_jahanian/protect-your-shipments-with-cardboard-boxes-mailing-bags-paper-bags-and-padded-envelopes-2n8o | Effective shipping relies on the right packaging materials. Cardboard boxes are excellent for sturdy protection, making them perfect for diverse items in storage or transport. Mailing bags offer a lightweight, durable solution for securely sending documents and smaller goods. Paper bags, combining strength with eco-friendliness, are ideal for everyday packaging needs. Padded envelopes provide essential cushioning for fragile items, preventing damage during transit. Together, these packaging solutions protect your items and ensure efficient delivery.
**Cardboard Boxes: The Reliable All-Rounder**
[Cardboard boxes](https://mrbags.co.uk/collections/cardboard-boxes) are essential for both personal and business use. These boxes offer a robust and dependable way to transport or store items securely. Whether you’re moving to a new home, mailing a package, or organising seasonal decorations, cardboard boxes are the ideal choice. Available in numerous sizes and strengths, you can easily find the perfect box to meet your requirements.
The primary advantage of cardboard boxes is their strength. Constructed from thick paperboard, they provide exceptional protection against impacts during transit. This makes them perfect for shipping items that need extra care, such as electronics, books, or fragile decorations.
Furthermore, cardboard boxes are an eco-friendly option. Most are manufactured from recycled materials and are themselves recyclable, contributing to a reduced carbon footprint. Businesses can also personalise these boxes with logos and designs, enhancing their professional image and brand recognition
**Postage Bags: Convenient and Cost-Effective**
For sending smaller items through the mail, postage bags are an excellent choice. These bags are lightweight yet durable, offering adequate protection for your items without adding unnecessary weight. They are perfect for sending documents, clothing, or other non-fragile items. The self-sealing feature of postage bags makes them both convenient and secure.
[Postage bags](https://mrbags.co.uk/collections/postage-bags) come in a range of sizes, allowing you to select the ideal one for your items. They are often made from strong plastic materials that withstand the rigours of postal handling. Their lightweight nature means they don’t significantly increase shipping costs, making them a cost-effective solution for frequent senders.
Additionally, postage bags can be either opaque or transparent. Opaque bags provide privacy for sensitive documents, while transparent ones are great for showcasing items in retail settings. Some postage bags even feature padded interiors for added protection, ensuring your items arrive safely.
**Mailing Bags: Extra Security for Delicate Items**
Mailing bags, similar to postage bags, are designed for sending items through the post. However, they often include additional protective features, such as bubble wrap linings, making them ideal for more delicate items. Available in various sizes, mailing bags can be customised with your branding, adding a professional touch to your deliveries.
[Mailing bags](https://mrbags.co.uk/collections/mailing-bags) are particularly useful for shipping items like jewellery, cosmetics, or small electronic gadgets. The bubble wrap interior absorbs shocks and prevents damage during transit. This is especially important for businesses aiming to maintain high customer satisfaction by ensuring their products arrive in perfect condition.
Moreover, mailing bags can be tamper-evident, providing extra security. This is crucial for sending valuable or sensitive items. The tear-resistant materials used in many mailing bags also deter theft and ensure that the contents remain intact until they reach their destination.
**Party Bags: Making Celebrations Memorable**
[Party bags](https://mrbags.co.uk/collections/paper-bags/products/paper-bags-with-handles) are a delightful way to conclude any celebration. Whether it's a child's birthday party, a wedding, or any festive gathering, party bags filled with treats and small gifts are always appreciated. They come in various designs and colours, allowing you to match the theme of your event. Personalising party bags with names or messages can add a special touch.
Creating party bags can be an enjoyable and creative process. Fill them with sweets, toys, personalised gifts, or homemade treats. The possibilities are endless, and you can tailor the contents to suit the preferences of your guests. Party bags serve as tokens of appreciation, extending the joy of the event beyond its duration.
Additionally, party bags can be themed according to the occasion. For instance, wedding party bags might include mini bottles of champagne, scented candles, or customised trinkets. For children's parties, you could include colouring books, stickers, and small toys. Themed party bags add an extra layer of excitement and can leave a lasting impression on your guests.
**Paper Bags: Eco-Friendly and Versatile**
[Paper bags](https://mrbags.co.uk/collections/paper-bags) are a versatile and environmentally friendly packaging option. From carrying groceries to serving as gift bags, they are both practical and stylish. Available in various sizes, colours, and designs, paper bags are perfect for any occasion. They can be easily decorated, making them an excellent choice for personalised gifts or party favours.
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Paper bags also offer a charming and rustic aesthetic. They can be easily customised with stamps, stickers, or handwritten messages, adding a personal touch to your packaging. For businesses, branding paper bags with your logo or design can enhance your brand image and make your products stand out.
Moreover, paper bags are sturdy and capable of holding a variety of items. They are perfect for carrying groceries, books, clothing, and more. Reinforced handles and bases ensure that paper bags can support heavier items without tearing, making them a reliable packaging option.
**Why Choose MrBags.co.uk?**
For all your packaging needs, look no further than MrBags.co.uk. As the best and most affordable supplier, they offer a wide range of products, including cardboard boxes, postage bags, mailing bags, party bags, and paper bags. With no minimum order requirement and next-day delivery, MrBags.co.uk ensures that you get what you need, when you need it, without breaking the bank.
[Mr Bags](https://mrbags.co.uk/) stands out for its commitment to quality and customer satisfaction. Their extensive selection of packaging solutions caters to a variety of needs, from everyday use to special occasions. Each product is carefully designed to offer maximum protection and convenience, ensuring that your items are safe and secure.
The no minimum order policy is particularly beneficial for small businesses and individuals who don’t need to buy in bulk. This flexibility allows you to purchase exactly what you need, reducing waste and saving costs. The next-day delivery service ensures that you receive your packaging materials promptly, so you can get on with your tasks without delay.
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| adnan_jahanian | |
1,891,893 | Doodle: The Only Choice for Interactive and Animated Art | The realm of AI art creation is booming, offering artists a spectrum of tools to bring their visions... | 0 | 2024-06-18T03:42:34 | https://dev.to/gptconsole/doodle-the-only-choice-for-interactive-and-animated-art-f98 |
The realm of AI art creation is booming, offering artists a spectrum of tools to bring their visions to life. One such tool, Doodle, the AI agent from GPTConsole, stands out for its unique focus on interactive and animated art. However, before diving in, let's explore the creative landscape to see if Doodle is truly the "only choice" or the perfect fit for your artistic desires.
**Where Doodle Shines: The Power of Interaction**
Doodle excels in fostering an interactive art experience. Unlike some competitors that generate static images, Doodle breathes life into your creations with animations. Imagine describing a scene of a bustling city at night. With Doodle, you witness the twinkling lights, the movement of cars, and the energy of the cityscape unfold before your eyes.
This interactivity extends beyond the initial creation. Doodle allows you to refine your artwork with further prompts. Suppose your city scene lacks a vibrant park. With Doodle, you can add one, complete with playful children and a majestic fountain. This iterative process allows you to sculpt your vision into a masterpiece, fostering a sense of creative collaboration with the AI.
**Beyond Animation: Exploring the Art Spectrum**
While Doodle's animation capabilities are impressive, it's important to acknowledge that other AI art tools excel in different areas. Some tools specialize in generating incredibly realistic images, perfect for capturing the beauty of a mountain landscape or the intricate details of a historical artifact. Others might focus on creating unique artistic styles, allowing you to explore the world of abstract art or impressionism.
**The Right Tool for the Job: Finding Your Creative Fit**
Ultimately, the "best" AI art tool depends on your artistic goals. Do you crave dynamic animations to bring your stories to life? Then Doodle might be the perfect fit. However, if you seek high-fidelity realism or artistic exploration in different styles, other tools might be better suited to your needs.
**Doodle collective: A Springboard for Inspiration**
Even if Doodle isn't your sole choice, it offers a valuable resource: Doodle collective. This free platform showcases a vibrant collection of animated creations by other users. Here, you can discover a multitude of artistic styles and approaches, sparking inspiration for your own artistic end eavors, regardless of the tool you choose.
**Prompts to Spark Your Interactive Adventure with Doodle:**
**Prompt:** Doodle a mischievous group of pirates sailing on a rainbow-coloured ship.
**Result:**[Link](https://doodle.gptconsole.ai/9606dc32-e8de-4533-bebf-8ad93a79bab8)
**Prompt:** Doodle a friendly robot building a magnificent sandcastle on Mars.
**Result:**[Link](https://doodle.gptconsole.ai/a2d59718-5530-4870-9d99-94672be2fbda)
**Prompt:** Doodle a majestic dragon soaring through the clouds, leaving a trail of sparkling stardust.
**Result:**[Link](https://doodle.gptconsole.ai/759ea804-d1b1-48dd-8256-c241f2665944)
**The Final Brushstroke: Unleashing Your Creativity**
The world of AI art creation is vast and ever-evolving. Doodle offers a compelling option for those seeking interactive and animated art. However, the key lies in understanding the strengths of various tools and choosing the one that best aligns with your artistic vision. So, explore, experiment, and let your creativity take flight!
| vincivinni | |
1,891,890 | HTML - 5 API's | HTML5 introduced several new APIs (Application Programming Interfaces) that extend the capabilities... | 0 | 2024-06-18T03:39:50 | https://dev.to/kiransm/html5-apis-1dbb | webdev, javascript, programming, tutorial | HTML5 introduced several new APIs (Application Programming Interfaces) that extend the capabilities of web browsers, enabling developers to create richer and more interactive web applications without relying on third-party plugins like Flash or Java. Here are some key HTML5 APIs:
### 1. Canvas API
- **Description**: Provides a way to draw graphics, animations, and other visualizations on the fly using JavaScript.
- **Use Cases**: Creating games, data visualizations, image manipulation, and interactive animations.
### 2. Web Audio API
- **Description**: Enables web applications to process and synthesize audio in real-time using JavaScript. It provides a powerful set of tools for audio processing and manipulation.
- **Use Cases**: Building audio players, creating music applications, implementing audio effects, and generating soundscapes.
### 3. Web Storage API (localStorage and sessionStorage)
- **Description**: Allows web applications to store data locally on the user's device. `localStorage` stores data persistently, while `sessionStorage` stores data for the duration of a session.
- **Use Cases**: Storing user preferences, caching data for offline use, implementing shopping carts, and saving form data.
### 4. Web Workers API
- **Description**: Enables multi-threaded JavaScript execution in web applications by running scripts in the background without blocking the UI thread.
- **Use Cases**: Performing CPU-intensive tasks, such as data processing, image manipulation, and calculations, without affecting the responsiveness of the user interface.
### 5. WebSockets API
- **Description**: Provides a full-duplex communication channel over a single, long-lived connection between a client and a server, enabling real-time bidirectional communication.
- **Use Cases**: Building real-time chat applications, multiplayer games, collaborative editing tools, and live data streaming applications.
### 6. Geolocation API
- **Description**: Allows web applications to access the device's geographical location information (latitude and longitude) using GPS, Wi-Fi, or cellular data.
- **Use Cases**: Implementing location-based services, mapping applications, weather forecasts, and local search functionality.
### 7. Drag and Drop API
- **Description**: Provides support for dragging and dropping elements within a web page or between different applications.
- **Use Cases**: Creating drag-and-drop interfaces, file upload widgets, and interactive user interfaces.
### 8. WebRTC API
- **Description**: Enables real-time communication (voice, video, and data) directly between web browsers without the need for plugins or third-party software.
- **Use Cases**: Building video conferencing applications, peer-to-peer file sharing, screen sharing, and online gaming platforms.
### 9. IndexedDB API
- **Description**: A low-level API for client-side storage of large amounts of structured data, providing a way to store and retrieve data locally using JavaScript.
- **Use Cases**: Implementing offline web applications, managing large datasets, and caching frequently accessed data.
### 10. FileReader API
- **Description**: Allows web applications to read the contents of files (e.g., images, text files, audio files) selected by the user using file input elements.
- **Use Cases**: Uploading files asynchronously, processing files locally before uploading, and building file management applications.
These are just a few examples of the many HTML5 APIs available to web developers. Each API provides unique functionality that can enhance the user experience and enable the creation of sophisticated web applications. | kiransm |
1,891,889 | Stepping into Storage: A Guide to Creating an S3 Bucket and Uploading Files on AWS | Hi DEV Community 👋 ! I'm so excited to discuss one of my favorite foundational aspects of computing-... | 0 | 2024-06-18T03:39:01 | https://dev.to/techgirlkaydee/stepping-into-storage-a-guide-to-creating-an-s3-bucket-and-uploading-files-on-aws-2624 | aws, s3, cloudcomputing, storage | Hi DEV Community 👋 ! I'm so excited to discuss one of my favorite foundational aspects of computing- **STORAGE!**
**[Amazon Simple Storage Service (S3)](https://aws.amazon.com/s3/)** is a scalable object storage service widely used for storing and retrieving any amount of data. Whether you're hosting a static website, storing backups, or logging data, S3 provides a robust and flexible solution. In this guide, I'll walk you through the steps to create your first S3 bucket.
## **Prerequisites**
Before you start, you'll need:
1.. An AWS account. If you don't have one, you can sign up for free [here](https://signin.aws.amazon.com/signup?request_type=register).
2.. AWS Management Console access.
## **Step 1: Sign in to the AWS Management Console**
1.. Go to the [AWS Management Console](https://aws.amazon.com/console/).
2.. Sign in with your AWS account credentials.
## **Step 2: Open the S3 Service**
1.. In the AWS Management Console, type "S3" in the search bar at the top and select "S3" from the drop-down list.
2.. This will take you to the Amazon S3 dashboard.
## **Step 3: Create a New S3 Bucket**
1.. On the S3 dashboard, click on the "Create bucket" button.
## **Step 4: Configure the Following Bucket Settings**
1.. Bucket Name: Enter a unique name for your bucket. The name must be globally unique across all existing bucket names in S3.
- _Example: my-unique-bucket-name-12345_
2.. Region: Select the AWS Region where you want the bucket to be created. Choose a region close to your primary user base to reduce latency and costs.
- _Example: US East (N. Virginia)_
3.. Bucket Settings for Object Ownership: By default, new buckets have the "ACLs disabled" option selected, meaning the bucket owner has full control over the objects.
4.. Block Public Access Settings: For most use cases, it’s recommended to block all public access. However, if you need public access for web hosting or other reasons, you can adjust these settings.
- _Example: Leave "Block all public access" checked for a private bucket._
5.. Bucket Versioning: Enable versioning if you want to keep multiple versions of an object in the same bucket. This is useful for data backup and recovery.
- _Example: You can leave it disabled for now and enable it later if needed._
6.. Tags: You can add tags (key-value pairs) to your bucket to help with cost allocation and management.
7.. Default Encryption: Enable default encryption if you want all objects stored in this bucket to be automatically encrypted.
- _Example: Enable server-side encryption with Amazon S3 managed keys (SSE-S3)._
## **Step 5: Review and Create the Bucket**
1.. Review your settings to ensure everything is configured correctly.
2.. Click the "Create bucket" button at the bottom of the page.
## **Step 6: Upload Files to Your S3 Bucket**
1.. Once the bucket is created, you'll be redirected back to the S3 dashboard.
2.. Click on the "Upload" button.
**Add Files**
1.. Click "Add files" and select the files you want to upload from your local machine.
2.. Optionally, you can add entire folders by clicking "Add folder."
**Set Permissions**
1.. By default, the files will be private. If you need to make them public, adjust the permissions accordingly. However, for most cases, keeping the default private setting is recommended.
**Set Properties**
1.. You can configure various properties like storage class, encryption, and metadata. For now, you can leave these at their default settings.
**Review and Upload**
1.. Review your settings and click "Upload" to start the upload process.
## **Congratulations!**
You've successfully created an S3 bucket and uploaded files. Amazon S3 is a powerful tool for storing and managing data in the cloud, and mastering these basics will help you leverage its full potential.
Please share your feedback on this guide by commenting below. I'm looking forward to sharing more AWS content and engaging with the cloud community. Until next time ✌️! | techgirlkaydee |
1,891,888 | lets-have-fun-with-console-in-javascript ❤ | console.table const users = [ {id:1,name:'WDE'}, ... | 0 | 2024-06-18T03:37:57 | https://dev.to/aryan015/lets-have-fun-with-console-in-javascript-13bd | react, javascript, vue | ## console.table
```js
const users = [
{id:1,name:'WDE'},
{id:2}
]
console.log(users)
```
`output`
|(index)|id|name|
|--|--|--|
|0|1|WDE|
|1|2||
## console.time
estimate time complexity of a program in ms🤣
```js
console.log('fetching')
fetch('url').then(()=>{
//awaiting response
console.timeEnd('fetched') //fetched:0ms
})
```
## console.dir
will display all property related to that datatype
```js
const obj = {
name:'aryan',
age:26
}
console.dir(obj);
```
`output1`
```js
Object {name:'aryan',age:21}
```
`output2`
## console.trace
It will display call stack in decending order. last executed to firstly executed.
```js
function foo(){
function boo(){
//do something
console.trace() // start tracing
}
boo();
}
// boo
// foo
// anonymous
```
## console.assert
The `console.assert()` static method writes an error message to the console if the assertion is false. If the assertion is true, nothing happens.
```syntax
console.log(condition,error)
```
```js
console.assert(0===1,'not true')
```
`ps: i dnot know use of this🤣`
## console.count
```js
function fun(x){
console.count(x);
}
//count the number of fun runs
fun('hi')
fun('hi')
fun('hi')
fun('hi')
```
`output`
```js
'hi': 4
```
## clean the console.clear() 🤣
```js
console.log('pre written message')
console.clear() // hey javascript clear all prev message
console.log('new messages aryan')
```
## list in console.group()
`output`
```js
do this
step1:follow
step2:like
```
`code`
```js
console.group('do this')
console.log('setp1:follow')
console.log('setp2:like')
console.groupEnd() //reset
```
post-credit:[@code4git](https://www.linkedin.com/in/aryan-khandelwal-779b5723a/)
## learning resources
[🧡Scaler - India's Leading E-learning](www.scaler.com)
[🧡w3schools - for web developers](www.w3school.com) | aryan015 |
1,891,863 | Mastering Git-flow development approach: A Beginner’s Guide to a Structured Workflow | Git is a powerful tool for version control, but it can be overwhelming for beginners. The Git Flow... | 27,814 | 2024-06-18T03:25:36 | https://dev.to/andresordazrs/mastering-git-flow-development-approach-a-beginners-guide-to-a-structured-workflow-31eo | git, beginners, developer, gitflow | Git is a powerful tool for version control, but it can be overwhelming for beginners. The Git Flow development approach is a branching model that brings structure and clarity to your workflow, making it easier to manage your projects. In this article, we’ll explain what Git Flow development approach is, how it works, and when to use it.
## **What is Git-flow development approach?**
Is a branching model for Git created by Vincent Driessen. It provides a clear set of guidelines for managing your project’s branches, ensuring a consistent and efficient workflow. Git Flow defines several types of branches, each with a specific purpose.
## **Main Branches**
1. **_master_ Branch:** This branch contains the production-ready code. Only stable and tested code should be merged into **_master_**.
2. **_develop_ Branch:** This branch is where the latest development changes are integrated. It serves as a staging area for all new features and bug fixes.
## **Supporting Branches**
1- **Feature Branches (_feature_/*):**
- Created from develop.
- Used for developing new features.
- Merged back into develop once the feature is complete.
**Example:**
```
git checkout develop
git checkout -b feature/new-feature
```
2- **Release Branches (_release_/*):**
- Created from develop.
- Used to prepare for a new production release.
- Allows for final testing and bug fixing.
- Merged into both master and develop once ready.
**Example:**
```
git checkout develop
git checkout -b release/v1.0.0
```
3- **Hotfix Branches (_hotfix_/*):**
- Created from master.
- Used to quickly fix production issues.
- Merged into both master and develop once the fix is complete.
**Example:**
```
git checkout master
git checkout -b hotfix/urgent-fix
```
4- **Bugfix Branches (_bugfix_/*):**
- Similar to feature branches but specifically for fixing bugs.
- Can branch off develop or a release branch.
**Example:**
```
git checkout develop
git checkout -b bugfix/bug-123
```
## **Benefits of Git Flow development approach**
- **Structured Workflow:** Git Flow provides a clear, structured workflow that makes it easier to manage large projects with multiple contributors.
- **Parallel Development:** Developers can work on features, bug fixes, and releases simultaneously without interfering with each other.
- **Release Management:** Simplifies the release management process by separating development and release preparation stages.
- **Quick Fixes:** Allows for quick and isolated fixes to production issues with hotfix branches.
## **Considerations**
- **Complexity:** Git Flow can be more complex than simpler workflows, which might be overkill for small projects.
- **Learning Curve:** It requires team members to understand and follow the branching model strictly.
In conclusion, The Git Flow development approach is a robust and effective way to manage the development lifecycle of projects, especially those with multiple developers and complex release cycles. By providing a clear and structured workflow, Git Flow helps ensure that your project remains stable, organized, and easy to maintain.
Happy coding! | andresordazrs |
1,891,874 | Automate the renewal of a Let's Encrypt Certiticate with AWS Batch and Docker | Scenario Certbot it's not currently installed in the web server so the certificate is... | 0 | 2024-06-18T03:25:02 | https://dev.to/vanevargas/automate-the-renewal-of-a-lets-encrypt-certiticate-with-aws-batch-and-docker-327c | aws, learning, devops | ## Scenario
* Certbot it's not currently installed in the web server so the certificate is generated somewhere else then copied to the web server
* The Route53 DNS method is currently used to manually renew the certificate
* The Route53 domain already existed so it doesn't need to be created
* Little to no maintenance after deployment of new infrastructure
## Technologies used
A short description of the technoligies used.
1. **Docker**
* Use a [docker container](https://hub.docker.com/r/certbot/dns-route53/tags) with certbot and the dns-route53 plugin installed.
* Below is the command used to locally test the container:
```
docker run --rm -it --env AWS_ACCESS_KEY_ID=ACCESS_KEY --env AWS_SECRET_ACCESS_KEY=SECRET_KEY -v "/c/letsencrypt:/etc/letsencrypt" certbot/dns-route53 certonly --dns-route53 -d DOMAIN.COM -m EMAIL@TEST.COM --agree-tos --non-interactive --server https://acme-v02.api.letsencrypt.org/directory
```
2. **AWS Batch and EFS**
* AWS Batch Jobs can be used to create on-demand Fargate instances to run the Docker container.
* The problem is how to move the certificates created out of the container. The solution is to mount an EFS volume.
* The creation/management of the ECS clusters, tasks, tasks definitions is transparent to the user, everything is done in AWS Batch.
* In summary (in the AWS Batch console), first you need to create a "Compute Environment", then a "Job Queue" and finally a "Job Definition". After that, you can run Jobs selecting the proper Job Definition and Queue.
* The video used to get a general idea on how AWS Batch works:
* [Batch can now use Fargate for a truly serverless experience](https://www.youtube.com/watch?v=weKeR-qg_-4)
3. **AWS Step Functions and Lambdas**
* Join all the steps using Step Functions to execute the lambdas and invoke the batch jobs.
4. **AWS IAM, S3 and SSM Parameters**
* An S3 bucket is used to store the certificate copied from EFS.
* AWS IAM, a user is created along its access and secret keys. The credentials are used in the certbot command execution to create/renew the certificate.
* SSM Parameters, the parameters are used to store the access key and secret key from the user previously created. If these values are updated in the IAM User, the SSM parameters need to be updated too.
5. **Terraform**
* Used to deploy the pre-requisites: IAM user, S3 bucket and SSM Parameters
* Used to deploy and update the AWS Batch infrastructure
6. **Serverless Framework**
* Used to the deploy and manage the the Step Functions and Lambda functions.
## Implementation description
1. An EventBridge rule is scheduled to start the Step Function.
2. The step function process checks if the domain certificate needs to be renewed. It renews the certificate, copies it to S3, then copies it to the EC2 instance and restarts the httpd service using the SSM. Finally we get a list of the certificates.
Below the Step Function process is detailed.
1. CheckCertificate: A Lambda function is executed to check how many days are left before the certificate expires. This information is retrieved from the domain itself, meaning we're not checking the certificate stored in EFS.
2. ChoiceDaysLeft: A choice state is executed next. If the number of days is less or equal than 30 days then a renewal is executed, else only the certificate information is listed.
3. RenewCertificates: The AWS Batch Job (using Fargate) to run the renewal command is executed.
4. CopyToS3: All the files stored on EFS are copied to the S3 Bucket.
5. GetFromS3: The files inside the "live" folder are copied to the instance to the proper path.
6. The Job to run the "certbot list" command is executed.
### Setting up the Infrastructure
> NOTE: The code can be found in the GitHub [repo](https://github.com/vane2804/aws-batch-cert-renewal)
1. Follow the instructions to [install Terraform](https://developer.hashicorp.com/terraform/install)
2. Deploy the pre-requisites folder.
3. Deploy the EFS infrastructure
* Update the file prod.tfvars with the proper variables.
4. Deploy the AWS Batch infrastructure
* Update the file prod.tfvars with the proper variables.
* Update the variable "fileSystemId" in the job definition files "create_certs_job.json", "list_certs_job.json", "renew_certs_job.json"
5. Configure the IAM User and SSM Parameters
* Create the access key and secret access key for the user "certbot_batch"
* Copy the values to the SSM Parameters: /certbot_batch/access_key and /certbot_batch/secret_key.
6. Deploy the Serverless Framework infrastructure
* Follow the instructions to [install Serverless](https://www.serverless.com/framework/docs-getting-started)
7. If needed, execute the "Configurations needed only once" steps
### Configurations needed only once (the first execution)
1. The Batch Job to create a new certificate is only run once at the beginning, so certbot creates the folder infrastructure needed in EFS. The subsequent executions will be of the renewal Job.
2. The current certificate in use in the instances was copied to EFS (after the folder structure is created).
## Notes
* The approach could be modified to copy the certificate directly to the EC2 instance so the S3 bucket is not needed.
* The process could be improved by adding notifications when the process fails.
## Links Reviewed
* [Generate Let’s Encrypt Certificate with DNS Challenge and Namecheap](https://ongkhaiwei.medium.com/generate-lets-encrypt-certificate-with-dns-challenge-and-namecheap-e5999a040708)
* [Welcome to certbot-dns-route53’s documentation](https://certbot-dns-route53.readthedocs.io/en/stable/)
* [Certbot-Running with Docker](https://eff-certbot.readthedocs.io/en/stable/install.html#running-with-docker)
* [Let’s Encrypt Wildcard Certificate Configuration with AWS Route 53](https://medium.com/prog-code/lets-encrypt-wildcard-certificate-configuration-with-aws-route-53-9c15adb936a7)
| vanevargas |
1,891,886 | Bottom shape ZDZB strategy | Summary Until now, secondary market transactions have been flooded with a variety of... | 0 | 2024-06-18T03:23:58 | https://dev.to/fmzquant/bottom-shape-zdzb-strategy-1ean | startegy, cryptocurrency, fmzquant, trading | ## Summary
Until now, secondary market transactions have been flooded with a variety of trading methods. Among them, how to "entering the lowest price" and "escaping the highest price" has always been a trading method that many traders have been diligently seeking. In this article, we will using FMZ platform to achieve a bottom shape ZDZB strategy.
## Top and bottom patterns
Unlike stocks trading, futures do not fall until they are delisted from the exchange. If you pull the time period large enough, you will find that its price fluctuates up and down according to a certain cycle, even in a small cycle. So from a speculative perspective, the futures market is more pure than the stock market. With regard to the evolution of the top and bottom patterns, many and many categories have been derived.
## Double top and bottom
The double top and bottom are also called M top and W bottom, this pattern often appears in the price trend of K line. The double top is composed of two similar high points, and its shape is like the English letter M. The double bottom is composed of two similar low points, and its shape is like the English letter W.
As shown by the double bottom in the chart above, when the price continued to fall to the first low, and then rebounded to the middle relative high and low, then the price fell to the second low, these two lows are almost at the same level. Then formed a double bottom form.
## Head and shoulders
The "head and shoulders" is a typical trend reversal pattern. The top of the "head and shoulders" generally appears at the beginning of the rising market, and the bottom of the "head and shoulders" generally appears at the end of the falling market. In the figure, it is composed of "left shoulder", "top bottom", "right shoulder". As shown below:
As can be seen from the above figure, the "head and shoulders" contains three consecutive troughs, of which the middle peak is the highest position of this wave trend. The left and right sides of the middle peak are the left and right shoulders, and the left and right shoulders are relatively low. Their prices are roughly at the same level. The line segment formed by the trough connecting the left shoulder and the right shoulder is the neckline, which supports the head and shoulders.
## Triple top and bottom
The triple top and bottom is an extension of the head and shoulder top bottom, and is also a compound form of the double top and bottom. Although the probability of the triple top and bottom pattern is small, it has a higher success rate than the former two. Once the pattern is formed, it will be very large.
The above picture is a triple top and bottom. In this price trend, the three bottoms are roughly at the same price level, forming a strong support area. Unless the price has a major breakthrough, it is difficult to fall to the triple bottom. In fact, there are many forms of top-to-bottom transitions, such as: bottom triangle, convergence-diffusion triangle, diamond, flag, circular arc, etc.
## What is the bottom indicator
The bottom indicator is abbreviated as ZDZB, which is a trading method to assist buying at the rather low price. We often hear the word "breaking out buying", which is indeed a better trading method in the trend market, but this method has great limitations, especially in the shock market, it is easy to execute at the highest price, fault-tolerant cost is high. Therefore, someone thought of a method of buying at the low prices. The advantage of this method is that even if you buy it wrong, the cost of stop loss is very small. The bottom indicator gives us a direction.
## Calculate the bottom indicator
The calculation method of the bottom indicator is very simple, using the period of the past 125 days as the numerator and the period of the past 125 days as the denominator. The calculated number is then taken as the moving average of N days.
The FMZ platform MY language formula as follows:
```
COUNT(CLOSE>=REF(CLOSE,1),N1)/COUNT(CLOSE<REF(CLOSE,1),N1)
```
## Bottom indicator usage
In theory, price rise more and fall less is a long position; and fall more and rise less is a short position. If the indicator is above 1, it is a bull market , while if the indicator is below 1, it is a bear market. Through this comparison, we can use historical data as a reference to position the current market.
If the bottom indicator is used independently, the signal will be too sensitive, which will lead to frequent opening and closing. Therefore, in order to solve this problem, the bottom indicator needs to be smoothed again on average. In addition, you can use different periods to average the bottoming indicators again. Thus, two moving averages are generated, and finally the signal of opening and closing positions can be generated by crossing the two moving averages.
## Complete strategy
```
(*backtest
start: 2020-01-01 00:00:00
end: 2020-07-04 00:00:00
period: 1h
basePeriod: 1h
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES"}]
*)
//Ratio of the number of CLOSE>=REF(CLOSE,1) in N1 cycle to the number of CLOSE<REF(CLOSE,1) in N1 cycle
A:=COUNT(CLOSE>=REF(CLOSE,1),N1)/COUNT(CLOSE<REF(CLOSE,1),N1);
B:MA(A,N2);//Simple moving average of A in N2 period;
D:MA(A,N3);//Simple moving average of A in N3 period;
CROSS(B,D),BPK;//B up cross D, buy long;
CROSS(D,B),SPK;//D down cross B, sell short;
AUTOFILTER;
```
The complete strategy code has been published on the FMZ official website. Click https://www.fmz.com/strategy/217704 to copy the backtest.
## Strategy Backtest
Backtest configuration
Performance Report
Capital Curve
From: https://www.fmz.com/digest-topic/5900 | fmzquant |
1,891,873 | Como usar Tailwind CSS en una app de Django | Tailwind CSS es un framework CSS que es bastante versátil, debido a que permite que cualquier tipo de... | 0 | 2024-06-18T03:22:18 | https://dev.to/josemiguelsandoval/como-usar-tailwind-css-en-una-app-de-django-15of | tailwindcss, django | Tailwind CSS es un framework CSS que es bastante versátil, debido a que permite que cualquier tipo de diseño se pueda indicar directamente desde la clase del elemento, es por esto, que Tailwind ha ganado bastante popularidad en este último tiempo.
Para utlizar Tailwind dentro de una app de Django se puede utilizar la librería django-compressor y el gestor de paquetes npm para la instalación de tailwind. Los pasos necesarios son los siguientes:
## Paso 1: Configuración de los templates en Django
Dentro del directorio de Django, crea una nueva carpeta `templates/` y configura el archivo `settings.py` de Django de la siguiente forma para indicarle que se trabajará con esa carpeta:
```python
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [BASE_DIR / 'templates'],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
```
## Paso 2: Instalación de django-compressor
Instala django-compressor ejecutando el siguiente comando:
```bash
pip install django-compressor
```
Y agregalo a la lista de aplicaciones instaladas dentro del archivo `settings.py`:
```python
# settings.py
INSTALLED_APPS = [
...
'compressor',
...
]
```
## Paso 3: Configuración de django-compressor dentro del archivo `settings.py`
```python
COMPRESS_ENABLED = True
COMPRESS_ROOT = BASE_DIR / 'static'
STATICFILES_FINDERS = ('compressor.finders.CompressorFinder',)
```
## Paso 4: Creación de los archivos estáticos
Crea el directorio `static/src/` dentro del proyecto, y crea el archivo `input.css` dentro del directorio creado. El proyecto debiese quedar como se muestra a continuación:
```
myproject/
├── manage.py
├── templates
├── myproject
│ ├── init.py
│ ├── settings.py
│ ├── urls.py
│ ├── asgi.py
│ └── wsgi.py
└── static
└── src
└── input.css
```
## Paso 5: Creación de un archivo html base
Crea un archivo `base.html` dentro de la carpeta `templates`, y escribe lo siguiente en su interior:
```html
{% load compress %}
{% load static %}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Tailwind</title>
{% compress css %}
<link rel="stylesheet" href="{% static 'src/output.css' %}">
{% endcompress %}
</head>
<body>
{% block content %}
{% endblock content %}
</body>
</html>
```
## Paso 6: Instalación de Tailwind CSS
Para instalar Tailwind CSS utilizaremos npm:
```bash
npm install -D tailwindcss
```
Para crear el archivo de configuraciones de tailwind `tailwind.config.js`, ejecutamos el siguiente comando:
```bash
npx tailwindcss init
```
Para que tailwind reconozca que estamos utilizando los archivos html dentro de la carpeta `templates` editamos el archivo de configuraciones `tailwind.congig.js` de la siguiente forma:
```javascript
module.exports = {
content: [
'./templates/**/*.html'
],
theme: {
extend: {},
},
plugins: [],
}
```
## Paso 7: Importar las directivas de Tailwind
Se deben importar las directivas de Tailwind escribiendo lo siguiente en el archivo `input.css` que se encuentra dentro del directorio `./static/src/`:
```css
@tailwind base;
@tailwind components;
@tailwind utilities;
```
## Paso 8: Compilación del código de Tailwind
Para compilar el código de Tailwind que necesita Django para importar los estilos, se debe ejecutar el siguiente comando:
```bash
npx tailwindcss -i ./static/src/input.css -o ./static/src/output.css --minify
```
Esto creara un archivo `output.css` dentro del directorio `./static/src/`.
## Paso 9: Compilar automáticamente el código de Tailwind
A medida que se va agregando etiquetas con estilo de Tailwind CSS, se necesita volver a ejecutar el comando del paso 8 para que se reconozcan las directivas. Para automatizar esto en el modo de desarrollo, se puede ejecutar el siguiente comando:
```bash
npx tailwindcss -i ./static/src/input.css -o ./static/src/output.css --watch --minify
```
Esto creara un archivo `output.css` dentro del directorio `./static/src/`.
## Paso 10: Uso del framework
Ahora ya puedes utilizar Tailwind CSS en tu aplicación de Django:
```html
<div class="bg-black p-3 rounded-lg">
<h1 class="text-2xl text-white">Hola mundo</h1>
</div>
```
## Conclusiones
Siguiendo estos pasos, podrás utilizar Tailwind dentro de tu aplicación de Django. Cada vez que agregues nuevo código de Tailwind dentro de las etiquetas de HTML, se modificará el archivo `./static/src/output.css` si estas utilizando el comando del paso 9.
Espero que te haya sido de utilidad :) Cualquier duda, consulta o sugerencia, házmela llegar a través de los comentarios.
| josemiguelsandoval |
1,891,867 | Is the ellipsis in your Japanese font centered in the line? Here is the solution. | Hey fellow software developers, have you ever worked with Japanese fonts (or other special fonts) and... | 0 | 2024-06-18T03:17:32 | https://dev.to/doantrongnam/is-the-ellipsis-in-your-japanese-font-centered-in-the-line-here-is-the-solution-3pjl | ellipsis, css, scss, webdev | Hey fellow software developers, have you ever worked with Japanese fonts (or other special fonts) and encountered the issue where the ellipsis in line breaks is centered? For example, as shown below:
[Code](https://jsfiddle.net/doantrongnam/n170wx8L/1/)
Here are 2 solutions for you:
## 1. Cut the string and add 3 dots.
The interesting thing is that only the browser's ellipsis has this issue, while typing three dots manually doesn't cause any problems. Therefore, we can cut the string at a fixed number of characters and then add three dots. However, I don't recommend this approach. Its advantage is that it will definitely work. But the disadvantage is that the length of each character varies, so if we cut at the same number of characters, the items will have different lengths. This makes our webpage look unattractive. Moreover, if the technical requirement is to cut at a certain number of lines, it is difficult to determine the number of characters to cut to fit the number of lines. Not to mention other issues such as different devices, different screen widths, etc.
## 2. Replace the font of the ellipsis.
Here is the solution
```scss
@font-face {
// Font name, you can name it whatever you want
font-family: 'ellipsis-font';
// get the font locally, you can replace it with any font you want
src: local('Times New Roman');
// only override the ellipsis, here is the unicode for the ellipsis
unicode-range: U+2026;
}
.your-text-class {
font-family: 'ellipsis-font', ... // insert your default font-family here
}
```
Result:
[Code](https://jsfiddle.net/doantrongnam/8trbhdLp/4/)
The advantage of this method is that the length is cut very flexibly, and you can combine it with -webkit-line-clamp to customize the number of lines. The disadvantage is that if the user's local machine doesn't have the font you used, the ellipsis will still appear centered in the line. | doantrongnam |
1,891,866 | Setting Up Elasticsearch and Kibana Single-Node with Docker Compose | Introduction Setting up Elasticsearch and Kibana on a single-node cluster can be a... | 0 | 2024-06-18T03:15:08 | https://dev.to/karthiksdevopsengineer/setting-up-elasticsearch-and-kibana-single-node-with-docker-compose-74j | elasticsearch, docker, tutorial, devops | ## Introduction
Setting up Elasticsearch and Kibana on a single-node cluster can be a straightforward process with Docker Compose. In this guide, we’ll walk through the steps to get your Elasticsearch and Kibana instances up and running smoothly.
## Hardware Prerequisites
According to the Elastic Cloud Enterprise documentation, here are the hardware requirements for running Elasticsearch and Kibana
- **CPU:** A minimum of 2 CPU cores is recommended, but the actual requirement depends on your workload. More CPU cores may be required for intensive tasks or larger datasets.
- **RAM:** Elastic recommends a minimum of 8GB of RAM for Elasticsearch, but 16GB or more is recommended for production use, especially when running both Elasticsearch and Kibana on the same machine.
- **Storage:** SSD storage is recommended for better performance, especially for production use. The amount of storage required depends on your data volume and retention policies.
For more detailed hardware requirements and recommendations, refer to the [Elastic Cloud Enterprise documentation.](https://www.elastic.co/guide/en/cloud-enterprise/current/ece-hardware-prereq.html#ece-hardware-prereq)
## Software Prerequisites
Before getting started, make sure you have Docker installed on your system. You can download and install Docker from the [official website](https://docs.docker.com/engine/install/).
## Setting Up Instructions
In this guide, I will perform these operations with the following specifications.
- **OS:** Ubuntu 22.04
- **RAM:** 8GB
- **Storage:** 30GB SSD
**1. Adjust Kernel Settings**
The `vm.max_map_count` kernel setting must be set to at least `262144`. How you set `vm.max_map_count` depends on your platform. [For more information](https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html#_set_vm_max_map_count_to_at_least_262144). I’m using the Linux operating system, so I will set vm.max_map_count using as follows
Open the `/etc/sysctl.conf` file in a text editor with root privileges. You can use the following command
```
sudo nano /etc/sysctl.conf
```
Navigate to the end of the file or search for the line containing `vm.max_map_count`, If the line exists, modify it to set the desired value
```
vm.max_map_count=262144
```
If the line doesn’t exist, add it at the end of the file
```
# Set vm.max_map_count to increase memory map areas
vm.max_map_count=262144
```
Save the file and exit the text editor. Apply the changes by running the following command
```
sudo sysctl -p
```
This command reloads the sysctl settings from the configuration file. Now, the value of `vm.max_map_count` should be updated to `262144`.
**2. Prepare Environment Variables**
Create or navigate to an empty directory for the project. Inside this directory, create a `.env` file and set up the necessary environment variables.
Copy the following content and paste it into the `.env` file.
```
# Password for the 'elastic' user (at least 6 characters)
ELASTIC_PASSWORD=
# Password for the 'kibana_system' user (at least 6 characters)
KIBANA_PASSWORD=
# Version of Elastic products
STACK_VERSION={version}
# Set the cluster name
CLUSTER_NAME=docker-cluster
# Set to 'basic' or 'trial' to automatically start the 30-day trial
LICENSE=basic
# Port to expose Elasticsearch HTTP API to the host
ES_PORT=9200
# Port to expose Kibana to the host
KIBANA_PORT=5601
# Increase or decrease based on the available host memory (in bytes)
MEM_LIMIT=2147483648
```
In the `.env file`, specify a password for the `ELASTIC_PASSWORD` and `KIBANA_PASSWORD` variables.
The passwords must be alphanumeric and can’t contain special characters, such as `!` or `@`. The bash script included in the `compose.yml` file only works with alphanumeric characters. Example:
```
# Password for the 'elastic' user (at least 6 characters)
ELASTIC_PASSWORD=Secure123
# Password for the 'kibana_system' user (at least 6 characters)
KIBANA_PASSWORD=Secure123
...
```
In the `.env` file, set `STACK_VERSION` to the Elastic Stack version. Example:
```
...
# Version of Elastic products
STACK_VERSION=8.13.2
...
```
**3. Create Docker Compose Configuration**
Now, create a `compose.yml` file in the same directory and copy the following content and paste it into the `compose.yml` file.
```
version: "2.2"
services:
setup:
image: docker.elastic.co/elasticsearch/elasticsearch:${STACK_VERSION}
volumes:
- certs:/usr/share/elasticsearch/config/certs
user: "0"
command: >
bash -c '
if [ x${ELASTIC_PASSWORD} == x ]; then
echo "Set the ELASTIC_PASSWORD environment variable in the .env file";
exit 1;
elif [ x${KIBANA_PASSWORD} == x ]; then
echo "Set the KIBANA_PASSWORD environment variable in the .env file";
exit 1;
fi;
if [ ! -f config/certs/ca.zip ]; then
echo "Creating CA";
bin/elasticsearch-certutil ca --silent --pem -out config/certs/ca.zip;
unzip config/certs/ca.zip -d config/certs;
fi;
if [ ! -f config/certs/certs.zip ]; then
echo "Creating certs";
echo -ne \
"instances:\n"\
" - name: es01\n"\
" dns:\n"\
" - es01\n"\
" - localhost\n"\
" ip:\n"\
" - 127.0.0.1\n"\
> config/certs/instances.yml;
bin/elasticsearch-certutil cert --silent --pem -out config/certs/certs.zip --in config/certs/instances.yml --ca-cert config/certs/ca/ca.crt --ca-key config/certs/ca/ca.key;
unzip config/certs/certs.zip -d config/certs;
fi;
echo "Setting file permissions"
chown -R root:root config/certs;
find . -type d -exec chmod 750 \{\} \;;
find . -type f -exec chmod 640 \{\} \;;
echo "Waiting for Elasticsearch availability";
until curl -s --cacert config/certs/ca/ca.crt https://es01:9200 | grep -q "missing authentication credentials"; do sleep 30; done;
echo "Setting kibana_system password";
until curl -s -X POST --cacert config/certs/ca/ca.crt -u "elastic:${ELASTIC_PASSWORD}" -H "Content-Type: application/json" https://es01:9200/_security/user/kibana_system/_password -d "{\"password\":\"${KIBANA_PASSWORD}\"}" | grep -q "^{}"; do sleep 10; done;
echo "All done!";
'
healthcheck:
test: ["CMD-SHELL", "[ -f config/certs/es01/es01.crt ]"]
interval: 1s
timeout: 5s
retries: 120
es01:
image: docker.elastic.co/elasticsearch/elasticsearch:${STACK_VERSION}
volumes:
- certs:/usr/share/elasticsearch/config/certs
- esdata:/usr/share/elasticsearch/data
ports:
- ${ES_PORT}:9200
environment:
- node.name=es01
- cluster.name=${CLUSTER_NAME}
- discovery.type=single-node
- ELASTIC_PASSWORD=${ELASTIC_PASSWORD}
- bootstrap.memory_lock=true
- xpack.security.enabled=true
- xpack.security.http.ssl.enabled=true
- xpack.security.http.ssl.key=certs/es01/es01.key
- xpack.security.http.ssl.certificate=certs/es01/es01.crt
- xpack.security.http.ssl.certificate_authorities=certs/ca/ca.crt
- xpack.security.transport.ssl.enabled=true
- xpack.security.transport.ssl.key=certs/es01/es01.key
- xpack.security.transport.ssl.certificate=certs/es01/es01.crt
- xpack.security.transport.ssl.certificate_authorities=certs/ca/ca.crt
- xpack.security.transport.ssl.verification_mode=certificate
- xpack.license.self_generated.type=${LICENSE}
mem_limit: ${MEM_LIMIT}
ulimits:
memlock:
soft: -1
hard: -1
healthcheck:
test:
[
"CMD-SHELL",
"curl -s --cacert config/certs/ca/ca.crt https://localhost:9200 | grep -q 'missing authentication credentials'",
]
interval: 10s
timeout: 10s
retries: 120
kibana:
depends_on:
es01:
condition: service_healthy
image: docker.elastic.co/kibana/kibana:${STACK_VERSION}
volumes:
- certs:/usr/share/kibana/config/certs
- kibanadata:/usr/share/kibana/data
ports:
- ${KIBANA_PORT}:5601
environment:
- SERVERNAME=kibana
- ELASTICSEARCH_HOSTS=https://es01:9200
- ELASTICSEARCH_USERNAME=kibana_system
- ELASTICSEARCH_PASSWORD=${KIBANA_PASSWORD}
- ELASTICSEARCH_SSL_CERTIFICATEAUTHORITIES=config/certs/ca/ca.crt
- SERVER_PUBLICBASEURL=http://localhost:5601
mem_limit: ${MEM_LIMIT}
healthcheck:
test:
[
"CMD-SHELL",
"curl -s -I http://localhost:5601 | grep -q 'HTTP/1.1 302 Found'",
]
interval: 10s
timeout: 10s
retries: 120
volumes:
certs:
driver: local
esdata:
driver: local
kibanadata:
driver: local
```
**4. Start Docker Compose**
Now you can start Elasticsearch and Kibana using Docker Compose. Run the following command from your project directory
```
docker compose up -d
```
**5. Access Elasticsearch and Kibana**
Once Docker Compose has started the services, you can access Elasticsearch at `https://<localhost or serverip>:9200` and Kibana at `http://<localhost or serverip>:5601` in your web browser.
Log in to Elasticsearch or Kibana as the elastic user and the password is the one you set earlier in the `.env` file.
## Conclusion
You’ve successfully set up Elasticsearch and Kibana on a single-node using Docker Compose.
**Reference** https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html
| karthiksdevopsengineer |
1,891,865 | 🚀 Elevate your CI/CD pipeline with Razorops! 🚀 | Looking for a robust and scalable solution for your CI/CD needs? Razorops offers a cloud-based... | 0 | 2024-06-18T03:08:43 | https://dev.to/varshini_18/elevate-your-cicd-pipeline-with-razorops-3fkb |
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#CICD #DevOps #ContinuousIntegration #ContinuousDelivery #Razorops #DevTools | varshini_18 | |
1,817,134 | Building a Scalable Authentication System with JWT in a MERN Stack Application | Introduction: Authentication is a fundamental aspect of web development, ensuring that users can... | 0 | 2024-06-18T03:07:09 | https://dev.to/abhilaksharora/building-a-scalable-authentication-system-with-jwt-in-a-mern-stack-application-4180 | **Introduction:**
Authentication is a fundamental aspect of web development, ensuring that users can securely access protected resources. JSON Web Tokens (JWT) have become a popular choice for implementing authentication in modern web applications due to their simplicity and scalability. In this tutorial, we'll explore how to implement a scalable authentication system using JWT in a MERN (MongoDB, Express.js, React, Node.js) stack application. We'll cover user registration, login, token generation, and secure authorization.
**Prerequisites:**
Before we begin, make sure you have the following prerequisites installed:
- Node.js and npm (Node Package Manager)
- MongoDB (you can use a local or remote instance)
- React.js (if you're building a frontend)
**Setting Up the Backend:**
1. **Initialize a New Node.js Project:**
Create a new directory for your project and initialize a new Node.js project by running the following commands:
```
mkdir mern-authentication
cd mern-authentication
npm init -y
```
2. **Install Required Packages:**
Install the necessary packages for our backend using the following command:
```
npm install express mongoose jsonwebtoken bcryptjs body-parser cors
```
- `express`: Web framework for Node.js.
- `mongoose`: MongoDB object modeling tool.
- `jsonwebtoken`: Library for generating JWT tokens.
- `bcryptjs`: Library for hashing passwords securely.
- `body-parser`: Middleware for parsing request bodies.
- `cors`: Middleware for enabling Cross-Origin Resource Sharing.
3. **Create a MongoDB Database:**
Set up a MongoDB database either locally or using a cloud service like MongoDB Atlas. Note down the connection URI.
4. **Create the Backend Server:**
Create a file named `server.js` and set up a basic Express server with MongoDB connection:
```javascript
// server.js
const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const cors = require('cors');
const app = express();
const PORT = process.env.PORT || 5000;
// Middleware
app.use(bodyParser.json());
app.use(cors());
// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/mern_auth', {
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
})
.then(() => console.log('MongoDB connected'))
.catch(err => console.log(err));
// Routes
app.use('/api/auth', require('./routes/auth'));
// Start the server
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});
```
5. **Create Routes for Authentication:**
Create a folder named `routes` and add a file named `auth.js` inside it. This file will contain routes for user registration, login, and token verification.
```javascript
// routes/auth.js
const express = require('express');
const router = express.Router();
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
const User = require('../models/User');
const { check, validationResult } = require('express-validator');
// Register a new user
router.post('/register', [
check('name', 'Please enter a name').not().isEmpty(),
check('email', 'Please include a valid email').isEmail(),
check('password', 'Please enter a password with 6 or more characters').isLength({ min: 6 })
], async (req, res) => {
// Validation errors
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const { name, email, password } = req.body;
try {
// Check if user already exists
let user = await User.findOne({ email });
if (user) {
return res.status(400).json({ msg: 'User already exists' });
}
// Create new user
user = new User({ name, email, password });
// Hash password
const salt = await bcrypt.genSalt(10);
user.password = await bcrypt.hash(password, salt);
// Save user to database
await user.save();
// Generate JWT token
const payload = {
user: { id: user.id }
};
jwt.sign(payload, 'jwtSecret', { expiresIn: 3600 }, (err, token) => {
if (err) throw err;
res.json({ token });
});
} catch (err) {
console.error(err.message);
res.status(500).send('Server Error');
}
});
// Login route
router.post('/login', [
check('email', 'Please include a valid email').isEmail(),
check('password', 'Password is required').exists()
], async (req, res) => {
// Validation errors
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const { email, password } = req.body;
try {
// Check if user exists
let user = await User.findOne({ email });
if (!user) {
return res.status(400).json({ msg: 'Invalid credentials' });
}
// Compare passwords
const isMatch = await bcrypt.compare(password, user.password);
if (!isMatch) {
return res.status(400).json({ msg: 'Invalid credentials' });
}
// Generate JWT token
const payload = {
user: { id: user.id }
};
jwt.sign(payload, 'jwtSecret', { expiresIn: 3600 }, (err, token) => {
if (err) throw err;
res.json({ token });
});
} catch (err) {
console.error(err.message);
res.status(500).send('Server Error');
}
});
module.exports = router;
```
6. **Create a User Model:**
Create a folder named `models` and add a file named `User.js` inside it. This file will define the user schema and model.
```javascript
// models/User.js
const mongoose = require('mongoose');
const UserSchema = new mongoose.Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true,
unique: true
},
password: {
type: String,
required: true
},
date: {
type: Date,
default: Date.now
}
});
module.exports = User = mongoose.model('user', UserSchema);
```
**Conclusion:**
In this tutorial, we've implemented a scalable authentication system using JSON Web Tokens (JWT) in a MERN stack application. We've covered user registration, login, token generation, and secure authorization. This authentication system provides a solid foundation for building secure and scalable web applications. Feel free to extend this implementation by adding features like password reset, email verification, and role-based access control. | abhilaksharora | |
1,891,864 | AWS SNS: Your Go-To Solution for Building Decoupled and Scalable Applications | AWS SNS: Your Go-To Solution for Building Decoupled and Scalable Applications In today's... | 0 | 2024-06-18T03:02:40 | https://dev.to/virajlakshitha/aws-sns-your-go-to-solution-for-building-decoupled-and-scalable-applications-15p | 
# AWS SNS: Your Go-To Solution for Building Decoupled and Scalable Applications
In today's fast-paced digital landscape, building applications that are both highly scalable and loosely coupled is paramount. Enter AWS Simple Notification Service (SNS), a powerful messaging service that provides a robust platform for application-to-application (A2A) and application-to-person (A2P) communication.
### What is AWS SNS?
At its core, AWS SNS is a pub/sub (publish/subscribe) messaging service. This means it facilitates communication where senders (publishers) don't need to know the specific recipients (subscribers) of their messages. Instead, publishers categorize messages into logical groups called "topics," and subscribers express interest in one or more topics.
Here's a breakdown of the core components:
* **Topics:** These act as message categories. Publishers send messages to a specific topic.
* **Publishers:** Any component that sends messages to an SNS topic. Examples include AWS services like S3, EC2, or custom applications.
* **Subscribers:** Components that receive messages published to the topics they've subscribed to. Subscribers can be other AWS services (like SQS queues, Lambda functions, or email addresses), HTTP endpoints, or mobile devices.
### Key Benefits of Using SNS:
* **Decoupling:** SNS decouples components of your architecture, enhancing fault tolerance. If a subscriber is down, messages are persisted by SNS, and delivery is retried.
* **Scalability:** Designed to handle massive volumes of messages, SNS allows you to scale your applications effortlessly.
* **Flexibility:** With a variety of supported messaging protocols (HTTP, HTTPS, Email, SMS, SQS, Lambda), SNS provides immense flexibility for your messaging needs.
* **Cost-effectiveness:** You pay only for what you use. There are no minimum fees, making it ideal for applications with sporadic messaging patterns.
## Five Compelling Use Cases for AWS SNS
### 1. Building Real-Time Notification Systems:
Imagine you're running an e-commerce platform, and you want to notify your customers about order updates, shipment confirmations, or special offers. SNS makes this seamless:
1. **Create an SNS topic**: Designate it for order notifications.
2. **Set up subscriptions**: Customers who opt in for SMS notifications have their phone numbers subscribed to the topic. For email notifications, subscribe their email addresses.
3. **Publish messages:** When an order status changes, your application publishes a message to the order notifications topic.
4. **SNS handles delivery:** SNS takes care of routing the message to the correct subscribers based on their preferred delivery method (SMS, email).
### 2. Fan-Out Processing for Parallel Workloads:
SNS is highly effective for triggering multiple parallel processes from a single event. Let's say you're building an image processing pipeline:
1. **Image Upload Event:** A user uploads an image to your S3 bucket, triggering an S3 event notification.
2. **SNS Fan-out:** This event notification publishes a message to an SNS topic.
3. **Parallel Processing:** You might have subscribers to this topic, such as:
* A Lambda function to generate a thumbnail of the image.
* Another Lambda function to analyze the image content for tagging purposes.
* An EC2 instance running a machine learning model for more complex image recognition.
4. **Efficient Workflows:** SNS enables you to parallelize these tasks, significantly reducing overall processing time.
### 3. Implementing Serverless Workflows with AWS Lambda:
SNS integrates tightly with AWS Lambda, allowing you to build efficient, event-driven architectures. Consider a scenario where you need to process data in real time as it arrives:
1. **Data Ingestion:** Data from various sources (IoT devices, applications) is sent to an SNS topic.
2. **Lambda Trigger:** Your pre-written Lambda functions are subscribed to this SNS topic.
3. **Event-Driven Processing:** Each time new data arrives on the topic, SNS invokes the subscribed Lambda functions concurrently.
4. **Scalability and Cost Efficiency:** This architecture scales automatically with your data volume, and you pay only for the compute time Lambda functions consume.
### 4. Cross-Account Communication:
SNS simplifies secure communication between different AWS accounts. Imagine you have separate AWS accounts for development, testing, and production:
1. **Centralized Topic:** Create an SNS topic in a shared, central account.
2. **Cross-Account Subscriptions:** Grant permissions for resources in other accounts (e.g., SQS queues, Lambda functions) to subscribe to the central topic.
3. **Secure Messaging:** Your applications can now publish messages to this central topic, and SNS ensures secure delivery to the subscribers in different accounts.
### 5. Mobile Push Notifications:
Delivering push notifications to mobile devices is simplified with SNS. Here's how it works:
1. **Device Token Registration:** Your mobile app registers device tokens with SNS.
2. **Topic Subscription:** These device tokens are subscribed to relevant SNS topics (e.g., news updates, promotional offers).
3. **Targeted Messaging:** You can send targeted push notifications based on user preferences or actions by publishing messages to specific topics.
4. **Platform Agnostic:** SNS supports both Android and iOS devices.
## Alternative Solutions and Comparison
While AWS SNS shines in various use cases, it's essential to be aware of alternative messaging services:
* **Google Cloud Pub/Sub:** Similar to SNS, offering scalable messaging but with a more complex pricing model.
* **Azure Service Bus:** Offers advanced features like message sessions and dead-letter queues, potentially suitable for more complex messaging scenarios.
* **RabbitMQ (self-hosted):** Provides robust messaging but requires infrastructure management.
## Conclusion
AWS SNS is a powerful service that empowers you to build highly scalable, decoupled, and event-driven applications. Its flexibility, cost-effectiveness, and seamless integration with other AWS services make it a compelling choice for a wide range of messaging use cases.
---
## Advanced Use Case: Architecting a Real-time Threat Detection System
Now, let's delve into a more advanced scenario, combining multiple AWS services to illustrate the true power of SNS.
**Scenario:** You're tasked with building a real-time threat detection system for a large organization. The system needs to process security logs from various sources, analyze them for potential threats, and trigger automated responses if anomalies are detected.
**Architecture:**
1. **Log Aggregation (AWS Kinesis):** Security logs from diverse sources (firewalls, intrusion detection systems, cloud trails) are continuously streamed into AWS Kinesis Data Streams.
2. **Real-Time Processing (AWS Kinesis Data Firehose):** Kinesis Firehose consumes logs from the data stream. It performs data transformation (e.g., parsing, enriching logs) and filters out non-critical events.
3. **Threat Analysis (AWS Lambda):** Filtered log data is sent to an SNS topic. A Lambda function subscribed to this topic performs real-time threat analysis. This might involve pattern matching, anomaly detection algorithms, or integration with threat intelligence feeds.
4. **Alerting and Response:**
* **High-Severity Threats:** If a critical threat is detected, the Lambda function publishes a message to a "high-priority alerts" SNS topic.
* **Automated Actions:** This topic could trigger:
* An AWS Lambda function to automatically block malicious IP addresses at the firewall level.
* An SNS subscription sending SMS alerts to security engineers for immediate action.
* **Low-Severity Threats:** Less critical threats could trigger messages to a different SNS topic, perhaps for further investigation or logging.
**Benefits:**
* **Real-Time Detection and Response:** Kinesis and SNS enable real-time log processing, analysis, and immediate automated response.
* **Scalability:** The system can scale horizontally to handle massive log volumes as your organization grows.
* **Flexibility:** You can easily integrate additional threat intelligence feeds or modify the analysis logic in Lambda functions without disrupting the entire pipeline.
* **Centralized Alerting:** SNS provides a centralized mechanism for managing alerts and notifications based on threat severity.
This example demonstrates how SNS, in conjunction with other AWS services, can be leveraged to build sophisticated, real-world solutions that meet the demands of complex enterprise environments.
| virajlakshitha | |
1,890,837 | Constants, Object.freeze, Object.seal and Immutable in JavaScript | Introduction In this article, we're diving into Immutable and Mutable in JavaScript, while... | 27,954 | 2024-06-18T03:00:00 | https://howtodevez.blogspot.com/2024/03/constants-objectfreeze-objectseal-and-immutable.html | typescript, javascript, webdev, newbie | ## Introduction
In this article, we're diving into **Immutable** and **Mutable** in JavaScript, while also exploring how functions like **_Object.freeze()_** and **_Object.seal()_** relate to **Immutable**. This is a pretty important topic that can be super helpful in projects with complex codebase.
## So, what's Immutable?
Immutable is like a property of data in JavaScript. It means once the data is created, it can't be changed. This allows for better memory management and catching changes promptly. This is a big deal and totally contrasts with Mutable, which is the default nature when you initialize data in JavaScript.
Implementing Immutable in a project makes development much smoother, reduces issues that crop up, and saves a ton of effort and time for maintenance down the road.
## But what happens if you don't use Immutable?
Let me give you an example of how changing data during development can lead to some serious issues.
```ts
let info = {
name: "name",
address: "address"
};
function doSomeThing() {
if (info.name = "Name to compare") { // change value
// handle something
}
info = { name: "Another name" }; // change value
// do something else
}
doSomeThing(info);
console.log(info);
```
Here's a simple example to show how data can easily be changed. You might not see a big problem here, but imagine in a large project with lots of complex functions. Changing data like this can hide many risks, leading to unnecessary issues and significantly increasing the time spent tracking issues and maintaining the code.
## Using constants (const)
When a variable is defined as a constant, it means you can't assign a different value to that variable. However, it's important to note that in JavaScript, there are reference types, and even a constant variable's reference value can still be changed.
**For example:**
```ts
const v1 = {a: 1, b: '2', c: [1, 2, 3]}
// v1 = 2 // TypeError: Assignment to constant variable
v1.a = 3 // work
v1.c.push(4) // work
v1['d'] = true // work
delete v1.b // work
console.log(v1)
const v2 = [1, 2, 3]
v2.push(4) // work
console.log(v2)
```
As you can see, even when using constants, the fields within an object can still have their values changed, and new fields can be added or existing ones removed. Generally, data types like **object** (including **array**) remain mutable.
## Using Object.freeze()
This is a built-in function provided by JavaScript to prevent modifications, additions, or deletions of existing fields within an object.
**Let's take a look at an example:**
```ts
const v3 = {a: 1, b: '2', c: [1, 2, 3]}
Object.freeze(v3)
const v3 = Object.freeze({a: 1, b: '2', c: [1, 2, 3]}) // the same with above
// v3 = 2 // TypeError: Assignment to constant variable
// v3.a = 4 // Cannot assign to read only property 'a' of object
v3.c.push(4) // work
// v3['d'] = true // Cannot add property d, object is not extensible
// delete v3.b // Cannot delete property 'b' of #<Object>
console.log(v3)
```
You can see there's a significant improvement in immutability when using **_Object.freeze()_** compared to just using constants. However, for reference types, they can still be altered.
In JavaScript, there's also the **_Object.isFrozen_** function provided to check if a variable is a frozen object.
## Using Object.seal()
With the built-in function Object.seal, it only prevents adding new properties or deleting existing ones, but it still allows changing the value of properties.
```ts
const v5 = {a: 1, b: '2', c: [1, 2, 3]}
Object.seal(v5)
// v4 = 2 // TypeError: Assignment to constant variable
v5.a = 4 // work
v5.c.push(4) // work
// v4['d'] = true // Cannot add property d, object is not extensible
// delete v4.b // Cannot delete property 'b' of #<Object>
console.log(v5)
```
Similarly to **_Object.freeze_**, **_Object.seal_** has the **_Object.isSealed_** function to check if an object is sealed.
## Using the immer library
Let me introduce you to the immer library, which provides comprehensive immutable capabilities, suitable for both Front-end and Back-end development. It's a fantastic library, straightforward to use, and highly recommended by many developers.
Installation: **_npm i immer_**
After that, you can use this library very simply following the instructions below:
```ts
import {Immer, produce} from 'immer'
const immer = new Immer() // default {autoFreeze: true})
const v1 = {a: 1, b: '2', c: [1, 2, 3]}
const v2 = immer.produce(v1, draft => {
draft.c.push(3, 4) // could do anything with draft value
return draft
})
// v2.b = '3' // freeze object, Cannot assign to read only property 'b' of object '#<Object>'
const v3 = produce(v2, draft => {
draft.a = 2
return draft
})
const immer2 = new Immer({autoFreeze: false})
const v4 = immer2.produce(v1, draft => {
draft.c.push(3, 4)
return draft
})
v4.b = '3' // normal object, could be re-assign
console.log('v1', v1)
console.log('v2', v2)
console.log('v3', v3)
console.log('v4', v4)
```
## Conclusion
In this article, I introduced the concept and provided you with examples related to using **_const_**, **_Object.freeze_**, and **_Object.seal_** to support you in implementing immutability in **JavaScript**.
You can combine constants with **_Object.freeze_** or **_Object.seal_** to create immutable objects, as these are features readily supported by **JavaScript**.
However, if you want absolute immutability, then you should use the **immer** library.
**_Happy coding!_**
**_If you found this content helpful, please visit [the original article on my blog](https://howtodevez.blogspot.com/2024/03/constants-objectfreeze-objectseal-and-immutable.html) to support the author and explore more interesting content._**🙏
<a href="https://howtodevez.blogspot.com/2024/03/sitemap.html" target="_blank" rel="noreferrer"><img src="https://img.shields.io/badge/Blogger-FF5722?style=for-the-badge&logo=blogger&logoColor=white" width="36" height="36" alt="Blogspot" /></a><a href="https://dev.to/chauhoangminhnguyen" target="_blank" rel="noreferrer"><img src="https://img.shields.io/badge/dev.to-0A0A0A?style=for-the-badge&logo=dev.to&logoColor=white" width="36" height="36" alt="Dev.to" /></a><a href="https://www.facebook.com/profile.php?id=61557154776384" target="_blank" rel="noreferrer"><img src="https://img.shields.io/badge/Facebook-1877F2?style=for-the-badge&logo=facebook&logoColor=white" width="36" height="36" alt="Facebook" /></a><a href="https://x.com/DavidNguyenSE" target="_blank" rel="noreferrer"><img src="https://img.shields.io/badge/X-000000?style=for-the-badge&logo=x&logoColor=white" width="36" height="36" alt="X" /></a> | chauhoangminhnguyen |
1,891,862 | The Ultimate Guide to Prisma ORM: Transforming Database Management for Developers | In the realm of software development, managing databases efficiently and effectively is crucial. This... | 0 | 2024-06-18T02:49:30 | https://dev.to/abhilaksharora/the-ultimate-guide-to-prisma-orm-transforming-database-management-for-developers-470n | webdev, prisma, programming, database | In the realm of software development, managing databases efficiently and effectively is crucial. This is where Object-Relational Mappers (ORMs) come into play. In this blog, we will explore the need for ORMs, review some of the most common ORMs, and discuss why Prisma ORM stands out. We will also provide a step-by-step guide to get started with Prisma in a TypeScript project, including how to set up a user database and integrate it with the frontend.
## The Need for ORMs
ORMs are essential tools for developers as they bridge the gap between the object-oriented world of programming languages and the relational world of databases. They provide the following benefits:
- **Abstraction**: Simplifies complex SQL queries and database interactions.
- **Productivity**: Speeds up development by automating repetitive tasks.
- **Maintainability**: Improves code readability and maintainability.
- **Database Portability**: Allows switching between different database systems with minimal code changes.
## Common ORMs
Several ORMs are popular among developers, each with its unique features and capabilities:
- **ActiveRecord (Ruby on Rails)**: Known for its simplicity and convention over configuration approach.
- **Hibernate (Java)**: A powerful and flexible ORM widely used in Java applications.
- **Entity Framework (C#)**: Integrated with .NET, offering rich functionality and ease of use.
- **Sequelize (Node.js)**: A promise-based ORM for Node.js, providing support for multiple SQL dialects.
- **Prisma (Node.js, TypeScript)**: A modern ORM that is becoming increasingly popular due to its type safety and ease of use.
## Why Prisma is Better
Prisma ORM stands out for several reasons:
- **Type Safety**: Prisma generates TypeScript types from your database schema, ensuring type safety across your application.
- **Intuitive Data Modeling**: Prisma uses a declarative schema definition, making it easy to define and understand your data model.
- **Flexible**: Supports multiple databases like MySQL, PostgreSQL, and MongoDB.
- **Powerful Tools**: Prisma includes features like Prisma Studio (a GUI for database management), migrations, and a powerful query engine.
- **Middleware**: Prisma allows you to add custom logic to your database queries through middleware.
- **Prisma Accelerate**: Optimizes query performance, especially in serverless environments.
## Getting Started with Prisma in a TypeScript Project
Here's a step-by-step guide to set up Prisma in a new TypeScript project.
### 1. Initialize an Empty Node.js Project
```sh
npm init -y
```
### 2. Add Dependencies
```sh
npm install prisma typescript ts-node @types/node --save-dev
```
### 3. Initialize TypeScript
```sh
npx tsc --init
```
Update the `tsconfig.json` file:
- Change `rootDir` to `src`
- Change `outDir` to `dist`
### 4. Initialize a Fresh Prisma Project
```sh
npx prisma init
```
This command sets up the Prisma directory structure and creates a `schema.prisma` file.
### 5. Selecting Your Database
Prisma supports multiple databases. You can update `prisma/schema.prisma` to set up your desired database. For example, to use PostgreSQL, modify the `datasource` block:
```prisma
datasource db {
provider = "postgresql"
url = env("DATABASE_URL")
}
```
### 6. Defining Your Data Model
In the `schema.prisma` file, define the shape of your data. For example, a simple User model:
```prisma
model User {
id Int @id @default(autoincrement())
name String
email String @unique
}
```
### 7. Applying Migrations
To apply the migrations and create the database schema:
```sh
npx prisma migrate dev --name init
```
### 8. Generating the Prisma Client
After defining your data model, generate the Prisma client:
```sh
npx prisma generate
```
### 9. Create the Backend Server
In the `src` directory, create an `index.ts` file and set up an Express server:
```ts
import express from 'express';
import bodyParser from 'body-parser';
import { PrismaClient } from '@prisma/client';
const app = express();
const prisma = new PrismaClient();
app.use(bodyParser.json());
app.post('/api/users', async (req, res) => {
const { name, email } = req.body;
try {
const user = await prisma.user.create({
data: {
name,
email,
},
});
res.status(201).json(user);
} catch (error) {
res.status(400).json({ error: error.message });
}
});
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
console.log(`Server is running on http://localhost:${PORT}`);
});
```
### 10. Run the Backend Server
Add a script to your `package.json` to run the server:
```json
"scripts": {
"dev": "ts-node src/index.ts"
}
```
Start the server:
```sh
npm run dev
```
## Integrating Prisma with the Frontend
To integrate Prisma with the frontend, we'll set up two separate directories: `backend` for the server-side code and `frontend` for the client-side code. This separation ensures a clear structure and modularity in your project.
### 1. Setting Up the Backend
Follow the steps above to set up the backend server using Express and Prisma.
### 2. Setting Up the Frontend
1. **Initialize the Frontend Project**
Create a new directory for your frontend:
```sh
mkdir ../frontend
cd ../frontend
npm init -y
```
2. **Install Dependencies**
Install the necessary dependencies:
```sh
npm install react react-dom axios
npm install --save-dev typescript @types/react @types/react-dom
```
3. **Initialize TypeScript**
Initialize TypeScript in your frontend directory:
```sh
npx tsc --init
```
4. **Set Up a Basic React App**
Create a `src` directory and add a `index.tsx` file:
```tsx
import React, { useState } from 'react';
import ReactDOM from 'react-dom';
import axios from 'axios';
const CreateUser: React.FC = () => {
const [name, setName] = useState('');
const [email, setEmail] = useState('');
const handleSubmit = async (e: React.FormEvent) => {
e.preventDefault();
try {
const response = await axios.post('http://localhost:3000/api/users', { name, email });
console.log('User created:', response.data);
} catch (error) {
console.error('Error creating user:', error);
}
};
return (
<form onSubmit={handleSubmit}>
<input
type="text"
value={name}
onChange={(e) => setName(e.target.value)}
placeholder="Name"
required
/>
<input
type="email"
value={email}
onChange={(e) => setEmail(e.target.value)}
placeholder="Email"
required
/>
<button type="submit">Create User</button>
</form>
);
};
const App: React.FC = () => (
<div>
<h1>Create User</h1>
<CreateUser />
</div>
);
ReactDOM.render(<App />, document.getElementById('root'));
```
5. **Run the Frontend App**
Add a script to your `package.json` to start the frontend app:
```json
"scripts": {
"start": "ts-node src/index.tsx"
}
```
Start the frontend app:
```sh
npm start
```
### 3. Connecting the Frontend to the Backend
Ensure that the backend server is running on `http://localhost:3000` and the frontend makes API requests to this address using Axios. The React component `CreateUser` handles form submissions and communicates with the backend API to create a new user.
Now you have a working setup where your Prisma-powered backend manages the database, and your React frontend interacts with it seamlessly.
## Applications of Prisma ORM
Prisma ORM can be applied in various scenarios:
- **Web Applications**: Simplifies data management for web apps built with frameworks like Next.js, Express, or NestJS.
- **APIs**: Enhances productivity in building REST or GraphQL APIs.
- **Serverless Functions**: Optimized for serverless environments, making it ideal for AWS Lambda, Vercel, or Netlify functions.
In conclusion, Prisma ORM is a modern, powerful tool that offers type safety, intuitive data modeling, and a suite of powerful features to enhance productivity and maintainability in your TypeScript projects. By following the steps outlined above, you can get started with Prisma and take advantage of its capabilities to build robust, scalable applications. | abhilaksharora |
1,891,861 | Error handling by aryan🤣 | ❤ Error Handling Error handling is the technique to handle different kinds of error in... | 0 | 2024-06-18T02:49:17 | https://dev.to/aryan015/error-handling-by-aryan-h4h | javascript, react, vue | ❤
## Error Handling
Error handling is the technique to handle different kinds of error in application. It usually consists of `try`, `catch` and `finally` keyword.
```js
try{
let a= 1;
let b = 0;
let c = a/b; // cannot divide by 0
}
catch(err){
console.log(err.message)
}
finally{
// it will run irrespective of try and catch
console.log('done')
}
```
`output`
```sh
//error message
done
```
### Throw custom error
You can throw custom error by `throw` keyword.
```js
try{
let num = 1;
let den = 0;
if(den==0){
throw 'denominator cannot be zero';
}
}
catch(err){
console.log(err.message) //denominator cannot be zero
}
finally{
console.log('please retry')
}
```
`output`
```sh
denomiator cannot be zero
please retry
```
## beeter way [throwing error]
using error constructor
```js
throw new Error(message,options)
```
```js
throw new Error('denominator cannot be zero ${name}')
```
[🔗linkedin](https://www.linkedin.com/in/aryan-khandelwal-779b5723a/)
## learning resources
[🧡Scaler - India's Leading software E-learning](www.scaler.com)
[🧡w3schools - for web developers](www.w3school.com) | aryan015 |
1,891,858 | A Dropbox nightmare: Paying for storage I can't use | In May 2022, I moved my 60TB of important data to Dropbox, believing their promise of unlimited... | 0 | 2024-06-18T02:46:22 | https://dev.to/lunks/a-dropbox-nightmare-b8a | ---
title: A Dropbox nightmare: Paying for storage I can't use
published: true
description:
tags:
# published_at: 2024-06-18 02:28 +0000
---
In May 2022, I moved my 60TB of important data to Dropbox, believing their promise of unlimited storage. This decision came after rumors that Google might end their unlimited storage option. Transitioning to Dropbox wasn't easy; I even had to change how files were named because of Dropbox's limitations. After some effort, I finally got all my data uploaded.
However, my relief was short-lived. By November 2023, Dropbox announced the end of their unlimited storage plans. Despite this change, I decided to stay because the service still seemed valuable. But soon, I faced a serious issue. My account showed conflicting information: one part said I was using 93TB of my 109TB limit, which was fine, but another part claimed I was using 130TB, which made no sense and blocked me from uploading more files.
_E-mail asking for help_
This discrepancy seemed to stem from an old upload that I had canceled and deleted. When I contacted Dropbox support for help, they were initially responsive. They discovered the cause of the error but then became less helpful. Despite my repeated attempts to resolve the problem, all I received were automated responses and one particularly confusing email that claimed the issue was resolved when it clearly wasn't.
It's been two months since I first reached out for help, and I'm still stuck. I'm paying for a service I can't fully use because of a mistake on their end that they haven't fixed. My experience has shown me that Dropbox might not be a reliable place to store my data anymore. They seem unable to manage serious issues effectively.
_E-mail received from Dropbox support_
This story is a warning to others who rely on cloud storage: the service is only as good as the support behind it. We need to be able to trust these services not just to store our data, but also to help us when things go wrong.
Dropbox haven't fixed the issue yet. I hope this story pushes them into fixing the issue and take better care of their customers. | lunks | |
1,891,859 | java prep - part 3 | can we disable the default behaviour of spring explain with example Yes, in Spring... | 27,757 | 2024-06-18T02:42:49 | https://dev.to/mallikarjunht/java-prep-part-3-5c7e | ### can we disable the default behaviour of spring explain with example
Yes, in Spring Framework, you can disable or customize default behaviors by overriding configurations or using specific annotations to alter how Spring manages components and processes requests. Let's explore a couple of examples where you might want to disable default behaviors in Spring:
### Example 1: Disabling Default Spring Security Configuration
By default, Spring Security applies a set of security configurations to your application, including basic authentication and authorization rules. You might want to disable these default behaviors if you have custom security requirements.
**Step-by-step Example:**
1. **Disable Security Auto-Configuration**:
To disable Spring Security's default configuration, you can exclude the `SecurityAutoConfiguration` class from auto-configuration in your main application class or configuration class.
```java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
@SpringBootApplication(exclude = {SecurityAutoConfiguration.class})
public class MyApplication {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
```
In this example:
- `@SpringBootApplication` is annotated with `exclude = {SecurityAutoConfiguration.class}`, which disables Spring Security's auto-configuration.
2. **Customize Security Configuration**:
After disabling default configuration, you can then customize security settings by creating your own `SecurityConfig` class and configuring it based on your specific requirements using `@EnableWebSecurity` and extending `WebSecurityConfigurerAdapter`.
```java
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
// Customize your security configuration here
http
.authorizeRequests()
.antMatchers("/public/**").permitAll()
.anyRequest().authenticated()
.and()
.formLogin()
.loginPage("/login")
.permitAll()
.and()
.logout()
.permitAll();
}
}
```
This `SecurityConfig` class provides customized security configurations, overriding the default behavior that was disabled.
### Example 2: Disabling Spring Boot Banner
Spring Boot displays a banner by default during application startup. You may want to disable this banner for specific reasons, such as cleaner log output.
**Step-by-step Example:**
1. **Disable Banner Programmatically**:
You can disable the banner programmatically by setting `spring.main.banner-mode` property to `OFF` in your `application.properties` or `application.yml`.
```properties
spring.main.banner-mode=OFF
```
This configuration instructs Spring Boot not to display the banner during application startup.
2. **Disable Banner via Configuration Class**:
Alternatively, you can disable the banner by creating a configuration class and using `SpringApplication.setBannerMode(Banner.Mode.OFF)` in your main application class.
```java
import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyApplication {
public static void main(String[] args) {
SpringApplication app = new SpringApplication(MyApplication.class);
app.setBannerMode(Banner.Mode.OFF);
app.run(args);
}
}
```
Here, `SpringApplication.setBannerMode(Banner.Mode.OFF)` disables the banner explicitly for the `MyApplication`.
### Conclusion:
Spring Framework provides flexibility to disable default behaviors by excluding auto-configurations, overriding configuration classes, or configuring properties. This approach allows developers to customize Spring applications according to specific requirements, ensuring that the framework's default behaviors align with application needs.
### How caching works with example/ archtecture diagram as code
Caching in software systems, including those built with Spring Boot, involves storing frequently accessed data in a faster access storage to improve performance and reduce load on backend systems.
```java
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Cacheable(value = "usersCache", key = "#userId")
public User getUserDetails(Long userId) {
// Simulate fetching user details from a database
User user = userRepository.findById(userId);
return user;
}
}
```
```
# Enable caching
spring.cache.type=ehcache
```
#### with Redis example
```java
import java.io.Serializable;
public class Book implements Serializable {
private String isbn;
private String title;
private String author;
// Getters and setters (omitted for brevity)
@Override
public String toString() {
return "Book{" +
"isbn='" + isbn + '\'' +
", title='" + title + '\'' +
", author='" + author + '\'' +
'}';
}
}
```
```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
@Service
public class BookService {
private static final String REDIS_KEY = "books";
@Autowired
private RedisTemplate<String, Book> redisTemplate;
public void saveBook(Book book) {
redisTemplate.opsForHash().put(REDIS_KEY, book.getIsbn(), book);
}
public Book getBook(String isbn) {
return (Book) redisTemplate.opsForHash().get(REDIS_KEY, isbn);
}
public void deleteBook(String isbn) {
redisTemplate.opsForHash().delete(REDIS_KEY, isbn);
}
}
```
| mallikarjunht | |
1,891,857 | Big O Notation | Big O Notation measures algorithm efficiency by describing time complexity in worst-case scenarios,... | 0 | 2024-06-18T02:39:38 | https://dev.to/userleo/big-o-notation-43pd | devchallenge, ai, twilio | Big O Notation measures algorithm efficiency by describing time complexity in worst-case scenarios, crucial for optimizing performance. | userleo |
1,891,856 | ASCII (248 chars) | 7-bit character encoding scheme (128 symbols) that translates letters, numbers, and basic symbols... | 0 | 2024-06-18T02:38:17 | https://dev.to/userleo/ascii-248-chars-a52 | devchallenge, cschallenge, computerscience, beginners | 7-bit character encoding scheme (128 symbols) that translates letters, numbers, and basic symbols into binary for computers to understand. Foundation for text storage and communication. | userleo |
1,891,854 | Como almacenar imágenes de docker en tu propio servidor (manualmente) | Estos últimos días estoy trabajando en temas de infraestructura para levantar una aplicación que... | 0 | 2024-06-18T02:28:45 | https://dev.to/oswa/como-almacenar-imagenes-de-docker-en-tu-propio-servidor-manualmente-5e0i | docker | Estos últimos días estoy trabajando en temas de infraestructura para levantar una aplicación que utiliza diferentes servicios.
Para el funcionamiento de esta aplicación, se necesita varios contenedores como base de datos, una aplicación brinda las APIS (Backend) y la aplicación del cliente final (Frontend).
Para poder testear la aplicación ya funcionando en un entorno de desarrollo se hace muy complicado porque [dockerhub](https://hub.docker.com/) solo permite subir una imagen privada, entonces estuve investigando como puedo almacenar mis propias imágenes en un servidor remoto. básicamente consta de 3 pasos
1. Construye tu contenedor.
```sh
docker build -t oswa/app-name .
```
2. Genera un archivo **.tar**.
```sh
docker save -o my-container.tar oswa/app-name
```
3. Sube tu archivo a tu hosting (servidor), s3 o tu servicio de almacenamiento de archivos.
4. Descargar tu archivo **.tar**
```sh
curl -o my-container.tar https://mypersonalhost.com/my-container.tar
```
5. Carga tu contendor a la lista de contenedores de ***docker***
```sh
docker load -i my-container.tar
```
Una vez hecho estos pasos puedes hacer ***(docker image ls)*** y veras tu contenedor agregada a la lista y ahora podrás usarlo solo con docker o con docker compose.
```yml
version: '3.8'
services:
my-app:
image: oswa/app-name:latest
container_name: my-app-react
ports:
- "80:80"
``` | oswa |
1,891,852 | java interview prep part 2 | Explain restcontroller annotation in springboot In Spring Boot, @RestController is a... | 27,757 | 2024-06-18T02:25:52 | https://dev.to/mallikarjunht/java-interview-prep-part-2-300i | ### Explain restcontroller annotation in springboot
In Spring Boot, @RestController is a specialized version of the @Controller annotation. It is used to indicate that the class is a RESTful controller that handles HTTP requests and directly maps them to the methods inside the class.
```java
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@GetMapping("/hello")
public String hello() {
return "Hello, World!";
}
}
```
Purpose of @RestController:
API Endpoint Handling:
@RestController combines @Controller and @ResponseBody. It is primarily used to create RESTful web services where HTTP requests (GET, POST, PUT, DELETE, etc.) are mapped directly to the methods in the class.
Automatic JSON/XML Conversion:
Methods in a @RestController return domain objects directly. Spring Boot automatically converts these objects into JSON or XML responses (based on the Accept header of the request) using Jackson or another configured message converter.
Simplification of Controller Code:
By annotating a class with @RestController, developers can streamline the code as they no longer need to add @ResponseBody to every request handling method.
### Explain microstructure architecture
Microservices Architecture:
Microservices Architecture is an architectural style that structures an application as a collection of loosely coupled services. Each service is self-contained, independently deployable, and typically focuses on performing a single business function.
Benefits of Microservices Architecture:
Scalability: Individual microservices can be scaled independently based on demand.
Flexibility and Agility: Enables rapid development, deployment, and updates of services.
Improved Fault Isolation: Failures are contained within a single service, reducing impact on the overall system.
Technology Diversity: Allows for the use of different technologies and frameworks for different services.
Enhanced Maintainability: Smaller, focused services are easier to understand, modify, and maintain compared to monolithic applications.
Challenges:
Increased Complexity: Managing a distributed system introduces complexity in deployment, testing, monitoring, and debugging.
Data Management: Maintaining consistency and managing data across multiple services can be challenging.
Service Discovery and Communication: Ensuring reliable communication and discovering services dynamically in a distributed environment.
Operational Overhead: Requires robust infrastructure and operational practices to support and monitor microservices effectively.
Microservices architecture can be categorized into several types or patterns, each emphasizing different aspects of service decomposition, communication patterns, and deployment strategies. Here are some common types of microservices architecture patterns:
### 1. **Monolithic Application Decomposition**:
- **Description**: In this approach, a monolithic application is decomposed into smaller services, but each service may still be relatively large and cohesive compared to other microservices architectures.
- **Characteristics**:
- Services are typically larger and might handle multiple related functionalities.
- Often uses synchronous communication (e.g., RESTful APIs) between services.
- Deployment and scaling are often handled per service, but still may share some components (e.g., databases).
### 2. **Layered Architecture**:
- **Description**: Services are organized into layers, where each layer represents a set of related functionalities or responsibilities.
- **Characteristics**:
- Each layer may be implemented as one or more microservices.
- Communication between layers can be synchronous or asynchronous.
- Promotes separation of concerns and scalability within each layer.
### 3. **Event-Driven Architecture**:
- **Description**: Services communicate through events (messages) asynchronously. Events represent state changes or significant actions within the system.
- **Characteristics**:
- Services are decoupled and communicate through message brokers or event buses.
- Enables loose coupling and scalability by allowing services to react to events without direct dependencies.
- Supports eventual consistency and fault isolation.
### 4. **API Gateway Pattern**:
- **Description**: An API Gateway acts as a single entry point for clients to interact with multiple microservices.
- **Characteristics**:
- Provides a unified interface for clients, routing requests to appropriate microservices.
- May handle authentication, rate limiting, and request aggregation.
- Improves client-side performance and simplifies the client's view of the system architecture.
### 5. **Service Mesh**:
- **Description**: A dedicated infrastructure layer for handling service-to-service communication, including load balancing, service discovery, encryption, and monitoring.
- **Characteristics**:
- Enhances visibility, reliability, and security of microservices communication.
- Typically implemented using a sidecar proxy (e.g., Envoy) alongside each microservice instance.
- Allows centralized management of microservices communication policies.
### 6. **Saga Pattern**:
- **Description**: Handles long-lived transactions that span multiple microservices, ensuring eventual consistency without distributed transactions.
- **Characteristics**:
- Uses a series of local transactions (compensating actions) within each microservice.
- Coordination and orchestration are typically managed by a Saga orchestrator.
- Enables rollback and compensation in case of failures, ensuring data consistency across microservices.
### 7. **Containerization and Orchestration**:
- **Description**: Microservices are deployed as lightweight, isolated containers (e.g., Docker) and orchestrated using platforms like Kubernetes.
- **Characteristics**:
- Simplifies deployment, scaling, and management of microservices.
- Provides infrastructure automation and supports microservices resilience.
- Enables efficient resource utilization and scalability through container orchestration.
### Conclusion:
Each type of microservices architecture pattern offers distinct advantages and is suitable for different scenarios based on scalability needs, communication requirements, and operational considerations. The choice of architecture pattern depends on factors such as application complexity, team expertise, scalability requirements, and operational goals.
| mallikarjunht | |
1,891,851 | The Best Video Downloader Online-AISaver | In today's digital era, video has become one of the key ways for people to access information,... | 0 | 2024-06-18T02:20:42 | https://dev.to/fu_tong_f21583307497eab78/the-best-video-downloader-online-aisaver-2785 | ai, video, learning, development | In today's digital era, video has become one of the key ways for people to access information, entertainment, and learning. However, there are times when we wish to save specific videos for future viewing or to watch them offline when there's no internet connection available. This is where using an online video downloader becomes a convenient option.
An online video downloader is a tool that allows users to download any online videos from various video-sharing websites onto their devices. These tools are typically user-friendly, requiring no software installation and can be operated directly within a web browser. Whether it's saving self-made videos or downloading valuable video resources from the internet, online video downloaders cater to users' needs.
[AISaver](https://aisaver.io/) is a versatile and potent any video downloader, catering to users' needs by accessing videos from over 1000 websites, including TikTok and Instagram. Its streamlined interface simplifies the downloading process – users input the video URL, and AISaver handles the rest, ensuring quick and hassle-free downloads.
Supporting various video formats like MP4, AVI, and MKV, AISaver accommodates diverse preferences and device compatibility requirements. Whether for offline viewing, archiving, or sharing, AISaver provides flexibility and convenience at every step.
Furthermore, AISaver offers advanced features like batch downloading and download scheduling, empowering users to customize their workflow efficiently. In essence, AISaver is the go-to choice for expanding multimedia libraries and enjoying favorite videos anytime, anywhere.
How to use [AISaver](https://aisaver.io/) to download any online video, follow these simple steps:
Open AISaver’s website in your browser.
Copy the URL of the video you want to download.
Paste the URL in the designated field on AISaver’s website.
Select the desired video quality and output format.
Click on the “Download” button to initiate the downloading process.
Once the download is complete, the video will be saved to your device. | fu_tong_f21583307497eab78 |
1,891,843 | Kring88 | Kring88: Platform Slot Online dengan Kemudahan Deposit Pulsa Dalam era digital yang serba canggih... | 0 | 2024-06-18T02:07:56 | https://dev.to/kring88/kring88-2j67 | bet, slotbet, webdev | Kring88: Platform Slot Online dengan Kemudahan Deposit Pulsa
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| kring88 |
1,891,850 | Solution of numerical calculation accuracy problem in JavaScript strategy design | When writing JavaScript strategies, due to some problems of the scripting language itself, it often... | 0 | 2024-06-18T02:20:29 | https://dev.to/fmzquant/solution-of-numerical-calculation-accuracy-problem-in-javascript-strategy-design-gg | javascript, strategy, trading, fmzquant | When writing JavaScript strategies, due to some problems of the scripting language itself, it often leads to numerical accuracy problems in calculations. It has a certain influence on some calculations and logical judgments in the program. For example, when calculating 1 - 0.8 or 0.33 * 1.1, the error data will be calculated:
```
function main() {
var a = 1 - 0.8
Log(a)
var c = 0.33 * 1.1
Log(c)
}
```
So how to solve such problems? The root of the problem is:
The maximum progress of floating-point values is 17 decimal places, but the accuracy is far worse than integers when performing operations; integers are converted to decimal when performing operations; and when calculating decimal operations in Java and JavaScript, both First convert the decimal decimal to the corresponding binary, part of the decimal can not be completely converted to binary, here is the first error. After the decimals are converted to binary, then the operation between the binary is performed to obtain the binary result. Then convert the binary result to decimal, where a second error usually occurs.
In order to solve this problem, I searched for some solutions on the Internet, and tested and used the following solutions to solve this problem:
```
function mathService() {
// addition
this.add = function(a, b) {
var c, d, e;
try {
c = a.toString().split(".")[1].length; // Get the decimal length of a
} catch (f) {
c = 0;
}
try {
d = b.toString().split(".")[1].length; // Get the decimal length of b
} catch (f) {
d = 0;
}
//Find e first, multiply both a and b by e to convert to integer addition, then divide by e to restore
return e = Math.pow(10, Math.max(c, d)), (this.mul(a, e) + this.mul(b, e)) / e;
}
// multiplication
this.mul = function(a, b) {
var c = 0,
d = a.toString(), // Convert to string
e = b.toString(); // ...
try {
c += d.split(".")[1].length; // c Accumulate the fractional digit length of a
} catch (f) {}
try {
c += e.split(".")[1].length; // c Accumulate the length of decimal places of b
} catch (f) {}
// Convert to integer multiplication, then divide by 10^c, move decimal point, restore, use integer multiplication without losing accuracy
return Number(d.replace(".", "")) * Number(e.replace(".", "")) / Math.pow(10, c);
}
// Subtraction
this.sub = function(a, b) {
var c, d, e;
try {
c = a.toString().split(".")[1].length; // Get the decimal length of a
} catch (f) {
c = 0;
}
try {
d = b.toString().split(".")[1].length; // Get the decimal length of b
} catch (f) {
d = 0;
}
// Same as addition
return e = Math.pow(10, Math.max(c, d)), (this.mul(a, e) - this.mul(b, e)) / e;
}
// Division
this.div = function(a, b) {
var c, d, e = 0,
f = 0;
try {
e = a.toString().split(".")[1].length;
} catch (g) {}
try {
f = b.toString().split(".")[1].length;
} catch (g) {}
// Similarly, convert to integer, after operation, restore
return c = Number(a.toString().replace(".", "")), d = Number(b.toString().replace(".", "")), this.mul(c / d, Math.pow(10, f - e));
}
}
function main() {
var obj = new mathService()
var a = 1 - 0.8
Log(a)
var b = obj.sub(1, 0.8)
Log(b)
var c = 0.33 * 1.1
Log(c)
var d = obj.mul(0.33, 1.1)
Log(d)
}
```
The principle is to convert the two operands to be calculated into integers to calculate to avoid accuracy problems. After calculation (according to the magnification when converted to integers), the calculation results are restored to obtain accurate results.
In this way, when we want the program to place an order when the market price plus a minimum price precision, we don’t have to worry about numerical accuracy
```
function mathService() {
.... // Omitted
}
function main() {
var obj = new mathService()
var depth = exchange.GetDepth()
exchange.Sell(obj.add(depth.Bids[0].Price, 0.0001), depth.Bids[0].Amount, "Buy 1 order:", depth.Bids[0])
}
```
Interested traders can read the code, understand the calculation process, welcome to ask questions, learn together and progress together.
From: https://www.fmz.com/digest-topic/5872 | fmzquant |
1,891,840 | Day 1 of My 90-Day DevOps Journey: Getting Started with Terraform and AWS | Hey everyone, I'm excited to share my 90-day DevOps journey! Each day, I'm diving into different... | 0 | 2024-06-18T02:13:02 | https://dev.to/arbythecoder/day-1-of-my-90-day-devops-journey-getting-started-with-terraform-and-aws-2d5g | devops, 90daysofdevops, terraform, beginners | Hey everyone, I'm excited to share my 90-day DevOps journey! Each day, I'm diving into different projects, learning, and documenting every step. Whether you're starting out or curious about Terraform and AWS, join me on this adventure!
### Getting Started with Terraform and AWS
So, I kicked off by exploring Terraform—an awesome tool for automating infrastructure across cloud providers like AWS. Think of it as your magic wand for spinning up servers and managing cloud resources.
**Challenges**: Initially, I struggled with Terraform's `.tf` configuration files. Getting the syntax right and understanding how to define resources took a bit of trial and error.
**Solutions**: I found that diving into the Terraform documentation and online tutorials helped clarify things. Also, joining forums and communities like Stack Overflow was a lifesaver for quick answers and tips.
### Deploying My First Web Server
My goal was to deploy a simple web server on AWS using Terraform—a real hands-on learning experience.
**Challenges**: After setting up the instance, I ran into a roadblock—my public IP wasn't loading in the browser. Frustrating, right?
**Solutions**: I double-checked my security group settings in AWS. Turns out, I needed to tweak the inbound rules to allow HTTP traffic on port 80 (`0.0.0.0/0` for the win!). It was about finding the balance between security and accessibility.
### Navigating Security Groups and Permissions
Configuring AWS security groups was a critical part of the process.
**Challenges**: Understanding CIDR notation (`0.0.0.0/0`) was a bit tricky at first. I wanted to allow traffic from any IP to access my web server securely.
**Solutions**: I made sure to review AWS VPC (Virtual Private Cloud) settings and network ACLs. This helped me refine the security group rules without compromising on safety.
### Debugging and Learning
Throughout this journey, I embraced the ups and downs of debugging.
**Challenges**: Encounter errors like `InvalidAMIID.NotFound` and `Unsupported block type`? Been there, solved that!
**Solutions**: Googling error messages became my second nature. Plus, reaching out to mentors and peers for guidance was invaluable. It's all about learning from mistakes and growing stronger in DevOps.
### Sharing My Experience
I'm excited to share my progress with you all. It's not just about the technical stuff—it's about the journey, the challenges, and the wins. If you're starting your DevOps journey or diving into cloud engineering, I hope my story encourages you to keep pushing forward.
| arbythecoder |
1,891,845 | Why is SEO So Important? How Does It Work? | Hello, everyone! Did you know? SEO is crucial for the success of websites. But why exactly is SEO so... | 0 | 2024-06-18T02:11:45 | https://dev.to/juddiy/why-is-seo-so-important-how-does-it-work-3n9e | seo, discuss, learning | Hello, everyone! Did you know? SEO is crucial for the success of websites. But why exactly is SEO so important? How does it work? Let's explore these questions together.
#### Why is SEO So Important?
1. **Increase Organic Traffic**: By optimizing your website to rank higher on Search Engine Results Pages (SERPs), you can attract more organic traffic. This means more potential customers visiting your site without having to pay for ads.
2. **Boost Brand Awareness**: High-ranking websites not only gain more traffic but also enhance brand credibility and awareness. Users are more likely to trust websites that appear at the top of search results.
3. **Improve User Experience**: SEO focuses on search engines and user experience. By optimizing your site’s speed, mobile compatibility, and content quality, you provide a better user experience, which increases satisfaction and retention.
4. **Achieve Long-Term Results**: Unlike paid ads, SEO is a long-term investment. It may take time to see results, but once you achieve good rankings, they can be maintained over the long run, providing ongoing traffic.
5. **Cost-Effective**: Compared to paid advertising, SEO is a more cost-effective marketing strategy. It generates traffic through natural rankings, reducing the reliance on advertising budgets.
#### How Does SEO Work?
1. **Keyword Research**: Understand what users are searching for, choose relevant keywords, and use them appropriately in your content. This makes it easier for search engines to find and index your site.
2. **Content Optimization**: Create high-quality, relevant content that meets user search needs. This includes using keywords, optimizing titles and meta descriptions, and adding internal links and multimedia elements.
3. **Technical Optimization**: Ensure your website’s technical structure is search engine friendly. This includes optimizing site speed, mobile-friendliness, SSL certificates, and XML sitemaps.
4. **Building Backlinks**: Gain backlinks from other high-authority websites to boost your site’s authority and credibility. This can be achieved through content marketing, social media promotion, and partnerships.
5. **User Experience (UX)**: Focus on site navigation, layout, loading speed, and other factors to improve user experience, reduce bounce rates, and increase the time visitors spend on your site.
#### Simplifying SEO Optimization
To make SEO optimization more accessible and efficient for website managers, we’ve developed [SEO AI](https://seoai.run/). This powerful tool can automatically analyze your site, evaluate keywords, provide scores, and offer optimization suggestions to help you quickly improve your search engine rankings. Whether you’re new to SEO or a seasoned professional, it can make your optimization efforts more effective and precise.
SEO is crucial because it helps you attract more visitors, enhance brand image, improve user experience, and save costs in the long run. Understanding and effectively implementing SEO strategies will bring sustained growth and success to your website.
I hope this helps you better understand the importance and mechanics of SEO! If you have any questions or would like to share your SEO experiences, please let us know in the comments. | juddiy |
1,891,844 | PHP HyperF -> Overhead + Circuit Breaker | HyperF - Project This test execute calc of Fibonacci to show how HyperF behaves with... | 0 | 2024-06-18T02:11:37 | https://dev.to/thiagoeti/php-hyperf-overhead-circuit-breaker-2fg2 | php, hyperf, overhead, circuitbreaker | ## HyperF - Project
This test execute calc of Fibonacci to show how HyperF behaves with overload, after use the maximum CPU and requests, the next requests do not respond, the system get into a circuit breaker.
#### Create - Project
```console
composer create-project hyperf/hyperf-skeleton "project"
```
#### Install - Watcher
```console
composer require hyperf/watcher --dev
```
#### Server - Start
```console
cd project ;
php bin/hyperf.php server:watch ;
```
## HyperF - PHP
Set a time limit of one minute just for testing.
```php
set_time_limit(60);
```
> Path: project/bin/hyperf.php
## HyperF - APP
#### APP - Config - Server
Limit to one process and one request at a time.
```php
return [
'settings' => [
Constant::OPTION_WORKER_NUM => 1,
Constant::OPTION_MAX_REQUEST => 1,
],
];
```
> Path: project/config/autoload/server.php
#### APP - Router
```php
Router::addRoute(['GET', 'POST'], '/stress', 'App\Controller\ControllerOverhead@stress');
Router::addRoute(['GET', 'POST'], '/data', 'App\Controller\ControllerOverhead@data');
```
> Path: project/config/routes.php
#### APP - Controller - Overhead
```php
namespace App\Controller;
class ControllerOverhead
{
public function fibonacci($number)
{
if($number==0)
return 0;
elseif($number==1)
return 1;
else
return ($this->fibonacci($number-1)+$this->fibonacci($number-2));
}
public function stress()
{
$time=microtime(true);
$fibonacci=$this->fibonacci(40);
$data=[
'time'=>microtime(true)-$time,
'fibonacci'=>$fibonacci,
];
return $data;
}
public function data()
{
$time=microtime(true);
$content='data';
$data=[
'time'=>microtime(true)-$time,
'content'=>$content,
];
return $data;
}
}
```
> Path: project/app/Controller/ControllerOverhead.php
## Execute
#### GET - Data
```console
curl "http://127.0.0.1:9501/data"
Response OK
```
#### GET - Stress
```console
curl "http://127.0.0.1:9501/stress"
Wait... Response OK
```
#### GET - Overload
```console
curl "http://127.0.0.1:9501/stress" && curl "http://127.0.0.1:9501/data"
Wait... Error -> Response only first request
```
## Conclusion
The greater the processing power and network of your server, the greater the HyperF configuration can be.
In HyperF is default settings, the number of workers is equal the number of CPUs, and 100k requests maximum.
---
[https://github.com/thiagoeti/php-hyperf-overhead-circuit-breaker](https://github.com/thiagoeti/php-hyperf-overhead-circuit-breaker)
| thiagoeti |
1,891,834 | Java prep for 3+ years | Tell me the difference between Method Overloading and Method Overriding in Java. with... | 27,757 | 2024-06-18T02:09:00 | https://dev.to/mallikarjunht/java-prep-for-3-years-4n8b | 1. Tell me the difference between Method Overloading and Method
Overriding in Java. with example
Method Overloading:
Method Overloading refers to defining multiple methods in the same class with the same name but different parameters. The methods can differ in the number of parameters, type of parameters, or both.
Key Points:
Method overloading is achieved within the same class.
It is also known as compile-time polymorphism or static polymorphism.
The return type may or may not be different, but the parameters must differ in type, sequence, or number.
```java
public class OverloadingExample {
// Method with the same name but different parameters
public int add(int a, int b) {
return a + b;
}
// Overloaded method with different parameter types
public double add(double a, double b) {
return a + b;
}
// Overloaded method with different number of parameters
public int add(int a, int b, int c) {
return a + b + c;
}
// Overloaded method with different sequence of parameters
public int add(int a, double b) {
return (int) (a + b);
}
}
```
Method Overriding:
Method Overriding occurs when a subclass provides a specific implementation of a method that is already provided by its superclass. The method in the subclass has the same name, parameter list, and return type as the method in the parent class.
Key Points:
Method overriding is achieved between a superclass and its subclass.
It is also known as runtime polymorphism or dynamic polymorphism.
The method signatures (name, parameters, return type) must be identical in both the superclass and subclass.
```java
// Superclass
class Animal {
public void makeSound() {
System.out.println("Animal makes a sound");
}
}
// Subclass overriding the makeSound() method
class Dog extends Animal {
@Override
public void makeSound() {
System.out.println("Dog barks");
}
}
public class Main {
public static void main(String[] args) {
Animal animal = new Animal();
animal.makeSound(); // Output: Animal makes a sound
Dog dog = new Dog();
dog.makeSound(); // Output: Dog barks
}
}
```
2. What do you mean by the class loader in Java?
It seems like you're summarizing the types of built-in class loaders in Java, and you've provided an overview of each type. Let's elaborate on each type of class loader based on your description:
### 1. Bootstrap Classloader
- **Description**: The Bootstrap Classloader is the first class loader that initiates when the JVM starts up. It is responsible for loading core Java classes from the bootstrap classpath, which typically includes the `rt.jar` file (or `classes.jar` in older JDK versions). These classes form the Java Standard Edition libraries.
- **Loaded Classes**: Classes loaded by the Bootstrap Classloader include fundamental Java classes like those in `java.lang`, `java.net`, `java.util`, `java.io`, `java.sql`, etc.
### 2. Extension Classloader
- **Description**: The Extension Classloader is the child class loader of the Bootstrap Classloader. It loads classes from the JDK's extension directories (`$JAVA_HOME/jre/lib/ext` by default). These directories contain optional extensions to the standard core Java classes.
- **Loaded Classes**: Classes loaded by the Extension Classloader typically include classes from JAR files located in `$JAVA_HOME/jre/lib/ext`.
### 3. System Application Classloader (Application Classloader)
- **Description**: The System Application Classloader, also known as the Application Classloader, is the child class loader of the Extension Classloader. It loads classes from the application classpath, which is set by the `CLASSPATH` environment variable or specified explicitly using the `-cp` or `-classpath` command-line option.
- **Loaded Classes**: Classes loaded by the Application Classloader include application-specific classes and third-party libraries that are included in the classpath.
### Class Loading Hierarchy Summary:
- **Bootstrap Classloader**: Loads core Java classes (`java.lang`, `java.util`, etc.) from the bootstrap classpath.
- **Extension Classloader**: Loads classes from extension directories (`$JAVA_HOME/jre/lib/ext`).
- **Application Classloader**: Loads classes from the application classpath (specified by `CLASSPATH` or `-cp` option).
### Why Understanding Class Loaders is Important:
- **Class Loading Flexibility**: Java's class loading mechanism allows applications to dynamically load classes at runtime, enabling features like plugin systems, dynamic class loading, and hot swapping.
- **Security and Isolation**: Class loaders provide a level of security and isolation, ensuring that classes from different sources (system libraries, extensions, applications) do not interfere with each other.
- **Customization**: Developers can create custom class loaders to load classes from non-standard sources or apply specific loading policies.
Overall, understanding the role of each built-in class loader in Java helps developers grasp how classes are loaded and managed within the JVM environment, facilitating effective application development and runtime behavior management.
3. What do you mean by inheritance in Java?
In Java, inheritance is a mechanism through which an object acquires all the properties and behavior of another class. It is usually used for Method Overriding and Code Reusability.
The concept of inheritance in Java is based on the fact that it creates new classes that are built upon the existing classes. Therefore, these methods and fields of the parent class can be reused if we inherit from an existing class. And also, we can add new methods and fields to our current class.
In Java, the inheritance is of five types-
1. Hybrid Inheritance
2. Hierarchical Inheritance
3. Single-level Inheritance
4. Multi-level Inheritance
5. Multiple Inheritance
```java
// Superclass
class Animal {
// Field
protected String name;
// Constructor
public Animal(String name) {
this.name = name;
}
// Method
public void eat() {
System.out.println(name + " is eating.");
}
}
// Subclass inheriting from Animal
class Dog extends Animal {
// Constructor
public Dog(String name) {
super(name); // Call to superclass constructor
}
// Additional method specific to Dog
public void bark() {
System.out.println(name + " is barking.");
}
}
// Main class to demonstrate inheritance
public class Main {
public static void main(String[] args) {
// Create an instance of Dog
Dog myDog = new Dog("Buddy");
// Access inherited method from Animal
myDog.eat(); // Output: Buddy is eating.
// Access method specific to Dog
myDog.bark(); // Output: Buddy is barking.
}
}
```
4. Why can we not override the static method in Java?
The reasons why we cannot override the static method in Java are :
(a) The static method does not belong to the object level. Instead, it belongs to the class level. The object decides which method can be called in the method overriding.
(b) In the static method, which is the class level method, the type reference decides on which method is to be called without referring to the object. It concludes that the method that is called is determined at the compile time.
If any child class defines the static method with the same signature as the parent class, then the method in the child class hides the method in the parent class.
```java
class SuperClass {
public static void staticMethod() {
System.out.println("Static method in SuperClass");
}
}
class SubClass extends SuperClass {
public static void staticMethod() {
System.out.println("Static method in SubClass");
}
}
public class Main {
public static void main(String[] args) {
SuperClass.staticMethod(); // Output: Static method in SuperClass
SubClass.staticMethod(); // Output: Static method in SubClass
}
}
```
5. Can you tell us what the Dynamic Method Dispatch is in Java?
Dynamic Method Dispatch in Java refers to the mechanism by which the correct method implementation is determined at runtime, based on the object type rather than the reference type. It enables polymorphic behavior in Java, allowing a subclass to provide a specific implementation of an inherited method.
```java
class Animal {
public void makeSound() {
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal {
@Override
public void makeSound() {
System.out.println("Dog barks");
}
}
class Cat extends Animal {
@Override
public void makeSound() {
System.out.println("Cat meows");
}
}
public class Main {
public static void main(String[] args) {
Animal animal1 = new Dog(); // Dog object
Animal animal2 = new Cat(); // Cat object
animal1.makeSound(); // Output: Dog barks
animal2.makeSound(); // Output: Cat meows
}
}
```
| mallikarjunht | |
1,891,842 | Enhancing Security with FacePlugin’s ID Card Recognition from 200 countries | Secure identity is essential in a world where connections are becoming more and more intertwined. Not... | 0 | 2024-06-18T02:07:34 | https://dev.to/faceplugin/enhancing-security-with-faceplugins-id-card-recognition-from-200-countries-52ba | programming, python, machinelearning, cybersecurity | Secure identity is essential in a world where connections are becoming more and more intertwined. Not only is it a technological achievement, but ID card recognition from 200 countries is essential for preserving security in our day-to-day lives.
The validity of identity documents is essential for entering sensitive places, opening a bank account, and boarding flights. This is where sophisticated systems come into play, providing dependable and effective identity document verification.
Identity fraud is becoming more sophisticated as the digital world grows. The ingenious strategies employed by fraudsters can no longer be defeated by the outdated techniques of authenticating identity documents.
Modern methods are now desperately needed by both governments and organizations to guarantee that each identity paper is authentic. FacePlugin, a pioneer in ID document recognition technology, is now available. Modern systems created by FacePlugin can identify identification documents from more than 200 countries, offering a strong barrier against identity theft and illegal access.
In this article, we will examine how FacePlugin is transforming this industry, and the critical function ID card recognition plays in strengthening security measures. We will go over FacePlugin’s technology’s extensive capabilities for recognizing and authenticating documents from across the world.
We’ll also look at the uses of this technology, including identifying passports and driver’s licenses, emphasizing the innovations and advantages these systems offer to different sectors of the economy.
By appreciating the value of ID card recognition and FacePlugin’s creative solutions, we can see how these technologies strengthen our society framework. The following will be the main areas of focus:
The importance of ID card recognition: examining how important it is for sophisticated recognition systems to stop identity theft and illegal access.
FacePlugin’s ID card recognition: An overview of FacePlugin’s state-of-the-art technology that demonstrates its dependability, accuracy, and speed.
Driver license recognition: Describing how FacePlugin improves and automates the driver license verification procedure.
Passport recognition: Examining the value of effective passport verification for border security and international travel is the topic of passport recognition.
We hope to clarify the revolutionary effects of FacePlugin’s technology on ID document verification and general security enhancement with an extensive tutorial.
Read full article here.
https://faceplugin.com/id-card-recognition-from-200-countries/ | faceplugin |
1,891,833 | Mastering TypeScript: Implementing Push, Pop, Shift, and Unshift in Tuples | Introduction So, here's a wild thought! What if I told you that we can use JS array... | 0 | 2024-06-18T02:05:50 | https://dev.to/keyurparalkar/mastering-typescript-implementing-push-pop-shift-and-unshift-in-tuples-5833 | typescript, javascript, webdev, beginners | ## Introduction
<img width="100%" style="width:100%" src="https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExN2ludHpiMHJoZ3h6dTB0bXl0dHFqb2hsaW53aDY4dzc1dGFoZGFpMyZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/l3fZLMbuCOqJ82gec/giphy.gif" alt="A wild thought image">
So, here's a wild thought! What if I told you that we can use JS array functions like `pop`, `push`, `shift`, `unshift` with Typescript tuple type? You might be like, why…why would we even need that? Isn't TS already hard enough? Who on earth would want to make it even more complex?
Look, I did warn you that this is a bit out there. I've kinda become a Typescript fanatic recently and I love digging into some bizarre TS stuff. Plus, it's not just for kicks. It also helps us understand a few crucial TS concepts that can come in handy when crafting your own utilities.
So let me grab your attention and share with you what we are gonna be doing.
> 💡 NOTE: This blog post is totally inspired by Typescript challenges here: https://github.com/type-challenges/type-challenges?tab=readme-ov-file The utilities mentioned in this blog were part of these challenges.
## What are we gonna do
Its simple we are building typescript utility generics that does same operations as functions of an Array like push pop etc.
Here are some examples,
```tsx
type Pop<T extends unknown[]> = T extends [...infer H, unknown] ? H : []
type Shift<T extends unknown[]> = T extends [unknown, ...infer T] ? T : []
type Push<T extends unknown[], I extends unknown> = [...T, I]
type Unshift<T extends unknown[], I extends unknown> = [I, ...T]
type popRes = Pop<[3, 2, 1]>
type shiftRes = Shift<[3, 2, 1]>
type pushRes = Push<[3,2,1], 0>
type unshiftRes = Unshift<[3,2,1], 4>
```
## Getting Started
<img width="100%" style="width:100%" src="https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExanU0eHM3MmZhM3hqc3h0Nm9kYmN2NmxhY3psb3VjZWY0aWoyYTV5dCZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/Yy6GhtIk8l76u8nlIF/giphy.gif" alt="Let us get started image">
Before we dive into the implementation of these utilities we first need to understand couple of basic things in TypeScript:
### 1. Tuple Types
A tuple type is similar to an `Array` type which has known types at the specified index position. A typical example of tuple would like below:
```tsx
type TupleType = [number, boolean];
```
Here `TupleType` is a tuple type with `number` type being at position `0` and `boolean` type at position `1`. Analogous to Javascript arrays, if you try to index tuple type out of its bounds we will get an error
```tsx
type res = TupleType[2] // <------ Tuple type 'TupleType' of length '2' has no element at index '2'
```
For more information on typescript tuple type read its documentation here: [TS Tuple Types](https://www.typescriptlang.org/docs/handbook/2/objects.html#tuple-types)
### 2. Variadic Tuples
Variadic tuples were introduced in Typescript via this [PR](https://github.com/microsoft/TypeScript/pull/39094). According to the PR, variadic tuples are:
> *The ability for tuple types to have spreads of generic types that can be replaced with actual elements through type instantiation*
>
Some examples of variadic tuples are as follows:
```tsx
type WrapWithStringAndBool<T extends Array<unknown>> = [string, ...T, boolean];
type res = WrapWithStringAndBool<[1,2,3,4]> // <-- [string, 1, 2, 3, 4, boolean]
```
If you checkout the above example, we have `WrapWithStringAndBool` generic that accepts an array of unknowns and returns a tuple with `string` and `boolean` tupes at the first and the last position in the tuple.
Here the `...T` is the variadic element which acts as a placeholder for values from the input `T`.
Variadic tuples has a lot to offer and is a great piece of feature. I would like recommend to go through its rules and examples mentioned in this [PR](https://github.com/microsoft/TypeScript/pull/39094).
### 3. Conditional Types
Every developer knows the `if` `else` block that helps you to write conditional code. In the similar way, Typescript conditional types take the following format: `condition ? trueBranch : falseBranch`. This is very much similar to the [ternary operator in JS](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_operator).
For a type to become conditional, the `condition` part should consist of `extends` keyword:
```tsx
Type extends OtherType ? trueBranch : falseBranch
```
Were `Type` if matches with `OtherType` then `trueBranch` is executed or else the `falseBranch`.
Conditional Types can also be used to narrow the types to provide specific types. Consider the following example from [Typescript cheatsheet](https://www.typescriptlang.org/cheatsheets/):
```tsx
type Bird = { legs: 2 };
type Dog = { legs: 4 };
type Ant = { legs: 6 };
type Wolf = { legs: 4 };
type HasFourLegs<Animal> = Animal extends { legs: 4 } ? Animal : never;
type Animals = Bird | Dog | Ant | Wolf;
type FourLegs = HasFourLegs<Animals>; // <--- Dog | Wolf
```
Here we have 4 types `Bird` `Dog` `Ant` and `Wolf` with their respective legs property. Next, we have built `HasFourLegs`. It does the following thing:
- It compares `Animal` object with `{ legs: 4 }` object with the help of `extends` keyword.
- If they are equal, `Animal` is returned or else nothing is returned.
In the last line we make use of `HasFourLegs` by passing it the `Animals` union type. A thing to note here is that, when an Union type is provided to the left side of the `extends` keyword then all the values of Union are distributed such that each value is tested against the object `{ legs: 4 }`. You can read more about the distributive nature of unions over [here](https://www.typescriptlang.org/docs/handbook/2/conditional-types.html#distributive-conditional-types).
### 4. Inferring Within Conditional Types
Conditional types can also be used to infer types when we do comparison with the help of `infer` keyword. For example, consider the TS utility [ReturnType](https://www.typescriptlang.org/docs/handbook/utility-types.html#returntypetype). This utility returns the return type of the function that is being passed to it. Internally it works in the following ways:
```tsx
type GetReturnType<T extends (...args: any[]) => any> = T extends (...args: any[]) => infer R ? R : never;
type res = GetReturnType<() => number> // <--- number
```
In the `trueBranch` of the above example if you closely observe that we make use of `infer R`. Here we tell TS like while comparing if `T` matches the format to the right of `extends` then place the return type of function in `R`.
When we pass `() => number` to the `GetReturnType` a number is returned since it matches the format to the right of `extends` keyword in the generic.
Now that we are clear with our basics, let us start with writing our first utility. `Pop`
## Pop
<img width="100%" style="width:100%" src="https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExZmg1YTlhYWN4eTdua2x5OXdibmQ4OTRyMDc1YXYzbDd0bzZmN2hhbSZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/vN2VlOnSeLd6UJsdRx/giphy.gif" alt="Pop in TS image">
In Javascript a `pop` function would remove the last element of an array. To build this in Typescript, we do the following:
```tsx
type Pop<T extends unknown[]> = T extends [...infer H, unknown] ? H : []
```
Let me example what is happening here:
- We tell TS that `Pop` is going to be our generic with parameter `T` which can be an array of `unknown`s.
- Next, with the help of this: `T extends [...infer H, unknown]` we tell TS that the first N-1 elements of the tuple/array T should be inferred with H and the Nth i.e. the last element should be inferred as unknown.
- If the Tuple T matches this pattern then `H` is returned or else we return an empty array.
## Shift
<img width="100%" style="width:100%" src="https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExaDExcGF6cndpYm5zczFzeXI2OHJqM3N2bzAxdWVzZ29obTEwdmJ4eCZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/xTiTnu8nhFODl7Fvdm/giphy.gif" alt="Shift in TS image">
Javascript array’s has another built-in function that helps you to remove its first element. This is an in-place operation that affects the original array. The returned value by this function is an array’s first element. Here is a quick look of this function:
```tsx
let x = [1, 2, 3, 4];
const firstElement = x.shift();
firstElement // <----- 1
x // <----- [2, 3, 4]
```
Similar to `shift` function, we can create a generic utility in Typescript that removes the first element from a tuple type. Here is how it’s the utility will look like:
```tsx
type Shift<T extends unknown[]> = T extends [unknown, ...infer R] ? R : []
```
The `Shift` utility here expects it’s input to be an tuple. In this case, since we don’t exactly know the types inside the tuple hence we extend input `T` as `unkown[]`
To the right hand side, we have:
- We are making using of conditional types, were we check if `T` matches the following pattern `[unknown, ...infer R]`.
- We can also identify the things that we learned in the getting started section.
- We make use of `extends` keyword to create a conditional types.
- We also make use of variadic tuple types, where in the right side tuple of `extends` we have a inferential variadic element `R`
- If the condition is met we return `R` which is the remaining element of the tuple.
## Push & Unshift
<img width="100%" style="width:100%" src="https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExdGx6ZGJ2eTcwcmk0aDl4ZnZnNTByeDAwcjlqN3pobXU2OXZrd2xseiZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/VfNFqPmYorydG/giphy-downsized.gif" alt="Shift in TS image">
Similar to Javascript’s push built-in function that appends a new element to the array, we can also create a similar utility:
```tsx
type Push<T extends unknown[], I extends unknown> = [...T, I]
```
This is one of the simplest utility from all. The key aspect of this Utility is that,
- We make use of destructing of tuple concept with `...T` inside a new tuple.
- To this tuple at the end we add `I`
- Together this utility would return a new tuple type that combines the elements from `T` and adds `I` at the end.
Here is the result for the same:
```tsx
type res = Push<[1,2,3], 4>
res // <----- [1, 2, 3, 4]
```
Similar to this we have `Unshift` as well:
```tsx
type Unshift<T extends unknown[], I extends unknown> = [I, ...T]
```
## Summary
In this blog post, we covered:
- Tuple Types
- Conditional Types
- Variadic Tuple Types
- Conditionally Inferred Types
Lastly, we explored the `Push`, `Pop`, `Shift`, and `Unshift` generic utilities in TypeScript, which are analogous to their JavaScript counterparts.
Thanks a lot for reading my blogpost.
You can follow me on [twitter](https://twitter.com/keurplkar), [github](http://github.com/keyurparalkar), and [linkedIn](https://www.linkedin.com/in/keyur-paralkar-494415107/). | keyurparalkar |
1,891,841 | A Comprehensive Guide to Using Footers in Conventional Commit Messages | Introduction Traditional commit messages are a crucial part of maintaining a clean,... | 0 | 2024-06-18T02:04:58 | https://dev.to/mochafreddo/a-comprehensive-guide-to-using-footers-in-conventional-commit-messages-37g6 | git, versioncontrol, softwareengineering, conventionalcommits | ### Introduction
Traditional commit messages are a crucial part of maintaining a clean, traceable history in software projects. An important component of these messages is the footer, which serves specific purposes such as identifying breaking changes and referencing issues or pull requests. This guide will walk you through the different types of footers, their nuances, and how to use them effectively.
### Structure of a Conventional Commit Message
A typical Conventional Commit message is structured as follows:
```
<type>(<scope>): <subject>
<BLANK LINE>
<body>
<BLANK LINE>
<footer>
```
### Types of Footers
#### 1. Breaking Changes
- **Purpose**: To indicate significant changes that are not backward-compatible.
- **Example**:
```
BREAKING CHANGE: The API endpoint `/users` has been removed and replaced with `/members`.
```
#### 2. Issue and Pull Request References
These footers link your commits to issues or pull requests in your project management system.
##### Fixes / Closes / Resolves
- **Purpose**: To close an issue or pull request when the commit is merged.
- **Nuances**:
- **Fixes**: Typically used when the commit addresses a bug.
- **Closes**: Used to indicate that the work described in the issue or PR is complete.
- **Resolves**: A general term indicating that the commit resolves the mentioned issue or PR.
- **Examples**:
```
Fixes #123
Closes #456
Resolves #789
```
##### Related / References
- **Purpose**: To indicate that the commit is related to, but does not necessarily close, an issue or pull request.
- **Examples**:
```
Related to #101
References #202
```
#### 3. Co-authored-by
- **Purpose**: To credit multiple contributors to a single commit.
- **Example**:
```
Co-authored-by: Jane Doe <jane.doe@example.com>
```
#### 4. Reviewed-by
- **Purpose**: To acknowledge the person who reviewed the commit.
- **Example**:
```
Reviewed-by: John Smith <john.smith@example.com>
```
#### 5. Signed-off-by
- **Purpose**: To indicate that the commit complies with the project’s contribution guidelines, often seen in projects using the Developer Certificate of Origin (DCO).
- **Example**:
```
Signed-off-by: Alice Johnson <alice.johnson@example.com>
```
#### 6. See also
- **Purpose**: To reference related issues or pull requests that are relevant to the commit.
- **Example**:
```
See also #321
```
### Putting It All Together
Here’s an example of a Conventional Commit message utilizing multiple footer types:
```
feat(auth): add OAuth2 support
Added support for OAuth2 login to enhance security and user convenience. This includes the implementation of authorization code flow and token management.
BREAKING CHANGE: The old authentication method using API keys has been removed. All clients must now use OAuth2.
Fixes #101
Related to #202
Reviewed-by: John Smith <john.smith@example.com>
Co-authored-by: Jane Doe <jane.doe@example.com>
Signed-off-by: Alice Johnson <alice.johnson@example.com>
See also #303
```
### Conclusion
Using footers in Conventional Commit messages effectively can greatly enhance the clarity and maintainability of your project’s history. By understanding and properly employing footers such as `BREAKING CHANGE`, `Fixes`, `Closes`, `Resolves`, `Related to`, `Co-authored-by`, `Reviewed-by`, `Signed-off-by`, and `See also`, you can ensure that your commits are informative and that your project management tools can automate the handling of issues and pull requests efficiently.
### References
- [Conventional Commits](https://www.conventionalcommits.org/)
- [Developer Certificate of Origin](https://developercertificate.org/)
- [Example Shell Script for Setting Up Husky](https://gist.github.com/mochafreddo/7fc9b608869ff3bceae9a89b16479998)
By following these guidelines, software engineers can maintain a more structured and informative commit history, aiding both current project maintenance and future development efforts. | mochafreddo |
1,891,839 | Integrating the Snyk Language Server with IntelliJ IDEs | We’re excited to announce that the Snyk Language Server (LS for short) can now be integrated with your existing IntelliJ IDEs. | 0 | 2024-06-18T02:00:24 | https://snyk.io/blog/integrating-snyk-language-server-with-intellij-ide/ | applicationsecurity | We’re excited to announce that the [Snyk Language Server](https://docs.snyk.io/integrate-with-snyk/use-snyk-in-your-ide/snyk-language-server) (LS for short) can now be integrated with your existing IntelliJ IDEs.
Why do we integrate our IDEs with the LS?
-----------------------------------------
By integrating all our IDE plugins with LS, we reduce code duplication. This streamlines future development by minimizing rework and reducing vulnerabilities.
The LS protocol is a natively supported standard in all modern IDEs, so we benefit from deep integration within the IDE. LS also works in a separate thread, giving us additional multi-threading and non-blocking benefits.
LS brings new capabilities into IntelliJ IDEs
---------------------------------------------
### Automatic scanning
One of the most exciting new capabilities is **automatic scanning.** With this update, the Snyk Language Server will run a scan after start-up and after every file save, providing developers with a quick feedback loop.
You can customize these processes to fit your development workflows in the User experience settings.
### Snyk Learn integration
LS simplifies developer education by integrating with [Snyk Learn](https://learn.snyk.io/).If the IDE finds a vulnerability that is covered by a Snyk Learn lesson, it automatically provides a link to the lesson in addition to the required fix so that developers can more easily recognize and mitigate similar security issues in the future.
### DeepCode AI Fixsupport
DeepCode AI Fix combines the power of a thorough program analysis engine with the abilities of an in-house deep learning-based large language model. This combination allows for compiling large amounts of unstructured language information from open source code.
With this update, if our DeepCode AI engine identifies an opportunity for an automatic vulnerability fix, it will highlight the issue with a lightning icon and provide a clickable action.
**This functionality is currently in early access and only available for Enterprise plans.** Visit the [DeepCode AI documentation](https://docs.snyk.io/scan-with-snyk/snyk-code/manage-code-vulnerabilities/fix-code-vulnerabilities-automatically) to learn more.
LS updates
----------
Integrating the Snyk Language Server into your IntelliJ IDEs will help you produce better, more secure code by automating many of the mandatory development processes. Stay tuned to learn about future new and exciting features.
| snyk_sec |
1,890,677 | Food tracker app (Phase 1/?) for show how you split your money | Hi everyone, in this post I will share the process of creating a food tracker app that tells you how... | 0 | 2024-06-18T01:00:41 | https://dev.to/caresle/food-tracker-app-phase-1-for-show-how-you-split-your-money-3p8e | laravel, redis, react, postgres | Hi everyone, in this post I will share the process of creating a food tracker app that tells you how you split your money across the different stores and food that you purchase.
## Why are you building this?
Right now I’m having a transition on my life, where I want to move from the house of my mother to start living alone, and one important thing when you start to live alone is the food, specially when you have a limit budget from where you can purchase your food.
With that two things in mind and considering that I most of the time eat the same things, I wanted to have some kind of app to see what food I regularly bought and compare the different price of these across different stores to get the same food for the cheapest price possible.
## Stack for the application
The stack for the application not only consists on which technologies we’re going to build the app, but also how will be deployed and how we will split the work for the project.
### Technologies for the development of the app
### Frontend
For the frontend part we will be using react js and typescript. Alongside the ui component from shadcn, the tanstack query and tanstack router packages and finally the zustand statemanagment package.
### Backend
For the backend we will have our friend laravel for supporting all the creationg of the database through the migrations, the integration with redis and providing the api support.
### Databases
For the databases we will have postgresql as the main db, alongside a redis instance for handling basic cache of the pagination of the api and the stores and food part of the applicatIon.
### Technologies for the management of the task of the project
I will be using jira for the task managment and the issues of github for getting a general idea of what is missing from the project.
### Technologies for the deploy of the app
I will be using railway for the deploy of the application because I see that you can deploy laravel project on it and also because have a free trial that gives you 5 dollars to get started with the platform.
## Development of the app
At the beginning I create a simple repo on github with the next structure
```bash
frontend # for the react project
backend # for the laravel project
docs # for documentation of the project
```
I started the react project using pnpm, meanwhile I use laragon for my local development for laravel (because I’m on windows and laragon comes with the possibility to start a redis service).
After the initialization of both projects I focus on developing the ui of the application because it’s one of the things that took me a lot of time, after having the main screen of the application (food, stores and entries) I move to the backend to start with the development of the api.
### Database diagrams
Next are the diagrams for the tables of the app, I use the laravel migrations for building the database, but this will be the equivalent diagrams.
The database is in `postgresql` .
### Overview of the backend
The backend consists of only of the endpoint of the api alongside with the services for the redis integration. The reason for this is because I will the only one to use the app, so I don’t need users for this app.
### Redis integration
The integration of redis was using the predis package alongside of a service for exposing the main actions for all the controllers, for saving, remove and get keys of the app.
### Overview of the frontend
In the frontend we use `zustand` for the state of the app, alongside `shadcn` components with tailwind and `tanstack router` and `query` packages.
The main problem with the frontend was to create the charts for the user to see their summary of the app.
## Deploy of the app
For deploying the app we will be using `railway` because has a trial of 5 dollars to test the service.
### Final look of the app
This is how our deploy is going to look at the end of this section
### Frontend service
Because the repository for the project contains both `frontend` and `backend` for the deploy the way that I found to work was to have two different services.
In the frontend service we set the root directory to point to the folder that contains the frontend in my case is `frontend` Also setup the env variable for the api as show below:
### Backend
For the backend we need to add a `NIXPACKS_BUILD_CMD` for work better with the laravel app. Also the setup for this service is the same as the frontend part
The nix command it’s the next one
```bash
composer install && npm install --production && php artisan optimize && php artisan config:cache && php artisan route:cache && php artisan view:cache && php artisan migrate --force
```
### PostgreSQL y Redis
For redis and postgres is as easy like click on `create` button and search for the database and redis service.
## Final words about the app and next steps
Right now the app as completed the first state of it, store the data and give a basic report to the final user about their current expenses. But there is still a long way to become a really good app, one of the parts that I want to improve in future version are the UI and UX of the app. Alongside with the posibility of adding users.
Here are some screenshots of how the app currently looks
| caresle |
1,891,838 | Streamlining Security in the Digital Age—Building ID Verification System with SDKs | Building ID verification system with SDKs is becoming more and more important in today’s digital... | 0 | 2024-06-18T01:58:46 | https://dev.to/faceplugin/streamlining-security-in-the-digital-age-building-id-verification-system-with-sdks-25e3 | programming, ai, machinelearning, computerscience | Building ID verification system with SDKs is becoming more and more important in today’s digital environment, where trust and security are critical. Accurate and efficient identity verification becomes more and more important as interactions and transactions shift to the Internet.
ID verification systems are made to make sure that someone is who they say they are, protecting private data, preventing fraud, and guaranteeing that laws and regulations are followed.
Let’s say you are ready to complete an important online transaction, but the system freezes because your identity cannot be confirmed. Yes, it is frustrating. Imagine for a moment a world in which this verification is quick, easy, and safe. This is it: using SDKs to build ID verification systems is the future of internet security. Explore how these potent instruments are transforming identity protection in the digital era.
Fraud and identity theft are growing more common in the digital age. To protect their business and keep customers’ trust, companies require reliable ways to confirm the identities of their users. The outdated techniques of ID verification, which frequently entail physical paperwork and manual checks, are no longer adequate. They take a lot of time, are prone to mistakes, and have security flaws.
Software development kits (SDKs) are useful in this situation. With the help of SDKs, developers may more easily include sophisticated features in their apps by giving them access to a collection of tools and libraries.
SDKs provide a streamlined and effective means of integrating cutting-edge verification technologies into ID verification systems. These technologies include artificial intelligence, document scanning, biometric analysis, and face recognition enhance the accuracy and security of the verification process.
Developers can create ID verification systems that are more user-friendly and safer by utilizing SDKs. Verification procedures can be finished by users swiftly and simply, without the need for laborious documentation or protracted wait times.
When combined with the increased security measures that SDKs offer, this better user experience makes them an indispensable tool in the battle against identity theft. To sum up, using SDKs in the development of ID verification systems is a progressive strategy that tackles the issues surrounding contemporary digital security. SDKs are essential to the development of safe, effective, and user-friendly ID verification systems because they integrate cutting-edge technology and streamline the verification procedure.
Read full article here.
https://faceplugin.com/building-id-verification-system-with-sdks/ | faceplugin |
1,891,836 | Finding the Best Plumbers in Dublin | If you are looking for reliable plumbing services in Dublin, there are several top-notch options... | 0 | 2024-06-18T01:46:41 | https://dev.to/farooqshah/finding-the-best-plumbers-in-dublin-5gen | If you are looking for reliable [plumbing services in Dublin,](https://dublinplumber24hrs.ie/) there are several top-notch options available. Here’s a brief overview of some highly recommended plumbers in the city.
1. Philip Marry Heating & Plumbing
Philip Marry Heating & Plumbing offers comprehensive plumbing and heating solutions. Known for their professionalism and competitive pricing, they provide services such as:
Boiler maintenance: Including servicing for oil and gas boilers.
General plumbing repairs: Fixing toilets, showers, and more.
Underfloor heating solutions: Ensuring efficient and effective heating options for your home.
Customers praise their intelligent diagnosis, efficient repairs, and excellent aftercare advice, making them a trusted choice in Dublin (Hey Dublin).
2. dublinplumber24hrs
dublin Plumbers provide 24/7 emergency services and have a solid reputation in Dublin. They have serviced over 15,000 homes and businesses, offering a broad range of services such as:
Emergency plumbing: Available around the clock for urgent issues.
Boiler services: Including installation, repair, and maintenance.
General plumbing: Handling leaks, blockages, and other common issues.
They are known for their prompt response times and professional service, ensuring that your plumbing problems are resolved quickly and effectively (Dewar Plumbers).
3. 24 Hour Plumber
24 Hour Plumber is another excellent option, especially for emergency situations. Their key services include:
Emergency repairs: Available at any time of day or night.
General maintenance: Including replacing taps, fixing toilet valves, and more.
Boiler repairs: Specializing in both repair and servicing of gas boilers.
Customers appreciate their timely service, professionalism, and reasonable pricing, making them a reliable choice for both emergency and routine plumbing needs (24 Hour Plumber ®).
Choosing the Right Plumber
When selecting a plumber, consider the following factors:
Availability: Emergency services are crucial for urgent plumbing issues.
Range of Services: Ensure they offer the specific services you need.
Customer Reviews: Look for positive feedback regarding their reliability, professionalism, and pricing.
Experience and Qualifications: Opt for plumbers who are experienced and qualified to handle various plumbing tasks.
By keeping these factors in mind and considering the recommended options above, you can find a reliable plumber in Dublin to address your needs efficiently. For more information, visit their respective websites or contact them directly to discuss your requirements and obtain quotes.https://dublinplumber24hrs.ie/ | farooqshah | |
1,891,351 | Best ERP 2024 ? | which brand erp should we choose for 2024 for these criteria... | 0 | 2024-06-18T01:41:09 | https://dev.to/paimonchan/best-erp-2024--2p85 | which brand erp should we choose for 2024 for these criteria ?
- pricing
- customization
- features
- performance
- ease of use | paimonchan | |
1,891,822 | Little Bugs, Big Problems | Software Engineering Manager: “Why haven’t you finished this bug? It’s been in implementation for... | 0 | 2024-06-18T01:32:37 | https://dev.to/mlr/little-bugs-big-problems-59gg | bugs, career, softwaredevelopment, software | **Software Engineering Manager:** “Why haven’t you finished this bug? It’s been in implementation for three days… it’s just a bug, it shouldn’t be this hard.”
**Developer:** “...”
This interaction is common in software engineering. In this article, I’ll discuss how bugs are perceived by management, product owners, developers, and others involved in the development process. I’ll elaborate on perceptions of priority, work effort, and impact with examples from my experience.
Three common themes with bugs in past organizations:
1. **UI Bugs are Top Priority:** Management and product owners often see non-UI bugs as less important.
2. **Bugs are Easy to Fix:** Bugs are perceived as less complex than creating new features.
3. **Developers are too Skilled to Write Bugs:** Insufficient code reviews lead to bug-prone codebases.
## Why These Perceptions Exist
### UI Bugs are Top Priority
Some managers and product owners prioritize the visual interface as the most valuable part of the software, disregarding how functionality issues elsewhere affect the interface.
### Bugs are Easy to Fix
Teams think bugs are easy to fix because the feature’s code is already written. However, it often requires more than a few tweaks.
### Developers are too Skilled to Write Bugs
Without an engineering framework, the development process becomes disorganized. Lack of code reviews leads to isolated and complex bugs, weakening software architecture.
> “Just don’t write bugs…”
> — Every software engineering manager ever.
I’m not advocating for the above quote. We all write bugs. The key is changing how teams perceive the work needed to fix bugs, reducing complexity, and improving interactions about bugs among team members.
## Examples
### Organization 1: Mobile Developer for Hire
I worked on a small team building mobile apps with high turnover due to a lack of structure. Developers were frustrated by endlessly fixing broken code without checks and balances. The codebase was a giant ball of mud—functions were tightly coupled, state was unmanaged, and a single class managed everything.
I was tasked with fixing a UI bug, while 100+ non-UI bugs affecting measurement accuracy were ignored. After two weeks without progress, I proposed organizing around trunk-based development, implementing code reviews, and refactoring the architecture. This plan took months, but we eventually fixed the controls bug and many others.
### Organization 2: Enterprise Data Analysis Software
Enterprise software always seems riddled with bugs. At one organization, a bug titled “Issue with Customer Interactions Populating” required refactoring the state management system. Management thought bugs were easy to fix because the code was already written. It took days to identify the problem and refactor the system, fixing several other data issues along the way.
Despite showing my progress, the manager was frustrated by the time taken. In the end, the codebase improved, but I didn’t receive recognition.
### Organization 3: Big Finance
Financial software requires 24/7 uptime. This team believed experienced developers didn’t write bugs, leading to a lack of code reviews and collaboration. Critical bugs caused production rollbacks and hotfixes, wasting time and causing blame.
We proposed requiring two code reviewers per PR to ensure quality. This change boosted code quality and caught bugs early. Pair programming and mentorship improved team health and software quality.
## Conclusion
Misconceptions about bugs being easy to fix, less important than UI issues, and the idea that skilled developers don’t write bugs lead to challenges. Recognizing the true complexity of bugs, prioritizing structured code reviews, and fostering better communication can enhance code quality, reduce frustrations, and deliver reliable software solutions.
Please let me know if you want to hear more about my thoughts on development, the software engineering industry, or related topics. Thanks for reading! | mlr |
1,891,832 | Idconfig | I didn't know that If you want to get'Idconfig' you should use'Ifconfig' | 0 | 2024-06-18T01:26:22 | https://dev.to/nicholas_cheza_4d291be7f2/idconfig-7ob | programming | I didn't know that If you want to get'Idconfig' you should use'Ifconfig' | nicholas_cheza_4d291be7f2 |
1,891,831 | Teach you to encapsulate a Python strategy into a local file | Many developers who write strategies in Python want to put the strategy code files locally, worrying... | 0 | 2024-06-18T01:25:43 | https://dev.to/fmzquant/teach-you-to-encapsulate-a-python-strategy-into-a-local-file-1knn | python, strategy, cryptocurrency, fmzquant | Many developers who write strategies in Python want to put the strategy code files locally, worrying about the safety of the strategy. As a solution proposed in the FMZ API document:
**Strategy security**
The strategy is developed on the FMZ platform, and the strategy is only visible to the FMZ account holders. And on the FMZ platform, the strategy code can be completely localized, for example, the strategy is encapsulated into a Python package and loaded in the strategy code, so that the strategy localization is realized.
For more details, please go to: https://www.fmz.com/api
In fact, this kind of worry is not necessary, but since there are such needs, we shall provide a complete implementation example.
## Encapsulate a strategy
Let's find a simple Python strategy for demonstration, using the classic Dual Thrust strategy, strategy address: https://www.fmz.com/strategy/21856
We strive not to change any part of the strategy code, encapsulate the strategy into a file that can be called by the strategy code on the FMZ platform, and the execution result is exactly the same as running the strategy directly. The biggest problem with encapsulation is that the global objects, global functions, and constant values called by the strategy code on the FMZ platform cannot be accessed in the files we encapsulate, so we must find a way to pass these objects, functions, variables, and constants to the encapsulated file. let's do it step by step.
- Copy the [Python version of the Dual Thrust OKCoin futures strategy code](https://www.fmz.com/strategy/21856) and paste it into the local Python file. The local Python file is named testA.
Paste into the file testA opened by the local editor.
Add some code, and keep the strategy code part copied and pasted intact
```
# Function, object
exchanges = None
exchange = None
Log = None
Sleep = None
TA = None
Chart = None
LogProfitReset = None
LogStatus = None
_N = None
_C = None
LogProfit = None
# Strategy parameters
ContractTypeIdx = None
MarginLevelIdx = None
NPeriod = None
Ks = None
Kx = None
AmountOP = None
Interval = None
LoopInterval = None
PeriodShow = None
# constant
ORDER_STATE_PENDING = 0
ORDER_STATE_CLOSED = 1
ORDER_STATE_CANCELED = 2
ORDER_STATE_UNKNOWN = 3
ORDER_TYPE_BUY = 0
ORDER_TYPE_SELL = 1
PD_LONG = 0
PD_SHORT = 1
def SetExchanges(es):
global exchanges, exchange
exchanges = es
exchange = es[0]
def SetFunc(pLog, pSleep, pTA, pChart, pLogStatus, pLogProfitReset, p_N, p_C, pLogProfit):
global Log, Sleep, TA, Chart, LogStatus, LogProfitReset, _N, _C, LogProfit
Log = pLog
Sleep = pSleep
TA = pTA
Chart = pChart
LogStatus = pLogStatus
LogProfitReset = pLogProfitReset
_N = p_N
_C = p_C
LogProfit = pLogProfit
def SetParams(pContractTypeIdx, pMarginLevelIdx, pNPeriod, pKs, pKx, pAmountOP, pInterval, pLoopInterval, pPeriodShow):
global ContractTypeIdx, MarginLevelIdx, NPeriod, Ks, Kx, AmountOP, Interval, LoopInterval, PeriodShow
ContractTypeIdx = pContractTypeIdx
MarginLevelIdx = pMarginLevelIdx
NPeriod = pNPeriod
Ks = pKs
Kx = pKx
AmountOP = pAmountOP
Interval = pInterval
LoopInterval = pLoopInterval
PeriodShow = pPeriodShow
```
The main function of the above code is to declare the global functions and variables used in the current file. Then reserve the interfaces SetExchanges, SetParams, SetFunc to import these functions. Strategies on the FMZ platform call these functions and pass over some used functions and objects.
## Startup strategy on FMZ platform
The startup strategy is very simple, as follows:
There are only a few lines of code written on the FMZ platform. It should be noted that the parameters of this startup strategy are exactly the same as our packaged strategy Python version of the Dual Thrust OKCoin futures strategy code. In fact, you can directly copy Python version of the Dual Thrust OKCoin futures strategy code Strategy, then just clear the strategy code, paste it.
```
import sys
# Here I wrote the path where I put the testA file myself. I replaced it with xxx. To put it simply, I set the path of my testA file.
sys.path.append("/Users/xxx/Desktop/pythonPlayground/")
import testA
def main():
# Passing Exchange Object
testA.SetExchanges(exchanges)
# Pass global function SetFunc(pLog, pSleep, pTA, pChart, pLogStatus, pLogProfitReset, p_N, p_C, pLogProfit)
testA.SetFunc(Log, Sleep, TA, Chart, LogStatus, LogProfitReset, _N, _C, LogProfit)
# Passing strategy parameters SetParams(pContractTypeIdx, pMarginLevelIdx, pNPeriod, pKs, pKx, pAmountOP, pInterval, pLoopInterval, pPeriodShow)
testA.SetParams(ContractTypeIdx, MarginLevelIdx, NPeriod, Ks, Kx, AmountOP, Interval, LoopInterval, PeriodShow)
# Execute the main strategy function in the encapsulated testA file
testA.main()
```
In this way, we encapsulate the main body of the strategy logic in the testA file and place it locally on the device where the docker is located. On the FMZ platform, we only need to save a startup strategy. The robot that creates this startup strategy can directly load our local file and run it locally.
## Backtesting comparison
- Load testA file locally for backtest
- Original strategy, backtesting on public server
## Another simpler way
Load the file directly for execution.
This time we prepare a testB file with the code for the [Python version of the Dual Thrust OKCoin futures strategy code](https://www.fmz.com/strategy/21856) strategy.
```
import time
class Error_noSupport(BaseException):
def __init__(self):
Log("Only OKCoin futures are supported!#FF0000")
class Error_AtBeginHasPosition(BaseException):
def __init__(self):
Log("There is a futures position at startup!#FF0000")
ChartCfg = {
'__isStock': True,
'title': {
'text': 'Dual Thrust Top and bottom rail map'
},
'yAxis': {
...
```
If the strategy is too long, it is omitted and the strategy code does not need to be changed at all.
Then prepare [Python version of the Dual Thrust OKCoin futures strategy code](https://www.fmz.com/strategy/21856) (start strategy, directly execute testB file), which is our strategy on the FMZ platform, create a robot, directly load the testB file, and execute it directly. It should be noted that the startup strategy must also have exactly the same strategy parameter settings (strategy interface parameters) as the original version of [Python version of the Dual Thrust OKCoin futures strategy code](https://www.fmz.com/strategy/21856).
```
if __name__ == '__main__':
Log("run...")
try:
# The file path is processed, you can write the actual path of your testB file
f = open("/Users/xxx/Desktop/pythonPlayground/testB.py", "r")
code = f.read()
exec(code)
except Exception as e:
Log(e)
```
Perform a backtest:
The backtest result is consistent with the above test.
Obviously the second method above is simpler, it is recommended to use.
From: https://www.fmz.com/digest-topic/5869 | fmzquant |
1,881,492 | Git for Beginners: Basic Commands... | If you are starting in the world of programming or have just started your first job as a developer,... | 27,814 | 2024-06-18T01:20:22 | https://dev.to/andresordazrs/git-for-beginners-basic-commands-4b4i | git, developer, beginners | If you are starting in the world of programming or have just started your first job as a developer, you have probably already heard about Git. This powerful version control tool is essential for managing your code and collaborating with other developers. But if you still don't fully understand how it works or why it's so important, don't worry! We've all been there.
In this article, I will guide you through the basic Git commands you need to master. Imagine you have just joined a development team. You are assigned your first project and told to clone the repository, create a branch for your work, and finally, synchronize your changes with the team. It may seem overwhelming, but by the end of this article, you will have a clear understanding of these processes and be ready to use them in your daily work.
## **Cloning a Repository**
The first step to working with an existing project is to clone the repository to your local machine. To do this, follow these steps:
1. Go to the repository page on the platform you are using (GitHub, GitLab, Bitbucket, etc.).
2. Copy the repository URL (there is usually a button that says "_Clone_" or "_Clone with HTTPS_").
**Command: _git clone_**
**Example:**
```
git clone https://github.com/user/repo.git
```
**Explanation:**
This command clones the specified repository to your local machine, creating an exact copy of the project.
## **Entering the Cloned Repository**
After cloning the repository, you need to navigate to the project directory.
**Command: _cd_**
**Example:**
```
cd repo
```
**Explanation:**
Switch to the cloned repository directory to start working on it.
## **Creating and Switching Branches**
Branches allow you to work on different features or fix bugs without affecting the main code. To create a new branch and switch to it, use the following commands:
**Command: _git branch_** and **_git checkout_**
**Example:**
```
git branch new-branch
git checkout new-branch
```
**Explanation:**
`git branch new-branch` creates a new branch called "new-branch", and `git checkout new-branch` switches your working environment to that branch.
## **Adding Changes to the Index**
After making changes to your files, you need to add these changes to the index (staging area) before committing.
**Command: _git add_**
**Example:**
```
git add file.txt
```
**Explanation:**
This command adds file.txt to the index, preparing it for the commit.
## **Making a Commit**
Once you have added the changes to the index, you need to confirm these changes by creating a commit.
**Command: _git commit_**
**Example:**
```
git commit -m "Commit message"
```
**Explanation:**
This command creates a new commit with a descriptive message of the changes made.
## **Updating the Branch (Pull)**
Before pushing your changes to the remote repository, it is good practice to ensure that your local branch is updated with the changes from the remote repository.
**Command: _git pull_**
**Example:**
```
git pull origin main
```
**Explanation:**
This command brings the changes from the remote repository to your local branch, ensuring you are working with the most recent version of the code.
## **Synchronizing with the Remote Repository (Push)**
After making a commit and updating your branch, you can push your changes to the remote repository.
**Command: _git push_**
**Example:**
```
git push origin new-branch
```
**Explanation:**
This command pushes the commits from your local branch to the remote repository, updating the corresponding remote branch.
## **Checking the Repository Status**
To check the current status of your repository, including unadded changes and pending commits, use the following command:
**Command: _git status_**
**Example:**
```
git status
```
**Explanation:**
This command shows the status of the files in the working directory and the index, indicating which changes have been made and which are pending confirmation.
## **Viewing the Commit History**
You can review the commit history to see all the changes made to the project.
**Command: _git log_**
**Example:**
```
git log
```
**Explanation:**
This command shows the commit history with details such as the author, date, and commit message.
## **Undoing Changes**
If you need to undo changes in your working area, you can use the following command:
**Command: _git checkout_**
**Example:**
```
git checkout -- file.txt
```
**Explanation:**
This command restores file.txt to the last committed version, undoing uncommitted changes.
## **Removing Changes from the Index**
To remove files from the staging area, use the git reset command.
**Command: _git reset_**
**Example:**
```
git reset file.txt
```
**Explanation:**
This command removes file.txt from the index but keeps the changes in the working area.
In summary, we have covered the basic Git commands that will allow you to manage your code versions and collaborate on projects efficiently. Practicing these commands on personal projects will help you reinforce your understanding and become familiar with their use. Keep practicing and exploring Git's capabilities! | andresordazrs |
1,891,821 | Deco Hackathon focused on HTMX. Up to $5k in prizes! | Hey dev.to community! I'm here to announce the 5th hackathon by deco.cx - HTMX Edition. It's a... | 0 | 2024-06-18T01:14:19 | https://dev.to/gbrantunes/deco-hackathon-focused-on-htmx-up-to-5k-in-prizes-1g2k | webdev, development, frontend, tailwindcss | Hey dev.to community! I'm here to announce the 5th hackathon by deco.cx - HTMX Edition.
It's a virtual 3-day event starting on Friday, June 28. The goal is to transform ideas into HTMX websites with a PageSpeed score of 90+ and compete for over $5K in prizes. This is the registration site: https://deco.cx/hackathon5.
When you sign up, please put my email (gbr.antunes@gmail.com) in the "referral code" section of the form so that my referrals are counted and ranked.
| gbrantunes |
1,891,816 | 🎉服务不掉线，性能要上天！🚀——《技术宅的快乐水：高可用&高性能修炼手册》来啦！拿去，不谢，咱就是这么大方！😉 | 嘿，程序猿们、技术大佬们，是不是又被用户投诉卡成 PPT 了？🤯别慌，咱有秘密武器！这篇 《 高性能修炼手册 》... | 0 | 2024-06-18T01:01:00 | https://dev.to/sflyq/fu-wu-bu-diao-xian-xing-neng-yao-shang-tian-ji-zhu-zhai-de-kuai-le-shui-gao-ke-yong-gao-xing-neng-xiu-lian-shou-ce-lai-la-na-qu-bu-xie-zan-jiu-shi-zhe-yao-da-fang--2n17 | 嘿，程序猿们、技术大佬们，是不是又被用户投诉卡成 PPT 了？🤯别慌，咱有秘密武器！这篇 [《 高性能修炼手册 》](https://github.com/SFLAQiu/web-develop/blob/master/%E5%A6%82%E4%BD%95%E4%BF%9D%E9%9A%9C%E6%9C%8D%E5%8A%A1%E7%9A%84%E9%AB%98%E5%8F%AF%E7%94%A8-%E6%8F%90%E5%8D%87%E6%9C%8D%E5%8A%A1%E6%80%A7%E8%83%BD.md) 堪比技术界的‘蓝瓶钙’，一喝见效，让你的服务健步如飞，妈妈再也不用担心我的服务器崩了！🏃♂️
🌟序章：技术界的“武林秘籍”大公开！
在代码江湖漂，怎能不挨刀？但咱不一样，我们要做的是挥刀斩乱麻，让系统跑得比兔子还快！想象一下，当别人还在为卡顿头疼时，你的服务已经像博尔特附体，嗖嗖嗖飞速响应，那成就感，简直比打通关还爽！
🌈第一章：缓存，你的性能加速器！
想让服务健步如飞？缓存是你的第一把金钥匙！想象 Redis 是个超级赛亚人，能在毫秒间把数据从数据库里捞出来，还能七十二变，数据结构、发布订阅样样精通。但小心哦，别让缓存穿透、击穿、雪崩这些“妖魔鬼怪”找上门，做好防御，才能让 Redis 成为你的忠实护法！
🔮第二章：MQ ，解耦大师的独门绝技！
消息队列，江湖人称“解耦神器”，它就像是你程序里的乾坤大挪移，能把繁杂的功能悄悄转移到后台慢慢消化，前台依旧风度翩翩，用户点赞如潮水。记得用好 Kafka 这些大侠，让他们帮你扛住高峰，让系统如丝般顺滑。
🧙♂️第三章：异步并行，分身术 get ！
并发编程就像学了影分身，一个任务拆成几个小分身同时开干，效率翻倍不是梦！但记得，别让服务器变成人挤人的早高峰地铁，合理分配，才能让每个分身都大展拳脚。
🔮 第四章：容量评估
就像算命先生掐指一算，未来的流量高峰？小意思，咱们提前布局，让服务器准备好小板凳迎接每一位用户。
🔍 第五章：性能分析
代码里的福尔摩斯，哪里有瓶颈，哪里就有我们的放大镜，一查一个准，让性能瓶颈无所遁形。
🏋️♂️ 第六章：性能压测
没有千锤百炼，哪来的金刚不坏？咱们的接口，就是要经历九九八十一难，才能修成正果。
🚨 第七章：监控预警
24 小时在线的系统保镖，一有风吹草动，比老妈的唠叨还准时，保证你的服务稳如老狗。
🏗️ 第八章：架构演进
从单体小屋到微服务大厦，咱们的架构升级就像看科幻电影，每一次迭代都让人目瞪口呆。
最后，别忘了，这一切的努力不仅仅是为了让系统跑得快，更是为了让咱们的生活少点加班，多点快乐时光。技术的世界，虽然充满了挑战，但也正是这些挑战，让我们在枯燥的代码世界里找到了属于自己的小确幸。
希望这段旅程能给你带来一丝启发，或者至少是一个会心的微笑。记住，技术之路，咱不孤单，因为有你，有我，还有那无穷无尽的 bug 和彩蛋等着咱们去挖掘。继续加油，程序猿们，咱们江湖再见！💻 | sflyq | |
1,891,815 | SQLynx- The Best SQL Editor Tool on the market | I recommend trying out SQLynx, a powerful and versatile SQL IDE/SQL editor. The SQLynx product series... | 0 | 2024-06-18T00:57:44 | https://dev.to/concerate/sqlynx-the-best-sql-editor-tool-on-the-market-29i4 | I recommend trying out SQLynx, a powerful and versatile SQL IDE/SQL editor.
The SQLynx product series is designed to meet the needs of users of various scales and requirements, from individual developers and small teams to large enterprises. SQLynx offers suitable solutions to help users manage and utilize databases efficiently and securely. Choose SQLynx to experience the powerful features and outstanding performance of a modern SQL editor.
SQLynx Pro
Features:
• Intelligent Code Completion and Suggestions: Utilizes AI technology to provide advanced code completion, intelligent suggestions, and automatic error detection, significantly enhancing the efficiency of writing and debugging SQL queries.
• Cross-Platform and Mobile Access: Supports access across multiple platforms, including Windows, macOS, and Linux, ensuring users can efficiently manage databases regardless of their location.
• Robust Security Measures: Offers enhanced encryption, multi-factor authentication, and strict access control to protect sensitive data from unauthorized access and network threats.
Download ：https://www.sqlynx.com/en/#/home/probation/SQLynx
| concerate | |
1,891,814 | Ultimate JavaScript Cheatsheet for Developers | Introduction JavaScript is a versatile and powerful programming language used extensively... | 0 | 2024-06-18T00:55:37 | https://raajaryan.tech/ultimate-javascript-cheatsheet-for-developers | javascript, beginners, tutorial, programming | ### Introduction
JavaScript is a versatile and powerful programming language used extensively in web development. It allows developers to create dynamic and interactive user interfaces. This cheatsheet is designed to provide a quick reference guide for common JavaScript concepts, functions, and syntax.
### Console Methods
#### Printing to the Console
```javascript
// => Hello world!
console.log('Hello world!');
// => Hello RaajAryan
console.warn('hello %s', 'RaajAryan');
// Prints error message to stderr
console.error(new Error('Oops!'));
```
### Numbers and Variables
#### Declaring Variables
```javascript
let amount = 6;
let price = 4.99;
let x = null;
let name = "Tammy";
const found = false;
// => Tammy, false, null
console.log(name, found, x);
var a;
console.log(a); // => undefined
```
### Strings
#### Declaring Strings
```javascript
let single = 'Wheres my bandit hat?';
let double = "Wheres my bandit hat?";
// => 21
console.log(single.length);
```
### Arithmetic Operators
```javascript
5 + 5 = 10 // Addition
10 - 5 = 5 // Subtraction
5 * 10 = 50 // Multiplication
10 / 5 = 2 // Division
10 % 5 = 0 // Modulo
```
### Comments
```javascript
// This line will denote a comment
/*
The below configuration must be
changed before deployment.
*/
```
### Assignment Operators
```javascript
let number = 100;
// Both statements will add 10
number = number + 10;
number += 10;
console.log(number);
// => 120
```
### String Interpolation
```javascript
let age = 7;
// String concatenation
'Tommy is ' + age + ' years old.';
// String interpolation
`Tommy is ${age} years old.`;
```
### let Keyword
```javascript
let count;
console.log(count); // => undefined
count = 10;
console.log(count); // => 10
```
### const Keyword
```javascript
const numberOfColumns = 4;
// TypeError: Assignment to constant...
numberOfColumns = 8;
```
### JavaScript Conditionals
#### if Statement
```javascript
const isMailSent = true;
if (isMailSent) {
console.log('Mail sent to recipient');
}
```
#### Ternary Operator
```javascript
var x = 1;
// => true
result = (x == 1) ? true : false;
```
#### Logical Operators
```javascript
true || false; // true
10 > 5 || 10 > 20; // true
false || false; // false
10 > 100 || 10 > 20; // false
true && true; // true
1 > 2 && 2 > 1; // false
true && false; // false
4 === 4 && 3 > 1; // true
1 > 3 // false
3 > 1 // true
250 >= 250 // true
1 === 1 // true
1 === 2 // false
1 === '1' // false
let lateToWork = true;
let oppositeValue = !lateToWork;
// => false
console.log(oppositeValue);
```
#### Nullish Coalescing Operator (??)
```javascript
null ?? 'I win'; // 'I win'
undefined ?? 'Me too'; // 'Me too'
false ?? 'I lose'; // false
0 ?? 'I lose again'; // 0
'' ?? 'Damn it'; // ''
```
#### else if Statement
```javascript
const size = 10;
if (size > 100) {
console.log('Big');
} else if (size > 20) {
console.log('Medium');
} else if (size > 4) {
console.log('Small');
} else {
console.log('Tiny');
}
// Print: Small
```
#### switch Statement
```javascript
const food = 'salad';
switch (food) {
case 'oyster':
console.log('The taste of the sea');
break;
case 'pizza':
console.log('A delicious pie');
break;
default:
console.log('Enjoy your meal');
}
```
#### == vs ===
```javascript
0 == false; // true
0 === false; // false, different type
1 == "1"; // true, automatic type conversion
1 === "1"; // false, different type
null == undefined; // true
null === undefined; // false
'0' == false; // true
'0' === false; // false
```
### JavaScript Functions
#### Defining and Calling Functions
```javascript
// Defining the function:
function sum(num1, num2) {
return num1 + num2;
}
// Calling the function:
sum(3, 6); // 9
```
#### Anonymous Functions
```javascript
// Named function
function rocketToMars() {
return 'BOOM!';
}
// Anonymous function
const rocketToMars = function() {
return 'BOOM!';
}
```
#### Arrow Functions (ES6)
```javascript
// With two arguments
const sum = (param1, param2) => {
return param1 + param2;
};
console.log(sum(2, 5)); // => 7
// With no arguments
const printHello = () => {
console.log('hello');
};
printHello(); // => hello
// With a single argument
const checkWeight = weight => {
console.log(`Weight: ${weight}`);
};
checkWeight(25); // => Weight: 25
// Concise arrow functions
const multiply = (a, b) => a * b;
console.log(multiply(2, 30)); // => 60
```
### JavaScript Scope
#### Scope
```javascript
function myFunction() {
let pizzaName = "Margarita";
// Code here can use pizzaName
}
// Code here can't use pizzaName
```
#### Block Scoped Variables
```javascript
const isLoggedIn = true;
if (isLoggedIn) {
const statusMessage = 'Logged in.';
}
// Uncaught ReferenceError...
console.log(statusMessage);
```
#### Global Variables
```javascript
// Variable declared globally
const color = 'blue';
function printColor() {
console.log(color);
}
printColor(); // => blue
```
#### let vs var
```javascript
for (let i = 0; i < 3; i++) {
// This is the Max Scope for 'let'
// i accessible ✔️
}
// i not accessible ❌
for (var i = 0; i < 3; i++) {
// i accessible ✔️
}
// i accessible ✔️
```
#### Loops with Closures
```javascript
// Prints 3 thrice, not what we meant.
for (var i = 0; i < 3; i++) {
setTimeout(_ => console.log(i), 10);
}
// Prints 0, 1 and 2, as expected.
for (let j = 0; j < 3; j++) {
setTimeout(_ => console.log(j), 10);
}
```
### JavaScript Arrays
#### Arrays
```javascript
const fruits = ["apple", "orange", "banana"];
// Different data types
const data = [1, 'chicken', false];
```
#### Property .length
```javascript
const numbers = [1, 2, 3, 4];
console.log(numbers.length); // 4
```
#### Index
```javascript
// Accessing an array element
const myArray = [100, 200, 300];
console.log(myArray[0]); // 100
console.log(myArray[1]); // 200
```
#### Mutable Chart
| Add | Remove | Start | End |
|----------|----------|-------|------|
| push | ✔️ | ✔️ | |
| pop | ✔️ | | ✔️ |
| unshift | ✔️ | ✔️ | |
| shift | ✔️ | ✔️ | |
#### Method .push()
```javascript
// Adding a single element:
const cart = ['apple', 'orange'];
cart.push('pear');
// Adding multiple elements:
const numbers = [1, 2];
numbers.push(3, 4, 5);
```
#### Method .pop()
```javascript
const fruits = ["apple", "orange", "banana"];
const fruit = fruits.pop(); // 'banana'
console.log(fruits); // ["apple", "orange"]
```
#### Method .shift()
```javascript
let cats = ['Bob', 'Willy', 'Mini'];
cats.shift(); // ['Willy', 'Mini']
```
#### Method .unshift()
```javascript
let cats = ['Bob'];
cats.unshift('Willy'); // => ['Willy', 'Bob']
cats.unshift('Puff', 'George'); // => ['Puff', 'George', 'Willy', 'Bob']
```
#### Method .concat()
```javascript
const numbers = [3, 2, 1];
const newFirstNumber = 4;
// => [4, 3, 2, 1]
[new
FirstNumber].concat(numbers);
// => [3, 2, 1, 4]
numbers.concat(newFirstNumber);
```
### JavaScript Loops
#### While Loop
```javascript
while (condition) {
// code block to be executed
}
let i = 0;
while (i < 5) {
console.log(i);
i++;
}
```
#### Reverse Loop
```javascript
const fruits = ["apple", "orange", "banana"];
for (let i = fruits.length - 1; i >= 0; i--) {
console.log(`${i}. ${fruits[i]}`);
}
// => 2. banana
// => 1. orange
// => 0. apple
```
#### Do…While Statement
```javascript
let x = 0;
let i = 0;
do {
x = x + i;
console.log(x);
i++;
} while (i < 5);
// => 0 1 3 6 10
```
#### For Loop
```javascript
for (let i = 0; i < 4; i += 1) {
console.log(i);
};
// => 0, 1, 2, 3
```
#### Looping Through Arrays
```javascript
for (let i = 0; i < array.length; i++){
console.log(array[i]);
}
// => Every item in the array
```
#### Break
```javascript
for (let i = 0; i < 99; i += 1) {
if (i > 5) {
break;
}
console.log(i)
}
// => 0 1 2 3 4 5
```
#### Continue
```javascript
for (i = 0; i < 10; i++) {
if (i === 3) { continue; }
text += "The number is " + i + "<br>";
}
```
#### Nested Loops
```javascript
for (let i = 0; i < 2; i += 1) {
for (let j = 0; j < 3; j += 1) {
console.log(`${i}-${j}`);
}
}
```
#### for...in loop
```javascript
const fruits = ["apple", "orange", "banana"];
for (let index in fruits) {
console.log(index);
}
// => 0
// => 1
// => 2
```
#### for...of loop
```javascript
const fruits = ["apple", "orange", "banana"];
for (let fruit of fruits) {
console.log(fruit);
}
// => apple
// => orange
// => banana
```
### JavaScript Iterators
#### Functions Assigned to Variables
```javascript
let plusFive = (number) => {
return number + 5;
};
// f is assigned the value of plusFive
let f = plusFive;
plusFive(3); // 8
// Since f has a function value, it can be invoked.
f(9); // 14
```
#### Callback Functions
```javascript
const isEven = (n) => {
return n % 2 == 0;
}
let printMsg = (evenFunc, num) => {
const isNumEven = evenFunc(num);
console.log(`${num} is an even number: ${isNumEven}.`)
}
// Pass in isEven as the callback function
printMsg(isEven, 4);
// => The number 4 is an even number: True.
```
#### Array Method .reduce()
```javascript
const numbers = [1, 2, 3, 4];
const sum = numbers.reduce((accumulator, curVal) => {
return accumulator + curVal;
});
console.log(sum); // 10
```
#### Array Method .map()
```javascript
const members = ["Taylor", "Donald", "Don", "Natasha", "Bobby"];
const announcements = members.map((member) => {
return member + " joined the contest.";
});
console.log(announcements);
```
#### Array Method .forEach()
```javascript
const numbers = [28, 77, 45, 99, 27];
numbers.forEach(number => {
console.log(number);
});
```
#### Array Method .filter()
```javascript
const randomNumbers = [4, 11, 42, 14, 39];
const filteredArray = randomNumbers.filter(n => {
return n > 5;
});
```
### JavaScript Objects
#### Accessing Properties
```javascript
const apple = {
color: 'Green',
price: { bulk: '$3/kg', smallQty: '$4/kg' }
};
console.log(apple.color); // => Green
console.log(apple.price.bulk); // => $3/kg
```
#### Naming Properties
```javascript
// Example of invalid key names
const trainSchedule = {
// Invalid because of the space between words.
platform num: 10,
// Expressions cannot be keys.
40 - 10 + 2: 30,
// A + sign is invalid unless it is enclosed in quotations.
+compartment: 'C'
}
```
#### Non-existent Properties
```javascript
const classElection = {
date: 'January 12'
};
console.log(classElection.place); // undefined
```
#### Mutable
```javascript
const student = {
name: 'Sheldon',
score: 100,
grade: 'A',
}
console.log(student)
// { name: 'Sheldon', score: 100, grade: 'A' }
delete student.score
student.grade = 'F'
console.log(student)
// { name: 'Sheldon', grade: 'F' }
student = {}
// TypeError: Assignment to constant variable.
```
#### Assignment Shorthand Syntax
```javascript
const person = {
name: 'Tom',
age: '22',
};
const {name, age} = person;
console.log(name); // 'Tom'
console.log(age); // '22'
```
#### Delete Operator
```javascript
const person = {
firstName: "Matilda",
age: 27,
hobby: "knitting",
goal: "learning JavaScript"
};
delete person.hobby; // or delete person[hobby];
console.log(person);
/*
{
firstName: "Matilda"
age: 27
goal: "learning JavaScript"
}
*/
```
#### Objects as Arguments
```javascript
const origNum = 8;
const origObj = { color: 'blue' };
const changeItUp = (num, obj) => {
num = 7;
obj.color = 'red';
};
changeItUp(origNum, origObj);
// Will output 8 since integers are passed by value.
console.log(origNum);
// Will output 'red' since objects are passed
// by reference and are therefore mutable.
console.log(origObj.color);
```
#### Shorthand Object Creation
```javascript
const activity = 'Surfing';
const beach = { activity };
console.log(beach); // { activity: 'Surfing' }
```
#### this Keyword
```javascript
const cat = {
name: 'Pipey',
age: 8,
whatName() {
return this.name;
}
};
console.log(cat.whatName()); // => Pipey
```
#### Factory Functions
```javascript
// A factory function that accepts 'name',
// 'age', and 'breed' parameters to return
// a customized dog object.
const dogFactory = (name, age, breed) => {
return {
name: name,
age: age,
breed: breed,
bark() {
console.log('Woof!');
}
};
};
```
#### Methods
```javascript
const engine = {
// method shorthand, with one argument
start(adverb) {
console.log(`The engine starts up ${adverb}...`);
},
// anonymous arrow function expression with no arguments
sputter: () => {
console.log('The engine sputters...');
},
};
engine.start('noisily');
engine.sputter();
```
#### Getters and Setters
```javascript
const myCat = {
_name: 'Dottie',
get name() {
return this._name;
},
set name(newName) {
this._name = newName;
}
};
// Reference invokes the getter
console.log(myCat.name);
// Assignment invokes the setter
myCat.name = 'Yankee';
```
### JavaScript Classes
#### Static Methods
```javascript
class Dog {
constructor(name) {
this._name = name;
}
introduce() {
console.log('This is ' + this._name + ' !');
}
// A static method
static bark() {
console.log('Woof!');
}
}
const myDog = new Dog('Buster');
myDog.introduce();
// Calling the static method
Dog.bark();
```
#### Class
```javascript
class Song {
constructor() {
this.title;
this.author;
}
play() {
console.log('Song playing!');
}
}
const mySong = new Song();
mySong.play();
```
#### Class Constructor
```javascript
class Song {
constructor(title, artist) {
this.title = title;
this.artist = artist;
}
}
const mySong = new Song('Bohemian Rhapsody', 'Queen');
console.log(mySong.title);
```
#### Class Methods
```javascript
class Song {
play() {
console.log('Playing!');
}
stop() {
console.log('Stopping!');
}
}
```
#### extends
```javascript
// Parent class
class Media {
constructor(info) {
this.publishDate = info.publishDate;
this.name = info.name;
}
}
// Child class
class Song extends Media {
constructor(songData) {
super(songData);
this.artist = songData.artist;
}
}
const mySong = new Song({
artist: 'Queen',
name: 'Bohemian Rhapsody',
publishDate: 1975
});
```
### JavaScript Modules
#### Export
```javascript
// myMath.js
// Default export
export default function add(x, y) {
return x + y;
}
// Normal export
export function subtract(x, y) {
return x - y;
}
// Multiple exports
function multiply(x, y) {
return x * y;
}
function duplicate(x) {
return x * 2;
}
export {
multiply,
duplicate
}
```
#### Import
```javascript
// main.js
import add, { subtract, multiply, duplicate } from './myMath.js';
console.log(add(6, 2)); // 8
console.log(subtract(6, 2)); // 4
console.log(multiply(6, 2)); // 12
console.log(duplicate(5)); // 10
// index.html
<script type="module" src="main.js"></script>
```
#### Export Module
```javascript
// myMath.js
function add(x, y) {
return x + y;
}
function subtract(x, y) {
return x - y;
}
function multiply(x, y) {
return x * y;
}
function duplicate(x) {
return x * 2;
}
// Multiple exports in node.js
module.exports = {
add,
subtract,
multiply,
duplicate
}
```
#### Require Module
```javascript
// main.js
const myMath = require('./myMath.js');
console.log(myMath.add(6, 2)); // 8
console.log(myMath.subtract(6, 2)); // 4
console.log(myMath.multiply(6, 2)); // 12
console.log(myMath.duplicate(5)); // 10
```
### JavaScript Promises
#### Promise States
```javascript
const promise = new Promise((resolve, reject) => {
const res = true;
// An asynchronous operation.
if (res) {
resolve('Resolved!');
} else {
reject(Error('Error'));
}
});
promise.then((res) => console.log(res), (err) => console.error(err));
```
#### Executor Function
```javascript
const executorFn = (resolve, reject) => {
resolve('Resolved!');
};
const promise = new Promise(executorFn);
```
#### setTimeout()
```javascript
const loginAlert = () => {
console.log('Login');
};
setTimeout(loginAlert, 6000);
```
#### .then() Method
```javascript
const promise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('Result');
}, 200);
});
promise.then((res) => {
console.log(res);
}, (err) => {
console.error(err);
});
```
#### .catch() Method
```javascript
const promise = new Promise((resolve, reject) => {
setTimeout(() => {
reject(Error('Promise Rejected Unconditionally.'));
}, 1000);
});
promise.then((res) => {
console.log(value);
});
promise.catch((err) => {
console.error(err);
});
```
#### Promise.all()
```javascript
const promise1 = new Promise((resolve, reject) => {
setTimeout(() => {
resolve(3);
}, 300);
});
const promise2 = new Promise((resolve, reject) => {
setTimeout(() => {
resolve(2);
}, 200);
});
Promise.all([promise1, promise2]).then((res) => {
console.log(res[0]);
console.log(res[1]);
});
```
#### Avoiding Nested Promise and .then()
```javascript
const promise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('*');
}, 1000);
});
const twoStars = (star) => {
return (star + star);
};
const oneDot = (star) => {
return (star + '.');
};
const print = (val) => {
console.log(val);
};
// Chaining them all together
promise.then(twoStars).then(oneDot).then(print);
```
#### Creating
```javascript
const executorFn = (resolve, reject) => {
console.log('The executor function of the promise!');
};
const promise = new Promise(executorFn);
```
#### Chaining Multiple .then()
```javascript
const promise = new Promise(resolve => setTimeout(() => resolve('Alan'), 100));
promise.then(res => {
return res === 'Alan' ? Promise.resolve('Hey Alan!') : Promise.reject('Who are you?');
}).then((res) => {
console.log(res);
}, (err) => {
console.error(err);
});
```
#### Fake HTTP Request with Promise
```javascript
const mock = (success, timeout = 1000) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
if (success) {
resolve({status: 200, data:{}});
} else {
reject({message: 'Error'});
}
}, timeout);
});
};
const someEvent = async () => {
try {
await mock(true, 1000);
} catch (e) {
console.log(e.message);
}
};
```
### JavaScript Async-Await
#### Asynchronous
```javascript
function helloWorld() {
return new Promise(resolve => {
setTimeout(() => {
resolve('Hello World!');
}, 2000);
});
}
const msg = async function() { //Async Function Expression
const msg = await helloWorld();
console.log('Message:', msg);
};
const msg1 = async () => { //Async Arrow Function
const msg = await helloWorld();
console.log('Message:', msg);
};
msg(); // Message: Hello World! <-- after 2 seconds
msg1(); // Message: Hello World! <-- after 2 seconds
```
#### Resolving Promises
```javascript
let pro1 = Promise.resolve(5);
let pro2 = 44;
let pro3 = new Promise(function(resolve, reject) {
setTimeout(resolve, 100, 'foo');
});
Promise.all([pro1, pro2, pro3]).then(function(values) {
console.log(values);
});
// expected => Array [5, 44, "foo"]
```
#### Async Await Promises
```javascript
function helloWorld() {
return new Promise(resolve => {
setTimeout(() => {
resolve('Hello World!');
}, 2000);
});
}
async function msg() {
const msg = await helloWorld();
console.log('Message:', msg);
}
msg(); // Message: Hello World! <-- after 2 seconds
```
#### Error Handling
```javascript
let json = '{ "age": 30 }'; // incomplete data
try {
let user = JSON.parse(json); // <-- no errors
console.log(user.name); // no name!
} catch (e) {
console.error("Invalid JSON data!");
}
```
#### Async Await Operator
```javascript
function helloWorld() {
return new Promise(resolve => {
setTimeout(() => {
resolve('Hello World!');
}, 2000);
});
}
async function msg() {
const msg = await helloWorld();
console.log('Message:', msg);
}
msg(); // Message: Hello World! <-- after 2 seconds
```
### JavaScript Requests
#### JSON
```javascript
const jsonObj = {
"name": "Rick",
"id": "11A",
"level": 4
};
```
#### XMLHttpRequest
```javascript
const xhr = new XMLHttpRequest();
xhr.open('GET', 'mysite.com/getjson');
```
#### GET
```javascript
const req = new XMLHttpRequest();
req.responseType = 'json';
req.open('GET', '/getdata?id=65');
req.onload = () => {
console.log(xhr.response);
};
req.send();
```
#### POST
```javascript
const data = {
fish: 'Salmon',
weight: '1.5 KG',
units: 5
};
const xhr = new XMLHttpRequest();
xhr.open('POST', '/inventory/add');
xhr.responseType = 'json';
xhr.send(JSON.stringify(data));
xhr.onload = () => {
console.log(xhr.response);
};
```
#### fetch API
```javascript
fetch(url, {
method: 'POST',
headers: {
'Content-type': 'application/json',
'apikey': apiKey
},
body: data
}).then(response => {
if (response.ok) {
return response.json();
}
throw new Error('Request failed!');
}, networkError => {
console.log(networkError.message);
});
```
#### JSON Formatted
```javascript
fetch('url-that-returns-JSON')
.then(response => response.json())
.then(jsonResponse => {
console.log(jsonResponse);
});
```
#### Promise URL Parameter Fetch API
```javascript
fetch('url')
.then(
response => {
console.log(response);
},
rejection => {
console.error(rejection.message);
}
);
```
#### Fetch API Function
```javascript
fetch('https://api-xxx.com/endpoint', {
method: 'POST',
body: JSON.stringify({ id: "200" })
}).then(response => {
if (response.ok) {
return response.json();
}
throw new Error('Request failed!');
}, networkError => {
console.log(networkError.message);
}).then(jsonResponse => {
console.log(jsonResponse);
});
```
#### async await Syntax
```javascript
const getSuggestions = async () => {
const wordQuery = inputField.value;
const endpoint = `${url}${queryParams}${wordQuery}`;
try {
const response = await fetch(endpoint, {cache: 'no-cache'});
if (response.ok) {
const jsonResponse = await response.json();
// Handle jsonResponse
}
} catch (error) {
console.log(error);
}
};
```
### Conclusion
This JavaScript cheatsheet covers a wide range of topics and provides examples to help you quickly reference and understand common JavaScript concepts. Whether you're a beginner or an experienced developer, having a handy cheatsheet can make your coding more efficient and productive. Keep this guide close by to refresh your knowledge and enhance your JavaScript skills. | raajaryan |
1,891,813 | Super cool portfolio site! | Try it out and let me know what you think! Live: Josh Garvey Website A portfolio website coded... | 0 | 2024-06-18T00:51:08 | https://dev.to/jgar514/super-cool-portfolio-site-569a | webdev, javascript, beginners, react | Try it out and let me know what you think!
Live: [Josh Garvey Website](https://joshuagarvey.com/)
A portfolio website coded with React, Three.js, React Three Fiber, and deployed to Netlify.
[github repo](https://github.com/Jgar514/JoshandEllie/blob/modbranch/README.md)
(current code is under modbranch)
Created by: Josh Garvey - @Jgar514
| jgar514 |
1,891,812 | Configuring Access to Prometheus and Grafana via Sub-paths | 1. Introduction Grafana and Prometheus stand as integral tools for monitoring... | 0 | 2024-06-18T00:41:30 | https://dev.to/tinhtq97/configuring-access-to-prometheus-and-grafana-via-sub-paths-55n7 | ## 1. Introduction
Grafana and Prometheus stand as integral tools for monitoring infrastructures across various industry sectors. This document aims to illustrate the process of redirecting Grafana and Prometheus to operate under the same domain while utilizing distinct paths.
## 2. How does the story begin?
As a seasoned DevOps engineer, my commitment lies in sharing knowledge with a broader audience. My pursuit involves identifying tools conducive to enhancing the monitoring capabilities of both general users and fellow DevOps Engineers.
## 3. Prerequisites
Functioning Kubernetes Cluster
Proficiency in Kubernetes Management
Helm Installation
Optional: K9s for Kubernetes Cluster Observation ([GitHub link](https://github.com/derailed/k9s))
## 4. Goals & Objectives
After researching, I found a lack of available information on this topic despite numerous related questions online. Hence, I’m writing a guide to fill this gap.
## 5. Step-by-Step Guide
### Step 1: Installing [Kube-prometheus-stack](https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack)
Create a values.yml file to configure the Helm chart values for both Prometheus and Grafana.
```yaml
grafana:
env:
GF_SERVER_SERVE_FROM_SUB_PATH: true
grafana.ini:
server:
domain: "<domain>"
root_url: "<protocol>:<domain>/<path>/"
prometheus:
prometheusSpec:
externalUrl: "<protocol>:<domain>/<path>/"
routePrefix: /path`
```
For instance
```yaml
grafana:
env:
GF_SERVER_SERVE_FROM_SUB_PATH: true
grafana.ini:
server:
domain: "example.com"
root_url: "https://example.com/grafana/"
prometheus:
prometheusSpec:
externalUrl: "https://example.com/prometheus/"
routePrefix: /prometheus
```
```bash
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update
helm install <relase-name> prometheus-community/kube-prometheus-stack -n <namespace> -f values.yml
```
### Step 2. Create Ingress for mapping domain
There are two methods to accomplish this task:
Define in the values.yml file for automatic creation.
Another approach involves manually creating a YAML file for the ingress. I opted for this method because it allows centralized management, facilitating easy problem identification if any issues arise.
Create ingress.yml file
```yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: prometheus
namespace: monitoring
annotations:
kubernetes.io/ingressClassName: "traefik"
spec:
rules:
- host: ""
http:
paths:
- path: /prometheus
pathType: Prefix
backend:
service:
name: <helm-release-name>-kube-prometheus-prometheus
port:
number: 9090
- path: /grafana
pathType: Prefix
backend:
service:
name: <helm-release-name>-grafana
port:
number: 80
```
Execute the following command to apply the changes:
```bash
kubectl apply -f ingress.yml
```
The result is shown below
## 6. Conclusion
As I venture into writing for Medium, I acknowledge potential errors in this documentation. I invite feedback and further inquiries from readers to improve the accuracy and comprehensiveness of this guide. Thank you for your attention and engagement. | tinhtq97 | |
1,891,811 | Exploring the Fundamentals of Data Visualization with ggplot2 | Introduction Data visualization plays a crucial role in data analysis as it allows us to... | 0 | 2024-06-18T00:33:08 | https://dev.to/kartikmehta8/exploring-the-fundamentals-of-data-visualization-with-ggplot2-2f0h | javascript, beginners, programming, tutorial | ## Introduction
Data visualization plays a crucial role in data analysis as it allows us to make sense of complex data by presenting it in a visual format. One of the most popular tools for creating data visualizations is ggplot2 in R. This powerful and flexible package offers a wide range of features that make it a go-to choice for data visualization. In this article, we will explore the fundamentals of ggplot2 and understand its advantages, disadvantages, and key features.
## Advantages of ggplot2
One of the biggest advantages of ggplot2 is its grammar of graphics approach. This means that the package follows a set of rules for creating visualizations, making it easier to customize and modify plots. Additionally, ggplot2 also offers a wide range of customizable themes, scales, and statistical transformations, allowing users to create highly tailored and professional-looking visualizations.
## Disadvantages of ggplot2
Despite its numerous advantages, ggplot2 does have some limitations. One of the main drawbacks is its steep learning curve, especially for beginners. The syntax and structure of the package can be confusing and overwhelming, requiring a significant amount of time and effort to master. Additionally, ggplot2 may not be the best choice for creating interactive visualizations, as it is mainly designed for static plots.
## Key Features of ggplot2
Some of the key features of ggplot2 include its ability to create complex visualizations with minimal code, thanks to its layered approach. It also has a wide range of statistical tools, making it a popular choice among data analysts and researchers. The package also has a vibrant and active community, which constantly contributes new and innovative ideas for data visualizations.
### Example of a Basic ggplot2 Visualization
```r
library(ggplot2)
# Creating a simple scatter plot
ggplot(data = mtcars, aes(x = wt, y = mpg)) +
geom_point() +
ggtitle("Fuel Efficiency vs. Car Weight") +
xlab("Weight (1000 lbs)") +
ylab("Miles Per Gallon")
```
This example demonstrates how to create a simple scatter plot using ggplot2, illustrating the relationship between car weight and fuel efficiency. The code is straightforward, showcasing how ggplot2 uses a layered approach to build up plots.
## Conclusion
In conclusion, ggplot2 is a powerful and versatile tool for data visualization, offering numerous advantages such as a grammar of graphics approach and a wide range of customizable features. However, it also has some disadvantages, such as a steep learning curve. Overall, ggplot2 remains a top choice for creating informative and aesthetically pleasing visualizations in the world of data science. | kartikmehta8 |
1,891,759 | Importance of WebP Images | What Are WebP Images? WebP is a modern image format developed by Google that provides... | 0 | 2024-06-17T23:19:47 | https://dev.to/msmith99994/importance-of-webp-images-11nd | ## What Are WebP Images?
WebP is a modern image format developed by Google that provides superior compression for images on the web. It supports both lossy and lossless compression, offering high-quality visuals with smaller file sizes compared to older formats like JPEG and PNG. Introduced in 2010, WebP has quickly gained popularity for its efficiency and performance benefits in web development.
## Characteristics of WebP Images
**- Lossy and Lossless Compression:** WebP supports both types of compression, making it versatile for various image quality and size requirements.
**- Transparency:** Similar to PNG, WebP supports transparency (alpha channel) in lossless and lossy images.
**- Animation:** WebP supports animation, providing an alternative to GIF with better compression.
**- Metadata:** WebP can store metadata like EXIF and XMP, which is useful for photographers and digital artists.
## Where Are WebP Images Used?
WebP images are widely used in web development and digital applications:
**- Websites and Blogs:** Due to their smaller size and high quality, WebP images improve website loading times and performance, enhancing user experience.
**- E-commerce:** Online stores use WebP to display high-quality product images without compromising page load speed.
- Digital Advertising: WebP's efficient compression reduces the load time of banner ads and other graphics, making ad delivery faster.
**- Mobile Applications:** WebP images help mobile apps run more efficiently by reducing the amount of data that needs to be downloaded and displayed.
## Advantages and Disadvantages of WebP Images
### Advantages
**- Smaller File Sizes:** WebP images are significantly smaller than JPEG and PNG files, reducing bandwidth usage and improving page load times.
- High Quality: Despite their smaller size, WebP images maintain high visual quality, comparable to traditional formats.
**- Transparency and Animation:** WebP supports transparency and animations, making it a versatile format for various types of images.
**- Wide Browser Support:** Most modern browsers, including Chrome, Firefox, Edge, and Opera, support WebP, making it a reliable choice for web developers.
### Disadvantages
- **Compatibility Issues:** While support for WebP is growing, some older browsers and software do not support the format, which can be a drawback.
- **Conversion Overhead:** Converting existing image libraries to WebP can require additional effort and processing power.
- **Complexity:** Handling multiple image formats (for compatibility) can complicate the development workflow.
## How to Convert WebP to PNG
Converting [WebP to PNG](https://cloudinary.com/tools/webp-to-png) is straightforward and can be done using various tools and methods:
**1. Using Online Tools:**
Websites like Convertio and Online-Convert allow you to upload WebP files and download the converted PNG files.
**2. Using Image Editing Software:**
Software like Adobe Photoshop and GIMP support WebP format. You can open your WebP file and save it as PNG.
**3. Command Line Tools:**
Command-line tools like dwebp from the WebP library can be used for conversion.
**4. Programming Libraries**
Programming libraries such as Python's Pillow or JavaScript's sharp can be used to automate the conversion process in applications.
## Conclusion
WebP images represent a significant advancement in web image formats, offering superior compression, high quality, and support for transparency and animation. They are widely used across websites, e-commerce platforms, digital advertising, and mobile applications to enhance performance and user experience. While there are some compatibility challenges and conversion efforts required, the benefits of WebP make it a valuable format for modern digital applications. Understanding how to convert between WebP and other formats, such as PNG, ensures flexibility and compatibility in various contexts. | msmith99994 | |
1,891,803 | A Trigger Analogy | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-18T00:05:43 | https://dev.to/thedigitalbricklayer/a-trigger-analogy-1gkc | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
We can think of triggers in the context of a rabbit trap. When an update, delete, or insert is made, it is like the prey triggering the trap, and we can do something about it, like inserting, updating, or deleting a record in the database.
## Additional Context
https://www.geeksforgeeks.org/sql-trigger-student-database/
| thedigitalbricklayer |
1,892,798 | Learn .NET Aspire by example: Polyglot persistence featuring PostgreSQL, Redis, MongoDB, and Elasticsearch | TL;DR Learn how to set up various databases using Aspire by building a simple social media... | 0 | 2024-06-28T10:51:29 | https://nikiforovall.github.io/dotnet/aspire/2024/06/18/polyglot-persistance-with-aspire.html | dotnet, csharp, aspnetcore, aspire | ---
title: Learn .NET Aspire by example: Polyglot persistence featuring PostgreSQL, Redis, MongoDB, and Elasticsearch
published: true
date: 2024-06-18 00:00:00 UTC
tags: dotnet, csharp, aspnetcore, aspire
canonical_url: https://nikiforovall.github.io/dotnet/aspire/2024/06/18/polyglot-persistance-with-aspire.html
---
## TL;DR
Learn how to set up various databases using Aspire by building a simple social media application.
**Source code** : [https://github.com/NikiforovAll/social-media-app-aspire](https://github.com/NikiforovAll/social-media-app-aspire)
_Table of Contents:_
- [TL;DR](#tldr)
- [Introduction](#introduction)
- [Case Study - Social Media App](#case-study---social-media-app)
- [Application Design. Add PostgreSQL](#application-design-add-postgresql)
- [Code](#code)
- [Application Design. Add Redis](#application-design-add-redis)
- [Code](#code-1)
- [Application Design. Add MongoDb](#application-design-add-mongodb)
- [Code](#code-2)
- [Application Design. Add Elasticsearch](#application-design-add-elasticsearch)
- [Code](#code-3)
- [Search](#search)
- [Analytics](#analytics)
- [Putting everything together. Migration](#putting-everything-together-migration)
- [Migration](#migration)
- [Conclusion](#conclusion)
- [References](#references)
## Introduction
Polyglot persistence refers to the practice of using multiple databases or data storage technologies within a single application. Instead of relying on just one database for everything, you can choose the most suitable database for each specific need or type of data. It’s like having a toolbox with different tools for different tasks, so you can use the right tool for each job.
The importance of polyglot persistence lies in the fact that different databases excel in different areas. For example, relational databases like PostgreSQL are great for structured data and complex queries, while NoSQL databases like MongoDB are better suited for handling unstructured or semi-structured data. Similarly, Elasticsearch is optimized for full-text search, and Redis excels in caching and high-performance scenarios.
By leveraging the strengths of different databases, developers can design more efficient and scalable systems. They can choose the right tool for the job, ensuring that each component of the application is using the most suitable database technology.
The selection of the correct database depends on various factors such as the nature of the data, the expected workload, performance requirements, scalability needs, and the complexity of the queries. By carefully considering these factors, developers can ensure that the chosen databases align with the specific requirements of the application.
### Case Study - Social Media App
In this post we will design social media application. It typically includes something like: Users, Posts, Follows, Likes, etc.
Overall, these components provide essential functionality for a social media app. The search functionality allows users to find other users and relevant posts, while the analytics component provides insights into user activity and engagement.
## Application Design. Add PostgreSQL
In this section, we will discuss how to implement the users and follows functionality.
Relational data, such as user information and their relationships (follows), can be easily represented and managed in a relational database like PostgreSQL.
One of the main benefits of using a relational database is the ability to efficiently retrieve and manipulate data. They are well-suited for scenarios where data needs to be structured and related to each other, such as user information and their relationships.
Relational databases scale efficiently in most cases. As the amount of data and the number of users grow, relational databases can handle the increased load by optimizing queries and managing indexes. This means that as long as the database is properly designed and optimized, it can handle a significant amount of data and user activity without performance issues.
However, in some cases, when an application experiences extremely high traffic or deals with massive amounts of data, even a well-optimized relational database may face scalability challenges.
In situations where the workload grows, it is apply vertical scaling. Vertical scaling involves upgrading hardware resources or optimizing the database configuration to increase the capacity of a single database instance, such as adding more memory or CPU power. This approach is typically sufficient, but sometimes s it becomes practically impossible to further scale vertically.
At that point, a natural transition is to employ horizontal scaling through a technique called sharding. Sharding involves distributing the data across multiple database instances or servers, where each instance or server is responsible for a subset of the data. By dividing the workload among multiple database nodes, each node can handle a smaller portion of the data, resulting in improved performance and scalability.
In practice, implementing horizontal scaling with sharding in a real-world application is not as straightforward as it may seem. It requires careful planning and significant effort to ensure a smooth and successful transition.
### Code
We will use [Aspire PostgreSQL](https://learn.microsoft.com/en-us/dotnet/aspire/database/postgresql-entity-framework-component) component. See Aspire documentation to know what is actually means to “consume” Aspire Component. See [.NET Aspire components overview](https://learn.microsoft.com/en-us/dotnet/aspire/fundamentals/components-overview)
Here is how to configure `AppHost`. Add `Aspire.Hosting.PostgreSQL` package and configure it:
```csharp
var builder = DistributedApplication.CreateBuilder(args);
var usersDb = builder
.AddPostgres("dbserver")
.WithDataVolume()
.WithPgAdmin(c => c.WithHostPort(5050))
.AddDatabase("users-db");
var api = builder
.AddProject<Projects.Api>("api")
.WithReference(usersDb);
var migrator = builder
.AddProject<Projects.MigrationService>("migrator")
.WithReference(usersDb);
```
Add `Aspire.Npgsql.EntityFrameworkCore.PostgreSQL` and register `UsersDbContext` via `AddNpgsqlDbContext` method:
```csharp
var builder = WebApplication.CreateBuilder(args);
builder.AddServiceDefaults();
builder.AddNpgsqlDbContext<UsersDbContext>("users-db");
var app = builder.Build();
app.MapUsersEndpoints();
app.MapDefaultEndpoints();
app.Run();
```
Use `DbContext` regularly:
```csharp
var users = app.MapGroup("/users");
users.MapGet(
"/{id:int}/followers",
async Task<Results<Ok<List<UserSummaryModel>>, NotFound>> (
int id,
UsersDbContext dbContext,
CancellationToken cancellationToken
) =>
{
var user = await dbContext
.Users.Where(u => u.UserId == id)
.Include(u => u.Followers)
.ThenInclude(f => f.Follower)
.FirstOrDefaultAsync(cancellationToken);
if (user == null)
{
return TypedResults.NotFound();
}
var followers = user
.Followers.Select(x => x.Follower)
.ToUserSummaryViewModel()
.ToList();
return TypedResults.Ok(followers);
}
)
.WithName("GetUserFollowers")
.WithTags(Tags)
.WithOpenApi();
}
```
Here is how to retrieve followers of a user:
```bash
❯ curl -X 'GET' 'http://localhost:51909/users/1/followers' -s | jq
# [
# {
# "id": 522,
# "name": "Jerome Kilback",
# "email": "Jerome_Kilback12@gmail.com"
# },
# {
# "id": 611,
# "name": "Ernestine Schiller",
# "email": "Ernestine_Schiller@hotmail.com"
# }
# ]
```
💡 See source code for more details of how to represent a user and follower relationship.
💡 See source code to learn how to apply database migrations and use Bogus to seed the data.
## Application Design. Add Redis
Redis can be used as a first-level cache in an application to improve performance and reduce the load on the primary data source, such as a database.
A first-level cache, also known as an in-memory cache, is a cache that resides closest to the application and stores frequently accessed data. It is typically implemented using fast and efficient data stores, such as Redis, to provide quick access to the cached data.
When a request is made to retrieve data, the application first checks the first-level cache. If the data is found in the cache, it is returned immediately, avoiding the need to query the primary data source. This significantly reduces the response time and improves the overall performance of the application.
To use Redis as a first-level cache, the application needs to implement a caching layer that interacts with Redis. When data is requested, the caching layer checks if the data is present in Redis. If it is, the data is returned from the cache. If not, the caching layer retrieves the data from the primary data source, stores it in Redis for future use, and then returns it to the application.
By using Redis as a first-level cache, applications can significantly reduce the load on the primary data source, improve response times, and provide a better user experience.
### Code
It is very easy to setup Redis Output Caching Component.
Just install `Aspire.StackExchange.Redis.OutputCaching` and use it like this:
From the `AppHost`:
```csharp
var builder = DistributedApplication.CreateBuilder(args);
var redis = builder.AddRedis("cache");
var usersDb = builder
.AddPostgres("dbserver")
.WithDataVolume()
.WithPgAdmin(c => c.WithHostPort(5050))
.AddDatabase("users-db");
var api = builder
.AddProject<Projects.Api>("api")
.WithReference(usersDb)
.WithReference(redis);
```
From the consuming service:
```csharp
var builder = WebApplication.CreateBuilder(args);
builder.AddServiceDefaults();
builder.AddNpgsqlDbContext<UsersDbContext>("users-db");
builder.AddRedisOutputCache("cache"); // <-- add this
var app = builder.Build();
app.MapUsersEndpoints();
app.MapDefaultEndpoints();
app.UseOutputCache(); // <-- add this
app.Run();
```
Just add one-liner using `CacheOutput` method, meta-programming at this’s best 😎:
```csharp
var users = app.MapGroup("/users");
users
.MapGet(
"",
async (
UsersDbContext dbContext,
CancellationToken cancellationToken
) =>
{
var users = await dbContext
.Users.ProjectToViewModel()
.OrderByDescending(u => u.FollowersCount)
.ToListAsync(cancellationToken);
return TypedResults.Ok(users);
}
)
.WithName("GetUsers")
.WithTags(Tags)
.WithOpenApi()
.CacheOutput(); // <-- add this
```
Here is first hit to the API, it takes ~25ms:
<center>
<img src="https://nikiforovall.github.io/assets/polyglot-persitance/get-users.png" style="margin: 15px;">
</center>
And here is subsequent request, it takes ~6ms:
<center>
<img src="https://nikiforovall.github.io/assets/polyglot-persitance/get-users-cached.png" style="margin: 15px;">
</center>
💡Note, in the real-world scenario, the latency reduction can be quite significant when using Redis as a caching layer. For instance, consider an application that initially takes around 120ms to fetch data directly from a traditional SQL database. After implementing Redis for caching, the same data retrieval operation might only take about 15ms. This represents a substantial decrease in latency, improving the application’s responsiveness and overall user experience.
## Application Design. Add MongoDb
NoSQL databases, such as MongoDB, are well-suited for storing unstructured or semi-structured data like posts and related likes in a social media application. Unlike relational databases, NoSQL databases do not enforce a fixed schema, allowing for flexible and dynamic data models.
In a NoSQL database, posts can be stored as documents, which are similar to JSON objects. Each document can contain various fields representing different attributes of a post, such as the post content, author, timestamp, and likes. The likes can be stored as an array within the post document, where each element represents a user who liked the post.
One of the key advantages of using NoSQL databases for storing posts and related likes is the ability to perform efficient point reads. Point reads refer to retrieving a single document or a specific subset of data from a database based on a unique identifier, such as the post ID.
NoSQL databases like MongoDB use indexes to optimize point reads. By creating an index on the post ID field, the database can quickly locate and retrieve the desired post document based on the provided ID. This allows for fast and efficient retrieval of individual posts and their associated likes.
Furthermore, NoSQL databases can horizontally scale by distributing data across multiple servers or nodes. This enables high availability and improved performance, as the workload is divided among multiple instances. As a result, point reads can be performed in parallel across multiple nodes, further enhancing the efficiency of retrieving posts and related likes.
MongoDB excels at this because it was designed with built-in support for horizontal scaling. This means you can easily add more servers as your data grows, without any downtime or interruption in service.
### Code
Adding [MongoDb Component](https://learn.microsoft.com/en-us/dotnet/aspire/database/mongodb-component) is straightforward, the process is similar to adding other databases:
Add to `AppHost`:
```csharp
var builder = DistributedApplication.CreateBuilder(args);
var postsDb = builder
.AddMongoDB("posts-mongodb")
.WithDataVolume()
.WithMongoExpress(c => c.WithHostPort(8081))
.AddDatabase("posts-db");
var api = builder
.AddProject<Projects.Api>("api")
.WithReference(postsDb);
```
Consuming service:
```csharp
var builder = WebApplication.CreateBuilder(args);
builder.AddServiceDefaults();
builder.AddMongoDBClient("posts-db");
var app = builder.Build();
app.MapPostsEndpoints();
app.MapDefaultEndpoints();
app.Run();
```
To use it, we define a simple wrapper client over a MongoDb collection:
```csharp
public class PostService
{
private readonly IMongoCollection<Post> collection;
public PostService(
IMongoClient mongoClient,
IOptions<MongoSettings> settings
)
{
var database = mongoClient.GetDatabase(settings.Value.Database);
this.collection = database.GetCollection<Post>(settings.Value.Collection);
}
public async Task<Post?> GetPostByIdAsync(
string id,
CancellationToken cancellationToken = default
) =>
await this
.collection.Find(x => x.Id == id)
.FirstOrDefaultAsync(cancellationToken);
}
```
Notice, `IMongoClient` is added to the DI by `AddMongoDBClient` method.
```csharp
var posts = app.MapGroup("/posts");
posts
.MapGet(
"/{postId}",
async Task<Results<Ok<PostViewModel>, NotFound>> (
string postId,
PostService postService,
CancellationToken cancellationToken
) =>
{
var post = await postService.GetPostByIdAsync(postId, cancellationToken);
return post == null
? TypedResults.NotFound()
: TypedResults.Ok(post.ToPostViewModel());
}
)
.WithName("GetPostById")
.WithTags(Tags)
.WithOpenApi();
```
## Application Design. Add Elasticsearch
Elasticsearch is a powerful search and analytics engine that is commonly used for full-text search and data analysis in applications. It is designed to handle large volumes of data and provide fast and accurate search results.
To use Elasticsearch for full-text search, you need to index your data in Elasticsearch. The data is divided into documents, and each document is composed of fields that contain the actual data. Elasticsearch indexes these documents and builds an inverted index, which allows for efficient searching.
To search for posts using Elasticsearch, you can perform a full-text search query. This query can include various parameters, such as the search term, filters, sorting, and pagination. Elasticsearch will analyze the search term and match it against the indexed documents, returning the most relevant results.
Elasticsearch is also well-suited for performing analytics tasks, such as calculating leaderboards. Elasticsearch aggregation feature allows you to group and summarize data based on certain criteria. For example, you can aggregate likes by author and calculate the number of likes for each author.
One of the key advantages of Elasticsearch is its ability to scale horizontally, allowing you to handle large volumes of data and increasing the capacity of your search and analytics system.
To achieve scalability, Elasticsearch uses a distributed architecture. It allows you to create a cluster of multiple nodes, where each node can hold a portion of the data and perform search and indexing operations. This distributed nature enables Elasticsearch to handle high traffic loads and provide fast response times.
When you add more nodes to the cluster, Elasticsearch automatically redistributes the data across the nodes, ensuring that the workload is evenly distributed. This allows you to scale your system by simply adding more hardware resources without any downtime or interruption in service.
In addition to distributing data, Elasticsearch also supports data replication. By configuring replica shards, Elasticsearch creates copies of the data on multiple nodes. This provides fault tolerance and high availability, as the system can continue to function even if some nodes fail.
### Code
As for now, there is no official Elasticsearch Component for Aspire, the work is in progress. But, it is possible to define custom Aspire Component and share them as a Nuget package.
💡 For the sake of simplicity, I will not explain how to add Elasticsearch Aspire Component, please see source code for more details.
Assuming we already have Elasticsearch component, here is how to add it to `AppHost`:
```csharp
var builder = DistributedApplication.CreateBuilder(args);
var redis = builder.AddRedis("cache");
var postsDb = builder
.AddMongoDB("posts-mongodb")
.WithDataVolume()
.WithMongoExpress(c => c.WithHostPort(8081))
.AddDatabase("posts-db");
var elastic = builder
.AddElasticsearch("elasticsearch", password, port: 9200)
.WithDataVolume();
var api = builder
.AddProject<Projects.Api>("api")
.WithReference(elastic);
```
Add it to consuming services:
```csharp
var builder = WebApplication.CreateBuilder(args);
builder.AddServiceDefaults();
builder.AddElasticClientsElasticsearch("elasticsearch");
builder.AddMongoDBClient("posts-db");
var app = builder.Build();
app.MapPostsEndpoints();
app.MapDefaultEndpoints();
app.Run();
```
As result, we have `ElasticsearchClient` inject into the DI.
But how do we get data into Elasticsearch? Elasticsearch isn’t typically used as a primary database. Instead, it’s used as a secondary database that’s optimized for read operations, especially search. So, we take our data from our primary database (MongoDb), break it down into smaller, simpler pieces, and then feed it into Elasticsearch. This makes it easier for Elasticsearch to search through the data quickly and efficiently.
#### Search
💡The process of reliable data denormalization is out of scope of this article. A straightforward implementation might be to write the data to the primary database and then to the secondary one.
Assuming we already have data in Elasticsearch, let’s see how to query it:
```csharp
public class ElasticClient(ElasticsearchClient client)
{
private const string PostIndex = "posts";
public async Task<IEnumerable<IndexedPost>> SearchPostsAsync(
PostSearch search,
CancellationToken cancellationToken = default
)
{
var searchResponse = await client.SearchAsync<IndexedPost>(
s =>
{
void query(QueryDescriptor<IndexedPost> q) =>
q.Bool(b =>
b.Should(sh =>
{
sh.Match(p =>
p.Field(f => f.Title).Query(search.Title)
);
sh.Match(d =>
d.Field(f => f.Content).Query(search.Content)
);
})
);
s.Index(PostIndex).From(0).Size(10).Query(query);
},
cancellationToken
);
EnsureSuccess(searchResponse);
return searchResponse.Documents;
}
}
```
In the code above we are performing full-text search on “Title” and “Content” fields and returning top 10 results.
And here is how to use it:
```csharp
var posts = app.MapGroup("/posts");
posts
.MapGet(
"/search",
async (
[FromQuery(Name = "q")] string searchTerm,
ElasticClient elasticClient,
PostService postService,
CancellationToken cancellationToken
) =>
{
var posts = await elasticClient.SearchPostsAsync(
new() { Content = searchTerm, Title = searchTerm },
cancellationToken
);
IEnumerable<Post> result = [];
if (posts.Any())
{
result = await postService.GetPostsByIds(
posts.Select(x => x.Id),
cancellationToken
);
}
return TypedResults.Ok(result.ToPostViewModel());
}
)
.WithName("SearchPosts")
.WithTags(Tags)
.WithOpenApi();
```
The typical pattern in this scenario is to search for posts in Elasticsearch and retrieve the full representation from the primary database (MongoDB).
#### Analytics
Another interesting task that can be solved via Elasticsearch is analytics. Elasticsearch excels at analyzing large amounts of data. It provides real-time analytics, which means you can get insights from your data as soon as it is indexed. This is particularly useful for time-sensitive data or when you need to monitor trends, track changes, and make decisions quickly. Its powerful aggregation capabilities allow you to summarize, group, and calculate data on the fly, making it a great tool for both search and analytics.
Here is how to calculate Leader Board for the social media application:
```csharp
public async Task<AnalyticsResponse> GetAnalyticsDataAsync(
AnalyticsRequest request,
CancellationToken cancellationToken = default
)
{
const string Key = "user_likes";
var aggregationResponse = await client.SearchAsync<IndexedLike>(
s =>
s.Index(LikeIndex)
.Size(0)
.Query(q =>
{
q.Range(r =>
r.DateRange(d =>
{
d.Gte(request.start.Value.ToString("yyyy-MM-dd"));
d.Lte(request.end.Value.ToString("yyyy-MM-dd"));
})
);
})
.Aggregations(a =>
a.Add(Key,
t => t.Terms(f => f.Field(f => f.AuthorId).Size(request.top)))),
cancellationToken
);
EnsureSuccess(aggregationResponse);
// processes aggregation result and returns UserId to NumberOfLikes dictionary
return new AnalyticsResponse(aggregationResponse);
}
```
And here is how to retrieve the users with the highest number of likes and enrich the data from the primary database:
```csharp
posts
.MapPost(
"/analytics/leaderboard",
async (
[FromQuery(Name = "startDate")] DateTimeOffset? startDate,
[FromQuery(Name = "endDate")] DateTimeOffset? endDate,
ElasticClient elasticClient,
UsersDbContext usersDbContext,
CancellationToken cancellationToken
) =>
{
var analyticsData =
await elasticClient.GetAnalyticsDataAsync(new(startDate, endDate),cancellationToken);
var userIds = analyticsData
.Leaderboard.Keys.Select(x => x)
.ToList();
var users = await usersDbContext
.Users.Where(x => userIds.Contains(x.UserId))
.ToListAsync(cancellationToken: cancellationToken);
return TypedResults.Ok(
users
.Select(x => new
{
x.UserId,
x.Name,
x.Email,
LikeCount = analyticsData.Leaderboard[x.UserId],
})
.OrderByDescending(x => x.LikeCount)
);
}
)
.WithName("GetLeaderBoard")
.WithTags(Tags)
.WithOpenApi();
```
## Putting everything together. Migration
The `AppHost` serves as the **composition root** of a distributed system, where high-level details about the system’s architecture and components are defined and configured.
In the `AppHost`, you can define and configure various components that make up the distributed system. These components can include databases, message brokers, caching systems, search engines, and other services that are required for the system to function.
As result, `AppHost` looks like following:
```csharp
var builder = DistributedApplication.CreateBuilder(args);
var usersDb = builder
.AddPostgres("dbserver")
.WithDataVolume()
.WithPgAdmin(c => c.WithHostPort(5050))
.AddDatabase("users-db");
var postsDb = builder
.AddMongoDB("posts-mongodb")
.WithDataVolume()
.WithMongoExpress(c => c.WithHostPort(8081))
.AddDatabase("posts-db");
var elastic = builder
.AddElasticsearch("elasticsearch", port: 9200)
.WithDataVolume();
var redis = builder.AddRedis("cache");
var messageBus = builder
.AddRabbitMQ("messaging", port: 5672)
.WithDataVolume()
.WithManagementPlugin();
var api = builder
.AddProject<Projects.Api>("api")
.WithReference(usersDb)
.WithReference(postsDb)
.WithReference(elastic)
.WithReference(redis)
.WithReference(messageBus);
var migrator = builder
.AddProject<Projects.MigrationService>("migrator")
.WithReference(postsDb)
.WithReference(elastic)
.WithReference(usersDb);
builder.Build().Run();
```
As you can see, it quite easy to put everything together.
When working on a project, it is generally a good practice to maintain consistency in how you organize and structure your code. This includes how you reference and use resources within your project.
For example, we have the “migrator” service that references other resources in the same way as “api” service does.
### Migration
The `MigrationService` is responsible for databases migration and seeding.
Here is how to generate test data:
```csharp
private static (List<Post>, List<IndexedLike>) GeneratePosts()
{
var faker = new Faker<Post>()
.RuleFor(p => p.Title, f => f.Lorem.Sentence())
.RuleFor(p => p.Content, f => f.Lorem.Paragraph())
.RuleFor(p => p.ExternalId, f => f.Random.AlphaNumeric(10))
.RuleFor(p => p.CreatedAt, f => f.Date.Past())
.RuleFor(p => p.AuthorId, f => f.Random.Number(1, numberOfUsers));
var posts = faker.Generate(numberOfPosts).ToList();
var likeFaker = new Faker<IndexedLike>()
.RuleFor(l => l.PostId, f => f.PickRandom(posts).ExternalId)
.RuleFor(l => l.LikedBy, f => f.Random.Number(1, numberOfUsers))
.RuleFor(l => l.CreatedAt, f => f.Date.Past());
var likes = likeFaker
.Generate(numberOfLikes)
.GroupBy(l => l.PostId)
.ToDictionary(g => g.Key, g => g.ToList());
foreach (var post in posts)
{
var postLikes = likes.GetValueOrDefault(post.ExternalId) ?? [];
post.Likes.AddRange(postLikes.Select(x => x.LikedBy));
foreach (var l in postLikes)
{
l.AuthorId = post.AuthorId;
}
}
return (posts, likes.Values.SelectMany(x => x).ToList());
}
```
The migration process is instrumented via OpenTelemetry and you can inspect how much it takes to execute the migration and seeding process per-database.
<center>
<img src="https://nikiforovall.github.io/assets/polyglot-persitance/migration-trace.png" style="margin: 15px;">
</center>
💡As you can see, it takes some time for Elasticsearch to boot up. This is one of the examples that demonstrate why it is important to use resiliency patterns to build more robust and reliable systems.
## Conclusion
Polyglot persistence is a powerful approach to designing data storage solutions for applications. By leveraging the strengths of different databases, developers can build efficient and scalable systems that meet the specific requirements of their applications.
In this post, we explored how to implement polyglot persistence in a social media application using PostgreSQL, Redis, MongoDB, and Elasticsearch. Each database was used for a specific purpose, such as storing user data, caching, storing posts, and performing search and analytics tasks.
By carefully selecting the appropriate databases for each use case, developers can design robust and performant applications that deliver a great user experience. The flexibility and scalability provided by polyglot persistence enable applications to handle diverse workloads and data requirements, ensuring that they can grow and evolve over time.
## References
- [https://github.com/dotnet/aspire-samples](https://github.com/dotnet/aspire-samples)
- [https://github.com/NikiforovAll/social-media-app-aspire](https://github.com/NikiforovAll/social-media-app-aspire) | nikiforovall |
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