id int64 5 1.93M | title stringlengths 0 128 | description stringlengths 0 25.5k | collection_id int64 0 28.1k | published_timestamp timestamp[s] | canonical_url stringlengths 14 581 | tag_list stringlengths 0 120 | body_markdown stringlengths 0 716k | user_username stringlengths 2 30 |
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1,906,537 | A guide into REACT AND SVELTE | As you journey into frontend development, the first thought that comes to mind is: i want to learn... | 0 | 2024-06-30T11:25:44 | https://dev.to/ejiroosiephri/a-guide-into-react-and-svelte-372p | webdev, hng, hng11, frontendtechnologies | As you journey into frontend development, the first thought that comes to mind is: i want to learn React. Yes about 70% of developers are conversant with react. Why? React is the most popular of frontend UI library.
In this short article, i will be guiding you through other frontend frameworks like react that you probably haven’t come across yet. And i would be sharing my experiences and how i chose to join one of the best intern program in the world.
Let’s Get Started
We would be talking about two Niche’s in frontend development and few contrasts, advantages and disadvantages of both.
The two frontend technologies are REACTJS and SVELTE
Let’s start with react, to be honest, one of the reason i started with react is one of the features that attracts many other developers, The ECOSYSTEM.
The community and ecosystem of reactJs is so large, a lot of libraries are easily integrated into react, So migrating from writing plain Javascript code doesn’t look to strange, thus making react easy to understand and to work with. Even a popular framework like NextJs is seemlessly integrated into react.
Another feature that draws big companies as well as seasoned developers and beginners to get into the react community is the JSX FEATURE.
This allows the knowledge of HTML we learnt and all the lot’s of technolgies we learnt in the begining of our HTML CSS and JS phase didn’t go to waste.
The JSX feature allows you to write HTML like structured code in javascript, imagine how fun that would be. Fun fact: React was built by Facebook, one of the leading social media platforms in the world.
Now let’s talk about something you might have heard of until now, SVELTE.
You might think react is the most straightforward language to learn, but when compared to SVELTE react is like a short man trying to score a 3 pointer from the half way line.
Svelte is different from traditional based frameworks, it is a compiller-based framework that makes use of step by step compiler process and doesn’t make use of react core feature, THE VIRTUAL DOM.
One of the reason why developers use svelte is because it is lightweight and the ease of learning in off the charts, another is the fact that is supports scoped CSS by default and you don’t have to worry about global naming confilcts like that of REACTJS.
The can fix the naming conflicts by using .module.css to make the styles apply to that component alone.
You can see the stress this might place on you.
Let’s now talk about some differences between REACT AND SVELTE.
Performance-wise svelte is lightweight so it has better runtime performance and smaller bundle size compared to react virtual DOM diffing. So speed wise svelte would be faster.
But reactJS is mature and have a wide ECOSYSTEM as well as a broad documentation as opposed to svelte with a growing Ecosystem.
This is one of the reason why i took interest in HNG as i want to learn about key frontend libraries, frameworks in a very competitive environment, work with team members, learn from my mistakes and get better.
HNG is one of the leading internship program you can ever join when considering the aspect of development in general and i look to gather a lot of experiences from the program.
You can also participate in this intenship program by following this two links below https://hng.tech/internship or this https://hng.tech/premium to join and learn about all this key frontend technologies and solidify your knowledge in ReactJS and others.
| ejiroosiephri |
1,906,533 | Seat Bearings: Providing Stability and Durability in Automotive Seats | Seat Bearings: Keeping Automotive Seats Safe and Comfortable Introduction Are you currently sick and... | 0 | 2024-06-30T11:20:07 | https://dev.to/hdbhf_jjfnf_2d21824853454/seat-bearings-providing-stability-and-durability-in-automotive-seats-36jl | Seat Bearings: Keeping Automotive Seats Safe and Comfortable
Introduction
Are you currently sick and tired with experiencing uncomfortable and unstable if you should be driving or riding in a motor car or automobile? It isn't just you! People encounter vexation once they sit most of the shows genuine in a motor youngster carseat for too time a deal it is great. This is certainly whenever Seat Bearings are presented in - they assist offer security and durability in automotive seats. Let us have much better look into Seat Bearings and how you shall be gained by them.
Popular top of Seat Bearings
Seat Bearings are now a sort or number of bearing which will surely help seats which might be automotive and efficiently just. They've been made out of top-quality materials since they're developed to withstand the deterioration of everyday usage. The options and this can be various are top have Seat Bearings consist of:
1. Stability: bearing 6206 assist maintain your chair set up, even when you are stopping or switching perhaps not nowhere. It shall assist avoid accidents and keeps you safe while driving.
2. Durability: Seat Bearings are manufactured to final. They've been typically built to withstand the weight extra is additional is extra is extra is extra the sitting that's certain in addition to resist use and tear to your run quite lengthy.
3. Comfort: Seat Bearings create your car or truck drive more at convenience by reducing vibrations and sound. It will also assistance with preventing back vexation and various discomforts has sitting frequently in a engine vehicle for acutely durations being very long.
Innovation in Seat Bearings
Seat Bearings have developed inside the full years that could be complete are efficient and effective. New technology is in fact developed to make Seat Bearings additionally more sturdy and sturdy. Innovations in Seat Bearings have:
1. Self-lubrication: Some Seat 6202 bearing are manufactured to lubricate by themselves, which decreases the requirement for regular upkeep and repairs.
2. Advanced materials: New materials happen developed to generate Seat Bearings more cost-effective and a complete quantity big of things durable.
3. design this might be enhanced Seat Bearings have now been redesigned become lightweight and scaled-down, assisting to ensure they truly are safer to create then make use of.
Security in Seat Bearings
Security is demonstrably an presssing issue this might be top it comes down right down due to things that could be automotive and Seat Bearings are not any exclusion this is genuine. Seat Bearings are manufactured to help to simply help to hold you safe if you are driving. Protection features in Seat Bearings consist of:
1. Anti-lock procedure: Some Seat Bearings have an anti-lock system which will surely help stop the chair from sliding or going during unexpected stops or turns.
2. Crash resistance: Seat Bearings are created to resist harm during accidents, which will surely help protect both you and your people.
3. ADAS integration: Some Seat Bearings might be supplied Advanced Driver Assistance Systems (ADAS) to enhance security on the road.
Just how to Use Seat Bearings
Using Seat Bearings is simple and straightforward. They are typically created to be properly used in automotive seats, along with is manufactured effectively. The following is just how to utilize Seat Bearings:
1. choose Seat bearings car right make sure you decide on Seat Bearings being perfect for your car or truck or car or car's make and model.
2. eliminate thE centre bearing that can be old you're going to need certainly to just take them straight down before you start the that exists if you are Seat changing that old Bearings afternoon.
3. Install the Seat this may be Bearings this is completely new this is the axioms for example your Seat Bearings to generate them in your vehicle or automobile or automobile or car.
Service and Quality of Seat Bearings
You need to select Seat this could be Bearings top-notch are to final. Search for Seat Bearings that are manufactured from top-quality materials and provide a warranty exceptional. If you're Seat bearings that are seeking to make the journey to get:
1. Manufacturing standards: choose Seat Bearings being manufactured to manufacturing it is high to ensure their quality and durability.
2. Lifetime guarantee: try to find Seat Bearings which will come acquiring the life complete is guarantee complete be sure to might be buying a item which could endure.
3. Customer reviews: browse consumer reviews of Seat Bearings to get a feeling of a supplementary individuals understand why item.
Application of Seat Bearings
Seat Bearings works very well in a assortment obviously wide of seats, including:
1. kid youngster baby kid son or daughter baby car seats: Seat Bearings are observed in youngster infant youngster baby youngster baby child car seats security presenting convenience.
2. vehicle seats: Seat Bearings can be utilized in kid youngster baby car seats in decreasing sound and vibrations.
3. Motorcycle seats: Seat Bearings can be utilized in bike seats in reducing weakness and vexation during long trips.
| hdbhf_jjfnf_2d21824853454 | |
1,906,532 | Embark on a Kubernetes Learning Adventure 🚀 | The article is about a comprehensive collection of 10 Kubernetes-focused challenges provided by LabEx, a leading provider of hands-on programming tutorials. The challenges cover a wide range of Kubernetes topics, including resource monitoring with Prometheus, resource management with LimitRange, container readiness with ContainerProbe, secure API access with Service Accounts, node scheduling control with Cordon and Uncordon, container management in Pods, task automation with Jobs and Cronjobs, secure API server access with Proxy, RBAC-based access control, and the deployment of Jenkins in a Kubernetes environment. The article offers a detailed overview of each challenge, providing valuable insights and practical guidance to help readers deepen their understanding and mastery of Kubernetes. | 27,732 | 2024-06-30T11:19:33 | https://dev.to/labex/embark-on-a-kubernetes-learning-adventure-jkf | kubernetes, coding, programming, tutorial |
Kubernetes, the powerful container orchestration platform, has become a game-changer in the world of modern application deployment and management. LabEx, a leading provider of hands-on programming tutorials, offers a comprehensive collection of Kubernetes-focused challenges that will guide you through the intricacies of this transformative technology.
## Kubernetes Resource Monitoring: Harnessing the Power of Prometheus 📊
Prometheus, an open-source instrumentation framework, is a perfect fit for monitoring complex Kubernetes workloads. In this [challenge](https://labex.io/labs/7774), you'll dive into the world of Kubernetes resource monitoring and learn how to leverage Prometheus to absorb and analyze massive amounts of data, ensuring the optimal performance and health of your Kubernetes clusters.
## Kubernetes LimitRange: Mastering Resource Management 🔍
Resource contention can be a common challenge in Kubernetes environments. This [challenge](https://labex.io/labs/29344) focuses on Kubernetes LimitRange, a feature that helps you manage the resources allocated to pods and prevent resource contention issues. Explore how to effectively set limits on resource consumption and ensure the efficient utilization of your Kubernetes cluster.
## ContainerProbe: Ensuring Kubernetes Readiness 🔍
In Kubernetes, probes are essential diagnostic tools used to determine the health and readiness of containers. This [challenge](https://labex.io/labs/18858) delves into ContainerProbe, a tool that helps you detect when a container is ready to accept traffic. Learn how to leverage ContainerProbe to ensure the smooth and reliable operation of your Kubernetes-based applications.
## Kubernetes Service Account: Secure API Access 🔒
Kubernetes Service Account is a mechanism for authenticating with the Kubernetes API server. This [challenge](https://labex.io/labs/23336) will guide you through the process of understanding and implementing Service Accounts, empowering you to securely access the Kubernetes API and manage your cluster resources.
## Kubernetes Cordon and Uncordon: Controlling Node Scheduling 🔧
Nodes in a Kubernetes cluster can have various states, such as 'ready' or 'not ready'. This [challenge](https://labex.io/labs/67176) explores the cordon and uncordon commands, which allow you to control the scheduling of pods on specific nodes. Discover how to effectively manage node scheduling and ensure the optimal distribution of your Kubernetes workloads.
## Running Containers in Pods: The Fundamental Building Blocks 🧱
Pods are the smallest and simplest units in Kubernetes, and they can contain one or more containers. This [challenge](https://labex.io/labs/16235) focuses on running containers in Kubernetes Pods, providing you with the knowledge to leverage the benefits of better resource utilization, easier scaling, and more efficient deployment.
## Jobs and Cronjobs: Automating Tasks in Kubernetes 🕰️
Kubernetes offers two powerful constructs, Jobs and Cronjobs, to run tasks that are not part of a long-running application or service. This [challenge](https://labex.io/labs/18265) will teach you how to leverage Jobs for one-off tasks and Cronjobs for scheduled tasks, empowering you to automate your Kubernetes workflows.
## Kubernetes Proxy: Accessing the API Server Securely 🔒
The Kubernetes proxy command allows you to access the Kubernetes API server from your local machine without exposing the API server to the public internet. This [challenge](https://labex.io/labs/23718) will guide you through the process of using the Kubernetes proxy command, enabling you to securely debug and troubleshoot your Kubernetes clusters.
## RBAC: Controlling Access in Kubernetes 🔑
In a Kubernetes cluster, Role-Based Access Control (RBAC) is used to manage access to resources and operations. This [challenge](https://labex.io/labs/18455) will teach you how to leverage RBAC to define roles and permissions, ensuring that users, groups, and service accounts have the appropriate access to your Kubernetes resources.
## Deploying Jenkins in Kubernetes: Automating Your Workflows 🤖
Jenkins, a popular automation server, can be deployed in a Kubernetes cluster to take advantage of the scalability and flexibility offered by container orchestration. This [challenge](https://labex.io/labs/67178) will guide you through the process of deploying Jenkins in your Kubernetes environment, empowering you to automate your software development and deployment workflows.
Embark on this Kubernetes learning adventure and unlock the full potential of this transformative technology. With the comprehensive collection of challenges provided by LabEx, you'll gain hands-on experience and deepen your understanding of Kubernetes, positioning yourself as a proficient Kubernetes practitioner. 🚀
---
## Want to learn more?
- 🌳 Learn the latest [Kubernetes Skill Trees](https://labex.io/skilltrees/kubernetes)
- 📖 Read More [Kubernetes Tutorials](https://labex.io/tutorials/category/kubernetes)
- 🚀 Practice thousands of programming labs on [LabEx](https://labex.io)
Join our [Discord](https://discord.gg/J6k3u69nU6) or tweet us [@WeAreLabEx](https://twitter.com/WeAreLabEx) ! 😄 | labby |
1,906,526 | Step-by-step guide to MultiversX smart contract interactions with JavaScript SDK | In the fourth article of the series on MultiversX JavaScript SDK, we will examine how to interact... | 27,816 | 2024-06-30T11:14:07 | https://www.julian.io/articles/multiversx-js-sdk-sc-interactions.html | javascript, multiversx, web3, blockchain | In the fourth article of the series on MultiversX JavaScript SDK, we will examine how to interact with deployed smart contracts. As in the previous article, where we tackled smart contract deployment, we will use the [Piggy Bank](https://github.com/xdevguild/piggy-bank-sc) smart contract as an example.
The script is more complex than the previous ones because we will handle calls for three different functions on the smart contract: `createPiggy`, `addAmount`, and `getLockedAmount`. The first two are write functions, and the third one is a read function.
Again, let's see the whole script first, and we will go through it step by step.
```javascript
import { promises } from "node:fs";
import {
Address,
SmartContractTransactionsFactory,
TransactionsFactoryConfig,
TransactionComputer,
AbiRegistry,
QueryRunnerAdapter,
SmartContractQueriesController,
} from "@multiversx/sdk-core";
import {
syncAndGetAccount,
senderAddress,
getSigner,
apiNetworkProvider,
} from "./setup.js";
/**
* Replace with your own deployed piggy bank smart contract
* check deploy-smart-contract.js on how to deploy one
*/
const PIGGYBANK_CONTRACT_ADDRESS =
"erd1qqqqqqqqqqqqqpgqtrajzw4vq0zxccdt9u66cvgg6vz8c6cwnegqkfqkpq";
/**
* Load ABI file
*/
const getAbi = async () => {
const abiFile = await promises.readFile("./piggybank.abi.json", "UTF-8");
return JSON.parse(abiFile);
};
const scTransaction = async ({ functionName, args, amount }) => {
const user = await syncAndGetAccount();
const computer = new TransactionComputer();
const signer = await getSigner();
const abiObj = await getAbi();
const factoryConfig = new TransactionsFactoryConfig({ chainID: "D" });
const factory = new SmartContractTransactionsFactory({
config: factoryConfig,
abi: AbiRegistry.create(abiObj),
});
const transaction = factory.createTransactionForExecute({
sender: new Address(senderAddress),
contract: Address.fromBech32(PIGGYBANK_CONTRACT_ADDRESS),
function: functionName,
gasLimit: 5000000,
arguments: args || [],
nativeTransferAmount: amount,
});
// Increase the nonce
transaction.nonce = user.getNonceThenIncrement();
// Serialize the transaction for signing
const serializedTransaction = computer.computeBytesForSigning(transaction);
// Sign the transaction with out signer
transaction.signature = await signer.sign(serializedTransaction);
// Broadcast the transaction
const txHash = await apiNetworkProvider.sendTransaction(transaction);
console.log(
"Check in the Explorer: ",
`https://devnet-explorer.multiversx.com/transactions/${txHash}`
);
};
/**
* Call the createPiggy endpoint on the PiggyBank smart contract
* https://github.com/xdevguild/piggy-bank-sc/blob/master/src/lib.rs#L25
* We pass the unix timestamp in the future
*/
const createPiggy = async () => {
await scTransaction({
functionName: "createPiggy",
args: [1750686756],
});
};
/**
* Call the addAmount endpoint on the PiggyBank smart contract
* https://github.com/xdevguild/piggy-bank-sc/blob/master/src/lib.rs#L42
*/
const addAmount = async () => {
await scTransaction({
functionName: "addAmount",
amount: 1000000000000000n,
});
};
/**
* Query the getLockedAmount endpoint on the PiggyBank smart contract
* https://github.com/xdevguild/piggy-bank-sc/blob/master/src/lib.rs#L92
*/
const getLockedAmount = async () => {
const abiObj = await getAbi();
const queryRunner = new QueryRunnerAdapter({
networkProvider: apiNetworkProvider,
});
const controller = new SmartContractQueriesController({
queryRunner: queryRunner,
abi: AbiRegistry.create(abiObj),
});
const query = controller.createQuery({
contract: PIGGYBANK_CONTRACT_ADDRESS,
function: "getLockedAmount",
arguments: [senderAddress],
});
const response = await controller.runQuery(query);
const [amount] = controller.parseQueryResponse(response);
// The returned amount is a BigNumber
console.log("Locked amount is: ", amount.valueOf());
};
/**
* Here we will manage which function to call
*/
const smartContractInteractions = () => {
const args = process.argv.slice(2);
const functionName = args[0];
const functions = {
createPiggy,
addAmount,
getLockedAmount,
};
if (functionName in functions) {
functions[functionName]();
} else {
console.log("Function not found!");
}
};
smartContractInteractions();
```
We have a `scTransaction` function, which is our common helper for the first two smart contract calls: `createPiggy` and `addAmount`. Let's analyze it first. Remember to watch the video embedded at the end of this article, where you'll see each step in detail.
```javascript
const scTransaction = async ({ functionName, args, amount }) => {
const user = await syncAndGetAccount();
const computer = new TransactionComputer();
const signer = await getSigner();
const abiObj = await getAbi();
const factoryConfig = new TransactionsFactoryConfig({ chainID: "D" });
const factory = new SmartContractTransactionsFactory({
config: factoryConfig,
abi: AbiRegistry.create(abiObj),
});
const transaction = factory.createTransactionForExecute({
sender: new Address(senderAddress),
contract: Address.fromBech32(PIGGYBANK_CONTRACT_ADDRESS),
function: functionName,
gasLimit: 5000000,
arguments: args || [],
nativeTransferAmount: amount,
});
// Increase the nonce
transaction.nonce = user.getNonceThenIncrement();
// Serialize the transaction for signing
const serializedTransaction = computer.computeBytesForSigning(transaction);
// Sign the transaction with our signer
transaction.signature = await signer.sign(serializedTransaction);
// Broadcast the transaction
const txHash = await apiNetworkProvider.sendTransaction(transaction);
console.log(
"Check in the Explorer: ",
`https://devnet-explorer.multiversx.com/transactions/${txHash}`
);
};
```
The `scTransaction` provides common logic for each smart contract write function. It looks similar to the transactions in previous articles. We prepare the transaction using a dedicated transaction factory. We increment the nonce, prepare for signing, sign, and broadcast the transaction.
What is different is that we use the `SmartContractTransactionsFactory` and then `createTransactionForExecute` which prepares the transaction for our functions on smart contract. It takes the sender, smart contract address, function name, and gas limit as arguments. Optionally, where required, you can pass arguments for the smart contract function, and if you need to send some native EGLD token amount, you can also do that with `nativeTransferAmount`. You'll see an example soon. Of course, we also need the address of the deployed smart contract. You can deploy yours using the deploy-smart-contract.js. Check the video below, and also, please check the previous article on smart contract deployments.
The `scTransaction` is used in the `createPiggy` and `addAmount` functions. For the first one, we pass the argument, which is the Unix timestamp in the future - our lock time for the Piggy Bank. In the second one, we don't have attributes, but we send the EGLD amount to lock. This amount will be locked until time passes.
```javascript
/**
* Call the createPiggy endpoint on the PiggyBank smart contract
* https://github.com/xdevguild/piggy-bank-sc/blob/master/src/lib.rs#L25
* We pass the unix timestamp in the future
*/
const createPiggy = async () => {
await scTransaction({
functionName: "createPiggy",
args: [1750686756],
});
};
/**
* Call the addAmount endpoint on the PiggyBank smart contract
* https://github.com/xdevguild/piggy-bank-sc/blob/master/src/lib.rs#L42
*/
const addAmount = async () => {
await scTransaction({
functionName: "addAmount",
amount: 1000000000000000n,
});
};
```
The third function is different. We don't need to trigger a transaction on the blockchain. We need to read the data on smart contract storage. We can do that by interacting with the network. For that, we can use some helpers from MultiversX SDK. First, let's see how it looks.
```javascript
const getLockedAmount = async () => {
const abiObj = await getAbi();
const queryRunner = new QueryRunnerAdapter({
networkProvider: apiNetworkProvider,
});
const controller = new SmartContractQueriesController({
queryRunner: queryRunner,
abi: AbiRegistry.create(abiObj),
});
const query = controller.createQuery({
contract: PIGGYBANK_CONTRACT_ADDRESS,
function: "getLockedAmount",
arguments: [senderAddress],
});
const response = await controller.runQuery(query);
const [amount] = controller.parseQueryResponse(response);
// The returned amount is a BigNumber
console.log("Locked amount is: ", amount.valueOf());
};
```
We need to define `QueryRunnerAdapter`, which takes the `networkProvider`. In our case, we use a standard API network provider from the MultiversX toolset (check the first article for more details), but you can also prepare your own network provider and use it here. Let's keep it simple and use the default API provider.
After that, we need to prepare `SmartContractQueriesController`. It will manage queries. It takes a previously defined query runner and the contents of the ABI file as `AbiRegistry`. With that, we will be able to parse the query's response.
So, with the controller, we can create a query where we pass the smart contract address, function name, and arguments, if any. Then, we can run the query and get the response. Finally we can parse the response and get the data we are interested in. In this case, it is the amount of locked EGLD on the smart contract. And that's it. We have the returned locked amount.
There is also a simple helper for this demo that manages which function we want to call. So, if you're going to call the `createPiggy` function, you use node `smart-contract-interactions.js createPiggy`. Let's see how it looks, but it isn't important here. Again, check the video below to see more of it.
```javascript
const smartContractInteractions = () => {
const args = process.argv.slice(2);
const functionName = args[0];
const functions = {
createPiggy,
addAmount,
getLockedAmount,
};
if (functionName in functions) {
functions[functionName]();
} else {
console.log("Function not found!");
}
};
```
**Summary**
There are two types of functions for MultiversX smart contracts. The write functions are where you need to broadcast a transaction, and read functions that don't need the transaction and are public to read through the network and APIs.
Interaction with both types is straightforward when you use the MultiversX JavaScript SDK. There are dedicated smart contract transaction factories and query controllers, which are especially helpful when you must parse the response. Here, we had a very simple value, but the returned data can be much more complex. When possible, use ABI files, and where it is not possible, use `TypedValues` from the SDK.
Follow me on X ([@theJulianIo](https://x.com/theJulianIo)) and YouTube ([@julian_io](https://www.youtube.com/channel/UCaj-mgcY9CWbLdZsC5Gt00g)) or [GitHub](https://github.com/juliancwirko) for more MultiversX magic.
Please check the tools I maintain: the [Elven Family](https://www.elven.family) and [Buildo.dev](https://www.buildo.dev). With Buildo, you can do a lot of management operations using a nice web UI. You can [issue fungible tokens](https://www.buildo.dev/fungible-tokens/issue), [non-fungible tokens](https://www.buildo.dev/non-fungible-tokens/issue). You can also do other operations, like [multi-transfers](https://www.buildo.dev/general-operations/multi-transfer) or [claiming developer rewards](https://www.buildo.dev/general-operations/claim-developer-rewards). There is much more.
**Walkthrough video**
{% embed https://www.youtube.com/watch?v=TMDC5yxT4_c %}
**The demo code**
- [learn-multiversx-js-sdk-with-examples](https://github.com/xdevguild/learn-multiversx-js-sdk-with-examples/tree/smart-contract-interactions)
| julian-io |
1,906,531 | Starting my career as a mobile developer: insights and experience. | Mobile dev has become an essential skill in our today's world. As a mobile developer I will share my... | 0 | 2024-06-30T11:10:16 | https://dev.to/jade_carnage_c442d55edf28/starting-my-career-as-a-mobile-developer-insights-and-experience-43n5 | Mobile dev has become an essential skill in our today's world. As a mobile developer I will share my journey and experience in the world of mobile development spaces (platforms)and software architecture pattern. In this I will explain the advantages and disadvantages of cadres and discuss my motivation for joining the [HNG internship](https://hng.tech/internship).
Hello my name is [Jade Agabi]( https://jade-portfolio-bice.vercel.app/) a student of ritman university, cybersecurity enthusiastst a frontend developer and an all round tech-dude. I got some few hobbies like basketball and coding. I started the HNG internship for the sole purpose of gaining extra knowledge, as the cost for learning mobile dev is so high I saw HNG internship as an opportunity to feed myself with more information about the tech world and I have high hopes that the internship will be profitable.
LETS TALK ABOUT MOBILE DEVELOPMENT PLATFORMS:
Mobile dev platforms are like the foundations upon which we build our application. Let's examine some popular ones:
ANDROID DEVELOPMENT WITH KOTLIN/JAVA
Android development primarily involves building apps for Android devices. See The two main programming language used for Android development are Kotlin and Java.
•KOTLIN
Kotlin is a modern, statically and typed language that is fully interoperable with Java. It has gained popularity due to it concise syntax and enhanced features.
•JAVA
Java has been a cornerstone in android development since platform's
Inception. It is a versatile, object-oriented programming language 'OOP' that is widely used not only in mobile dev but also in web, desktop and server-side application.
PROS AND CONS OF ANDROID DEVELOPMENT
PROS
1. Large User Base: Android has a vast user base globally, providing developers with a broad audience for their applications.
2. Open source platform: Android's Open-source nature allows developers to access and modify the source code, innovation and customization.
CONS
1. Fragmentation: fragmentation is a significant challenge in Android development. The vast number of devices, each with different hardware specifications and OS versions, can make it difficult to ensure consistent performance and comparability.
2. App monetization: monetizating android apps can due to high prevalence for free apps lower average revenue per user compared to iOS. And also there is a higher rate of privacy and unauthorized app distribution.
IOS DEVELOPMENT WITH SWIFT
Like it implies iOS development involves the creation of apps for Apple's iOS devices. Swift is the primary language used although Objective-C is still in use for legacy projects.
•SWIFT
Swift is a powerful, intuitive language created by Apple. It is designed to work seamlessly with Apple's frameworks and provide a modern development experience.
PROS AND CONS OF IOS DEVELOPMENT
PROS
1. High-quality user experience:iOS devices are known for their consistent and high-quality user experience. Apple's stringent design guidelines ensure that apps look and perform well across all iOS devices, providing the best user experience.
2. Monetization opportunity: iOS Users tend to spend more on apps And in app purchase compared to android users making them the best spot for new developers to generate income from their application.
CONS
1. Strict app review process:Apple's app review process is known for being strict and time-consuming. Apps can be rejected for various reasons, causing delays in deployment.
2. Development costs: Developing for iOS requires a Mac, which can be a significant upfront investment. Additionally, the annual fee for the Apple Developer Program is higher compared to Google's Play Console fee and in addition the cost of getting an iOS device I higher compared to an Android.
CONCLUSION
I been able to highlight the di
fferent platforms in which we can build our apps on and there advantages and disadvantages. Along the line I hope to learn new things on the internship to keep you updated
(To know more about the HNG internship [click here>](https://hng.tech/hire))
| jade_carnage_c442d55edf28 | |
1,906,529 | H4895 Powder in Stock | The world of reloading is vast and intricate, with enthusiasts constantly on the lookout for the... | 0 | 2024-06-30T11:06:07 | https://dev.to/brassproarmory/h4895-powder-in-stock-p65 |
The world of reloading is vast and intricate, with enthusiasts constantly on the lookout for the best supplies to ensure their ammunition performs at its peak. One such essential reloading component is the [h4895](https://brassproarmory.com/product/h4895-powder-in-stock/) powder, renowned for its versatility and reliability. But with the current surge in demand for reloading supplies, finding H4895 powder in stock can be a challenge. This article aims to shed light on everything you need to know about H4895 powder, its uses, benefits, and where you can find it.
What is H4895 Powder?
History and Development
H4895 powder is a product of Hodgdon Powder Company, a leading name in the reloading industry. Originally developed for military use during World War II, this powder has evolved over the years to become a favorite among civilian reloaders. Its formulation has been fine-tuned to offer consistent performance, making it a staple in many reloading benches.
Key Characteristics and Benefits
H4895 powder is a versatile, medium-burning rifle powder. It is known for its consistency, temperature stability, and ease of metering. These characteristics make it a preferred choice for reloaders who seek reliable performance across a variety of calibers and shooting disciplines.
Uses of H4895 Powder
Versatility in Different Calibers
One of the standout features of H4895 powder is its versatility. It can be used in a wide range of calibers, from .223 Remington to .308 Winchester, making it a go-to powder for many reloaders. Its ability to deliver consistent velocities and pressures across different loads is highly valued.
Performance in Competitive Shooting
For competitive shooters, the performance of their ammunition can make or break a match. H4895 powder is known for its excellent accuracy and consistency, making it a top choice for those competing in disciplines like benchrest, F-Class, and other precision shooting sports.
Application in Hunting
Hunters also benefit from the reliability of H4895 powder. Its temperature stability ensures consistent performance in various weather conditions, which is crucial for hunting. Whether you're in the freezing cold or sweltering heat, H4895 powder helps maintain the accuracy and effectiveness of your loads.
Why H4895 Powder is Popular
Consistency and Reliability
Reloaders trust H4895 powder because it delivers consistent results shot after shot. This reliability is crucial for both target shooters and hunters, who need to be confident in their ammunition's performance.
Temperature Stability
Temperature stability is a key factor in the performance of any powder. H4895 powder excels in this regard, maintaining consistent velocities and pressures even in extreme temperatures. This makes it a reliable choice for shooters who operate in diverse environments.
Ease of Metering
H4895 powder meters easily, which simplifies the reloading process. This characteristic is particularly beneficial for reloaders who value efficiency and precision in their reloading practices.
Availability of H4895 Powder
Current Market Trends
The demand for reloading supplies has surged in recent years, leading to periodic shortages. However, staying informed about market trends and knowing where to look can help you find H4895 powder in stock.
Finding H4895 Powder in Stock
Keeping an eye on reputable online retailers and local gun shops is essential. Many retailers offer notifications when popular items like H4895 powder are back in stock, so signing up for these alerts can give you an edge.
Tips for Purchasing
When you find H4895 powder in stock, consider buying in bulk to ensure you have an adequate supply. Also, be mindful of any purchase limits imposed by retailers to ensure fair distribution among customers.
Storage and Handling of H4895 Powder
Proper Storage Techniques
Proper storage of H4895 powder is crucial for maintaining its performance. Store it in a cool, dry place away from direct sunlight and moisture. Using airtight containers can help prevent contamination and degradation.
Safety Precautions
Always follow safety guidelines when handling H4895 powder. Keep it away from open flames and heat sources, and ensure you have proper ventilation in your reloading area. Wearing protective gear, such as safety glasses, is also recommended.
How to Reload with H4895 Powder
Step-by-Step Reloading Guide
Gather Your Equipment: Ensure you have all necessary reloading tools, including a reloading press, dies, scale, and H4895 powder.
Prepare Cases: Clean and inspect your brass cases, then resize and trim them as needed.
Prime Cases: Use a priming tool to seat new primers in the prepared cases.
Measure Powder: Carefully measure the appropriate charge of H4895 powder for your load.
Seat Bullets: Place bullets in the charged cases and seat them to the correct depth.
Inspect and Test: Inspect your completed rounds for any defects and conduct a few test shots to ensure performance.
Common Mistakes to Avoid
Overcharging: Always double-check your powder charges to avoid overloading, which can be dangerous.
Inconsistent Seating: Ensure bullets are seated to a uniform depth to maintain accuracy.
Skipping Inspections: Regularly inspect your reloading equipment and finished rounds to catch any issues early.
Comparing H4895 Powder to Other Powders
H4895 vs. Varget
H4895 and Varget are both popular choices, but they have distinct differences. Varget is known for its exceptional temperature stability and is often preferred for long-range precision shooting. H4895, while also stable, is celebrated for its versatility across a broader range of calibers.
H4895 vs. IMR 4895
IMR 4895 is another versatile powder, similar to H4895. However, H4895 is often chosen for its slightly better metering and consistency. Both powders offer excellent performance, but personal preference and specific application needs may dictate your choice.
Customer Reviews and Feedback
Positive Experiences
Many reloaders praise H4895 powder for its consistent performance and versatility. Users often highlight its reliability in various shooting disciplines and weather conditions.
Any Reported Issues
While generally well-received, some users have noted that H4895 powder can be challenging to find in stock due to high demand. This scarcity underscores the importance of staying vigilant and proactive in your search.
Where to Buy H4895 Powder
Online Retailers
Several reputable online retailers carry H4895 powder, including MidwayUSA, Brownells, and Powder Valley. Checking these sites regularly and signing up for stock notifications can help you secure your supply.
Local Gun Shops
Don't overlook local gun shops, as they often carry reloading supplies and may have H4895 powder in stock. Building a relationship with your local retailer can also provide insights into upcoming shipments.
Legislation and Regulations
Understanding Legal Requirements
Reloading supplies, including H4895 powder, are subject to various regulations. Familiarize yourself with federal, state, and local laws regarding the purchase, storage, and transportation of reloading components.
Compliance Tips
Ensure you comply with all legal requirements by purchasing from reputable retailers and following recommended storage and handling practices. Staying informed about any changes in legislation is also crucial.
H4895 powder is a standout choice for reloaders seeking versatility, consistency, and reliability. Whether you're a competitive shooter, a hunter, or simply enjoy the craft of reloading, H4895 powder offers exceptional performance across a wide range of applications. While finding it in stock can be challenging, staying informed and proactive will help you secure this valuable reloading component.
Contacts:
E-mail: brassproarmory@gmail.com
Phone: +12019030159 | brassproarmory | |
1,906,528 | HNG AND I | I’m so excited to be accepted into the HNG Internship. Still feels like yesterday where I was around... | 0 | 2024-06-30T11:00:05 | https://dev.to/johnpraise/hng-and-i-3bm9 | I’m so excited to be accepted into the HNG Internship. Still feels like yesterday where I was around my desk trying to place my hands around user authentication in Python/Django (backend), I made a lot of research in order to solve that problem which was a fluke in Django 5, it was quite a challenge for someone like me who is still new into tech. Thanks to HNG for giving me this opportunity.
https://hng.tech/hire
https://hng.tech/internship
| johnpraise | |
1,906,527 | DeviceBee is Top Mobile App Development Company Dubai | Leading Mobile App Development Company in Dubai — DeviceBee DeviceBee is leading mobile app... | 0 | 2024-06-30T10:59:35 | https://dev.to/devicebeetechnologies/devicebee-is-top-mobile-app-development-company-dubai-4m9p | devicebee, appdevelopmentdubai, mobileappdeveloperdubai, bestappdevelopmentdubaiuae | **Leading Mobile App Development Company in Dubai — DeviceBee**
DeviceBee is [leading mobile app development company in the UAE](https://www.devicebee.com/mobile-app-development-company-in-the-uae/). Renowned for our expertise in iOS app, android app, hybrid, cross-platform & native , artificial intelligence, on-demand apps, custom apps, and web development, [DeviceBee is #1 App Development Company in Dubai ](https://www.devicebee.com)
DeviceBee stands out as a [premier Mobile App Development Company](https://www.devicebee.com/mobile-app-development-company-in-dubai/) in Dubai, UAE, committed to delivering top-notch solutions. Collaborating with mid-size businesses, entrepreneurs, startups, and business founders, we specialize in crafting custom [mobile apps development](https://www.devicebee.com/mobile-app-development/) to various industry verticals. Drawing from our extensive experience and in-depth knowledge of local market dynamics, we’re adept at providing the perfect mobile app solutions that align with your resources and objectives. Trust DeviceBee to create the ideal mobile apps for your company, empowering you to thrive in today’s fiercely competitive industry landscape.
Let’s build your next-gen app together — cost-effective, high-tech, and tailored to perfection! Reach out today and let’s make it happen.
**Get in touch with our expert to get a free consultation now!
**Email at [info@devicebee.com](info@devicebee.com)
Visit: [https://www.devicebee.com](https://www.devicebee.com) | devicebeetechnologies |
1,906,448 | React + Vite + Tailwind project | If you want to create a React project without using framework like NextJS or Remix, this article is... | 0 | 2024-06-30T10:48:10 | https://dev.to/thinhkhang97/react-vite-tailwind-project-57pf | webdev, react, vite, tailwindcss | If you want to create a React project without using framework like NextJS or Remix, this article is for you. In this guide I will help you init a `React` project with `Vite` and use `TailwindCss`.
## Prerequisite
* NodeJS version >= 18
Use this command to check your NodeJS version
```bash
node -v
```
## Create react project with vite
Open your terminal and run the command
```bash
npm create vite@latest
```
It would ask you some question:
* Project name: Your project name, example: pokemon
* Select a framework: Choose React
* Select a variant: Pick TypeScript
Then your project is created, open the project by VSCode or your other IDE and install dependencies by this command:
```bash
npm install
```
To run project in dev mode, run
```bash
npm run dev
```
The project would be run at http://localhost:5174
## Integrate with Tailwind
Install Tailwind by command
```bash
npm install -D tailwindcss postcss autoprefixer
```
Then init Tailwind config file
```bash
npx tailwindcss init -p
```
Update file `tailwind.config.js` following this code
```json
content: [
"./index.html",
"./src/**/*.{js,ts,jsx,tsx}",
],
```
Open `index.css` file import all tailwind css styles
```css
@tailwind base;
@tailwind components;
@tailwind utilities;
```
Now let's test your Tailwind with this code in any `.tsx` file
```tsx
<h1 className="text-3xl font-bold underline">
Hello world!
</h1>
```
If the styles are applied, you successfully initialized a React project with Tailwind and Vite.
| thinhkhang97 |
1,906,523 | Your Weekly Dive into Programming, Web3, and Open-Source Tools | Hello friends, Read directly on website Welcome to this week newsletter. Without wasting much time... | 0 | 2024-06-30T10:41:21 | https://dev.to/shreyvijayvargiya/your-weekly-dive-into-programming-web3-and-open-source-tools-28pb | webdev, javascript, news, programming | Hello friends,
[Read directly on website](ihatereading.in/newsletter)
Welcome to this week newsletter. Without wasting much time let's dive into what's going on this week in programming, tech, and web3.
## ✍️ Blogs
[Trending in React](https://x.com/sebastienlorber/status/1805866982798950684)
Well, what's trending this week in Reactjs is summed up in this tweet. Changes in React Router, React Native RC, Reactjs and much more are discussed along with some good reads.
[New JS set method](https://developer.mozilla.org/en-US/blog/javascript-set-methods/)
Here we go with new JS set method. This article is a good read for people who are new to Set in JavaScript and are looking to find out how to use these new JavaScript methods. I'll highlight some advantages of using these methods with basic examples to show why you might reach for these instead of building your own implementations.
[Introduction to Rust](https://stevedonovan.github.io/rust-gentle-intro/1-basics.html)
Javascript or Python developers this blog is a online free course to get started easily with Rust programming language.
[LinkedIn Authorising 10 million requests](https://newsletter.systemdesigncodex.com/p/how-linkedin-authorizes-10-million)
Managing access control at scale, How LinkedIn manages 10 million requests is discussed in this blog
[Validating Forms using Yup and Formik](https://www.freecodecamp.org/news/react-how-to-validate-user-input/?ref=dailydev)
Form validation are often quite useful and required things in frontend and backend. Validating user name and email using regex is no longer the only needed step we need further validation and yup and formik helps to create that validations easily
[https://changelog.com/jsparty/](https://changelog.com/jsparty/)
The JS party podcast is discussing react-native and Expo in detail in a podcast. I mean I haven't found the Expo and react-native podcast for so long and I am glad to listen it.
[React Native Youtube Channel](https://www.youtube.com/@wcandillon)
I am a big fan of William and watching his work and video for the past few years. William works on react-native and expo and builds animation and all kinds of mobile apps his work is just outstanding and inspiring so one must give it a shot.
[Inline If() condition in CSS](https://lea.verou.me/blog/2024/css-conditionals/)
Lea shared a blog about inline conditionals or if conditions in CSS. In the blog he shared what will change, how to use these if condition as well how it will bring consistency in the CSS code apart from those style queries variables.
[Managing Stolen Session Cookies in Slack](https://slack.engineering/catching-compromised-cookies/)
In client-side authentication or frontend react app developers use session cookies to authenticate and manage the user session and slack did the same for their app but it comes with a lot of security concerns. One big concern is stealing the session cookies and reusing them for further sessions by attackers and in this blog the engineering slack team have discussed how they are protecting slack
[AI based CSS animation](https://www.aicssanimations.com/)
AI based animation that takes user inputs for what kind of animation and show the animation along with CSS properties of the respective animation and all is done using AI.
[Everything about Git](https://frontendmasters.com/courses/everything-git/)
New frontend masters course on everything about git is live. Frontend masters is quite loved learning platform by lot of javsacript devs and frontend developers.
## 🛠️ Open-Source & Tools
[Twilio: Send Notification Easily](https://www.twilio.com/docs)
Twilio is widely used notification service in backend. Twilio helps developers to establish the notification services between the applications server side and client side and types of communications twilio provide is push notification, SMS, OPT, Email and so on. Check Twilio docs to get started easily.
[Fuzzy Map](https://www.fuzzmap.io/)
This tool converts react code into a fuzzy map or a tree that automatically identifies states using code coverage and builds a visual map. Ideally, the map is useful even to people who'd prefer not to read code.
[Gulp: Automate any boring javascript tasks](https://gulpjs.com/docs/en/getting-started/quick-start)
Gulp.js is an opens-source module that basically helps to automate any javascript boring tasks by creating pipelines.
9 javascript testing libraries
Writing test cases is frontend or in javascript is not quite touched topic by lot of bloggers so here is the list of open-source 9 testing libraries.
* [Jest](https://github.com/facebook/jest)
* [Testing Library](https://testing-library.com/)
* [Nightwatch JS](https://github.com/nightwatchjs/nightwatch)
* [Cypress](https://github.com/cypress-io/cypress)
* [Mocha](https://github.com/mochajs/mocha)
* [Playwright](https://github.com/microsoft/playwright)
* [Selenium](https://github.com/SeleniumHQ/selenium)
[Pytorch](https://pytorch.org/)
Open-source python library for machine learning developers. PyTorch is a machine learning library based on the Torch library, used for applications such as computer vision and natural language processing
[Kaplay JS](https://kaplayjs.com/)
Javascript library for making games, here is the [playground](https://play.kaplayjs.com/) as well.
[Numpy](https://numpy.org/): [Just release version2](https://numpy.org/)
Another python most loved and open-source library to deal with quantum computing, statistics computing, chemistry, mathematical analytics, graphs and networks and signalling and lot more and that clearly says a lot why this is the most loved libraries in python.
## Web3 domain
We will cover vast and variety of domains in this newsletter to cater larger audiences of all domains.
[2024 need more blockchain devs](https://nader.substack.com/)
Nadar Dabbit shared his view of number of developers in 2024 in web3 domain and his view is suprisingly opposite to what we all expect, 2024 is termed as bearish market because more layoffs and less hiring. But Nadar opinion is quite opposite to it.
[React Native AI](https://nader.substack.com/p/introducing-react-native-ai)
React Native AI is a full stack framework for building cross-platform mobile AI apps.
[Find Web3 Jobs](https://cryptojobslist.com/)
Crypto Jobs list is quite a useful platform to grab your first or next web3 jobs, give it a shot and my opinion is to filter the companies list and extract the personal or HR email from the website to send direct or cold email to increase your chances of getting hired.
[Thirdweb](https://thirdweb.com/)
Full-stack open-source web development platform for web3 domain, thirdweb is a frontend, backend, and onchain tools to build complete web3 apps — on every EVM chain.
## Currently Reading
I am currently reading this book [12 Week in a Year](https://www.amazon.in/12-Week-Year-Others-Months/dp/1118509234), that helps me to set the target for 12 weeks instead of 12 months and this simple strategy changes a lot in terms of accomplishing targets.
That's it for today, see you on the next friday
Shrey | shreyvijayvargiya |
1,906,522 | Backend Development from my view - a little story. | As a front-end developer interested in learning how both ends of an application works, I gave backend... | 0 | 2024-06-30T10:34:14 | https://dev.to/jprof/backend-development-from-my-view-a-little-story-gfn | As a front-end developer interested in learning how both ends of an application works, I gave backend development some of my attention.
It was easier to understand what I was reading as I could understand backend development in my language—Javascript.
There are little differences though:
Browser? No. Node? Yes
CSS? Nope
HTML? Nope
React? Nope.
I had to work with new guys, basically:
Express
Nodejs
MySQL
I had some knowledge of what happened in the backend world theoretically, I'd written some codes too, even created my own APIs and connected it to my frontend on a learning project. I had experienced the "brain change"—I can't be the only one to have experienced this—similar to when our eyes adjust to a much brighter room or to a more dimmer room. In the process of shuffling between frontend and backend, I've had to pause for some seconds to adjust to the "brighter light"—squinting a bit— if I'm switching to front end. I think I prefer backend to frontend but let's see.
Then I had a project to apply what I've learnt, use the knowledge of what I'd learnt to build this 👇
Say someone is in danger or in an accident scene,This is the flow:
* Once the person opens the application,it picks up the person's location
* The individual can send a message in audio format and it will transcribe the message from audio to text and
* Send that message to any phone number of choice.
Basically, it's a small full-stack app. Full-stack because there is the front-end—though minimal—for users to interact with the app.
The tools I used and what they helped me with:
Node - where it all happened, my environment
Express.js - with the help of this guy, I create endpoints
Twilio - this guy helped in sending the messages to whatever phone number I specified.
While building, I had a little issue integrating Twilio. But I went over the documentation again and followed it closely.
I haven't hosted it yet,but when I do I'll follow it up with another article that explains it from start to finish.
**HNG11**
It's an opportunity to be a part of this internship,whether you're a beginner or you're familiar with what's going on, you're certain to grow. To grow with like minds, gain connections and share what I know with others will be a "mission accomplished" for me at HNG.
I'm eager to improve my backend skills and learn more during this internship. If you're interested in joining this cohort,the best time to join is right now. 👇
https://hng.tech/internship
If you're interested in looking for elite freelance talent,you need one link 👇
https://hng.tech/hire
I'm Ogbonnaya Johnson, a front-end developer with a scoop of backend development.
| jprof | |
1,906,520 | React vs. Angular: A Comprehensive Comparison | Hi, I am Patricia Nonye, a Frontend Developer with 2+ years experience, on an exciting journey with... | 0 | 2024-06-30T10:29:33 | https://dev.to/tinkerrbelle/react-vs-angular-a-comprehensive-comparison-4cbl | beginners, hng, blog, frontend | Hi, I am Patricia Nonye, a Frontend Developer with 2+ years experience, on an exciting journey with HNG internship. This internship is a unique opportunity to refine my skills, face real-world challenges, contribute with like-minded individuals.
At HNG, we primarily use ReactJS which I enjoy using because of its flexibility, performance and its large community and extensive resources available.
In this blog post, we'll compare React and Angular, highlighting their pros and cons. Choosing the right JavaScript framework for your project is crucial for its success. Among the most popular frameworks today are React and Angular. Both have their strengths and weaknesses, and understanding these can help you make an informed decision.
**Introduction to React and Angular**
**What is React?**
React is an open-source JavaScript library developed by Facebook for building user interfaces, particularly for single-page applications. It's component-based, allowing developers to create reusable UI components.
**What is Angular?**
Angular is a comprehensive open-source framework developed by Google. It's designed for building dynamic web applications and offers a complete solution with features like two-way data binding, dependency injection, and more.
**Key Differences Between React and Angular**
**Architecture**
**React**: React is a library focused on building UI components. It relies on external libraries for state management (e.g., Redux) and routing (e.g., React Router).
**Angular**: Angular is a full-fledged framework that provides a complete solution out of the box, including routing, state management, and form validation.
**Learning Curve**
**React**: React has a smaller API surface, making it easier to learn. However, developers need to learn additional libraries for state management and routing.
**Angular**: Angular has a steeper learning curve due to its comprehensive nature and the use of TypeScript, which is a statically typed language.
**Performance**
**React**: React uses a virtual DOM to optimize updates, which can lead to better performance in complex applications.
**Angular**: Angular uses real DOM, but with change detection and zones, it optimizes performance effectively.
**Flexibility**
**React**: React is more flexible as it allows developers to choose their own libraries for routing, state management, etc.
**Angular**: Angular is more opinionated and comes with a set way of doing things, which can be beneficial for consistency but less flexible.
**Pros and Cons of React**
**Pros**
**Ease of Learning**: React's simplicity and smaller API surface make it easier for new developers to pick up.
**Performance**: The virtual DOM ensures efficient updates and renders, improving performance in complex applications.
**Flexibility**: Developers can choose their own libraries for routing, state management, etc., making it highly customizable.
**Strong Community Support**: Backed by Facebook, React has a large and active community, providing abundant resources and third-party libraries.
**Cons**
**Dependency Management**: Since React is just a library, you'll need to manage dependencies for routing, state management, etc.
**Boilerplate Code**: Setting up a React project can require more boilerplate code due to the need to integrate various libraries.
**Frequent Updates**: React's ecosystem evolves quickly, which can sometimes lead to breaking changes and the need for frequent updates.
**Pros and Cons of Angular**
**Pros**
**Comprehensive Framework**: Angular provides a complete solution out of the box, including routing, state management, form validation, and more.
**Two-Way Data Binding**: This feature simplifies the process of synchronizing the model and the view.
**Dependency Injection**: Angular's built-in dependency injection improves code modularity and testability.
**Robust Tooling**: Angular CLI offers powerful tools for scaffolding, building, and maintaining Angular applications.
Cons
**Steeper Learning Curve**: Angular's comprehensive nature and the use of TypeScript make it more challenging to learn.
**Performance Overhead**: While Angular optimizes performance, the real DOM manipulation can still lead to performance issues in very complex applications.
**Opinionated Structure**: Angular's opinionated nature can limit flexibility, making it harder to integrate with non-Angular libraries.
**Conclusion**
Both React and Angular are powerful tools for building web applications, each with its own strengths and weaknesses. React offers flexibility and ease of learning, making it a great choice for projects that require customization and scalability. Angular, on the other hand, provides a comprehensive solution with a strong structure, making it ideal for large-scale applications that benefit from a more opinionated framework.
Ultimately, the choice between React and Angular depends on your project's requirements, your team's expertise, and your personal preferences. By understanding the key differences, pros, and cons, you can make an informed decision that best suits your needs.
If you're interested in learning more about the program, check out the
https://hng.tech/internship and
https://hng.tech/hire
| tinkerrbelle |
1,906,519 | Creating and Managing IAM users from Your EC2 instance | Introduction Creating and managing IAM users from an EC2 instance involves a few steps to ensure... | 0 | 2024-06-30T10:27:11 | https://dev.to/rashmitha_v_d0cfc20ba7152/creating-and-managing-iam-users-from-your-ec2-instance-4a6l | **Introduction**
Creating and managing IAM users from an EC2 instance involves a few steps to ensure proper security and access control. Here’s a general guide on how to accomplish this:
**Step 1:**
Create a EC2 instance.
**step 2:**
Connect to your EC2 instance using SSH.
open your terminal and run the following command
`ssh -i path_to_your_key.pem ec2-user@your_ec2_public_dns`
**step 3:**
create a new user
once connected to your EC2 instance, you can create a new user.
Use this command,replace new_username with the desired username:
`sudo adduser new_username`
**Step 4:**
set a password for the new user.
use the following code:
`sudo passwd new_username`
**step 5:**
verify the new user.
To verify that the user has been created successfully, use this command:
`cat /etc/passwd`
In conclusion, managing IAM users from your EC2 instance involves leveraging the AWS CLI and adhering to best practices for security and access control.
| rashmitha_v_d0cfc20ba7152 | |
1,906,518 | Coding an Arduino snake game using a TFT LCD screen | I want show you how I implemented the classic snake game in Arduino using a 2.8 inch TFT screen and a... | 0 | 2024-06-30T10:25:41 | https://kozmicluis.pro/blog/arduino-snake/ | gamedev, cpp, arduino, programming | I want show you how I implemented the classic snake game in Arduino using a 2.8 inch TFT screen and a random joystick that came inside my ELEGOO Arduino Mega learning kit that I got from Amazon many years ago for an university project.
## The final product - [🔗 Github Repo](https://github.com/luishendrix92/arduino-snake)
In the short video above you can see what it looks like once it's finished. It's just a screen that displays 3 things: the background, the snake's head and its body, and a randomly spawned blue apple.
On the right, connected to 2 analog pins, a 5V pin, and a GND pin, is the joystick I decided to use to move the snake around in 4 directions (up, down, left, and right); yes I know you can't see it but it's there, trust!
## Table of Contents
* [Assumptions and requirements](#assumptions-and-requirements)
* [Testing the TFT LCD screen](#testing-the-tft-lcd-screen)
* [Writing some code, finally!](#writing-some-code-finally)
* [A header file just for constants](#a-header-file-just-for-constants)
* [Planning the `Snake` class](#planning-the-snake-class)
* [Minimal implementation of the Snake class](#minimal-implementation-of-the-snake-class)
* [Uploading the first iteration](#uploading-the-first-iteration)
* [Leaving a trail...](#leaving-a-trail)
* [Changes we need to make](#changes-we-need-to-make)
* [Uploading iteration #2](#uploading-iteration-2)
* [Finishing the game's mechanics](#finishing-the-games-mechanics)
* [What about spawning apples on top of the snake?](#what-about-spawning-apples-on-top-of-the-snake)
* [Connecting the joystick](#connecting-the-joystick)
* [Uploading iteration #3 (final)](#uploading-iteration-3-final)
* [Final remarks](#final-remarks)
---
## Assumptions and requirements
If it wasn't obvious enough, you'll need:
1. An **Arduino board** with enough pins to connect the display and the joystick. You can get them anywhere (Amazon, ebay, your local electronics store) from like 15-20 dollars to 40-50 USD.
2. A [**TFT LCD screen**](https://www.amazon.com/tft-display/s?k=tft+display), preferably one that comes as a shield you can just mount on top of the board so you don't have to whip out your breadboard and a bunch of cables. Popular brands are Adafruit, and ELEGOO; both come with a CD that contains libraries and examples (which you can also download online).
3. A **joystick component**, or if you can't find one, 4 buttons (one for each direction), which are really easy to set up and code. And if neither are an option for you, you could research how to use the screen's touch feature to create your own virtual joypad.
I am also making some assumptions about what you already know:
1. I assume already how to [plug](https://www.arduino.cc/en/Guide/ArduinoUno/) the board to your PC and that you have an IDE installed. You most likely have the official [Arduino IDE](https://docs.arduino.cc/software/ide-v2/tutorials/getting-started-ide-v2/), or maybe prefer using PlatformIO (I'm using CLion with the PlatformIO plugin) with [VSCode](https://maker.pro/arduino/tutorial/how-to-use-platformio-in-visual-studio-code-to-program-arduino).
2. I also assume you are not new to the C++ language, but it's not completely necessary to know a big deal about it, because I'm also kind of a beginner myself. If you are good at it and you find stuff in my code that rubs you the wrong way, hit me up (@kozmicluis on X/Twitter).
3. I will not go into full detail about every possible implementation of the game, mechanic, or historical fact because I'm writing an article soon. Once I finish it I'll replace this paragraph with a link to it.
## Testing the TFT LCD screen
Here's a picture of how I have the TFT shield connected:
To connect the shield to the board just line up the corresponding pins. You can read on the back that on one row you have 5V, GND, and some analog pins; while on the other side's row you have a few digital pins, some of which are used for the SD card reader and the touch screen (which won't be used for this project).
If you do prefer using a breadboard (or if your screen can't be used as a shield), refer to the screen's manual or maybe [this wiring tutorial](https://learn.adafruit.com/2-8-tft-touchscreen/tft-wiring). Additionally, you need to make the libraries available in your project! The ones we need are the GFX library, and TFT-LCD library which contains all the "pin magic", a bunch of examples, and a class that we can instantiate to interact with the underlying rendering functions.
The ELEGOO screen came with a CD containing all the PDFs and library zips I needed to get started, but you can also do a quick google search for Github repositories that might have them for download (such as [this repository](https://github.com/DavidLeithauser/Elegoo_2.8inch_Arduino_TFT_Touch_SCREEN_CD_Contents) with the CD's contents). Once I dragged the library folders into my project's dedicated folder (for PlatformIO projects, it's the `/lib` subdirectory), I created the following files: `/include/Snake.h`, `/include/constants.h`, and `/src/Snake.cpp`, which will be explained later.
Here's how my project structure looks like:
```
.
├── include
│ ├── constants.h
│ └── Snake.h
├── lib
│ ├── Elegoo_GFX
│ │ └── <library files>
│ └── Elegoo_TFTLCD
│ └── <library files>
├── platformio.ini
├── src
│ ├── main.cpp
│ └── Snake.cpp
└── test
└── <test files>
```
### Writing some code, finally!
Plug the board with the screen already connected, and *upload* your project once you modify your `/src/main.cpp` script to make an instance of the TFT class, and calling a bunch of initialization functions.
```cpp
#include <Arduino.h>
#include <Elegoo_TFTLCD.h>
Elegoo_TFTLCD tft(A3, A2, A1, A0, A4);
void setup() {
Serial.begin(9600);
tft.reset();
tft.begin(0x9341);
tft.setRotation(3); // Landscape
tft.fillScreen(0x0000);
tft.fillRect(50, 50, 100, 100, 0xFFFF);
}
void loop() {
}
```
The first thing to do is create an instance of the library class. If you are using a different screen, the library folder and the class might have a different name and implementation; for example, it could be `Adafruit_TFTLCD` instead. Most 2.8 screens out there use the [IL9341](http://www.lcdwiki.com/2.4inch_SPI_Module_ILI9341_SKU:MSP2402) driver, that's why the graphics example file in the library folder that came with my CD had the `tft.begin(0x9341);` line hardcoded somewhere, but it could be different in your example file, and to be honest it took me a long time to make my screen work with a different library until I just decided to just copy the example file, learn from it and then delete everything but the initialization calls (`tft.reset()`, `tft.begin()`).
Once you run this code, you should see a black background with a white square (100x100 pixels in size) at the position `(x = 20, y = 20)`. Bear in mind these screens have a <mark>resolution of 320x240</mark> pixels. If all you see is a white background, you are probably using the wrong library/driver, connected the pins in the wrong holes, or didn't pass the right pin numbers to the library constructor.
Lastly, the number `3` I provided as argument to the `orientation` setter corresponds to landscape mode (left-to-right), but you can try others from 0 to 2 (0 and 2 being portrait).
### A header file just for constants
It is good practise to have all the constants in a file that can be accessed from anywhere in the project, and what better way to have them in a header file inside our `/include` directory! Also, it is advised to avoid `#define` as much as possible and use instead static constants. Start by creating a file called `constants.h` in the includes folder:
```cpp
#ifndef CONSTANTS_H
#define CONSTANTS_H
/* ILI9341 | a-Si TFT LCD Single Chip Driver
* 240RGBx320 Resolution and 262K color
* https://cdn-shop.adafruit.com/datasheets/ILI9341.pdf */
constexpr uint16_t TFT_DRIVER_ID = 0x9341;
constexpr uint8_t BOARD_HEIGHT = 24;
constexpr uint8_t BOARD_WIDTH = 32;
constexpr uint8_t BLOCK_SIZE = 10;
constexpr uint8_t INTERVAL = 100;
constexpr uint16_t BLACK = 0x0000;
constexpr uint16_t BLUE = 0x001F;
constexpr uint16_t WHITE = 0xFFFF;
constexpr uint8_t JOYSTICK_PIN_X = 15;
constexpr uint8_t JOYSTICK_PIN_Y = 14;
constexpr uint16_t JOYSTICK_THRESHOLD = 300;
#endif // CONSTANTS_H
```
We already know what the driver ID constant is for, so, please replace the hardcoded value in `main.cpp` with the constant and let your IDE automatically insert a `#include "constants.h"` line at the very top. The other constants will eventually make sense but for now all you need to know is that our snake will have a block size of 10x10 pixels, therefore, our relative board width and height is 32x24 *blocks*.
## Planning the `Snake` class
For this particular implementation I decided to create a class that defined the behaviour of a snake entity that consists of 3 main components: the head, its body (not including the head), and the tail (the last element of the body); without forgetting the random position of the apple to eat next. This snake will also have a direction that will be changed every *tick* (at a given interval) by the joystick, and this direction dictates how the head moves inside the board (up, right, down, or left).
Let's start by creating the `include/Snake.h` file:
```cpp
#ifndef SNAKE_H
#define SNAKE_H
#include "../../../.platformio/packages/toolchain-atmelavr/avr/include/stdint.h"
#include "constants.h"
enum Direction : uint8_t { NONE = 0, UP, RIGHT, DOWN, LEFT };
struct Vec2 {
int8_t x;
int8_t y;
void operator+=(const Direction dir) {
if (dir == RIGHT) x += 1;
else if (dir == LEFT) x -= 1;
else if (dir == UP) y -= 1;
else if (dir == DOWN) y += 1;
}
};
class Snake {
public:
Vec2 apple_;
Vec2 head_;
explicit Snake() : dir_(), head_(), tail_(), apple_() {}
void changeDir(Direction dir);
void move();
void reset();
private:
Direction body_[BOARD_HEIGHT][BOARD_WIDTH]{};
Direction dir_;
Vec2 tail_;
void spawnApple();
bool wallCollision() const;
bool selfCollision() const;
};
#endif // SNAKE_H
```
I will try to explain part by part, starting with the first include (yes, that extra long line above `#include "constants.h"`). The reason it exists is because I'm using PlatformIO and `stdint.h`, the file where `uint8_t`, `uint16_t` (and their unsigned version) are defined, resides at that location (CLion auto inserted it). However, and it might be different if you're using the Arduino IDE.
What's with `uint_8` and its buddies? Well, as you may know, Arduino boards (and relatives) have limited memory, thus it's wise to use 8 bit integers for values no greater than 127 (signed 8 bit integers, or bytes), or 255 (unsigned bytes). It's worth noting that the Arduino library has a `byte` type but I prefer using `uint8_t` and `int8_t` for cross-compatibility.
Now, the `Direction` enum defines 4 possible directions a snake can turn to, and `NONE` which has a value of `0` and is used as a null value for the body part 2d array called `body_`. If a cell in the `body_` grid has a direction value of `NONE`, it means there is no snake body part in there, and I use these values in a onditional that checks for head-to-body self-collision. It can also be used to improve the `spawnApple()` method so that it doesn't spawn apples if the corresponding grid coordinate has a snake body part in it (something I chose not to do ~~because I was lazy~~ for simplicity sake).
Next is the `struct Vec2` definition, which is a very idiomatic "C-like" way of representing a 2D coordinate. Both `x` and `y` members are of type `int8_t` because neither will be greater than 127 or less than -127, but if my board size were bigger than 127x127, then I'd have to define them as `int16_t` or just `int` if they are 16 bits and not bigger. Inside the struct I chose to [overload](https://www.tutorialspoint.com/cplusplus/cpp_overloading.htm) the `+=` operator so that I can add a direction to a point like this:
```cpp
Vec2 position = { .x = 5, .y = 3 };
position += DOWN; // [position]'s [y] member was mutated
printf("Position(x = %i, y = %i)\n", position.x, position.y);
// Position(x = 5, y = 4)
```
Last, we have the class definition with, initially, 3 public methods, and 3 private methods, all 6 very self-explanatory:
| Method/Member | Visibility | Purpose |
|--------------------|------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `Snake()` | Public | Default constructor that initializes all members. |
| `changeDir()` | Public | Sets the direction of the snake while preventing it from turning 180° (would cause self-collision). |
| `move()` | Public | Where most of the mechanics' code goes, it's responsible for moving the head, updating the body grid, the tail, and checking for collisions. |
| `spawnApple()` | Private | Finds a random position inside the grid for the first or next apple. It is called upon game reset and when the snake eats the previous apple. |
| `wallCollision()` | Private | Returns `true` if the updated position of the snake's head is out of bounds, meaning, it collided against a wall. |
| `selfCollision() ` | Private | The second losing condition; returns `true` if the updated position of the snake's head is occupied by a body part (including the tail). |
| `reset()` | Public | Resets the members to their initial values. It's called at the start of the program and whenever a losing condition (collision) is met. |
| `body_` | Private | A statically allocated 2D array of 24 rows and 32 columns. Represents all the cells in the board grid and whether or not (direction is `NONE` or greater than) a snake body part (represented as a direction) exists in those `x, y` positions. It's basically a lookup table that makes collision detection and tail-updating as time-efficient as it gets at the cost of some memory. In our case, 32x24 bytes (around 37.55% of the 2KB available *SRAM* in the Arduino UNO). |
| `dir_` | Private | The current direction of the snake's head. **Initial Value**: `RIGHT`. |
| `head_` | Public | The current position of the snake's head (not included in the body grid), possibily the most relevant member as it's used a lot by the game's mechanics. **Initial Value**: Half the width of the board (for `x`), and half the height (for `y`). |
| `tail_` | Private | The current position of the snake's tail (included in the body grid), it's updated every time the snake moves unless an apple is eaten. **Initial Value**: The same as the head, at least until the snake eats an apple. |
| `apple_` | Public | The position of the current apple, it changes at random whenever it's time to spawn a new apple. **Initial value**: It's chosen at runtime after a call to `reset()`, and therefore, to `spawnApple()`. |
## Minimal implementation of the Snake class
We're very close to uploading the first iteration of our snake game, one that displays the head moving from its starting position all the way to the right wall (I chose `RIGHT` as my starting direction, but you choose yours :>), then colliding and resetting again and again.
For this, we need to have a minimum working implementation of 4 very important methods in the `Snake` class: `move()`, `spawnApple()`, `wallCollision()`, and `reset()`. First let's implement `reset()`, which will be called both inside Arduino's `setup()` function, and inside `move()` whenever it encounters a *losing condition* (collision, in our case).
Here are the first lines of code of our `src/Snake.cpp` file:
```cpp
#include "Snake.h"
#include <Arduino.h>
void Snake::reset() {
for (auto &row : body_)
for (auto &cell : row)
cell = NONE;
dir_ = RIGHT;
head_.x = BOARD_WIDTH / 2;
head_.y = BOARD_HEIGHT / 2;
tail_.x = head_.x;
tail_.y = head_.y;
spawnApple();
}
```
This method will fill all the grid cells with `NONE`, symbolizing the non-existance of body parts (the head isn't included). Then, it sets the initial values I wrote about in the previous table, and finally, a call to `spawnApple()` is made so that we have an apple at the start.
Now let's implement the minimum working `move()` method right below `reset()`:
```cpp
// ... src/Snake.cpp
void Snake::move() {
head_ += dir_;
if (wallCollision()) {
reset();
}
}
```
The `move()` method will be about 4 times bigger at the end but for now this code is all we need to see the snake's head move automatically and then reset its position when it collides with the right wall. Finally, let's implement the remaining 2 methods that won't change much in later steps:
```cpp
// ... src/Snake.cpp
void Snake::spawnApple() {
apple_.x = static_cast<int8_t>(random(BOARD_WIDTH));
apple_.y = static_cast<int8_t>(random(BOARD_HEIGHT));
}
bool Snake::wallCollision() const {
return head_.x >= BOARD_WIDTH ||
head_.x < 0 ||
head_.y >= BOARD_HEIGHT ||
head_.y < 0;
}
```
For now that's all there is to the class implementation. A few things to note are, first, we need to cast the return type of `random()` to a `int8_t` which is something your IDE will most likely suggest. Additionally, if you're wondering why there's a `const` after the method name in `wallCollision()`, it's because I was taught to mark methods that don't mutate the state of a class/struct as `const`; I think it all helps to prvent you from shooting yourself in the foot with accidental mutations, and it may help the compiler make optimizations.
## Uploading the first iteration
First, we need to update the `src/main.cpp` sketch script to make sure the head is moved every few milliseconds (as defined by the `INTERVAL` constant) and to initialize the seed of the random number generator.
```cpp
#include <Arduino.h>
#include <Elegoo_TFTLCD.h>
#include <Snake.h>
#include <constants.h>
Elegoo_TFTLCD tft(A3, A2, A1, A0, A4);
Snake snake;
void drawBlock(int8_t x, int8_t y, uint16_t color) {
tft.fillRect(x * BLOCK_SIZE, y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, color);
}
void setup() {
Serial.begin(9600);
randomSeed(analogRead(A6));
tft.reset();
tft.begin(TFT_DRIVER_ID);
tft.setRotation(3); // Landscape
tft.fillScreen(BLACK);
snake.reset();
}
void loop() {
snake.move();
drawBlock(snake.head.x, snake.head.y, WHITE);
drawBlock(snake.apple.x, snake.apple.y, BLUE);
delay(INTERVAL);
}
```
In the global scope we instantiate the `Snake` class, then inside the `setup()` function we add a seed initializer `randomSeed(analogRead(A6))` that uses a random unconnected analog pin's value (as the documentation suggests), or the current time. The goal to make the seed different every time the board's code is processed at startup.
I also defined a helper function called `drawBlock()` that prevents me from writing the `BLOCK_SIZE` constant every time I want to render a block. Finally, at the end of the `setup()` function is a call to `reset()` so that the initial values of the snake's state are properly set.
Inside the loop, we first move the snake's head and then wait for a few milliseconds before moving it again. I chose adelay of 100 milliseconds because it just feels right and not so fast, while also not being painfully slow. Could I have implemented the interval in terms of the difference in time between the last tick and the current timestamp? Yes, but I didn't want to overcomplicate things, plus I can just tell you at the end of the tutorial how you'd achieve such thing... I learned it while playing around with the Löve2D Lua library.
It's time to upload the sketch! It should now display a white square going from the center of the screen to the right in a loop, and a blue square (the apple) appearing in random positions every time the snake collides with the wall.
## Leaving a trail...
You may have noticed already that I kinda lied to you! Sure the white square (snake's head) moved to the right, and blue squares (apples) appeared at random, but also, the previous apple wasn't *removed* from the screen, nor was the space occupied by the previous head. Why? Because naturally, we need to manually refresh all the entities, including the background to give the illusion of motion, otherwise it'd just look like everything is leaving a trail or is placed on top of existing things.
There is just one problem... <mark>your (and my) TFT LCD screen probably takes a painful half a second to paint the entire screen pixel by pixel</mark>, and making a call to `tft.fillScreen(BLACK)` every time `loop()` is called requires our `INTERVAL` to be more than 600ms for repaints to be viable. But we want our game to run as fast as 30 FPS or as slow as 5FPS, not almost every second; so how do we achieve that?
Easy! For starters, every time we need to *remove* the tail when a snake moves without eating an apple, <mark>we draw a black square (or the same color as your background of choice) on top of the *old tail*</mark>. We also need to do the same with apples, we draw a black square on top of the *old apple* every time a new one has to spawn, but **only if it's not the first time an apple spawns**, so we'd have to let the code know somehow whether it's the first time the apple spawns or not. When is it the first time an apple spawns? When we call `reset()`, and every time after that (calls to `move()`), isn't.
## Changes we need to make
First of all, I want to make the snake as unaware of the outside world as possible. I don't want to mix Snake logic with rendering function (shouldn't have to change the code if I decide to use SDL2, or Raylib, or the console) calls, or how intervals are calculated, or how we determine the direction of the snake (shouldn't know if I use a joystick, or the keyboard, or buttons, or if it's done programatically).
In order to achieve that while also accounting for the fact that I can't just naively repaint the background and entities, I decided to implement event handlers to let the *outside world* subscribe to 3 events: `reset`, successful `move` (failure causes `reset` to be triggered instead), and `appleSpawn`. This way we can subscribe to those events inside the `setup()` function and write rendering logic inside their corresponding handlers.
**Note**: This would not be necessary if the repaint speed wasn't so slow, I could just add getters for `body_`, `head_`, and `tail_` and have a `draw()` function access them, running inside `loop()` every X times per second.
Let's begin changing the code, starting with a modified version
of `include/Snake.h`:
```cpp
// ...
class Snake {
public:
explicit Snake() : dir_(), head_(), tail_(), apple_() {}
void changeDir(Direction dir);
void onReset(void (*handler)(const Vec2 &));
void onMove(void (*handler)(const Vec2 &, const Vec2 *));
void onAppleSpawn(void (*handler)(const Vec2 &, const Vec2 *));
void move();
void reset();
private:
Direction body_[BOARD_HEIGHT][BOARD_WIDTH]{};
Direction dir_;
Vec2 head_;
Vec2 tail_;
Vec2 apple_;
void (*resetHandler_)(const Vec2 &) = nullptr;
void (*moveHandler_)(const Vec2 &, const Vec2 *) = nullptr;
void (*appleSpawnHandler_)(const Vec2 &, const Vec2 *) = nullptr;
void spawnApple(bool firstTime);
bool wallCollision() const;
bool selfCollision() const;
};
// ...
```
The most obvious addition here is 3 new private methods and members with `nullptr` assigned to them. If you have never worked with [function pointers](https://www.geeksforgeeks.org/function-pointer-in-cpp/) before, this `retType (*ptrName)(type params)` syntax might seem incredibly confusing and alien. Basically, I'm defining these handlers as pointers to void functions that accept 1 or 2 parameters of type `const Vec2 &` (read-only reference to a coordinate) or `const Vec2 *` (read-only pointer to a coordinate). Why is the 2nd parameter of `appleSpawnHandler` and `moveHandler_` a pointer and not a reference? Because they correspond to the *old apple position* and *old tail position*s respectively, which can be `nullptr`: in the case of `appleSpawnHandler_`, it will be null if there is no old apple position to paint black (it's the first time an apple's been spawned); and for `moveHandler_`, it's null when we don't want to remove old tail (because the snake just ate an apple and has to grow).
The other change I made was make `head_`, `apple_` and `tail_` private instead of public (no getters needed) because they are already being passed as arguments to the handlers. If you are observant enough, the fact that I added an underscore to their names from the very beginning was a spoiler for this change.
Last change is minimal but telling, I added a parameter to `spawnApple()` called `bool firstTime`, which will let the function know whether it should give `appleSpawnHandler_` the address to the *old apple position*, or pass `nullptr` to it.
**Note**: I recognise that I could also just <mark>send the apple's current position regardless, and have the handler paint the block black first, then paint the apple again</mark>. This is a way to avoid having this extra param, and I only realized AFTER I finished the project :D. Anyway, here's the updated implementation inside `src/Snake.cpp`:
```cpp
// ...
void Snake::move() {
Vec2 oldTail = tail_;
bool ateApple = false;
// ...
tail_.x = head_.x;
tail_.y = head_.y;
if (moveHandler_ != nullptr)
moveHandler_(head_, ateApple ? nullptr : &oldTail);
}
void Snake::reset() {
// ...
if (resetHandler_ != nullptr) resetHandler_(head_);
spawnApple(true);
}
void Snake::spawnApple(const bool firstTime) {
const Vec2 oldApple = apple_;
// ...
if (appleSpawnHandler_ != nullptr)
appleSpawnHandler_(apple_, firstTime ? nullptr : &oldApple);
}
// ... wallCollision()
void Snake::onReset(void (*handler)(const Vec2 &)) { resetHandler_ = handler; }
void Snake::onMove(void (*handler)(const Vec2 &, const Vec2 *)) {
moveHandler_ = handler;
}
void Snake::onAppleSpawn(void (*handler)(const Vec2 &, const Vec2 *)) {
appleSpawnHandler_ = handler;
}
```
Remember, this isn't the final version, and some things WILL change on the next iteration but for now this is all we need to finally visualize what I promised would happen; without leaving trails or superposing stuff, of course!
## Uploading iteration #2
It's time to update the main sketch script and test that things now behave as I said they would a few sections ago. Here's the updated code for `src/main.cpp`:
```cpp
// ...
void setup() {
// ...
snake.onReset([](const Vec2 &head) {
tft.fillScreen(BLACK);
drawBlock(head.x, head.y, WHITE);
});
snake.onMove([](const Vec2 &head, const Vec2 *oldTail) {
if (oldTail != nullptr) drawBlock(oldTail->x, oldTail->y, BLACK);
drawBlock(head.x, head.y, WHITE);
});
snake.onAppleSpawn([](const Vec2 &newApple, const Vec2 *oldApple) {
if (oldApple != nullptr) drawBlock(oldApple->x, oldApple->y, BLACK);
drawBlock(newApple.x, newApple.y, BLUE);
});
// ...
}
// ... loop()
```
Don't forget to remove the line that says `tft.fillScreen(BLACK);` after `tft.setRotation(3);` since it's gonna be done inside a handler instead.
Now, upload the sketch and observe the result. Looks pretty simple and pointless right? Who'd want to stare at a white square trapped inside a loop, unable to even eat the unsuspecting apple that dares to be on its path. Well, in the next section we're going to finish the `move()` method, add the joystick to the mix, and play around with the final result!
## Finishing the game's mechanics
Our snake can move, but it has no way of eating and growing yet, it doesn't check for self-collision (because there is no point yet), nor it properly updates its tail position after it moves; and on top of everything, it can't even change direction! Let's start implementing these things one by one, starting with changing direction:
```cpp
// ... Snake.cpp
void Snake::changeDir(const Direction dir) {
const bool isOpposite =
(dir_ == UP && dir == DOWN) || (dir_ == DOWN && dir == UP) ||
(dir_ == RIGHT && dir == LEFT) || (dir_ == LEFT && dir == RIGHT);
if (!isOpposite) dir_ = dir;
}
// ...
```
We had already defined the method, we just hadn't implemented it yet! All there is to it is accept a direction as parameter and check for a 180° direction change before assigning it to the corresponding member. Do I think this is the safest way of doing it? No... there are many bugs that can stem from this but given the simple nature of my project, I chose not to address the issue; I did however in a different implementation where I had 2 direction variables: the actual direction that only changes on every tick, and a tentative direction that is changed every frame (through event polling) or obtained from event handlers.
Next up, the super complex algorithm to check for self-collision:
```cpp
// ... src/Snake.cpp
bool Snake::selfCollision() const {
return body_[head_.y][head_.x] != NONE;
}
// ...
```
Yep, thanks to the way the snake's body is implemented (no double ended queue, array, linked list, etc), I don't need to have a loop. All I need to do is ask the 2D array if the coordinate `(x, y)` (where `x` and `y` are the members of the head's position) has a snake body part (any direction that isn't `NONE`).
Have you wondered yet why I'm storing directions inside `body_` and not just booleans? It's because I need them in order to find the next position of the tail once the snake moves! For example, if `body_[tail_.y][tail_.x]` has an `UP` value, it means that the next tail will be `{ .x = tail_.x, .y = tail_.y - 1 }`. And of course, after updating the tail's position I need to set that cell to `NONE`. Having all that in mind, here's the updated `move()` code:
```cpp
// ... src/Snake.cpp
void Snake::move() {
Vec2 oldTail = tail_;
bool ateApple = false;
body_[head_.y][head_.x] = dir_;
head_ += dir_;
if (wallCollision()) {
reset();
return;
}
if (head_.x == apple_.x && head_.y == apple_.y) {
spawnApple(false);
ateApple = true;
} else {
const Direction tailDir = body_[tail_.y][tail_.x];
body_[tail_.y][tail_.x] = NONE;
tail_ += tailDir;
}
if (selfCollision()) {
reset();
return;
}
if (moveHandler_ != nullptr)
moveHandler_(head_, ateApple ? nullptr : &oldTail);
}
// ...
```
I show you the entire method's code instead of commenting out the unchanged lines because I didn't want any confusion as to what was added and what was removed. At the very start of the method, we need to save the old tail (copied by value into a local variable called `oldTail`) and initialize a `ateApple` boolean thattells the `moveHandler_` whether it should paint the background color on top of the old tail's white block or not.
After that, it saves the current head's direction inside `body_`, which will eventually allow the method to update the tail's position, Then the head moves to the corresponding direction and if it collides against a wall, the state is reset.
Next is the interesting part: **growing**! If the head's position coincides with the apple's position, spawn a new apple (passing `false` to tell `appleSpawnHandler_` not to paint anything black); and if not, it didn't grow and thus the tail needs to be removed and updated the way I mentioned earlier. Finally, it checks for self collision, resetting in case. And then, sends the appropriate info to the successful move handler.
**NOTE**: You may have noticed I've done null checks for all 3 handlers. This is because it's not guaranteed that the client will provide such handlers, and we don't want to enable null pointer exceptions out here, am I right? An alternative is to initialize the handlers with default ones that do absolutely nothing (or anything you want, really). Or maybe you are into the observer pattern, or pub-sub, who knows...
### What about spawning apples on top of the snake?
Funny you should ask! I really don't mind, but if you do care, you can do two things:
1. Keep getting random `Vec2`s until it **doesn't** coincide with a body part (or the head). This can be done with a while loop, but the downside is that the longer the snake grows, the less available spots to spawn, meaning more potential for very long loops.
2. Keep an array filled with all available positions (those not hosting the head or the body), and every time an apple needs to spawn, pick one at a random. You do need to keep this array updated by adding the deleted tail and removing the updated head every time it moves. And maybe it's better to use a linked list for this.
## Connecting the joystick
Now that we finally have a way to change the snake's direction, and now that the direction change is actually relevant to the movement method, we need to connect the joystick to the Arduino and write some minimal code.
A joystick is nothing more than 2 potentiometers in one, with a button thrown in there just because sometimes you need extra buttons. Fun fact, for the longest time I didn't know you could press a joystick, let alone that those presses were actually mapped to an action in some games.
What is a potentiometer you say? In layman's terms, imagine a pull lever that <mark>when it's all the way down, has a value of 0, and 1024 when it's all the way up</mark>; that's kinda what a potentiometer is. Now imagine you have two of them, one maps to the horizontal axis `x`, and the other one, to the vertical axis `y`. Now imagine you put them into one metal box and have a plastic knob that when rotated around, can push and pull both at the same time a given amount.
Now you kinda see what I'm getting at! These potentiometers expose a pin that you can read from in your sketch's code (through `analogRead()`) when they're connected to any analog pin. The button pin is digital (`HIGH` when pressed, `LOW` when not pressed) but we're not going to use it for this project. Lastly, you need to connect its ground (`GND`) and 5 volt (`5V`) pins. In my case, my Arduino mega has 2 extra `5V` and `GND` pins on the vertical section to the very right, and some free analog pins (`A9` to `A15`). You can see how I connected mine in the picture above, or you can use a breadboard.
**Note**: If you use the shield on an Arduino UNO, you might not have any analog pin left. If you decide to use a breadboard, you can connect the control pins to digital pins instead of the analog ones that the shield connects to (A0 to A4). The [user manual](https://asset.conrad.com/media10/add/160267/c1/-/en/001525436ML02/manual-1525436-display-suitable-for-arduino-board-arduino-uno-arduino.pdf) tells you that the `RST` pin can also be connected to the board's *reset pin*.
## Uploading iteration #3 (final)
I'm again going to show you the entire code but for `src/main.cpp` to avoid any confusion:
```cpp
#include <Arduino.h>
#include <Elegoo_TFTLCD.h>
#include <Snake.h>
#include <constants.h>
Elegoo_TFTLCD tft(A3, A2, A1, A0, A4);
Snake snake;
uint16_t neutralX, neutralY;
uint16_t joystickX, joystickY;
void drawBlock(int8_t x, int8_t y, uint16_t color) {
tft.fillRect(x * BLOCK_SIZE, y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE, color);
}
void setup() {
Serial.begin(9600);
randomSeed(analogRead(A6));
tft.reset();
tft.begin(TFT_DRIVER_ID);
tft.setRotation(3); // Landscape
neutralX = analogRead(JOYSTICK_PIN_X);
neutralY = analogRead(JOYSTICK_PIN_Y);
snake.onReset([](const Vec2 &head) {
tft.fillScreen(BLACK);
drawBlock(head.x, head.y, WHITE);
});
snake.onMove([](const Vec2 &head, const Vec2 *oldTail) {
if (oldTail != nullptr) drawBlock(oldTail->x, oldTail->y, BLACK);
drawBlock(head.x, head.y, WHITE);
});
snake.onAppleSpawn([](const Vec2 &newApple, const Vec2 *oldApple) {
if (oldApple != nullptr) drawBlock(oldApple->x, oldApple->y, BLACK);
drawBlock(newApple.x, newApple.y, BLUE);
});
snake.reset();
}
void loop() {
joystickX = analogRead(JOYSTICK_PIN_X);
joystickY = analogRead(JOYSTICK_PIN_Y);
if (joystickX > neutralX + JOYSTICK_THRESHOLD) snake.changeDir(RIGHT);
else if (joystickX < neutralX - JOYSTICK_THRESHOLD) snake.changeDir(LEFT);
else if (joystickY > neutralY + JOYSTICK_THRESHOLD) snake.changeDir(DOWN);
else if (joystickY < neutralY - JOYSTICK_THRESHOLD) snake.changeDir(UP);
snake.move();
delay(INTERVAL);
}
```
You can immediately take notice of what I added:
1. 4 `uint16_t` variables that hold the `x` and `y` analog values from the joystick. The neutral ones are only written to once (inside `setup()`) and they serve one purpose: avoid making assumptions about the initial resting value of both potentiometers. When I monitored both values, I got 509 and 516, which are completely different from 512 (half of 1024, AKA, the true center).
2. Inside `loop()` I added some lines of code to read from the joystick on every frame and write to the `joystickX` and `joystickY` variables. And the simplest way I could come up with to determine the direction of the knob, was to just check if the horizontal or vertical values were above the neutral center plus a moderate threshold to require at least around 800-1024, or 0-200 in order to consider a direction change.
Like I've said before, this code is really not optimal but I tested it and it works, you just need to keep the joystick pointed to where you want the snake to go or the direction changes might not even happen (especially the bigger the interval between frames is).
## Final remarks
I left some things unimplemeted such as a *Game Over* screen, score display, a better apple spawning algorithm, and a better way to determine the direction of the joystick's knob. However, I will leave them to you as *homework* while I also work on it through the Github repository, and if I'm pleased with the new result I may come back and re-write the things that need to be rewritten (even if it's the entire tutorial).
I also left the whole screen wiring up in the air because this wasn't a tutorial about how to connect the screen, but rather how to code Snake, and make calls to `tft.fillScreen()` and `tft.fillRect()`. If you want to get more acquainted with your TFT screen's capabilities, explore and experiment with the example files.
Did I even mention that I connected the joystick analog pins to `A15` (for `VRx`) and `A14` (for `VRy`)? You can literally connect them to any free analog pins so it doesn't matter which ones I picked. Anyway, there are a lot of things that I could've done or explained better, but I'm always open for improving and taking suggestions. | luis_felipelpez_b2a2968 |
1,906,469 | Adding a User-Controlled Camera Feature To Our Python GUI Clock | In our previous tutorial, we built a customizable GUI clock using Python and Tkinter. Let's take it a... | 23,467 | 2024-06-30T10:12:03 | https://blog.learnhub.africa/2024/06/30/adding-a-user-controlled-camera-feature-to-our-python-gui-clock/ | python, programming, beginners, tutorial | In our previous [tutorial](https://blog.learnhub.africa/2024/06/21/how-to-build-a-gui-clock-with-python-a-comprehensive-step-by-step-guide/), we built a customizable GUI clock using Python and Tkinter. Let's take it a step further by adding a camera feature that allows users to capture and save images on demand. This project will introduce you to working with camera input in Python, enhancing your skills in GUI development and file handling.
## Setting Up the Environment
Before we begin, ensure you have the necessary libraries installed. We'll be using OpenCV for camera handling. Install it using pip:
pip install opencv-python
Next, we are going to Install `Pillow` using pip.
pip install Pillow
Now that we have installed all the dependencies, we can add the camera. We are going to create two kinds of cameras: a regular camera and a camera hidden behind clicks.
Stay with me.
```python
import cv2
from PIL import Image, ImageTk
import os
from datetime import datetime
```
## Creating the Camera Function
Let's add a function to handle camera capture:
```python
def capture_image():
# Initialize the camera
cap = cv2.VideoCapture(0)
if not cap.isOpened():
print("Error: Could not open camera.")
return
# Capture a frame
ret, frame = cap.read()
if not ret:
print("Error: Could not capture image.")
cap.release()
return
# Create a directory to store images if it doesn't exist
if not os.path.exists("captured_images"):
os.makedirs("captured_images")
# Generate a unique filename using timestamp
timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
filename = f"captured_images/image_{timestamp}.png"
# Save the image
cv2.imwrite(filename, frame)
print(f"Image saved as {filename}")
# Release the camera
cap.release()
# Display the captured image
display_image(filename)
```
Let's break down the `capture_image()` function in a way that's easy for beginners to understand. We'll go through each part step-by-step, explaining what's happening and why.
`def capture_image()`
This line creates a new function called `capture_image()`. Think of a function as a set of instructions we can use whenever we want to take a picture.
`cap = cv2.VideoCapture(0)`
Here, we're setting up our camera. Imagine you're turning on a digital camera:
- `cv2` is a tool (library) that helps us work with cameras and images in Python.
- `VideoCapture(0)` is like pressing the camera's power button. The 0 means "use the first camera you find" (usually the built-in webcam on a laptop).
- We're calling this camera setup `cap` (short for capture), so we can refer to it later.
```python
if not cap.isOpened():
print("Error: Could not open camera.")
return
```
This part checks if the camera turned on properly:
- `if not cap.isOpened():` asks, "Did the camera fail to turn on?"
- If it did fail, we print an error message.
- `return` means "stop here and exit the function" if there's a problem.
`ret, frame = cap.read()`
Now we're taking the actual picture:
`cap.read()` is like pressing the shutter button on a camera.
It gives us two things:
- `ret`: A yes/no answer to "Did the picture take successfully?"
- `frame`: The actual picture, if it was taken.
```python
if not ret:
print("Error: Could not capture image.")
cap.release()
return
```
This checks if the picture was taken successfully:
- If `ret` is "no" (which means the picture failed), we:
- Print an error message.
- `cap.release()` turns off the camera.
- `return` exits the function.
```python
if not os.path.exists("captured_images"):
os.makedirs("captured_images")
```
This part creates a special folder to store our pictures:
```python
if not os.path.exists("captured_images"):` checks if a folder named "captured_images" already exists.
```
- If it doesn't exist, `os.makedirs("captured_images")` creates this folder.
- It's like creating a new album to store your photos.
```python
timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
filename = f"captured_images/image_{timestamp}.png"
```
Here, we're creating a unique name for our picture:
`datetime.now()` gets the current date and time.
`.strftime("%Y%m%d_%H%M%S")` formats this time into a string like "20240628_152059" (Year-Month-Day_HourMinuteSecond).
- We use this to create a filename like "captured_images/image_20240628_152059.png".
- This ensures each picture has a unique name based on when it was taken.
```python
cv2.imwrite(filename, frame)
print(f"Image saved as {filename}")
```
Now we're saving the picture.
`v2.imwrite(filename, frame)` saves our picture (`frame`) with the filename we created.
We then print a message saying where the image was saved.
`cap.release()`
This line turns off the camera, like pressing the power button again when you're done.
`display_image(filename)`
Finally, we call another function to show the picture we just took on the screen.
In summary, this function does the following.
- Turns on the camera
- Check if the camera is working
- Takes a picture
- Makes sure the picture was taken successfully
- Creates a folder to store pictures if it doesn't exist
- Gives the picture a unique name based on the current time
- Saves the picture in the folder
- Turns off the camera
Each step has checks to ensure things are working correctly, and if there's a problem at any point, the function will stop and let us know what went wrong.
## Displaying the Captured Image
Add a function to display the captured image:
```python
def display_image(filename):
# Open the image file
img = Image.open(filename)
# Resize the image to fit in the window
img = img.resize((300, 200), Image.LANCZOS)
# Convert the image for Tkinter
photo = ImageTk.PhotoImage(img)
# Update the image label
image_label.config(image=photo)
image_label.image = photo
```
Let's start with a beginner-friendly explanation of file operations and then dive into the code.
File Operations for Beginners:
1. Read:
- This is like opening a book and looking at its contents.
- In programming, reading a file means accessing its content without changing it.
- Example: Opening an image to view it.
2. Write:
- This is like writing in a notebook.
- In programming, writing means adding new content to a file or changing existing content.
- Example: Saving a new image or modifying an existing one.
3. Execute:
- This is like following a set of instructions.
- In programming, executing usually refers to running a program or script.
- For images, we don't typically "execute" them, but we can process or display them.
Now, let's focus on the `display_image(filename)` function:
`def display_image(filename)`
This line defines a function named `display_image` that takes a `filename` as input. This filename is the path to the image we want to display.
`img = Image.open(filename)`
Here's where we use the "read" operation:
- `Image.open()` is a function from the PIL (Python Imaging Library) that opens an image file.
- It's like telling the computer, "Please look at this picture for me."
- The opened image is stored in the variable `img`.
- This operation doesn't change the original file; it allows us to work with its contents.
`img = img.resize((300, 200), Image.LANCZOS)`
This line resizes the image:
- `img.resize()` changes the size of the image.
- `(300, 200)` sets the new width to 300 pixels and height to 200 pixels.
- `Image.LANCZOS` is a high-quality resizing method that helps maintain image quality.
`photo = ImageTk.PhotoImage(img)`
This line converts the image for use with Tkinter (the GUI library we're using):
- `ImageTk.PhotoImage()` takes our resized image and converts it into a format that Tkinter can display.
- This converted image is stored in the `photo` variable.
```python
image_label.config(image=photo)
image_label.image = photo
```
These lines update the GUI to show the image:
- `image_label` is a Tkinter widget (like a container) that can display images.
- `config(image=photo)` tells this label to display our processed image.
- `image_label.image = photo` is a special line that prevents the image from being deleted by Python's garbage collector.
In summary, this function does the following:
1. Opens an image file (read operation).
2. Resize the image to fit nicely in our GUI window.
3. Converts the image to a format our GUI system (Tkinter) can understand.
4. Updates a label in our GUI to display this image.
This process doesn't involve writing to the file or executing it. We're simply reading the image, processing it in memory, and displaying it in our application.
## Adding GUI Elements
Update your existing GUI to include a button for image capture and a label to display the image:
# Add this after your existing GUI elements
capture_button = tk.Button(window, text="Capture Image", command=capture_image)
capture_button.pack(anchor='center', pady=5)
image_label = tk.Label(window)
image_label.pack(anchor='center', pady=10)
- Adjusting the Window Size:
You may need to adjust the window size to accommodate the new elements:
window.geometry("350x400") # Increase the height
- Complete Code:
Here's the complete code incorporating the new camera feature:
```python
import tkinter as tk
from time import strftime
import cv2
from PIL import Image, ImageTk
import os
from datetime import datetime
window = tk.Tk()
window.title("Python GUI Clock with Camera")
window.geometry("350x400")
is_24_hour = True
def update_time():
global is_24_hour
time_format = '%H:%M:%S' if is_24_hour else '%I:%M:%S %p'
time_string = strftime(time_format)
date_string = strftime('%B %d, %Y')
time_label.config(text=time_string)
date_label.config(text=date_string)
time_label.after(1000, update_time)
def change_color():
colors = ['black', 'red', 'green', 'blue', 'yellow', 'purple', 'orange']
current_bg = time_label.cget("background")
next_color = colors[(colors.index(current_bg) + 1) % len(colors)]
time_label.config(background=next_color)
date_label.config(background=next_color)
def toggle_format():
global is_24_hour
is_24_hour = not is_24_hour
def capture_image():
cap = cv2.VideoCapture(0)
if not cap.isOpened():
print("Error: Could not open camera.")
return
ret, frame = cap.read()
if not ret:
print("Error: Could not capture image.")
cap.release()
return
if not os.path.exists("captured_images"):
os.makedirs("captured_images")
timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
filename = f"captured_images/image_{timestamp}.png"
cv2.imwrite(filename, frame)
print(f"Image saved as {filename}")
cap.release()
display_image(filename)
def display_image(filename):
img = Image.open(filename)
img = img.resize((300, 200), Image.LANCZOS)
photo = ImageTk.PhotoImage(img)
image_label.config(image=photo)
image_label.image = photo
time_label = tk.Label(window, font=('calibri', 40, 'bold'), background='black', foreground='white')
time_label.pack(anchor='center')
date_label = tk.Label(window, font=('calibri', 24), background='black', foreground='white')
date_label.pack(anchor='center')
color_button = tk.Button(window, text="Change Color", command=change_color)
color_button.pack(anchor='center', pady=5)
format_button = tk.Button(window, text="Toggle 12/24 Hour", command=toggle_format)
format_button.pack(anchor='center', pady=5)
capture_button = tk.Button(window, text="Capture Image", command=capture_image)
capture_button.pack(anchor='center', pady=5)
image_label = tk.Label(window)
image_label.pack(anchor='center', pady=10)
update_time()
window.mainloop()
```
## Conclusion
You've now enhanced your GUI clock with a user-controlled camera feature. This addition demonstrates how to integrate hardware interactions into a Python GUI application, handle file operations, and dynamically update the interface.
Always respect user privacy and obtain the necessary permissions when working with camera features in your applications.
## **Resource**
- [How to Identify a Phishing Email in 2024](https://blog.learnhub.africa/2024/06/10/how-to-identify-a-phishing-email-in-2024/)
- [Build Your First Password Cracker](https://blog.learnhub.africa/2024/02/29/build-your-first-password-cracker/)
- [Python for Beginners](https://www.python.org/about/gettingstarted/)
| scofieldidehen |
1,906,468 | My Programming Journey: Backend | Hello, my name is Jefferson Henry, I’m a software engineer and full stack developer currently... | 0 | 2024-06-30T10:09:59 | https://dev.to/jeff_hen_c38ea40eadf6121b/my-programming-journey-backend-2p2c | webdev, backend, programming, web | Hello, my name is Jefferson Henry, I’m a software engineer and full stack developer currently studying software engineering at Ritman University.
Did you know that about 73.3% of men and 26.6% of women are into tech? Similarly, 7% of the total US workforce works in the tech industry, making tech one of the most dynamic sectors in the workforce. Technology has become one of the fastest rising advancements in humanity, still growing rapidly with groundbreaking discoveries being made every day. It breaks the boundaries of the impossible and exposes the world to the possibilities of a great mind.
Today I would love to take you through my journey in discovering one of the core aspects of tech which is programming and how HNG has greatly impacted my study and love for tech. I was born in Cross River State, Nigeria. in the early 2000s, I grew up surrounded by the rich culture and innovative spirit of my region. I completed my high school education at Estate Model High before moving on to pursue a bachelor's degree at Ritman University. From a young age, I was drawn to technology and science, inspired by the stories of tech pioneers and the vast information available online. Encouraged by my peers, I decided to explore programming during my tenth grade. I spent countless hours researching what it takes to become a programmer, diving deep into the world of coding and software development.
At 11th grade, I had transitioned from theory to practice, writing my first programs and experiencing the thrill of creating something from scratch. This hands-on journey reached a new milestone in my first year in university when I successfully built my first webpage. That achievement cemented my dedication to programming and web development. As my skills developed, I expanded my focus beyond frontend to backend development, a field that combines creativity with technical skill. I found immense joy in bringing my ideas to life through code, whether it was a new project or a dynamic website. Today, I continue to create sustainable databases and server-side development of web applications, constantly learning and embracing new technologies. Each project is an opportunity for growth and innovation. What began as a curiosity in my school years has blossomed into a fulfilling career path, fueled by my passion for technology and its limitless possibilities.
During my first year of university, I was introduced to HNG internship by a fellow student interning with the company ‘what is HNG?’. HNG Internship is a fast-paced bootcamp for learning digital skills. It's focused on advanced learners and those with some pre-knowledge, and it gets people into shape for job offers. I was captivated by the opportunity to be working with fellow tech enthusiast and intern what an actual company so I took on the opportunity to work with HNG and I joined their i11 internship which I’ve discovered to challenging but exciting and I hope to finish. Here is a link to hng internship https://hng.tech/internship
MY JOURNEY IN BACKEND WEB DEVELOPMENT
Now further into my programing journey and mastering the basics in web-dev which includes knowledge of HTML, CSS, and JavaScript I moved on further in the world of web technology grasping concept like database manipulation with MySQL and server-side development with php and JavaScript
What is backend?
backend refers to the part of web-dev users cannot see, such as databases, servers, and application logic. A backend developer is responsible for building and maintaining the mechanisms that process data and perform actions on websites including handling tasks like API integration, security and performance optimization. Backend version control helps manage code changes and collaboration among common platforms using software like git. Here is a project of mine using github https://henjefferson.github.io/ .
I found backend more complexed compared to frontend and definitely more challenging with its wide variety of tools like Node.js, C# net and Go, which I’m currently still developing my skills in. I’ve had many struggles learning backend one of which being error handling and debugging.
ERROR HANDLING AND DEBBUGING
Error handling in backend is how systems deal with errors that occur during the execution of a program or application. is the process of discovering vulnerabilities and bugs in your code to ensure the system operates smoothly. Techniques like try-catch block, error codes and logging are used to manage errors effectively.
When building a bitcoin payment system where users had to fill in their email and phone number. The users will provide their information and the backend will check to see their details are correct. During the testing of Software, I discovered errors when users input in an email that has already been used in another account. This is a good example of an error in the backend and I’ll work you through the steps in solving it.
The first step was detecting the error which occurred because the same emails were used in different accounts causing a double occurrence and security issues. The second step was writing a response in which the system should provide a clear error message to the user indicating that the email is already in use and prompting them to try a different email. And the last step is adding a prevention mechanism which implements a validation check during the sign-up process to ensure unique emails are used. This solves the problem and makes the software more accountable and secure.
The issue above is a recent problem I faced using backend and the steps I took to overcome them.
For more enquiries on hng visit https://hng.tech/hire.
 | jeff_hen_c38ea40eadf6121b |
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1,906,466 | Buy GitHub Accounts | https://dmhelpshop.com/product/buy-github-accounts/ Buy GitHub Accounts GitHub holds a crucial... | 0 | 2024-06-30T10:07:26 | https://dev.to/carika4293/buy-github-accounts-2iem | typescript, machinelearning, discuss, news | https://dmhelpshop.com/product/buy-github-accounts/
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1,906,465 | Exploring the Power of React.js and Next.js in Modern Web Development | Exploring the Power of React.js and Next.js in Modern Web Development In the ever-evolving landscape... | 0 | 2024-06-30T10:04:00 | https://dev.to/biodun_raji/exploring-the-power-of-reactjs-and-nextjs-in-modern-web-development-180e |
Exploring the Power of React.js and Next.js in Modern Web Development
In the ever-evolving landscape of web development, React.js has emerged as a cornerstone technology for building dynamic and responsive user interfaces. As a powerful JavaScript library, React.js enables developers to create interactive web applications with ease. Paired with frameworks like Next.js, it becomes even more potent, offering features such as server-side rendering and static site generation.
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1,905,343 | 【Kaggle】HMS 2nd Solution explaind | This time, I'll explain the 2nd solution of HMS competition on kaggle. the original solution is... | 0 | 2024-06-29T07:19:57 | https://dev.to/moyuto/kaggle-hms-2nd-solution-explaind-34jj | This time, I'll explain the 2nd solution of HMS competition on kaggle.
the [original solution](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/492254) is here:
https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/492254
# 0. Competiton explanation
This competition's purpose is classification to the 182 type bird calls.
The validation method is AUC-ROC, so we had to predict all of birds classes.
Competition host provide the random length audio calling data over 240000 samples as training data, and data not labeled for utilize to augmentation or otehrs.
As the problem must be addressed were:
unbalanced data, probably noisy and mixed test data, data while bird not calling, etc..
Additionaly point to be noted is the limitation of submittion. This competition only allow CPU and under 120 minutes for inference. We have to both infer and process the data in time.
If you wanna know details, reccoemnd you check the competition overview and dataset.
https://www.kaggle.com/c/birdclef-2024
### 0.1 Technique used
- Use MNE-tool for signal(eeg) processing
- Use scipy.signal for filtering(scipy has various fiter)
- hgnet: is [this](https://huggingface.co/timm/hgnetv2_b5.ssld_stage2_ft_in1k)?
### 0.2 Point to see
- 2D-CNN is not well-equipped to capture positional information with in the channels. Because there is not pad in channel direction.
- Using **3D-CNN model** with 16channnel input fitered by 0.5~20Hz
- Same model but different library's(mne and scipy) filter for diversity.
- Double feature head(eeg + spectrum) (chap 1.4)
- 2 stage learning (chap 3)
- Random offset sampling and average as label (chap 3)
After here is the solution.
# 1. Model
In early time, feeding a bsx4xHxM input to the 2D-CNN produce worse result than the one-image method. Then author start to think why?
Due to the position-sensitive nature of labels(LPD, GPD, etc.), We should take care of the channel dimention. 2D-CNN is not well-equipped to capture positional information with in the channels. Because there is not pad in channel direction. And that's why they need to concat the spectrum into one image for a vision model other than a bsx16xHxW image(double banana montage: spectrum created from 16 types of signals depending on the location of the brain).
So author decided to use 3d-CNN for spectrum, and 2D-CNN model for raw-eeg signal.
total solution like this:
- mne 0.5-20Hz means use MNE-tool do filter.
- scypy.signal means use scipy.signal to do filter.
- For the reshape operator and the stft params please refer to the codes below.
- And the number in () means final weights of the ensemble.[0.2, 0.2, 0.2, 0.1, 0.1, 0.2]
### 1.1 ×3d-l (spectrum model)
After double banana montage, +- 1024 clip and 0.5-20Hz filter, use stft to extract the spectrum, then feed to a 3d-CNN(x3d-l).
explanation of words(My interpretation):
・Double banana montage: This is a specific montage setup used in EEG signal processing where signals from pairs of electrodes are subtracted from each other to emphasize differences and reduce common noise.
・±1024 clip: Limits the signal amplitude to the range between -1024 and +1024.
・0.5-20Hz filter: Applies a bandpass filter to retain frequencies between 0.5 Hz and 20 Hz, which is typical for isolating certain EEG signal components.
・STFT (Short-Time Fourier Transform): Transforms the time-domain signal into the frequency domain over short time segments to extract the spectrum.
・3D-CNN (x3d-l): A 3D Convolutional Neural Network model that processes the spectral data.
The input data is a 16-channls spectrum image.
X3d-l cv 0.21+, public lb 0.25, private lb 0.29.
stft code like below, use it as a nn.Module:
```python
class Transform50s(nn.Module):
def __init__(self, ):
super().__init__()
self.wave_transform = torchaudio.transforms.Spectrogram(n_fft=512, win_length=128, hop_length=50, power=1)
def forward(self, x):
image = self.wave_transform(x)
image = torch.clip(image, min=0, max=10000) / 1000
n, c, h, w = image.size()
image = image[:, :, :int(20 / 100 * h + 10), :]
return image
class Transform10s(nn.Module):
def __init__(self, ):
super().__init__()
self.wave_transform = torchaudio.transforms.Spectrogram(n_fft=512, win_length=128, hop_length=10, power=1)
def forward(self, x):
image = self.wave_transform(x)
image = torch.clip(image, min=0, max=10000) / 1000
n, c, h, w = image.size()
image = image[:, :, :int(20 / 100 * h + 10), :]
return image
class Model(nn.Module):
def __init__(self):
super().__init__()
model_name = "x3d_l"
self.net = torch.hub.load('facebookresearch/pytorchvideo',
model_name, pretrained=True)
self.net.blocks[5].pool.pool = nn.AdaptiveAvgPool3d(1)
# self.net.blocks[5]=nn.Identity()
# self.net.avgpool = nn.Identity()
self.net.blocks[5].dropout = nn.Identity()
self.net.blocks[5].proj = nn.Identity()
self.net.blocks[5].activation = nn.Identity()
self.net.blocks[5].output_pool = nn.Identity()
def forward(self, x):
x = self.net(x)
return x
class Net(nn.Module):
def __init__(self, num_classes=1):
super().__init__()
self.preprocess50s = Transform50s()
self.preprocess10s = Transform10s()
self.model = Model()
self.pool = nn.AdaptiveAvgPool3d(1)
self.fc = nn.Linear(2048, 6, bias=True)
self.drop = nn.Dropout(0.5)
def forward(self, eeg):
# do preprocess
bs = eeg.size(0)
eeg_50s = eeg
eeg_10s = eeg[:, :, 4000:6000]
x_50 = self.preprocess50s(eeg_50s)
x_10 = self.preprocess10s(eeg_10s)
x = torch.cat([x_10, x_50], dim=1)
x = torch.unsqueeze(x, dim=1)
x = torch.cat([x, x, x], dim=1)
x = self.model(x)
# x = self.pool(x)
x = x.view(bs, -1)
x = self.drop(x)
x = self.fc(x)
return x
```
### 1.2 one image
It's a 2d vision model, efficientnetb5, public lb 0.262490 prvate lb 0.304877.
For 2d model, author concat 16 channels spectrum image like many peple does.
```python
image = torch.reshape(image, shape=[n, 2, -1, w])
x1 = image[:, 0:1, ...]
x2 = image[:, 1:2, ...]
image = torch.cat([x1, x2], dim=-1)
image = torch.cat([image, image, image], dim=1)
```
Author check the submission score, combine these two spectrum model, get 0.28 private lb.
### 1.3 eeg model
View eeg (bsx16x10000) as an image. So expand dim=1(bsx1x16x10000), but the time dimention is too large. Then author make a reshape.
The model define as below:
```python
rclass Net(nn.Module):
def __init__(self,):
super(Net, self).__init__()
self.model = timm.create_model('efficientnet_b5', pretrained=True, in_chans=3)
self.pool = nn.AdaptiveAvgPool2d(1)
self.fc = nn.Linear(2048, out_features=6, bias=True)
self.dropout = nn.Dropout(p=0.5)
def extract_features(self, x):
feature1 = self.model.forward_features(x)
return feature1
def forward(self, x):
# extarct batch size
bs = x.size(0)
# reshape (bs, 16, 10000) -> (bs, 16, 1000, 10)
reshaped_tensor = x.view(bs, 16, 1000, 10)
# pemute to (bs, 16, 10, 1000)
reshaped_and_permuted_tensor = reshaped_tensor.permute(0, 1, 3, 2)
# reshape (bs, 16, 10, 1000) -> (bs, 160, 1000)
reshaped_and_permuted_tensor = reshaped_and_permuted_tensor.reshape(bs, 16 * 10, 1000)
# add new dimention at index 1, shape will be (bs, 1, 160, 1000)
x = torch.unsqueeze(reshaped_and_permuted_tensor, dim=1)
# concat the image to simulate RBG channel and increasing capacity, shape is (bs, 3, 160, 1000)
x = torch.cat([x, x, x], dim=1)
bs = x.size(0)
x = self.extract_features(x)
x = self.pool(x)
x = x.view(bs, -1)
x = self.dropout(x)
x = self.fc(x)
return x
```
forward_features() function in timm can extarct feature as like CNN, and it is used here.
The eeg 'reshaped' to bsx3x160x1000. With efficientnetb5, actives public lb 0.230978, private lb 0.282873.
There are 3models, but slightly different, mne-filter-efficientnetb5, scipy-filter-efficientnetb5 and mne-filter-hgnetb5
And the scires are slightly different,also.
### 1.4 Doublehead (eeg+spectrum)
Author use x3d-l to extarct the spectrum feature (with transform50s only), efficientnetb5 to extract the raw eeg feature.
Like the solution figure, concat the last feature, public lb 0.24, private lb 0.29? not sure.
# 2. Preprocess
- 2.1 Double banana montage, eeg as 16x10000
- 2.2 Filter with 0.5-20Hz
- 2.3 Clip by +-1024
# 3. Train
- 3.1 Stage 1, 15 epochs, with loss weght voters_num/20, Adamw lr=0.001, cos schedule
- 3.2 Stage 2, 5epoch, loss weight=1, voters_num>=6, Adamw lr=0.0001, cos schedule
- 3.3 use eeg_label_offset_seconds. Author random choose an offset for each eegid, and the target is average according to eegid for each train iter.
- 3.4 Augmentation: mirror eeg, flip between left brain data and right brain data
- 3.5 10 folds, then move 1000 samples from val to train, left 709 samples in val set. And use vote_num>=6 to do validation.
\* voters_num equal number of vote, the competion data has number of voter for determine what the symptoms are.
# 4. Ensemble
By combining these models, author thinks it could get their current score. However their score is 6 model emsemble, but not improvement that much (0.28->0.27 private lb).
Final ensemble including:
- 2 spectrum model(x3d, efficientnetb5)
- 3 raw eeg model(efficientnetb5 with mne.filter, efficientnetb5 -butter filter, 1 ghnetb5 mne.filter)
- 1 eeg-spectrum mix model, butter filter
With weigts = [0.1,0.1,0.2,0.2,0.2,0.2].
ps. with-mne.filter means use mne lib to do filter, butter filter means use scipy.signal, just to add some diversity.
# 5 Some thought
Author thinks raw eeg is more important in this task. Feeding raw EEG data into a 2D visual model is somewhat similar to how humans observe EEG signals. Observe in time and channel dimensions！
# 6. Summary
Author using
1. raw eeg as 160x1000 data
2. spectrum as input of 2d-cnn and 3d-cnn
3. extract feature from both of eeg(efficientnetb5) and spectrum(x3d-l) for mix model
4. 2stage train(only high quality data in stage 2), augmentation
5. different filter
and impotant others. This is a great work and solution!
I think top-tier kaggler do all of basically things, and trying new methods with solid evidence of some experimental results. This is the important thing to win the competiton.
But, also enjoying competition is one of the most important thing, let we don't forget that!
# Reference
[1] coolz, [2nd place solution](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/492254), kaggle
| moyuto | |
1,906,461 | Implementing Batch Write Operations in Firestore with Express | Learn how to use Express to implement a Firestore batch write operation for improved performance and reliability in your web applications. | 0 | 2024-06-30T10:00:46 | https://dev.to/itselftools/implementing-batch-write-operations-in-firestore-with-express-5h64 | javascript, node, firebase, firestore |
At [itselftools.com](https://itselftools.com), our experience in developing over 30 applications utilizing technologies like Next.js and Firebase has offered us profound insights into efficient data handling and server management. One of the common scenarios we frequently handle in our cloud applications is performing bulk data operations, efficiently and securely. In this article, I'll walk you through how to implement a batch write operation in Firestore using an API route in Express.
### Code Overview
Take a look at this essential piece of code:
```
// API Route to perform a batch write operation in Firestore
app.post('/api/batch-write', async (req, res) => {
const db = firebase.firestore();
const batch = db.batch();
const docs = req.body;
docs.forEach(doc => {
const docRef = db.collection('items').doc();
batch.set(docRef, doc);
});
await batch.commit();
res.status(200).send('Batch write successful');
});
```
### Breakdown of the Code
1. **Creating an Instance of Firestore:** The code starts by creating an instance of Firestore database.
2. **Initializing a Batch Operation:** We then initialize a `batch` which is used to accumulate operations that are committed atomically. This helps in reducing network overhead and ensures data integrity during batch processing.
3. **Setting Up Document References:** Each document from the request body is processed in a forEach loop. For each document, a new document reference is created in the 'items' collection.
4. **Writing to the Batch:** The document is then added to the batch using `batch.set()`. Thereby preparing all documents to be written in a single transaction.
5. **Committing the Batch:** Finally, the batch operations are committed to the database, and upon success, a 200 status message is sent back to the client.
### Practical Uses
Batch operations are crucial in scenarios where the application needs to handle large amounts of data simultaneously — for example, when importing data from an external source or when multiple records need to be added or updated at once. This reduces the number of network calls made to the database, thereby enhancing performance and reliability.
### Conclusion
Batch writing in Firestore is an essential feature for web applications that require high performance and consistency when handling multiple documents. By using the method described above, developers can enhance their data handling capabilities in Firestore-backed applications.
To see similar code snippets in action, feel free to explore some of our applications: [explore audio data on Voice Recorder](https://voice-recorder.io), [test your mic here](https://online-mic-test.com), or [extract files using Online Archive Extracter](https://online-archive-extractor.com).
| antoineit |
1,906,460 | Front End technologies | Frontend development has witnessed a remarkable evolution in recent years, with the emergence of... | 0 | 2024-06-30T10:00:44 | https://dev.to/0yama/front-end-technologies-1ii |
Frontend development has witnessed a remarkable evolution in recent years, with the emergence of powerful libraries and frameworks that have redefined the way web applications are built. Beforehand when there were no technologies it took more time and mental energy to build a complex website or web-based software , but with the advent of frameworks all the tedious task are made easy.
My names are Godstime Oyama a web frontend developer. To me Frontend technologies have done a great job or should I say do a great job to make building a software quick and seamlessly.
I’ve tried the React JS framework which has really eased work than when I was working with the pure vanilla Js.
React.js, developed by Facebook, has gained widespread popularity for its component-based architecture and virtual DOM implementation. It provides a seamless way to build interactive user interfaces with its declarative and efficient rendering system.
I’m excited to join the HNG community where I can learn more about other frameworks or better still the the React Js framework better.
So you too can join the community via the links https://hng.tech/internship or if you’re looking to hire visit https://hng.tech/hire
Thanks for your time
| 0yama | |
1,906,459 | Keep listening or do your job and finish | People talk a lot about so-called design patterns (usually referencing those made in the famous book... | 0 | 2024-06-30T09:58:09 | https://dev.to/altavir/keep-listening-or-do-your-job-and-finish-2hej | kotlin, api | People talk a lot about so-called design patterns (usually referencing those made in the [famous book](https://en.wikipedia.org/wiki/Design_Patterns) for C++). Though those patterns themselves are not universal, they change from language to language and their usage strongly depends on the specific task at hand. However, there are several among them that are more frequently used. One of those is the listener/observer pattern, which implies that an object is allowed to attach a listener object to it to observe its changes or other events.
In Kotlin syntax a general API for using a listener looks like this:
```kotlin
interface Observable {
fun addListener(owner: Any?, listener: (Event) -> Unit)
fun removeListener(owner: Any?)
}
```
The first method of this interface is quite obvious and familiar. `listener` is the callback which is used when something interesting happens in the `Observable`. The `Event` could be different and even could have several arguments instead of one. The thing people tend to forget about is the second argument: `owner`. It becomes important when we remember that listeners need not only to be added but removed as well. When you remove a listener, you need to specify which listener to remove. So, you either need to return a removal handler from an `addListener` method or provide an identity to the removed object. Sometimes people try to use the listener itself to provide listener identity like this: `fun removeListener(listener: (Event) -> Unit)`. But doing this is most probably a mistake because lambda functions identity is a tricky thing and at some point, it could produce unexpected results. Furthermore, one needs to store this function somewhere in case it needs to be removed. It is much better to use the owner of the listener (an object, that has an identity) as a handle. As an additional benefit, one could remove all listeners from the same handle or even use a `null` handle to remove all listeners.
Even with the handle identity problem solved, there is a problem of "hanging" listeners. In a dynamic structure, it is quite easy to forget to "detach" the listener that points to removed objects. It leads to a memory leak because the referenced object still exists in the listener so it could not be collected by GC.
The way to solve this problem is inspired by Kotlin [`SharedFlow`](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/-shared-flow/). It attaches a listener on each subscription and removes said listener automatically when the subscription flow is canceled or collected. This way, you do not need to think about removing the listener manually. You just stop listening.
Let us see, how we can do that in a "flowless" environment:
```kotlin
interface AutoDetachObservable {
fun listen(
scope: CoroutineScope,
listener: (Event) -> Unit
): Job
}
```
The `scope` provides a `CoroutineScope` in which the listener runs. When it is canceled, the listener (and all other listeners in the scope) is automatically detached. And the resulting `Job` could be canceled manually thus canceling only this subscription. This way the construct has not one, but two levels of control for subscription cancelation.
The implementation of this mechanism could look like this:
```kotlin
fun listen(
scope: CoroutineScope,
listener: (Event) -> Unit
): Job{
val id = generateUniqueId()
val job = scope.launch{ listenerRegistry[id] = listener }
job.invokeOnCompletion{ listenerRegistry.remove(id) }
return job
}
```
This way the removal of the listener will be triggered both on scope cancelation and on `Job` cancelation. The `id` is a simple internal implementation detail that ensures that internal listeners can be removed. It is attached to a specific job, so it needs not to be exposed to the external user.
An additional benefit of said approach is that there is a `CoroutineScope` provided, so with some additional changes, it is possible to make `listener` a suspended function and run it in the context of a listener, not in the target object. Making listeners suspended is quite useful in concurrent systems to avoid data races for events.
---
After I wrote the post, I found out that I've already written a related one two years ago: https://dev.to/altavir/to-flow-or-not-to-flow-message-subscription-in-kotlin-57ea.
---
The cover image is taken from ["Большой Ух"](https://ru.wikipedia.org/wiki/%D0%91%D0%BE%D0%BB%D1%8C%D1%88%D0%BE%D0%B9_%D0%A3%D1%85) cartoon. | altavir |
1,906,458 | c program for counting numbers | hello everyone i've been writing this program for counting numbers and i want to print it from... | 0 | 2024-06-30T09:57:46 | https://dev.to/legend01/c-program-for-counting-numbers-4o8p | c | **hello everyone i've been writing this program for counting numbers and i want to print it from certain starting point to certain extent**
```
//counting machine
#include<stdio.h>
int main()
{
int q1,q2,q3,q4,q5,q6,c=0,NOL,st;
printf("enter the number from where to how much combinations you want: ");
scanf("%d %d",&st,&NOL);
q1=q2=q3=q4=q5=q6=0;
for(q1=0;q1<=60;q1++)
{
for(q2=0;q2<=60;q2++)
{
for(q3=0;q3<=60;q3++)
{
for(q4=0;q4<=60;q4+=2)
{
for(q5=0;q5<=60;q5+=5)
{
for(q6=0;q6<=60;q6+=5)
{
c++;
if((q1+q2+q3+q4+q5+q6)==60 && c>=st && (q4/2)<=5)
{
if(c<=NOL)
{
printf("%d %d %d %d %d %d \n",q1,q2,q3,q4,q5,q6);
}
}
}
}
}
}
}
}
}
```
| legend01 |
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1,906,450 | What is Associative Arrays in Computer Science | In computer science, an associative array, map, symbol table, or dictionary is an abstract data type... | 0 | 2024-06-30T09:40:57 | https://dev.to/m__mdy__m/what-is-associative-arrays-in-computer-science-1dhe | webdev, beginners, programming, tutorial | In computer science, an associative array, map, symbol table, or dictionary is an abstract data type that stores a collection of (key, value) pairs, such that each possible key appears at most once in the collection. In mathematical terms, an associative array is a function with a finite domain. It supports 'lookup', 'remove', and 'insert' operations.
## The Dictionary Problem
The dictionary problem is the classic problem of designing efficient data structures that implement associative arrays. The two major solutions to the dictionary problem are hash tables and search trees. It is sometimes also possible to solve the problem using directly addressed arrays, binary search trees, or other more specialized structures.
Many programming languages include associative arrays as primitive data types, while many other languages provide software libraries that support associative arrays. Content-addressable memory is a form of direct hardware-level support for associative arrays.
Associative arrays have many applications, including such fundamental programming patterns as memoization and the decorator pattern.
The name does not come from the associative property known in mathematics. Rather, it arises from the association of values with keys. It is not to be confused with associative processors.
> Summary : The dictionary problem refers to the challenge of designing and implementing efficient data structures that support the functionality of associative arrays, which allow for the storage, retrieval, and management of key-value pairs. The goal is to develop data structures that can efficiently handle a set of operations such as insertion, deletion, and lookup.
## Operations
In an associative array, the association between a key and a value is often known as a "mapping"; the same word may also be used to refer to the process of creating a new association.
The operations that are usually defined for an associative array are:
1. **Insert or put**: add a new (key, value) pair to the collection, mapping the key to its new value. Any existing mapping is overwritten. The arguments to this operation are the key and the value.
2. **Remove or delete**: remove a (key, value) pair from the collection, unmapping a given key from its value. The argument to this operation is the key.
3. **Lookup, find, or get**: find the value (if any) that is bound to a given key. The argument to this operation is the key, and the value is returned from the operation. If no value is found, some lookup functions raise an exception, while others return a default value (such as zero, null, or a specific value passed to the constructor).
Associative arrays may also include other operations such as determining the number of mappings or constructing an iterator to loop over all the mappings. For such operations, the order in which the mappings are returned is usually implementation-defined.
A multimap generalizes an associative array by allowing multiple values to be associated with a single key. A bidirectional map is a related abstract data type in which the mappings operate in both directions: each value must be associated with a unique key, and a second lookup operation takes a value as an argument and looks up the key associated with that value.
### Basic Operations
1. **Insert or Put**: Adds a new (key, value) pair to the collection, or updates the value if the key already exists.
2. **Remove or Delete**: Removes the (key, value) pair associated with a given key from the collection.
3. **Lookup, Find, or Get**: Retrieves the value associated with a given key. If the key is not found, an exception might be raised or a default value returned.
### Additional Operations
1. **ContainsKey**: Checks if a specific key exists in the associative array.
2. **ContainsValue**: Checks if a specific value exists in the associative array.
3. **Size or Count**: Returns the number of (key, value) pairs in the associative array.
4. **IsEmpty**: Checks if the associative array is empty.
5. **Clear**: Removes all (key, value) pairs from the associative array.
6. **Keys**: Returns an iterable collection of all keys in the associative array.
7. **Values**: Returns an iterable collection of all values in the associative array.
8. **Entries**: Returns an iterable collection of all (key, value) pairs in the associative array.
### Properties and Characteristics
- **Uniqueness**: Keys are unique, meaning no two pairs can have the same key.
- **Mutable**: The contents (keys and values) of associative arrays can be modified.
- **Dynamic Sizing**: The size of an associative array can change dynamically as pairs are added or removed.
### Implementations
1. **Hash Tables**: The most common implementation, using a hash function to map keys to indices in an array.
- **Separate Chaining**: Uses linked lists or other structures to handle hash collisions by storing multiple elements at each index.
- **Open Addressing**: Resolves collisions by probing, or searching through alternative locations in the array.
2. **Self-Balancing Binary Search Trees**: Such as AVL trees or red-black trees, which maintain sorted order of keys.
- **Strengths**: Provide O(log n) time complexity for lookup, insertion, and deletion.
- **Weaknesses**: Generally slower in average-case performance compared to hash tables.
3. **Trie (Prefix Tree)**: A specialized tree used for storing associative arrays with string keys.
- **Strengths**: Efficient for common prefixes and can handle dynamic sets of strings.
- **Weaknesses**: Can consume a lot of memory for large datasets.
4. **Direct Addressing**: Uses an array where the position corresponds directly to the key.
- **Strengths**: Provides O(1) time complexity for all operations.
- **Weaknesses**: Impractical for large key spaces due to high memory usage.
### Specialized Variants
1. **Multimap**: Allows multiple values to be associated with a single key.
2. **Bidirectional Map**: Supports reverse lookups from values to keys.
3. **Ordered Dictionary**: Maintains a specific order of elements, either by insertion order or sorted order of keys.
### Use Cases
1. **Caching**: Storing results of expensive function calls or database queries.
2. **Configuration Management**: Storing configuration settings for software applications.
3. **Database Indexing**: Facilitating quick lookups in database systems.
4. **Memoization**: Storing previously computed values to avoid redundant calculations.
5. **Symbol Tables**: Used in compilers and interpreters to store information about variables, functions, and other entities.
### Language Support
Many programming languages provide built-in support for associative arrays, often with specific syntax and optimized implementations. Examples include:
- **Python**: `dict`
- **JavaScript**: `Object` and `Map`
- **Java**: `HashMap` and `TreeMap`
- **C++**: `std::map` and `std::unordered_map`
- **C#**: `Dictionary` and `SortedDictionary`
- **Ruby**: `Hash`
- **PHP**: Associative arrays are a core part of the language's array type
- **Rust** : `HashMap` and `BTreeMap`
### Performance Considerations
1. **Time Complexity**: Varies based on the underlying data structure.
- **Hash Tables**: O(1) average-case time complexity for insertion, deletion, and lookup.
- **Self-Balancing Trees**: O(log n) time complexity for insertion, deletion, and lookup.
- **Direct Addressing**: O(1) time complexity, but with potentially high space complexity.
2. **Space Complexity**: Depends on the efficiency of the data structure in managing memory.
- **Hash Tables**: Generally efficient, but can suffer from memory overhead due to load factors and collision handling mechanisms.
- **Trees**: More predictable memory usage but can be less space-efficient for sparse data sets.ssociative arrays in multi-threaded environments.
- **ConcurrentHashMap** in Java
- **Thread-safe dictionaries** in Python with locks or `collections.defaultdict`
2. **Persistent Data Structures**: Associative arrays that maintain their previous versions after updates, useful in functional programming.
- **Clojure**: Persistent hash maps and vectors
3. **Serialization and Deserialization**: Converting associative arrays to a format suitable for storage or transmission, and reconstructing them back.
- **JSON**: Common format for serializing associative arrays.
- **Protocol Buffers, Thrift**: Binary serialization formats for efficient data interchange.
## Properties
The operations of the associative array should satisfy various properties to ensure consistent and predictable behavior. These properties define how insertion, lookup, and removal operations interact with each other.
- `lookup(k, insert(j, v, D)) = if k == j then v else lookup(k, D)`
- `lookup(k, new()) = fail`, where fail is an exception or default value
- `remove(k, insert(j, v, D)) = if k == j then remove(k, D) else insert(j, v, remove(k, D))`
- `remove(k, new()) = new()`
### Definitions
Let's define the terms used in the properties:
- **k** and **j**: Keys in the associative array.
- **v**: Value associated with a key.
- **D**: An associative array.
- **new()**: A function that creates a new, empty associative array.
- **lookup(k, D)**: A function that retrieves the value associated with the key **k** in the associative array **D**. If the key **k** is not present in **D**, it returns an exception or a default value.
- **insert(j, v, D)**: A function that inserts the key-value pair (**j**, **v**) into the associative array **D**. If **j** already exists in **D**, it updates the value associated with **j** to **v**.
- **remove(k, D)**: A function that removes the key **k** and its associated value from the associative array **D**. If **k** is not present in **D**, the operation has no effect.
### Properties
1. **Lookup After Insertion**
`lookup(k, insert(j, v, D)) = if k == j then v else lookup(k, D)`
This property states that if you look up a key **k** after inserting a key-value pair (**j**, **v**) into the associative array **D**, the result depends on whether **k** is equal to **j**:
- If **k** equals **j**, the lookup should return the value **v** that was just inserted.
- If **k** does not equal **j**, the lookup should return the value associated with **k** in the original associative array **D**.
2. **Lookup in a New Associative Array**
`lookup(k, new()) = fail`
This property states that if you look up any key **k** in a newly created empty associative array, the operation should fail. The failure can be represented as an exception or a default value, indicating that the key **k** is not present in the associative array.
3. **Remove After Insertion**
`remove(k, insert(j, v, D)) = if k == j then remove(k, D) else insert(j, v, remove(k, D))`
This property describes the effect of removing a key **k** after inserting a key-value pair (**j**, **v**) into the associative array **D**:
- If **k** equals **j**, the removal operation should result in the associative array **D** without the key **k**.
- If **k** does not equal **j**, the removal operation should first remove the key **k** from the original associative array **D** and then insert the key-value pair (**j**, **v**). This ensures that the inserted pair (**j**, **v**) remains in the associative array, except for the key **k**.
4. **Remove in a New Associative Array**
`remove(k, new()) = new()`
This property states that removing any key **k** from a newly created empty associative array should result in another new empty associative array. Since the associative array is already empty, the removal operation has no effect.
### Summary
- **Lookup** after an **insertion** either returns the newly inserted value or the value from the original associative array.
- **Lookup** in a new empty associative array fails, indicating the absence of any keys.
- **Remove** after an **insertion** either results in the original associative array without the key if the removed key is the same as the inserted key, or maintains the insertion while removing the specified key.
- **Remove** in a new empty associative array has no effect, leaving the array empty.
## Example
Consider a library's system for tracking which books are checked out by which patrons. Each book can be checked out by only one patron at a time, but a patron can check out multiple books. This can be efficiently represented using an associative array, where the keys are the book titles and the values are the patrons who have checked them out.
Let's use a Python or JSON-like notation to represent this associative array:
```json
{
"Pride and Prejudice": "Alice",
"Wuthering Heights": "Alice",
"Great Expectations": "John"
}
```
### Lookup Operation
If we perform a lookup operation for the key "Great Expectations", we retrieve the value associated with it, which is "John". This means John has checked out the book "Great Expectations":
```python
patron = library["Great Expectations"]
print(patron) # Output: "John"
```
### Deletion Operation
If John returns "Great Expectations", we need to remove this key-value pair from the associative array. The deletion operation updates the data structure to reflect that "Great Expectations" is no longer checked out by anyone:
```python
del library["Great Expectations"]
```
The updated associative array is now:
```json
{
"Pride and Prejudice": "Alice",
"Wuthering Heights": "Alice"
}
```
### Insertion Operation
If a new patron, Pat, checks out a new book, "The Brothers Karamazov", we perform an insertion operation to add this new key-value pair to the associative array:
```python
library["The Brothers Karamazov"] = "Pat"
```
The associative array now reflects the new state:
```json
{
"Pride and Prejudice": "Alice",
"Wuthering Heights": "Alice",
"The Brothers Karamazov": "Pat"
}
```
### Comprehensive Explanation
In this example:
1. **Initial State**: The associative array initially has three books checked out:
- "Pride and Prejudice" and "Wuthering Heights" are checked out by Alice.
- "Great Expectations" is checked out by John.
2. **Lookup Operation**: Performing `lookup("Great Expectations")` returns "John", indicating that John has checked out "Great Expectations".
3. **Deletion Operation**: When John returns "Great Expectations", we remove this entry from the associative array using `delete("Great Expectations")`. The updated array no longer includes "Great Expectations".
4. **Insertion Operation**: When Pat checks out "The Brothers Karamazov", we add this new entry to the associative array using `insert("The Brothers Karamazov", "Pat")`.
By using an associative array, the library system efficiently manages the check-out status of books, allowing for quick lookups, insertions, and deletions. This method ensures that each book is accurately tracked, and patrons' interactions with the library's inventory are easily managed.
## Implementation
Implementing a dictionary (associative array) can vary based on the size and characteristics of the dataset. Here are two straightforward implementation techniques: using an association list and using direct addressing.
### Association List
An association list is a simple implementation suitable for dictionaries with a small number of mappings. Here's how it works:
1. **Data Structure**: The dictionary is represented as a linked list, where each node contains a key-value pair (mapping).
2. **Insertion**: To insert a new key-value pair, you add a new node with the given key and value at the beginning (or end) of the list.
3. **Lookup**: To find the value associated with a key, you start at the beginning of the list and traverse each node, checking the key in each node until you find the desired key.
4. **Deletion**: To remove a key-value pair, you traverse the list to find the node with the key, then update the pointers to exclude that node from the list.
**Pros**:
- Simple to implement.
- Suitable for small dictionaries.
**Cons**:
- Lookup, insertion, and deletion operations have a linear time complexity (O(n)), where n is the number of mappings.
- Not efficient for large dictionaries due to the linear search time.
### Direct Addressing
Direct addressing is a technique used when keys are restricted to a narrow range. This method uses an array to store values, where the position in the array directly corresponds to a key. Here’s how it works:
1. **Data Structure**: An array is created with a size equal to the range of possible keys. Each position in the array represents a key, and the value at that position is the value associated with that key.
2. **Insertion**: To insert a key-value pair, you place the value in the array position corresponding to the key.
3. **Lookup**: To find the value associated with a key, you simply access the array position corresponding to the key.
4. **Deletion**: To remove a key-value pair, you set the array position corresponding to the key to a special sentinel value indicating the absence of a value.
**Pros**:
- Lookup, insertion, and deletion operations have constant time complexity (O(1)).
- Extremely fast due to direct access.
**Cons**:
- Requires a large amount of memory if the range of possible keys is large.
- Impractical if the key space is very sparse or large because of the excessive memory usage.
### Comparison
- **Association List**: Best for small dictionaries where the overhead of managing a list is acceptable. It's simple and has small constant factors in its running time, but operations can become slow as the dictionary grows.
- **Direct Addressing**: Best for scenarios where keys fall within a small, contiguous range, allowing for constant time operations. However, it becomes impractical if the key range is vast, as it requires a large array that could waste a lot of memory.
### Example Scenario
1. **Association List**:
- **Insertion**: Add a node with the key-value pair to the start of the linked list.
- **Lookup**: Traverse the list from the beginning, checking each node’s key until the target key is found.
- **Deletion**: Traverse the list to find the node with the target key, then update the list pointers to remove that node.
2. **Direct Addressing**:
- **Insertion**: Store the value at the array index corresponding to the key.
- **Lookup**: Directly access the array at the index of the key to retrieve the value.
- **Deletion**: Set the array element at the index of the key to a sentinel value indicating no value.
### Hash Table Implementations
The most frequently used general-purpose implementation of an associative array is with a hash table: an array combined with a hash function that separates each key into a separate "bucket" of the array. The basic idea behind a hash table is that accessing an element of an array via its index is a simple, constant-time operation. Therefore, the average overhead of an operation for a hash table is only the computation of the key's hash, combined with accessing the corresponding bucket within the array. As such, hash tables usually perform in O(1) time, and usually outperform alternative implementations.
Hash tables must be able to handle collisions: the mapping by the hash function of two different keys to the same bucket of the array. The two most widespread approaches to this problem are separate chaining and open addressing. In separate chaining, the array does not store the value itself but stores a pointer to another container, usually an association list, that stores all the values matching the hash. By contrast, in open addressing, if a hash collision is found, the table seeks an empty spot in an array to store the value in a deterministic manner, usually by looking at the next immediate position in the array.
Open addressing has a lower cache miss ratio than separate chaining when the table is mostly empty. However, as the table becomes filled with more elements, open addressing's performance degrades exponentially. Additionally, separate chaining uses less memory in most cases, unless the entries are very small (less than four times the size of a pointer).
**Core Idea:**
Imagine a large filing cabinet with numerous drawers labeled with numbers (buckets). A hash function acts like a super-fast sorting mechanism. It takes a key (like a person's name) and converts it into a unique number (drawer number) within a predefined range. This number is used to directly access the corresponding bucket in the cabinet (hash table array). Ideally, each key maps to a unique bucket, allowing for quick retrieval of its associated value stored in that bucket.
**Implementation Steps:**
1. **Define the Hash Table:**
- An array to store key-value pairs (buckets).
- A hash function that takes a key and returns a bucket index within the array's range.
2. **Adding a Key-Value Pair:**
- Calculate the hash index for the key using the hash function.
- Check the bucket at that index:
- If empty, store the key-value pair directly in that bucket.
- **Collision Resolution:** If the bucket is already occupied (collision!), a collision resolution strategy comes into play (explained later).
3. **Finding a Value:**
- Calculate the hash index for the key.
- Look at the bucket at that index.
- If it contains the exact key-value pair, return the value.
- **Collision Resolution:** If there's a collision, use the chosen strategy to find the key-value pair within the bucket or nearby locations (explained later).
4. **Removing a Key-Value Pair:**
- Calculate the hash index for the key.
- Find the key-value pair using the collision resolution strategy (similar to finding).
- Once located, remove the pair from the bucket.
**Collision Resolution Techniques:**
- **Separate Chaining:** Each bucket stores a linked list or another data structure to hold all key-value pairs that hashed to the same index. This offers flexibility but can increase memory usage.
- **Open Addressing:** If the bucket is full, the table probes for the next empty slot in the array following a predefined pattern (linear probing, quadratic probing, etc.). This is faster in terms of space but might lead to clustering of elements and slower access as the table fills up.
**Choosing the Right Method:**
Separate chaining is generally preferred for its memory efficiency and simpler implementation, especially for scenarios with a high fill factor (many elements in the table). Open addressing might be considered if memory is a tight constraint and the fill factor is expected to be low.
**Hash Function Design:**
A good hash function should distribute keys uniformly across the buckets to minimize collisions. Common techniques involve bitwise operations and mathematical manipulations on the key's data.
### Tree Implementations
Self-balancing binary search trees are another common approach to implementing an associative array, such as an AVL tree or a red–black tree.
Compared to hash tables, these structures have both strengths and weaknesses. The worst-case performance of self-balancing binary search trees is significantly better than that of a hash table, with a time complexity in big O notation of O(log n). This is in contrast to hash tables, whose worst-case performance involves all elements sharing a single bucket, resulting in O(n) time complexity. In addition, and like all binary search trees, self-balancing binary search trees keep their elements in order. Thus, traversing its elements follows a least-to-greatest pattern, whereas traversing a hash table can result in elements being in seemingly random order. Because they are in order, tree-based maps can also satisfy range queries (find all values between two bounds) whereas a hashmap can only find exact values. However, hash tables have a much better average-case time complexity than self-balancing binary search trees of O(1), and their worst-case performance is highly unlikely when a good hash function is used.
A self-balancing binary search tree can be used to implement the buckets for a hash table that uses separate chaining. This allows for average-case constant lookup but assures a worst-case performance of O(log n). However, this introduces extra complexity into the implementation and may cause even worse performance for smaller hash tables, where the time spent inserting into and balancing the tree is greater than the time needed to perform a linear search on all elements of a linked list or similar data structure.
**Strengths of Trees:**
- **Worst-Case Efficiency:** Tree operations like finding, adding, or removing elements have a worst-case time complexity of O(log n), where n is the number of elements. This is significantly better than the worst-case O(n) for hash tables that suffer from collisions.
- **Ordered Elements:** Unlike hash tables, trees inherently keep elements in a specific order (usually ascending or descending). This allows for efficient retrieval of elements within a specific range (range queries) – a feature not readily available with hash tables.
**Implementation (Conceptual):**
1. **Structure:** Imagine a binary tree where each node holds a key-value pair.
2. **Ordering:** Keys are compared during insertion to maintain the order property (e.g., left subtree contains keys less than the current node's key, right subtree contains greater keys).
3. **Self-Balancing:** Specific balancing rules (AVL or red-black) ensure the tree remains roughly balanced, meaning the height (number of levels) doesn't grow excessively with each insertion. This is crucial for maintaining efficient operations.
**Comparison with Hash Tables:**
- **Average Case:** Hash tables generally excel in average-case performance, with O(1) time complexity for most operations due to their direct bucket access using a hash function. This can be faster than tree operations, especially for smaller dictionaries.
- **Worst Case:** However, hash tables can suffer from collisions where multiple keys map to the same bucket, leading to a worst-case O(n) lookup time if the collision resolution strategy involves iterating through all elements in the bucket. Trees guarantee a worst-case of O(log n) even with unbalanced data.
**Hybrid Approach:**
- **Separate Chaining with Trees:** A self-balancing tree can be used as the underlying data structure for each bucket in a hash table that employs separate chaining. This approach offers the average-case efficiency of O(1) from hash tables with the worst-case guarantee of O(log n) from trees.
**Trade-offs:**
- **Complexity:** This hybrid approach adds complexity to the implementation compared to a basic hash table with linked lists.
- **Overhead for Smaller Tables:** For small dictionaries, the overhead of maintaining the tree's balance in the hybrid approach might outweigh the benefits. A simple linked list within each bucket might be more efficient.
**Choosing the Right Approach:**
The choice between trees and hash tables depends on your priorities:
- If **worst-case performance** is critical and you can tolerate a slightly slower average-case lookup, a self-balancing tree might be ideal.
- If **average-case speed** is paramount, and the worst-case scenario is less concerning with a good hash function, a hash table is generally preferred.
### Other Trees
Associative arrays may also be stored in unbalanced binary search trees or in data structures specialized to a particular type of keys such as radix trees, tries, Judy arrays, or van Emde Boas trees, though the relative performance of these implementations varies. For instance, Judy trees have been found to perform less efficiently than hash tables, while carefully selected hash tables generally perform more efficiently than adaptive radix trees, with potentially greater restrictions on the data types they can handle. The advantages of these alternative structures come from their ability to handle additional associative array operations, such as finding the mapping whose key is the closest to a queried key when the query is absent in the set of mappings.
### Comparison
| Underlying Data Structure | Lookup or Removal | Insertion | Ordered |
| --------------------------------------- | ----------------- | --------- | ------- |
| | Average | Worst Case | Average | Worst Case | |
| Hash table | O(1) | O(n) | O(1) | O(n) | No |
| Self-balancing binary search tree | O(log n) | O(log n) | O(log n)| O(log n) | Yes |
| Unbalanced binary search tree | O(log n) | O(n) | O(log n)| O(n) | Yes |
| Sequential container of key–value pairs (e.g. association list) | O(n) | O(n) | O(1) |
O(1) | No |
## Ordered Dictionary
While dictionaries typically focus on efficient key-value retrieval, some use cases require a specific order for iterating through the elements. This is where ordered dictionaries come in. There are two main interpretations of "ordered":
**1. Order based on Sorting Keys:**
- In this approach, the order of elements during iteration is determined by sorting the keys within the dictionary. This is similar to how elements in a tree-based implementation (e.g., C++ `<map>`) are presented.
- Whenever the dictionary is modified (adding, removing, or updating elements), the keys are potentially re-sorted to maintain the desired order.
**2. Order based on Insertion:**
- This is the more prevalent approach. The order of elements reflects the sequence in which they were added to the dictionary. This means the first element inserted is retrieved first during iteration, followed by the second, and so on.
- This insertion order is preserved even if elements are subsequently updated or removed.
**Implementation Techniques:**
Here are three common ways to implement ordered dictionaries:
1. **Association List:**
- This is a simple approach for small dictionaries. It uses a linked list where each node holds a key-value pair. New elements are added at the end, maintaining insertion order.
2. **Doubly Linked List on Top of a Regular Dictionary:**
- This technique combines a standard dictionary (like a hash table) for efficient key-based lookups with a doubly linked list. The linked list connects all the key-value pairs in the order they were inserted, regardless of their position in the underlying dictionary.
3. **Dense Insertion-Ordered Array:**
- This approach abandons the sparse (potentially unevenly filled) array structure of a traditional hash table. Instead, it uses a dense array where elements are stored consecutively based on insertion order. This offers efficient iteration but might require resizing the array as elements are added.
**Choosing the Right Approach:**
The best implementation for an ordered dictionary depends on factors like:
- **Expected size:** Association lists are suitable for small dictionaries.
- **Access patterns:** If frequent key-based lookups are needed, a hybrid approach with a dictionary and linked list might be beneficial.
- **Memory usage:** Dense arrays can be less memory-efficient compared to other methods, especially for frequently updated dictionaries.
## Language Support
Associative arrays can be implemented in any programming language as a package, and many language systems provide them as part of their standard library. In some languages, they are not only built into the standard system, but have special syntax, often using array-like subscripting.
Built-in syntactic support for associative arrays was introduced in 1969 by SNOBOL4, under the name "table". TMG offered tables with string keys and integer values. MUMPS made multi-dimensional associative arrays, optionally persistent, its key data structure. SETL supported them as one possible implementation of sets and maps. Most modern scripting languages, starting with AWK and including Rexx, Perl, PHP, Tcl, JavaScript, Maple, Python, Ruby, Wolfram Language, Go, and Lua, support associative arrays as a primary container type. In many more languages, they are available as library functions without special syntax.
In Smalltalk, Objective-C, .NET, Python, REALbasic, Swift, VBA and Delphi they are called dictionaries; in Perl, Ruby and Seed7 they are called hashes; in C++, C#, Java, Go, Clojure, Scala, OCaml, Haskell they are called maps (see map (C++), unordered_map (C++), and Map); in Common Lisp and Windows PowerShell, they are called hash tables (since both typically use this implementation); in Maple and Lua, they are called tables. In PHP, all arrays can be associative, except that the keys are limited to integers and strings. In JavaScript (see also JSON), all objects behave as associative arrays with string-valued keys, while the Map and WeakMap types take arbitrary objects as keys. In Lua, they are used as the primitive building block for all data structures. In Visual FoxPro, they are called Collections. The D language also supports associative arrays.
## Permanent Storage
Many programs using associative arrays will need to store that data in a more permanent form, such as a computer file. A common solution to this problem is a generalized concept known as archiving or serialization, which produces a text or binary representation of the original objects that can be written directly to a file. This is most commonly implemented in the underlying object model, like .Net or Cocoa, which includes standard functions that convert the internal data into text. The program can create a complete text representation of any group of objects by calling these methods, which are almost always already implemented in the base associative array class.
For programs that use very large data sets, this sort of individual file storage is not appropriate, and a database management system (DB) is required. Some DB systems natively store associative arrays by serializing the data and then storing that serialized data and the key. Individual arrays can then be loaded or saved from the database using the key to refer to them. These key–value stores have been used for many years and have a history as long as that of the more common relational database (RDBs), but a lack of standardization, among other reasons, limited their use to certain niche roles. RDBs were used for these roles in most cases, although saving objects to a RDB can be complicated, a problem known as object-relational impedance mismatch.
After approximately 2010, the need for high-performance databases suitable for cloud computing and more closely matching the internal structure of the programs using them led to a renaissance in the key–value store market. These systems can store and retrieve associative arrays in a native fashion, which can greatly improve performance in common web-related workflows.
## History and Evolution of Associative Arrays
The concept of associative arrays dates back to the early days of computing. Early examples include the use of symbol tables in compilers and interpreters, which are used to store information about program variables and other entities.
### Early Implementations
The first formal implementations of associative arrays were in high-level programming languages in the 1960s. SNOBOL4, developed in 1969, was one of the first languages to provide built-in associative arrays under the name "tables." Similarly, TMG offered tables with string keys and integer values, and MUMPS introduced multi-dimensional associative arrays.
### Growth in Popularity
As programming languages evolved, associative arrays became a common feature. The development of scripting languages in the 1980s and 1990s, such as AWK, Perl, and TCL, heavily utilized associative arrays due to their flexibility and ease of use in handling dynamic and unstructured data.
The 2000s saw associative arrays becoming a fundamental part of many programming languages, including Python, Ruby, PHP, and JavaScript. These languages provided built-in support for associative arrays, often with optimized implementations that offered efficient performance.
### Modern Implementations
In modern programming, associative arrays are ubiquitous. They are often referred to as dictionaries, maps, or hashes, depending on the language. Modern languages and frameworks have optimized their associative array implementations to handle large datasets efficiently and provide robust methods for serialization, iteration, and other operations.
### Associative Arrays in Databases
The rise of NoSQL databases has further cemented the importance of associative arrays. NoSQL databases like MongoDB, Redis, and DynamoDB use key-value pairs as their primary data model. This allows for highly scalable and flexible data storage solutions, catering to modern applications that require real-time processing and horizontal scalability.
## Advanced Usage and Techniques
### Complex Keys and Values
While traditional associative arrays use simple data types for keys (like integers or strings), more advanced implementations support complex keys. For example, in Python, the `frozenset` type can be used as a dictionary key, allowing for the creation of complex key structures.
Values in associative arrays can also be complex. They can be other associative arrays, leading to nested structures. This is particularly useful in representing JSON data structures or hierarchical data.
### Memory Efficiency
Efficient memory usage is critical in associative arrays, especially when dealing with large datasets. Techniques like open addressing and separate chaining in hash tables help manage memory effectively. Additionally, some languages and libraries implement memory pooling and garbage collection optimizations to minimize the overhead associated with associative arrays.
### Thread Safety and Concurrency
In multi-threaded applications, associative arrays can become a bottleneck if not managed properly. Concurrent implementations of associative arrays, like `ConcurrentHashMap` in Java, provide thread-safe operations. These implementations use techniques such as lock striping and non-blocking algorithms to ensure that multiple threads can access and modify the associative array concurrently without significant performance degradation.
### Persistent Associative Arrays
Persistent data structures retain their previous version after modifications. Persistent associative arrays are particularly useful in functional programming and versioned data storage systems. Languages like Clojure offer persistent hash maps, enabling efficient immutability.
### Use in Algorithms and Data Structures
Associative arrays are fundamental in various algorithms and data structures. They are used in caching (e.g., memoization), implementing sets, graphs (as adjacency lists), and in many more complex data structures like priority queues and indexed priority search queues.
## Practical Examples
### Web Development
Associative arrays are extensively used in web development. In JavaScript, objects are the primary way to represent and manipulate structured data, both on the client side and server side. They are used to handle JSON data, which is the de facto standard for data interchange in web applications.
### Configuration Management
In many software systems, configuration settings are managed using associative arrays. These settings are often stored in configuration files (e.g., JSON, YAML) and loaded into associative arrays for easy access and manipulation within the application.
### Data Analysis
In data analysis and scientific computing, associative arrays (often implemented as dictionaries or data frames) are used to store and manipulate large datasets. Libraries like Pandas in Python provide powerful tools for data manipulation, where the underlying data structure is often a dictionary of arrays.
## Associative Arrays in Distributed Systems
### Distributed Hash Tables (DHTs)
Distributed Hash Tables (DHTs) are a class of decentralized distributed systems that provide a lookup service similar to a hash table. Key-value pairs are stored in a distributed manner across multiple nodes. DHTs are designed to scale to large numbers of nodes and handle node arrivals, departures, and failures gracefully.
#### Key Concepts:
- **Chord**: One of the most well-known DHT implementations, which uses consistent hashing to distribute keys evenly across nodes and provides efficient lookup with logarithmic complexity.
- **Kademlia**: Another popular DHT implementation that uses XOR metric for distance measurement between keys, enabling efficient node lookup and self-organization.
### Key-Value Stores
Key-Value Stores are a type of NoSQL database that uses associative arrays as their primary data model. They are optimized for fast read and write operations and are often used in distributed systems to store large volumes of data.
#### Examples:
- **Amazon DynamoDB**: A fully managed key-value and document database that delivers single-digit millisecond performance at any scale. DynamoDB is designed to run high-performance, internet-scale applications.
- **Redis**: An open-source, in-memory key-value store that supports various data structures such as strings, hashes, lists, sets, and sorted sets. It is often used for caching, session management, and real-time analytics.
### Consistency Models
In distributed systems, maintaining consistency of associative arrays across multiple nodes is a significant challenge. Different consistency models are used to balance the trade-offs between performance, availability, and data consistency.
#### Types of Consistency Models:
- **Strong Consistency**: Guarantees that all nodes see the same data at the same time. Operations appear instantaneous and globally synchronized.
- **Eventual Consistency**: Guarantees that, given enough time, all nodes will converge to the same state. This model is often used in systems where high availability is more critical than immediate consistency.
- **Causal Consistency**: Ensures that operations that are causally related are seen by all nodes in the same order, while concurrent operations may be seen in different orders.
### Distributed Caching
Distributed caching involves storing key-value pairs in memory across multiple nodes to improve the performance of read-heavy applications. Associative arrays play a crucial role in caching mechanisms by providing fast access to frequently used data.
#### Technologies:
- **Memcached**: A high-performance, distributed memory caching system that is used to speed up dynamic web applications by alleviating database load.
- **Hazelcast**: An in-memory data grid that offers distributed caching, data partitioning, and replication for high scalability and resilience.
### Conflict Resolution
In distributed associative arrays, conflicts can occur when multiple nodes attempt to update the same key simultaneously. Various strategies are employed to resolve these conflicts:
#### Techniques:
- **Last-Write-Wins (LWW)**: A simple conflict resolution strategy where the most recent write operation is retained.
- **Vector Clocks**: A more sophisticated technique that tracks the history of changes to detect and resolve conflicts in a causally consistent manner.
- **Operational Transformation**: Used in collaborative environments, it allows concurrent edits to be merged in a consistent manner.
### Performance and Scalability
Performance and scalability are critical concerns in distributed associative arrays. Techniques such as sharding (partitioning data across multiple nodes), replication (duplicating data across nodes for redundancy), and load balancing (distributing workload evenly across nodes) are employed to ensure efficient and reliable operations.
### Use Cases
- **Content Delivery Networks (CDNs)**: Use distributed caching to store web content close to users, reducing latency and improving load times.
- **Big Data Analytics**: Key-value stores are used to store and retrieve large datasets efficiently, enabling real-time data processing and analysis.
- **Internet of Things (IoT)**: Associative arrays are used to manage device metadata, configurations, and state information in distributed IoT platforms.
### Challenges and Future Directions
The future of associative arrays in distributed systems includes addressing challenges such as improving consistency models, optimizing performance for large-scale deployments, and developing more robust conflict resolution techniques. Advancements in areas like edge computing, machine learning, and blockchain also present new opportunities for leveraging associative arrays in innovative ways.
## Conclusion
Associative arrays are a fundamental and versatile data structure in computer science, enabling efficient storage and retrieval of key-value pairs. Their wide adoption across programming languages and applications highlights their importance. From simple implementations in early programming languages to sophisticated, concurrent, and persistent versions in modern software, associative arrays continue to be a cornerstone of data manipulation and storage solutions. Understanding their implementation, performance characteristics, and use cases is crucial for any software developer or computer scientist.
## Example:
- [Rust](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.rs)
- [Ts](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.ts)
- [Js](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.js)
- [Java](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.java)
- [Python](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.py)
- [Golang](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Associative_Arrays/example/associative.go)
## Deepen Your Algorithmic Journey: A World of Discovery Awaits
Excited to delve deeper into the world of non-linear array addressing and beyond? My GitHub repository, **[Algorithms & Data Structures](https://github.com/m-mdy-m/algorithms-data-structures)**, offers a treasure trove of algorithms and data structures for you to explore.
**Experiment, Practice, and Master:**
* **Dive into:** A diverse collection of algorithms and data structures awaits your exploration, providing ample opportunity to practice, solidify your knowledge, and refine your understanding.
* **Continuous Growth:** While some sections are actively under development as part of my ongoing learning journey (estimated completion: 2-3 years), the repository is constantly expanding with new content.
**Let's Build a Community of Learners:**
The quest for knowledge doesn't end with exploration! I actively encourage feedback and collaboration. Encountered a challenge? Have a suggestion for improvement? Eager to discuss algorithms and performance optimization? Reach out and let's connect!
* **Join the Conversation:**
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* **GitHub:** [m-mdy-m](https://github.com/m-mdy-m)
**Together, let's build a vibrant learning community where we can share knowledge and push the boundaries of our understanding.** | m__mdy__m |
1,906,454 | AI in Educational Technology: Transforming Learning Experiences | Introduction The integration of Artificial Intelligence (AI) in the educational... | 27,673 | 2024-06-30T09:40:55 | https://dev.to/rapidinnovation/ai-in-educational-technology-transforming-learning-experiences-dpg | ## Introduction
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1,906,453 | Using Multiple DbContexts in a Single Query Execution | Introduction to DbContexts This article delves into how to manage and use multiple DbContexts in a... | 0 | 2024-06-30T09:34:05 | https://nilebits.com/blog/2024/06/multiple-dbcontexts-in-a-single-query/ | csharp, dotnet, microservices, oop | Introduction to DbContexts
This article delves into how to manage and use multiple DbContexts in a single query execution efficiently. We will explore various techniques, their pros and cons, and provide ample code examples to illustrate the concepts.
One well-liked Object-Relational Mapping (ORM) framework for.NET applications is called Entity Framework (EF). It removes the requirement for the majority of the data access code that developers typically have to write by enabling developers to interface with databases using.NET objects. The DbContext, a session with the database that can be used to query and save data, is the main idea behind Entity Framework.
In many applications, you might find yourself needing to interact with multiple databases. This can be due to various reasons such as microservices architecture, multiple data sources, or legacy systems. The challenge arises when you need to perform a single operation that spans multiple databases, each represented by its own DbContext.
Why Use Multiple DbContexts?
Before diving into the implementation details, let's understand the scenarios where multiple DbContexts might be necessary:
Microservices Architecture: In a microservices architecture, each service typically has its own database. When building a service that aggregates data from multiple services, you need to handle multiple DbContexts.
Multiple Data Sources: Sometimes, applications need to aggregate data from different databases, possibly even different types of databases (SQL Server, MySQL, PostgreSQL, etc.).
Legacy Systems: In scenarios where legacy systems are still in use, and you need to integrate them with newer systems, multiple DbContexts might be necessary to handle the different data sources.
Modular Applications: Large applications are often broken into modules, each with its own database for better maintainability and scalability.
Setting Up Multiple DbContexts
To work with multiple DbContexts, you first need to set up your Entity Framework models and contexts. Let's consider an example where we have two databases: SalesDb and HRDb.
Step 1: Define Your Entity Models
First, define the entities for each context. For example, SalesDb might have Customer and Order entities, while HRDb might have Employee and Department entities.
```
// SalesDb Entities
public class Customer
{
public int CustomerId { get; set; }
public string Name { get; set; }
public ICollection<Order> Orders { get; set; }
}
public class Order
{
public int OrderId { get; set; }
public int CustomerId { get; set; }
public DateTime OrderDate { get; set; }
public Customer Customer { get; set; }
}
// HRDb Entities
public class Employee
{
public int EmployeeId { get; set; }
public string Name { get; set; }
public int DepartmentId { get; set; }
public Department Department { get; set; }
}
public class Department
{
public int DepartmentId { get; set; }
public string DepartmentName { get; set; }
public ICollection<Employee> Employees { get; set; }
}
```
Step 2: Define Your DbContexts
Next, define the DbContexts for each database.
```
// SalesDbContext
public class SalesDbContext : DbContext
{
public DbSet<Customer> Customers { get; set; }
public DbSet<Order> Orders { get; set; }
public SalesDbContext(DbContextOptions<SalesDbContext> options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
// Fluent API configurations
}
}
// HRDbContext
public class HRDbContext : DbContext
{
public DbSet<Employee> Employees { get; set; }
public DbSet<Department> Departments { get; set; }
public HRDbContext(DbContextOptions<HRDbContext> options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
// Fluent API configurations
}
}
```
Configuring Dependency Injection
To use these DbContexts in your application, configure them in the Startup.cs (for ASP.NET Core applications).
```
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
// Configure SalesDbContext
services.AddDbContext<SalesDbContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("SalesDbConnection")));
// Configure HRDbContext
services.AddDbContext<HRDbContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("HRDbConnection")));
// Add other services
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
```
Querying with Multiple DbContexts
Let's explore different ways to query data using multiple DbContexts.
Method 1: Using Separate Context Instances
The simplest way to handle multiple DbContexts is to use them separately. This method involves querying each context independently and then combining the results.
```
public class MultiContextService
{
private readonly SalesDbContext _salesDbContext;
private readonly HRDbContext _hrDbContext;
public MultiContextService(SalesDbContext salesDbContext, HRDbContext hrDbContext)
{
_salesDbContext = salesDbContext;
_hrDbContext = hrDbContext;
}
public async Task<IEnumerable<EmployeeOrderInfo>> GetEmployeeOrderInfoAsync()
{
// Query SalesDbContext
var orders = await _salesDbContext.Orders.ToListAsync();
// Query HRDbContext
var employees = await _hrDbContext.Employees.Include(e => e.Department).ToListAsync();
// Combine the results
var employeeOrderInfo = from e in employees
join o in orders on e.EmployeeId equals o.CustomerId into eo
from order in eo.DefaultIfEmpty()
select new EmployeeOrderInfo
{
EmployeeName = e.Name,
Department = e.Department.DepartmentName,
OrderDate = order?.OrderDate
};
return employeeOrderInfo;
}
}
public class EmployeeOrderInfo
{
public string EmployeeName { get; set; }
public string Department { get; set; }
public DateTime? OrderDate { get; set; }
}
```
Method 2: Using a TransactionScope
When you need to ensure data consistency across multiple DbContexts, using a TransactionScope is a good approach. This allows you to wrap multiple database operations in a single transaction.
```
public async Task PerformTransactionalOperationAsync()
{
using (var transaction = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
try
{
// Perform operations on SalesDbContext
var customer = new Customer { Name = "John Doe" };
_salesDbContext.Customers.Add(customer);
await _salesDbContext.SaveChangesAsync();
// Perform operations on HRDbContext
var employee = new Employee { Name = "John Doe", DepartmentId = 1 };
_hrDbContext.Employees.Add(employee);
await _hrDbContext.SaveChangesAsync();
// Complete the transaction
transaction.Complete();
}
catch (Exception)
{
// Handle exceptions
throw;
}
}
}
```
Handling Complex Scenarios
Cross-Context Data Consistency
Ensuring data consistency across multiple DbContexts can be challenging. Using TransactionScope is one approach, but it might not always be sufficient, especially in distributed systems. In such cases, you might need to implement a two-phase commit or use a distributed transaction coordinator (DTC).
Performance Considerations
Querying multiple databases can have performance implications. It's essential to consider the performance impact and optimize your queries and data access patterns. Techniques such as caching, asynchronous operations, and minimizing the number of database calls can help improve performance.
Error Handling
Error handling becomes more complex when dealing with multiple DbContexts. Ensure you have robust error handling mechanisms in place to manage partial failures and maintain data consistency.
Advanced Techniques
Using Repository and Unit of Work Patterns
Implementing the repository and unit of work patterns can help manage multiple DbContexts more effectively. These patterns provide a clean abstraction over the data access layer and help in managing transactions and data consistency.
```
public interface IUnitOfWork : IDisposable
{
ISalesRepository SalesRepository { get; }
IHRRepository HRRepository { get; }
Task<int> SaveChangesAsync();
}
public class UnitOfWork : IUnitOfWork
{
private readonly SalesDbContext _salesDbContext;
private readonly HRDbContext _hrDbContext;
private ISalesRepository _salesRepository;
private IHRRepository _hrRepository;
public UnitOfWork(SalesDbContext salesDbContext, HRDbContext hrDbContext)
{
_salesDbContext = salesDbContext;
_hrDbContext = hrDbContext;
}
public ISalesRepository SalesRepository =>
_salesRepository ??= new SalesRepository(_salesDbContext);
public IHRRepository HRRepository =>
_hrRepository ??= new HRRepository(_hrDbContext);
public async Task<int> SaveChangesAsync()
{
using (var transaction = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
try
{
var salesResult = await _salesDbContext.SaveChangesAsync();
var
hrResult = await _hrDbContext.SaveChangesAsync();
transaction.Complete();
return salesResult + hrResult;
}
catch
{
// Handle exceptions
throw;
}
}
}
public void Dispose()
{
_salesDbContext?.Dispose();
_hrDbContext?.Dispose();
}
}
```
CQRS Pattern
The Command Query Responsibility Segregation (CQRS) pattern can also be beneficial when working with multiple DbContexts. It separates the read and write operations, which can be particularly useful for complex scenarios with multiple databases.
Conclusion
Using multiple DbContexts in a single query execution can be complex but is often necessary for modern applications dealing with multiple data sources. By understanding the scenarios where multiple DbContexts are needed and implementing the techniques discussed in this article, you can effectively manage and query data across multiple databases.
Key takeaways include:
Understanding the scenarios where multiple DbContexts are necessary.
Setting up and configuring multiple DbContexts.
Querying data using separate context instances and using TransactionScope for data consistency.
Handling complex scenarios and optimizing performance.
Implementing advanced techniques like repository and unit of work patterns and the CQRS pattern.
With these strategies, you can build robust and scalable applications that handle multiple data sources efficiently. | amr-saafan |
1,906,452 | Bootstrap vs. Tailwind CSS: Which CSS Framework is Best for Your Web Development Project? | Introduction When building websites, choosing the right CSS framework can make a big... | 0 | 2024-06-30T09:33:03 | https://dev.to/hamda_mohamed_8e071c7a84b/bootstrap-vs-tailwind-css-which-css-framework-is-best-for-your-web-development-project-19ej | ### Introduction
When building websites, choosing the right CSS framework can make a big difference. Two popular frameworks are Bootstrap and Tailwind CSS. This article will compare these two to help you decide which one fits your needs best. I'll also share what I expect from the HNG Internship.
### Bootstrap: The Classic Choice
**Overview**
Bootstrap, created by Twitter, is a well-known CSS framework. It offers a grid system, responsive design, and many ready-to-use components to help you build websites quickly.
**Key Features**
- **Responsive Grid System:** Makes it easy to create layouts that look good on any device.
- **Ready-to-use Components:** Includes elements like buttons, forms, and navigation bars.
- **Utility Classes:** Helps with tasks like spacing and text alignment.
- **Customization:** You can adjust its styles using Sass variables.
**Advantages and Drawbacks**
**Advantages:**
- **Easy to Use:** Great for beginners with its pre-built components.
- **Consistent Design:** Looks good on all devices.
- **Strong Community:** Lots of support and documentation.
- **Good Integration:** Works well with ReactJS and other frontend frameworks.
**Drawbacks:**
- **Large Size:** Includes many styles you might not use.
- **Hard to Customize:** Default styles can be difficult to change.
- **Similar Look:** Many websites look alike if styles aren’t customized.
### Tailwind CSS: The Modern Alternative
**Overview**
Tailwind CSS is a utility-first framework. It provides many small utility classes to help you style your HTML directly, allowing for great customization and control.
**Key Features**
- **Utility-First Approach:** Offers many utility classes for direct HTML styling.
- **Highly Customizable:** Adjust design easily through configuration files.
- **Optimized Performance:** Smaller CSS bundles by removing unused styles.
- **Great for Components:** Works well with frameworks like ReactJS.
**Advantages and Drawbacks**
**Advantages:**
- **Flexible Design:** Allows custom designs without writing extra CSS.
- **Better Performance:** Smaller bundles mean faster load times.
- **Consistent Patterns:** Encourages reusable design patterns.
- **Scales Well:** Good for large projects due to its modular nature.
**Drawbacks:**
- **Learning Curve:** Takes time to learn and set up.
- **Crowded HTML:** HTML files can become crowded with many classes.
- **Initial Setup:** Requires time and effort to configure.
### Comparison and Use Cases
**Performance:**
- **Bootstrap:** Great for fast development with many ready-to-use components.
- **Tailwind CSS:** Perfect for high performance and custom designs.
**Ease of Use:**
- **Bootstrap:** Ideal for beginners and quick setup.
- **Tailwind CSS:** Best for those who need detailed design control.
**Community and Ecosystem:**
- **Bootstrap:** Large community with lots of resources.
- **Tailwind CSS:** Growing support and resources.
### Expectations from the HNG Internship
I've been accepted into the HNG Internship, and I'm thrilled about this opportunity to improve my skills and work on real-world projects.
At HNG, I expect to:
- **Learn and Grow:** Gain hands-on experience with modern technologies.
- **Collaborate:** Work with talented developers and mentors to build innovative projects.
- **Develop Skills:** Improve my coding skills and learn best practices in frontend development.
ReactJS is a fantastic tool for creating dynamic and responsive web applications. I'm eager to dive deeper into its features and see how it integrates with CSS frameworks like Bootstrap and Tailwind CSS. My goal is to build impressive web applications and contribute meaningfully to the projects at HNG.
To learn more about the HNG Internship and the opportunities it offers, check out these links:
- [HNG Internship](https://hng.tech/internship)
- [HNG Premium](https://hng.tech/premium)
### Conclusion
Both Bootstrap and Tailwind CSS have their strengths. Bootstrap is great for quick, consistent design, while Tailwind CSS offers flexibility and performance.
Feel free to share your thoughts in the comments, and follow my journey through the HNG Internship for more insights and experiences in frontend development! | hamda_mohamed_8e071c7a84b | |
1,906,375 | How to add Favicons in Django (2024) | What is a favicon? According to W3C: A favicon is a small image displayed next to the page... | 0 | 2024-06-30T09:31:17 | https://dev.to/someab/how-to-add-favicons-in-django-2024-48da | django, favicon, html, tutorial | ## What is a favicon?
According to W3C: A favicon is a small image displayed next to the page title in the browser tab [More Info & Interactive Tool](https://www.w3schools.com/html/html_favicon.asp)
## How having a favicon helps?
A modern real world scenario is suppose you have a lot of tabs open in your browser (firefox, chrome, safari, etc) while you are multi-tasking on a typical day.
Notice (in the above given example) how the title shown on the tab becomes truncated because of lack of horizontal real estate. Because different websites have favicons that are usually unique to them, it is very easy for an end-user to visually tell them apart from each other.
Similarly, they also provide important context in other scenarios like
- While scrolling in 'Browser History'
- While viewing 'Search' results
## Favicons & their different file-formats/methods
In the image above, you can see the browser support for the .ico format started pretty early, while the latest addition to the club is the .svg format [More Info](https://en.wikipedia.org/wiki/Favicon#Image_file_format_support)
- Redundant Formats: **.gif, .apng, .jpeg, etc**
In short, don't use these formats, unless you have a very specific need for any of them
- New & Stable Formats: **.ico, .png, .svg & manifest.json**
In this tutorial, we will be focusing on these 3 formats/methods & they will be enough for you in 99% of use cases
## ICO Format
Created in the mid-1980s by Microsoft, this format is the defacto format for favicons. [More Info](https://en.wikipedia.org/wiki/ICO_(file_format))
_**Pros:** Backward Compatibility with very old browsers. Ability to contain multiple images in one file container_
_**Cons:** Can be slightly tricky for some people to edit/manipulate_
## PNG Format
PNG is, by far, one of the most commonly used image formats out there. [More Info](https://en.wikipedia.org/wiki/ICO_(file_format)#PNG_format)
_**Pros:** It has the Widest Acceptance across Devices & Browsers combined, plus 'Transparency' is supported
**Cons:**It is a Raster Graphic Format, hence the associated issues [More Info](https://youtu.be/-Fs2t6P5AjY?si=JEKFMtnETKzZdeMI)_
## SVG Format
Because it is Vector based, the quality remains sharp at all screen sizes
_**Pros:**Sharp Rendering, No Blurring, Automatic Variable Size_
_**Cons:** Can break backward compatibility on some devices (rare now)_
## Manifest (.json) Format
A web application manifest, defined in the Web Application Manifest specification, is a JSON text file that provides information about a web application
_**Pros:**Modularity_
_**Cons:** Can be a bit overwhelming to maintain for beginners_
## Implementation
So **first place the .ico, .png, .svg, & .json file in your static folder**(remember to run the Django 'collectstatic' commnd after that), then in your **base.html** (from which you will extend your other django html templates) add the following:
```html
{% load static %} {# required to load static content #}
<!doctype html>
<html>
<head>
{# ico format, Internet Explorer 9 or below compatible #}
<link rel="shortcut icon" href="{% static 'path/to/myicon.ico' %}">
{# ico format, modern with combined sizes #}
<link rel="icon" type="image/x-icon" href="{% static 'path/to/myicon.ico' %}" sizes="16x16 32x32 64x64">
{# png format with different sizes #}
<link rel="icon" type="image/png" href="{% static 'path/to/myicon_x32.png' %}" sizes="32x32">
<link rel="icon" type="image/png" href="{% static 'path/to/myicon_x192.png' %}" sizes="192x192">
{# png format for Apple touch compatibility #}
{# Size & Name of the image file matters #}
<link rel="apple-touch-icon" href="{% static 'path/to/apple-touch-icon.png' %}" size="180x180">
{# svg format, size doesn't matter since its a Vector Graphic Format #}
<link rel="icon" type="image/svg+xml" href="{% static 'path/to/myicon.svg' %}" sizes="any">
{# manifest format #}
<link rel="manifest" href="{% static 'path/to/manifest.json' %}" />
{# manifest format, alternative #}
<link rel="manifest" href="{% static 'path/to/app.webmanifest' %}" crossorigin="use-credentials" />
</head>
```
For the manifest method, you can just create a .json file with the following contents
```
{
"icons": [
{
"src": "path/to/favicon-192.png",
"type": "image/png",
"sizes": "192x192"
},
{
"src": "path/to/favicon-64.png",
"type": "image/png",
"sizes": "64x64"
}
]
}
```
## Closing Comments
As a beginner, just using a single .png format favicon should be enough for you in most situations. Rather, time & effort should be invested into other aspects of your web app other then what favicons to use
## Extra Reading
[More Info on the Html '<link>' Tag & its attributes](https://www.w3schools.com/tags/tag_link.asp)
[Apple Guidelines for Icons](https://developer.apple.com/design/human-interface-guidelines/app-icons)
[More Info on Manifest Format](https://developer.mozilla.org/en-US/docs/Web/Manifest)
[More Info on Django config](https://learndjango.com/tutorials/django-favicon-tutorial)
| someab |
1,893,024 | All of Reacts concepts- one article | React, developed by Facebook, has transformed web development with its component-based architecture... | 0 | 2024-06-30T09:30:36 | https://dev.to/albertjokelin/all-of-reacts-concepts-one-article-1ij9 | react, beginners, tutorial, webdev | React, developed by Facebook, has transformed web development with its component-based architecture and efficient rendering. However, mastering React requires a solid grasp of its core concepts.
In this comprehensive article, we'll explore all the essential aspects of React. Whether you're a beginner or an experienced developer, this guide covers everything from components and state management to hooks and lifecycle methods.
By the end, you'll have a thorough understanding of React's ecosystem and be ready to build sophisticated, maintainable applications.
## Components
A function that returns markup (JSX). Kind of like legos, basic building blocks of a react app.
```
function Profile() {
return (
<img
src="https://i.imgur.com/MK3eW3As.jpg"
alt="Katherine Johnson"
/>
);
}
export default function Gallery() {
return (
<section>
<h1>Amazing scientists</h1>
<Profile />
<Profile />
<Profile />
</section>
);
}
```
## Curly braces
Allows react to be dynamic by allowing values to pass through it.
```
<img
className="avatar"
src={avatar}
alt={description}
/>
```
## Fragments
An empty component is usually used as a parent container to return multiple components simultaneously.
```
<>
<ChildComponent />
</>
```
## Props
The parameters passed through containers. Anything can be a prop including other components (as children, known as composition).
A 'key' in props (similar to the primary key in SQL) is used to identify a component. Usually, it is the current index.
```
// Writing a function that supports props
function Avatar({ person, size }) {
return (
<img
className="avatar"
src={getImageUrl(person)}
alt={person.name}
width={size}
height={size}
/>
);
}
// Using props with the component
return (
<Avatar
person={{ name: 'Lin Lanying', imageId: '1bX5QH6' }}
size={100}
/>
);
```
## Rendering
Works by using a virtual DOM (VDOM). how does it work:
- State changed? update VDOM to reflect changes
- 'Diff'ing is performed: Check for changes between DOM and VDOM.
- 'Reconciliation' with the DOM is performed.
## Event Handling
Handles different events like onClick(), onChange(), and onSubmit().
## State
A snapshot of the app at any given point. We use special functions like useState and useReducer.
```
function Example() {
// Declare a new state variable, which we'll call "count"
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
```
## Controlled Components
Components used by a state to have a more predictable behaviour.
```
const [value, setValue] = useState('')
```
We change the state to change the behaviour.
## Hooks
It allows us to hook into features like state within function components. There are 5 types of hooks:
- State Hooks- useState, useReducer, to manage state
- Context Hooks- useContext, use data through context
- Ref Hooks- useRef, to reference HTML
- Effect Hooks- useEffect, Lets you connect to external systems and APIs.
- Performance Hooks- useMemo, useCallback, Boosts performance.
## Purity
Describes how react components should work (Like the one in Functional Programming). It follows two rules:
- Only return JSX
- Don't change stuff that existed before rendering
## Strict Mode
A component that detects problems during app development. Here's how to use it:
```
<StrictMode>
<App />
</StrictMode>
```
## Effects
Code that reaches outside the react application (like an API). Best done using event handlers or useEffect.
```
function ChatRoom({ roomId }) {
const [serverUrl, setServerUrl] = useState('https://localhost:1234');
useEffect(() => {
const connection = createConnection(serverUrl, roomId);
connection.connect();
return () => {
connection.disconnect();
};
}, [serverUrl, roomId]);
// ...
}
```
## Refs
Used to reference an element on DOM. Useful for tasks like focusing on an element.
```
export default function Counter() {
let ref = useRef(0);
function handleClick() {
ref.current = ref.current + 1;
alert('You clicked ' + ref.current + ' times!');
}
return (
<button onClick={handleClick}>
Click me!
</button>
);
}
```
## Context
Passing data without sending as props.
```
function Button() {
const theme = useContext(ThemeContext);
return <button className={theme} />;
}
```
## Portals
Context for components. Ideal for modals, dropdowns and tooltips.
```
<div>
<p>This child is placed in the parent div.</p>
{createPortal(
<p>This child is placed in the document body.</p>,
document.body
)}
</div>
```
## Suspense
Component to wait for something to load/occur. Provides a fallback UX till the other component is fetched/rendered.
```
<Suspense fallback={<Loading />}>
<SomeComponent />
</Suspense>
```
## Error Boundaries
Component to show a fallback component should that app encounter an error (like a 404 page).
```
export function MessageContainer({ messagePromise }) {
return (
<ErrorBoundary fallback={<p>⚠️Something went wrong</p>}>
<Suspense fallback={<p>⌛Downloading message...</p>}>
<Message messagePromise={messagePromise} />
</Suspense>
</ErrorBoundary>
);
}
function Message({ messagePromise }) {
const content = use(messagePromise);
return <p>Here is the message: {content}</p>;
}
```
References:
[React Dev](https://react.dev/) | albertjokelin |
1,906,449 | Tackling CORS Issues: My Backend Development Challenge and HNG Internship Journey | Introduction Backend development is a journey filled with challenges and triumphs.... | 0 | 2024-06-30T09:24:33 | https://dev.to/caleb_fadare/tackling-cors-issues-my-backend-development-challenge-and-hng-internship-journey-3a64 | backend, webdev | ## Introduction
Backend development is a journey filled with challenges and triumphs. Recently, while developing a recipe finder application, I encountered a significant roadblock: Cross-Origin Resource Sharing (CORS) issues. This blog post will explain how I overcame this problem and share my aspirations for the HNG Internship.
## The Problem
My recipe finder app needed to fetch data from the Spoonacular API, but the browser blocked these requests due to CORS policy restrictions. This issue prevented the app from displaying essential recipe data, rendering it ineffective.
## The Solution
To resolve the CORS issue, I implemented a proxy middleware in my React application. Here’s how I did it:
- Understanding CORS:
CORS is a security feature that prevents unauthorized requests to different domains. Understanding this was crucial to finding a solution.
- Setting Up http-proxy-middleware: I installed http-proxy-middleware in my React
```
project:npm install http-proxy-middleware --save
```
I then created a setupProxy.js file in the src directory and configured the proxy:
```
const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
app.use(
'/api',
createProxyMiddleware({
target: 'https://api.spoonacular.com',
changeOrigin: true,
pathRewrite: { '^/api': '' },
})
);
};
```
- Updating API Calls: I updated my API calls to use the proxy:
```
import axios from 'axios';
const BASE_URL = '/api/recipes/';
export const fetchRecipes = async (ingredients) => {
try {
const response = await axios.get(`${BASE_URL}findByIngredients`, {
params: {
ingredients,
apiKey: 'your_spoonacular_api_key',
},
});
return response.data;
} catch (error) {
console.error('Error fetching recipes:', error);
return [];
}
};
```
- Testing: After configuring the proxy and updating the API calls, I tested the application thoroughly. The CORS issue was resolved, and the app successfully fetched and displayed the recipe data.
## My Journey with the HNG Internship
I am excited to start my journey with the HNG Internship. The program offers hands-on experience and mentorship in software development, aligning perfectly with my career goals. Through the internship, I aim to enhance my skills, build a robust portfolio, and connect with industry experts.The HNG Internship emphasizes real-world projects and practical experience, bridging the gap between theoretical knowledge and industry requirements. This structured environment will allow me to apply my knowledge, learn new technologies, and collaborate with like-minded individuals.
## Why I Want to Do the HNG Internship
The HNG Internship provides an invaluable platform to develop technical skills and gain insights into the tech industry. The mentorship and feedback from experienced developers will be crucial in shaping my career. I am eager to tackle new challenges, contribute to meaningful projects, and grow as a developer.
## Conclusion
Solving the CORS issue in my recipe finder application was a significant milestone in my backend development journey. It reinforced the importance of perseverance and problem-solving. As I continue this journey with the HNG Internship, I am motivated to tackle new challenges and make meaningful contributions to the tech community.For more information about the HNG Internship and the opportunities it offers, visit [HNG Internship](https://hng.tech/internship) and [HNG Hire](https://hng.tech/hire).
Thank you for reading, and I look forward to sharing more of my experiences as I progress through the HNG Internship!
| caleb_fadare |
1,906,424 | Avoid the Chaos: How to Properly Manage Python Packages with Virtual Environments | Managing environments In embarking on projects, I've learned the hard way that starting... | 0 | 2024-06-30T09:23:22 | https://matteospanio.github.io/blog/2024/python-environments/ | python, programming, productivity, development | ## Managing environments
In embarking on projects, I've learned the hard way that starting without the right tools can lead to wasted time and frustration. This has been evident in my tendency to recklessly install packages, turning my system's Python environment into a chaotic mess. Despite the availability of better alternatives, I've also stuck with the default Python shell. Investing upfront time and effort to avoid these pitfalls can greatly benefit your journey as a Python enthusiast.
While most programming languages provide a standard library with diverse functionalities, managing additional libraries can be challenging. It's crucial to effectively utilize the standard library, which includes features like file handling, string manipulation, and date/time management. However, to fully leverage Python's capabilities, additional libraries are often required. Python's vibrant developer community produces a plethora of third-party packages, allowing for quick and easy installation. Yet, it's essential to exercise caution and avoid the temptation to install every intriguing package, as it can lead to a chaotic environment where nothing functions properly.
With this understanding, let's delve into pip, the default package manager tool that accompanies Python installation.
## pip and virtual environments
`pip` is Python's package manager. Its name is a recursive acronym that stands for *Pip Installs Packages*. `pip` is a powerful tool that allows you to install, upgrade, and remove additional libraries, and it is included in Python installation starting from version 3.4.
> ##### Legacy Python
> If you are using an older version of Python, you can install pip manually. To do so, simply download the `get-pip.py` file from the official Python website at [https://bootstrap.pypa.io/get-pip.py](https://bootstrap.pypa.io/get-pip.py) and run it with Python.
### Installing packages
To install a Python package using pip, simply use the install command followed by the name of the package. For example, to install the requests package, which is commonly used for making HTTP requests, you would type:
```bash
pip install requests
```
pip will then download and install the [requests package ](https://docs.python-requests.org/en/latest/index.html) and any dependencies it requires.
Now that you have installed requests, you can use it in your Python code by importing it as usual:
```python
import requests
response = requests.get('https://www.example.com')
print(response.text)
```
To uninstall a package that you no longer need, you can use the uninstall command followed by the name of the package. For example, to uninstall the requests package, you would type:
```bash
pip uninstall requests
```
As you can see, pip is a simple and straightforward tool for managing Python packages. However, it has one major limitation: it installs packages **globally**, which can lead to conflicts between different projects that require different versions of the same package.
To avoid these conflicts, it is best to use **virtual environments**. A virtual environment is an isolated environment that contains its own Python interpreter and its own set of installed packages. This allows you to work on multiple projects with different dependencies without worrying about conflicts. Python provides a built-in module called [venv](https://docs.python.org/3/library/venv.html) that allows you to create and manage virtual environments. To create a new virtual environment, you can use the following command:
```{bash}
python -m venv myenv
```
This will create a new directory called `myenv` that contains a copy of the Python interpreter and a copy of the `pip` package manager.
Let's look in detail at the folder structure of the virtual environment with the shell utility `tree`:
```bash
$ tree -L 4 myenv
myenv
├── bin
│ ├── activate
│ ├── activate.csh
│ ├── activate.fish
│ ├── Activate.ps1
│ ├── pip
│ ├── pip3
│ ├── pip3.10
│ ├── python -> python3
│ ├── python3 -> /usr/bin/python3
│ └── python3.10 -> python3
├── include
├── lib
│ └── python3.10
│ └── site-packages
│ ├── _distutils_hack
│ ├── distutils-precedence.pth
│ ├── pip
│ ├── pip-22.0.2.dist-info
│ ├── pkg_resources
│ ├── setuptools
│ └── setuptools-59.6.0.dist-info
├── lib64 -> lib
└── pyvenv.cfg
```
As you can see the `bin` directory contains the `activate` script that allows you to activate the virtual environment. The `lib` directory contains the installed packages, and the `include` directory contains the header files needed to compile C extensions. The `pyvenv.cfg` file contains the configuration of the virtual environment.
To activate the virtual environment, you can use the following command:
```bash
source myenv/bin/activate
```
This will activate the virtual environment, and you will see the name of the virtual environment in your shell prompt.
> ##### TIP
> On Windows, the command to activate the virtual environment is slightly different:
> ```{bash}
> myenv\Scripts\activate
> ```
Once the virtual environment is activated, any packages you install using `pip` will be installed in the virtual environment rather than globally. This allows you to work on your project without worrying about conflicts with other projects.
For example, to install the requests package in the virtual environment, you would type:
```bash
pip install requests
```
but this time the package will be installed in the `myenv` directory rather than globally. In fact if you look at the `lib` directory of the virtual environment you will see the installed packages:
```bash
$ tree -L 1 myenv/lib/python3.10/site-packages
myenv/lib/python3.10/site-packages
├── certifi
├── certifi-2024.6.2.dist-info
├── charset_normalizer
├── charset_normalizer-3.3.2.dist-info
├── _distutils_hack
├── distutils-precedence.pth
├── idna
├── idna-3.7.dist-info
├── pip
├── pip-22.0.2.dist-info
├── pkg_resources
├── requests
├── requests-2.32.3.dist-info
├── setuptools
├── setuptools-59.6.0.dist-info
├── urllib3
└── urllib3-2.2.2.dist-info
```
When you are finished working on your project, you can deactivate the virtual environment using the following command:
```bash
deactivate
```
This will return you to the global Python environment.
### Managing requirements
When working on a project, it is common to have a list of required packages that need to be installed. This list is often stored in a file called `requirements.txt`, which can be used to install all the required packages at once. To create a `requirements.txt` file, you can use the following command:
```{bash}
pip freeze > requirements.txt
```
This will create a `requirements.txt` file that contains a list of all the packages installed in the current environment. To install the packages listed in a `requirements.txt` file, you can use the following command:
```{bash}
pip install -r requirements.txt
```
This will install all the packages listed in the `requirements.txt` file.
## pipx
Sometimes, you may want to install a Python application that is not a library, but a standalone program. In this case, you can use `pipx`. `pipx` is a tool that allows you to install and manage Python applications in an isolated environment. This means that when you install an application with `pipx`, it is not installed in the system, but in a dedicated virtual environment. This allows you to avoid conflicts between different versions of libraries and keep your system clean.
```{bash}
pipx install <package_name>
```
To uninstall a package installed with `pipx`, you can use the following command:
```{bash}
pipx uninstall <package_name>
```
It is important to note that `pipx` is not a replacement for `pip`. It is a complementary tool that is used specifically for installing and managing Python applications. If you want to install a library, you should use `pip` instead. `pipx` is particularly useful for installing command-line tools that are written in Python, such as `black`, `flake8`, `isort`, and many others that you will likely to use transversally in your projects.
## conda
`conda` is an open-source package management system and environment management system that runs on Windows, macOS, and Linux. It is a powerful tool that allows you to create and manage virtual environments, install and update packages, and manage dependencies. `conda` is particularly popular in the scientific computing community, as it provides access to a wide range of scientific computing libraries and tools. I suggest to have a look at the official documentation at [https://docs.conda.io/en/latest/](https://docs.conda.io/en/latest/) to get started with `conda`. An important thing to note is that `conda` has its own way to install packages through the `conda install` command, which is different from `pip`. This is because `conda` manages its own package repositories, which are separate from the Python Package Index (PyPI). This means that some packages may be available on `conda` but not on PyPI, and vice versa, anyway `conda` can install packages from PyPI as well using the `pip` package manager.
`conda` solves the virtual environment problem its own way, it lets you create and activate virtual environments creating them for you. When you install `conda` for the first time it comes with a default virtual environment called `base`. As stated before a good practice is to create a virtual environment for each project, anyway the `conda` design encourages you to reuse a virtual environment. For example, you can create a virtual environment called `torch` and install the `torch` package in it, then you can create another virtual environment called `tensorflow` and install the `tensorflow` package in it. This way you can switch between the two environments when you need to work on a project that requires `torch` or `tensorflow`. This is a different approach from `venv` where you create a new virtual environment for each project. If you find yourself working on multiple projects that require the same set of packages, `conda` can be a good choice for you.
## poetry & friends
`poetry` is a tool for dependency management and packaging in Python. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you. It also allows you to specify the Python version and the Python interpreter to use. `poetry` is particularly popular in the data science community, as it provides a simple and powerful way to manage dependencies and package your projects. This tool is really similar to `npm` in the JavaScript world, or `cargo` in the Rust world, and it is a great way to manage your Python projects. You can find more information about `poetry` at [https://python-poetry.org/](https://python-poetry.org/).
One of the most interesting features of `poetry`, in my opinion, is the fact that you are *enforced* to organize your project in a specific way. This is because `poetry` expects your project to have a specific structure, with a `pyproject.toml` file that contains the project's metadata and dependencies. This makes it easier to manage your project and share it with others, as they will know exactly where to find the project's dependencies and how to install them.
`poetry` is not the only tool in this category. Other popular tools include `pipenv` and `pip-tools`. Each of these tools has its own strengths and weaknesses, and the best tool for you will depend on your specific needs and preferences.
| matteospanio |
1,906,426 | Cells with Odd Values in a Matrix(LeetCode-easy) | INTRODUCTION We, have given two array one is main array matrix and other is indices[is a... | 26,929 | 2024-06-30T09:18:08 | https://dev.to/rifat87/cells-with-odd-values-in-a-matrix-2ikh | leetcode, problem, dsa, java | #INTRODUCTION
We, have given two array one is main array matrix and other is indices[is a 2D array]. Each indices value consist two things one is row value and another is column value, indices[i] = [ri, ci]. And our task is to simply increment by 1 the whole row and whole column.
**NOTE**: Because indices is 2D array, so we can easily get the row value using row = indices[i][0] , and the column value using col = indices[i][1]
#Examples
#Hints
---
##Steps
1. Create an array of size m, n
2. Set the row value and col value from indices
3. Increment the whole row and col by 1
4. Check the main matrix values for **ODD** number.
5. Return the counter.
##Java Code
```
class Solution {
public int oddCells(int m, int n, int[][] indices) {
int[][] mat = new int[m][n];
for (int i = 0; i < indices.length; i++) {
int row = indices[i][0];
int col = indices[i][1];
for (int j = 0; j <n; j++) {
mat[row][j]++;
}
for (int j = 0; j <m; j++) {
mat[j][col]++;
}
}
int count = 0;
for (int i = 0; i <m; i++) {
for (int j = 0; j < n; j++) {
if(mat[i][j] % 2 != 0){
count++;
}
}
}
return count;
}
}
```
##Output
| rifat87 |
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Buy Verified Paxful Account.\n\nThis brings us to the question: is it safe to purchase Paxful Verified Accounts? Top Paxful reviews offer mixed opinions, suggesting that caution should be exercised. Therefore, users are advised to conduct thorough research and consider all aspects before proceeding with any transactions on Paxful.\n\n \n\nHow Do I Get 100% Real Verified Paxful Accoun?\nPaxful, a renowned peer-to-peer cryptocurrency marketplace, offers users the opportunity to conveniently buy and sell a wide range of cryptocurrencies. Given its growing popularity, both individuals and businesses are seeking to establish verified accounts on this platform.\n\nHowever, the process of creating a verified Paxful account can be intimidating, particularly considering the escalating prevalence of online scams and fraudulent practices. This verification procedure necessitates users to furnish personal information and vital documents, posing potential risks if not conducted meticulously.\n\nIn this comprehensive guide, we will delve into the necessary steps to create a legitimate and verified Paxful account. Our discussion will revolve around the verification process and provide valuable tips to safely navigate through it.\n\nMoreover, we will emphasize the utmost importance of maintaining the security of personal information when creating a verified account. Furthermore, we will shed light on common pitfalls to steer clear of, such as using counterfeit documents or attempting to bypass the verification process.\n\nWhether you are new to Paxful or an experienced user, this engaging paragraph aims to equip everyone with the knowledge they need to establish a secure and authentic presence on the platform.\n\nBenefits Of Verified Paxful Accounts\nVerified Paxful accounts offer numerous advantages compared to regular Paxful accounts. One notable advantage is that verified accounts contribute to building trust within the community.\n\nVerification, although a rigorous process, is essential for peer-to-peer transactions. This is why all Paxful accounts undergo verification after registration. When customers within the community possess confidence and trust, they can conveniently and securely exchange cash for Bitcoin or Ethereum instantly. Buy Verified Paxful Account.\n\nPaxful accounts, trusted and verified by sellers globally, serve as a testament to their unwavering commitment towards their business or passion, ensuring exceptional customer service at all times. Headquartered in Africa, Paxful holds the distinction of being the world’s pioneering peer-to-peer bitcoin marketplace. Spearheaded by its founder, Ray Youssef, Paxful continues to lead the way in revolutionizing the digital exchange landscape.\n\nPaxful has emerged as a favored platform for digital currency trading, catering to a diverse audience. One of Paxful’s key features is its direct peer-to-peer trading system, eliminating the need for intermediaries or cryptocurrency exchanges. By leveraging Paxful’s escrow system, users can trade securely and confidently.\n\nWhat sets Paxful apart is its commitment to identity verification, ensuring a trustworthy environment for buyers and sellers alike. With these user-centric qualities, Paxful has successfully established itself as a leading platform for hassle-free digital currency transactions, appealing to a wide range of individuals seeking a reliable and convenient trading experience. Buy Verified Paxful Account.\n\n \n\nHow paxful ensure risk-free transaction and trading?\nEngage in safe online financial activities by prioritizing verified accounts to reduce the risk of fraud. Platforms like Paxfu implement stringent identity and address verification measures to protect users from scammers and ensure credibility.\n\nWith verified accounts, users can trade with confidence, knowing they are interacting with legitimate individuals or entities. By fostering trust through verified accounts, Paxful strengthens the integrity of its ecosystem, making it a secure space for financial transactions for all users. Buy Verified Paxful Account.\n\nExperience seamless transactions by obtaining a verified Paxful account. Verification signals a user’s dedication to the platform’s guidelines, leading to the prestigious badge of trust. This trust not only expedites trades but also reduces transaction scrutiny. Additionally, verified users unlock exclusive features enhancing efficiency on Paxful. Elevate your trading experience with Verified Paxful Accounts today.\n\nIn the ever-changing realm of online trading and transactions, selecting a platform with minimal fees is paramount for optimizing returns. This choice not only enhances your financial capabilities but also facilitates more frequent trading while safeguarding gains. Buy Verified Paxful Account.\n\nExamining the details of fee configurations reveals Paxful as a frontrunner in cost-effectiveness. Acquire a verified level-3 USA Paxful account from usasmmonline.com for a secure transaction experience. Invest in verified Paxful accounts to take advantage of a leading platform in the online trading landscape.\n\n \n\nHow Old Paxful ensures a lot of Advantages?\n\nExplore the boundless opportunities that Verified Paxful accounts present for businesses looking to venture into the digital currency realm, as companies globally witness heightened profits and expansion. These success stories underline the myriad advantages of Paxful’s user-friendly interface, minimal fees, and robust trading tools, demonstrating its relevance across various sectors.\n\nBusinesses benefit from efficient transaction processing and cost-effective solutions, making Paxful a significant player in facilitating financial operations. Acquire a USA Paxful account effortlessly at a competitive rate from usasmmonline.com and unlock access to a world of possibilities. Buy Verified Paxful Account.\n\nExperience elevated convenience and accessibility through Paxful, where stories of transformation abound. Whether you are an individual seeking seamless transactions or a business eager to tap into a global market, buying old Paxful accounts unveils opportunities for growth.\n\nPaxful’s verified accounts not only offer reliability within the trading community but also serve as a testament to the platform’s ability to empower economic activities worldwide. Join the journey towards expansive possibilities and enhanced financial empowerment with Paxful today. Buy Verified Paxful Account.\n\n \n\nWhy paxful keep the security measures at the top priority?\nIn today’s digital landscape, security stands as a paramount concern for all individuals engaging in online activities, particularly within marketplaces such as Paxful. It is essential for account holders to remain informed about the comprehensive security protocols that are in place to safeguard their information.\n\nSafeguarding your Paxful account is imperative to guaranteeing the safety and security of your transactions. Two essential security components, Two-Factor Authentication and Routine Security Audits, serve as the pillars fortifying this shield of protection, ensuring a secure and trustworthy user experience for all. Buy Verified Paxful Account.\n\nConclusion\nInvesting in Bitcoin offers various avenues, and among those, utilizing a Paxful account has emerged as a favored option. Paxful, an esteemed online marketplace, enables users to engage in buying and selling Bitcoin. Buy Verified Paxful Account.\n\nThe initial step involves creating an account on Paxful and completing the verification process to ensure identity authentication. Subsequently, users gain access to a diverse range of offers from fellow users on the platform. Once a suitable proposal captures your interest, you can proceed to initiate a trade with the respective user, opening the doors to a seamless Bitcoin investing experience.\n\nIn conclusion, when considering the option of purchasing verified Paxful accounts, exercising caution and conducting thorough due diligence is of utmost importance. It is highly recommended to seek reputable sources and diligently research the seller’s history and reviews before making any transactions.\n\nMoreover, it is crucial to familiarize oneself with the terms and conditions outlined by Paxful regarding account verification, bearing in mind the potential consequences of violating those terms. By adhering to these guidelines, individuals can ensure a secure and reliable experience when engaging in such transactions. Buy Verified Paxful Account.\n\n \n\nContact Us / 24 Hours Reply\nTelegram:dmhelpshop\nWhatsApp: +1 (980) 277-2786\nSkype:dmhelpshop\nEmail:dmhelpshop@gmail.com" | narofa1781 |
1,906,412 | Node.js Asynchronous Architecture | Node.js is single threaded and operates asynchronously using the "Single Threaded Event Loop"... | 0 | 2024-06-30T08:48:05 | https://dev.to/tofail/how-nodejs-handl-multiple-task-being-single-threaded-3lh7 | node, javascript, webdev | Node.js is single threaded and operates asynchronously using the "Single Threaded Event Loop" architecture and handles multiple concurrent clients efficiently without multithreading. Node.js is actually designed to build distributed applications with many nodes and that's the reason why it's called Node. Actually, the main event loop is single threaded but Node.js uses multiple threads in the background to execute asynchronous code.
Node.js is non-blocking which means that all the callbacks or functions are delegated to the event loop and are executed by different threads. This means that when other processes are executing in a concurrent manner, the event loop continues to run as non-JavaScript operations. This way the tasks are executed asynchronously.
Needless to say that Node.js is extremely good at handling multiple requests concurrently using a single thread model. This is called "asynchronous cooperative multitasking".
**Management of asynchronous code in Node.js:**
A lot of times we have dealt with multithreading and preemptive multitasking scenarios but the first time we encountered cooperative multitasking using Node.js was when creating a User Module at the earlier stage of our product creation.
This module deals with managing different user roles and permissions and consolidates the respective entitlement of users of different levels (like Admin and User). We understood that asynchronous code in Node.js can be handled in 3 possible ways:
**1.Callbacks:** Callback is an executable code that is passed as an argument to another code and is expected to execute (or call back) at a specific time. Callbacks make sure that certain code doesn't execute until another code is finished its execution.
**2.Using Async/Await with Promises:** The async/await pattern structures an asynchronous, non-blocking function similar to a synchronous function. It provides opportunities to the program to execute other code while waiting for a long-running asynchronous task to complete. The await keyword within the async function returns a promise value that ensures the current function is completed before calling the subsequent function.
**3.Using Promises:** Promises are abstractions provided that give us a way to express ourselves synchronously when writing asynchronous code. A promise returns a value that is either resolved or the reason why that's not resolved (for example, when a network error occurs).
A promise can be in any one of the following states:
**States of a Promise**
**Pending:** async operation is incomplete and promise does not have a value yet.
**Fullfilled:** async operation is completed and promise has a value.
**Rejected:** async operation has failed and promise will never get fulfilled.
| tofail |
1,906,417 | Seek a business partner that pays well | If you can create a large number of Google vocie accounts, please contact me. We also need a large... | 0 | 2024-06-30T08:56:16 | https://dev.to/jest_ferreira_d2c4636a915/seek-a-business-partner-that-pays-well-4im | If you can create a large number of Google vocie accounts, please contact me. We also need a large number of other social accounts such as Europe, America, South Korea, Japan, etc., including Facebook, Twitter, LinkedIn, index, etc. We will pay you handsomely, and all accounts will be used for charitable business promotion. Please contact my telegram account @tu2023cc | jest_ferreira_d2c4636a915 | |
1,906,416 | Buy Verified Paxful Account | https://dmhelpshop.com/product/buy-verified-paxful-account/ Buy Verified Paxful Account There are... | 0 | 2024-06-30T08:56:07 | https://dev.to/revojop836/buy-verified-paxful-account-1p0m | webdev, javascript, beginners, programming | ERROR: type should be string, got "https://dmhelpshop.com/product/buy-verified-paxful-account/\n\n\nBuy Verified Paxful Account\nThere are several compelling reasons to consider purchasing a verified Paxful account. Firstly, a verified account offers enhanced security, providing peace of mind to all users. Additionally, it opens up a wider range of trading opportunities, allowing individuals to partake in various transactions, ultimately expanding their financial horizons.\n\nMoreover, Buy verified Paxful account ensures faster and more streamlined transactions, minimizing any potential delays or inconveniences. Furthermore, by opting for a verified account, users gain access to a trusted and reputable platform, fostering a sense of reliability and confidence.\n\nLastly, Paxful’s verification process is thorough and meticulous, ensuring that only genuine individuals are granted verified status, thereby creating a safer trading environment for all users. Overall, the decision to Buy Verified Paxful account can greatly enhance one’s overall trading experience, offering increased security, access to more opportunities, and a reliable platform to engage with. Buy Verified Paxful Account.\n\nBuy US verified paxful account from the best place dmhelpshop\nWhy we declared this website as the best place to buy US verified paxful account? Because, our company is established for providing the all account services in the USA (our main target) and even in the whole world. With this in mind we create paxful account and customize our accounts as professional with the real documents. 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As a result, the concept of a verified account has gained immense significance, serving as a critical feature for numerous online platforms. Paxful recognizes this need and provides a safe haven for users, streamlining their cryptocurrency buying and selling experience.\n\nFor individuals and businesses alike, Buy verified Paxful account emerges as an appealing choice, offering a secure and reliable environment in the ever-expanding world of digital transactions. Buy Verified Paxful Account.\n\nVerified Paxful Accounts are essential for establishing credibility and trust among users who want to transact securely on the platform. They serve as evidence that a user is a reliable seller or buyer, verifying their legitimacy.\n\nBut what constitutes a verified account, and how can one obtain this status on Paxful? 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Buy Verified Paxful Account.\n\nThis brings us to the question: is it safe to purchase Paxful Verified Accounts? Top Paxful reviews offer mixed opinions, suggesting that caution should be exercised. Therefore, users are advised to conduct thorough research and consider all aspects before proceeding with any transactions on Paxful.\n\n \n\nHow Do I Get 100% Real Verified Paxful Accoun?\nPaxful, a renowned peer-to-peer cryptocurrency marketplace, offers users the opportunity to conveniently buy and sell a wide range of cryptocurrencies. Given its growing popularity, both individuals and businesses are seeking to establish verified accounts on this platform.\n\nHowever, the process of creating a verified Paxful account can be intimidating, particularly considering the escalating prevalence of online scams and fraudulent practices. This verification procedure necessitates users to furnish personal information and vital documents, posing potential risks if not conducted meticulously.\n\nIn this comprehensive guide, we will delve into the necessary steps to create a legitimate and verified Paxful account. Our discussion will revolve around the verification process and provide valuable tips to safely navigate through it.\n\nMoreover, we will emphasize the utmost importance of maintaining the security of personal information when creating a verified account. Furthermore, we will shed light on common pitfalls to steer clear of, such as using counterfeit documents or attempting to bypass the verification process.\n\nWhether you are new to Paxful or an experienced user, this engaging paragraph aims to equip everyone with the knowledge they need to establish a secure and authentic presence on the platform.\n\nBenefits Of Verified Paxful Accounts\nVerified Paxful accounts offer numerous advantages compared to regular Paxful accounts. One notable advantage is that verified accounts contribute to building trust within the community.\n\nVerification, although a rigorous process, is essential for peer-to-peer transactions. This is why all Paxful accounts undergo verification after registration. When customers within the community possess confidence and trust, they can conveniently and securely exchange cash for Bitcoin or Ethereum instantly. Buy Verified Paxful Account.\n\nPaxful accounts, trusted and verified by sellers globally, serve as a testament to their unwavering commitment towards their business or passion, ensuring exceptional customer service at all times. Headquartered in Africa, Paxful holds the distinction of being the world’s pioneering peer-to-peer bitcoin marketplace. Spearheaded by its founder, Ray Youssef, Paxful continues to lead the way in revolutionizing the digital exchange landscape.\n\nPaxful has emerged as a favored platform for digital currency trading, catering to a diverse audience. One of Paxful’s key features is its direct peer-to-peer trading system, eliminating the need for intermediaries or cryptocurrency exchanges. By leveraging Paxful’s escrow system, users can trade securely and confidently.\n\nWhat sets Paxful apart is its commitment to identity verification, ensuring a trustworthy environment for buyers and sellers alike. With these user-centric qualities, Paxful has successfully established itself as a leading platform for hassle-free digital currency transactions, appealing to a wide range of individuals seeking a reliable and convenient trading experience. Buy Verified Paxful Account.\n\n \n\nHow paxful ensure risk-free transaction and trading?\nEngage in safe online financial activities by prioritizing verified accounts to reduce the risk of fraud. Platforms like Paxfu implement stringent identity and address verification measures to protect users from scammers and ensure credibility.\n\nWith verified accounts, users can trade with confidence, knowing they are interacting with legitimate individuals or entities. By fostering trust through verified accounts, Paxful strengthens the integrity of its ecosystem, making it a secure space for financial transactions for all users. Buy Verified Paxful Account.\n\nExperience seamless transactions by obtaining a verified Paxful account. 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Once a suitable proposal captures your interest, you can proceed to initiate a trade with the respective user, opening the doors to a seamless Bitcoin investing experience.\n\nIn conclusion, when considering the option of purchasing verified Paxful accounts, exercising caution and conducting thorough due diligence is of utmost importance. It is highly recommended to seek reputable sources and diligently research the seller’s history and reviews before making any transactions.\n\nMoreover, it is crucial to familiarize oneself with the terms and conditions outlined by Paxful regarding account verification, bearing in mind the potential consequences of violating those terms. By adhering to these guidelines, individuals can ensure a secure and reliable experience when engaging in such transactions. Buy Verified Paxful Account.\n\nContact Us / 24 Hours Reply\nTelegram:dmhelpshop\nWhatsApp: +1 (980) 277-2786\nSkype:dmhelpshop\nEmail:dmhelpshop@gmail.com\n\n " | revojop836 |
1,906,415 | Web Components vs. Vanilla JavaScript: A Niche Comparison in Frontend Technologies | In the world of frontend development, countless tools help developers create dynamic web... | 0 | 2024-06-30T08:54:00 | https://dev.to/caleb_fadare/web-components-vs-vanilla-javascript-a-niche-comparison-in-frontend-technologies-34mo | webdev, javascript, webcomponents, programming | In the world of frontend development, countless tools help developers create dynamic web applications. While ReactJS is popular—especially here at HNG—it's worth exploring other frontend technologies. Today, we'll compare Web Components and Vanilla JavaScript.
## Web Components: Building Custom Elements Natively
**Overview**
Web Components allow developers to create reusable and encapsulated custom HTML elements. These components are supported natively by modern browsers, eliminating the need for external libraries or frameworks.
**Key Features**
**Custom Elements:** Define and use custom HTML tags.
**Shadow DOM:** Encapsulate component structure and styles, preventing conflicts.
**HTML Templates:** Create reusable template elements that can be cloned and rendered as needed.
## **Advantages**
**Reusability:** Components can be used across projects and integrated with various frameworks.
**Encapsulation:** Shadow DOM ensures styles and scripts are scoped to the component.
**Standards-Based:** Supported natively by modern browsers for broad compatibility.
## **Challenges**
**Browser Support:** Older browsers may require polyfills.
**Complexity**: The API can be more complex compared to high-level frameworks.
**Tooling:** Less mature ecosystem compared to popular frameworks like React or Vue.
## Vanilla JavaScript: Mastering the Core Language
**Overview**
Vanilla JavaScript refers to using plain JavaScript without additional libraries or frameworks. It offers complete control over the browser's capabilities.
**Key Features**
**Direct DOM Manipulation:** Work directly with the DOM.
**No Dependencies:** No external libraries, reducing overhead.
**Flexibility:** Complete control over your code for optimized solutions.
**Advantages**
**Performance:** Highly efficient without framework overhead.
**Core Understanding:** Deepens knowledge of JavaScript.
**Flexibility:** Implement exactly what you need without constraints.
**Challenges**
**Complexity for Large Projects:** Managing state and updates can be challenging.
**Boilerplate Code:** More code for common tasks.
**Maintenance:** Harder to maintain consistency without framework conventions.
## ReactJS at HNG
At HNG, ReactJS is the framework of choice due to its component-based architecture, extensive ecosystem, and active community. During my time at HNG, I look forward to mastering React, building robust applications, and collaborating with fellow developers.The HNG Internship is a fantastic opportunity to grow as a developer. Learn more about the program [here](https://hng.tech/internship) and explore hiring opportunities [here](https://hng.tech/hire).
## **Conclusion**
Web Components and Vanilla JavaScript offer unique benefits. Web Components provide a standards-based approach for reusable elements, while Vanilla JavaScript offers unmatched flexibility and performance. Exploring these technologies broadens our understanding and enhances our development skills.Feel free to reach out with any questions. Happy coding! | caleb_fadare |
1,906,414 | The Ultimate Guide to Booking a Party Bus in Perth | Are you looking to take your next celebration in Perth to the next level? Look no further than a... | 0 | 2024-06-30T08:51:29 | https://dev.to/sadman_sadik_e2929557d86d/the-ultimate-guide-to-booking-a-party-bus-in-perth-63k | webdev, beginners, javascript, programming | Are you looking to take your next celebration in Perth to the next level? Look no further than a party bus! Party buses have become the ultimate way to elevate any event, whether it's a birthday bash, a hen or stag do, a corporate function, or just a fun night out with friends. In this comprehensive guide, we'll explore the world of party bus hire in Perth, from the benefits of choosing this mode of transportation to the top providers in the area and how to plan the perfect party bus experience.
## The Allure of Party Buses in Perth
Perth is a vibrant city with a thriving social scene, and party buses have become an increasingly popular way for locals and visitors alike to make the most of it. These specially-equipped vehicles offer a unique and unforgettable way to travel, transforming the journey into an integral part of the celebration.
## Convenience and Comfort
One of the primary advantages of hiring a party bus in Perth is the sheer convenience it offers. Rather than having to coordinate multiple cars, designate drivers, or worry about parking, you and your guests can simply climb aboard the bus and let the driver handle the logistics. Party buses are designed with comfort in mind, featuring plush seating, mood lighting, and often even amenities like a bar, sound system, and dance floor.
## Safety and Responsibility
Choosing a party bus also ensures a responsible and safe way to enjoy your night out. With a professional driver at the wheel, you and your guests can indulge in the festivities without the concern of drink-driving. This not only provides peace of mind but also allows everyone to fully immerse themselves in the experience.
## Unique and Memorable Experiences
Perhaps the most alluring aspect of party bus hire in Perth is the opportunity to create truly unique and memorable experiences. These vehicles transform the journey into a party in itself, with music, dancing, and a festive atmosphere that sets the tone for the entire event. Whether you're celebrating a special occasion or simply looking to have a night to remember, a party bus can make it an unforgettable experience.
## Top Party Bus Providers in Perth
When it comes to [party bus hire Perth](https://limovan.com.au/), there are several reputable providers to choose from. Here are some of the top options to consider:
**1. Perth Party Buses**
Perth Party Buses is a leading provider in the city, offering a range of modern and well-equipped party buses to cater to various group sizes and event types. Their fleet includes vehicles with features like LED lighting, surround sound systems, and fully-stocked bars.
**2. Elite Party Buses**
Elite Party Buses is known for their high-end party bus options, featuring luxurious interiors and amenities such as plasma TVs, mood lighting, and even dance poles. They pride themselves on delivering an exceptional level of service and attention to detail.
**3. Party Bus Perth**
[Party Bus Perth ](https://limovan.com.au/)is a popular choice for those seeking a more budget-friendly option without compromising on quality. Their party buses are well-maintained and equipped with essential features to ensure a great time for your group.
**4. Platinum Party Buses**
Platinum Party Buses is a premium provider that specializes in creating truly unique and customized party bus experiences. Their fleet includes a variety of themed buses, such as a disco-themed bus or a limousine-style party bus, to cater to your specific event needs.
**5. Partybus WA**
Partybus WA is a reliable and experienced party bus company that offers a range of vehicles to suit different group sizes and budgets. They are known for their exceptional customer service and attention to detail.
When selecting a party bus provider in Perth, be sure to consider factors such as the size of your group, the type of event you're planning, the amenities you'd like, and your overall budget. It's also important to read reviews, check the company's reputation, and ensure that they have the necessary licenses and insurance to operate safely.
## Planning the Perfect Party Bus Experience
Once you've chosen your party bus provider, it's time to start planning the details of your event. Here are some key considerations to keep in mind:
**Itinerary and Route Planning**
Work closely with your party bus company to plan an itinerary that fits your needs. This might include stops at various venues, such as bars, clubs, or restaurants, or a continuous loop around the city. Be sure to factor in traffic and any other logistical considerations.
**Decorations and Customization**
Many party bus providers offer the option to customize the interior of the bus with decorations, themes, or special touches to match the occasion. This can include things like balloons, streamers, or even custom lighting and music playlists.
**Catering and Refreshments**
Consider including catering or refreshments as part of your party bus experience. This could be as simple as providing snacks and non-alcoholic beverages, or you could go all out with a full bar setup and gourmet catering.
**Guest List and Headcount**
Ensure you have an accurate headcount of your guests, as this will determine the size of the party bus you'll need to accommodate everyone comfortably. Many providers have minimum and maximum capacities, so it's important to get this right.
**Timing and Scheduling**
Carefully plan the timing of your party bus experience, taking into account factors like the duration of the event, any planned stops or activities, and the availability of your guests. Be sure to communicate the schedule clearly with your party bus provider and guests.
**Safety and Responsible Enjoyment**
While the party bus experience is all about having a great time, it's crucial to prioritize safety and responsible enjoyment. Ensure that your guests are aware of any rules or guidelines, and that a designated sober individual is present to assist with monitoring the situation.
By considering these key elements, you can create a truly unforgettable party bus experience in Perth that will have your guests talking for years to come.
**Maximizing Your Party Bus Experience**
To ensure that your party bus experience in Perth is a resounding success, here are some additional tips and suggestions:
**Embrace the Atmosphere**
One of the best things about a party bus is the unique atmosphere it creates. Encourage your guests to embrace the festive vibe, dance, sing, and make the most of the journey. This will help set the tone for the entire event and create lasting memories.
**Incorporate Games and Activities**
To keep the energy high and your guests engaged, consider incorporating fun games and activities into the party bus experience. This could include music trivia, karaoke, or even party games like truth or dare.
**Document the Experience**
Don't forget to capture the memories of your party bus adventure. Encourage your guests to take photos and videos, and consider hiring a photographer or videographer to document the event professionally.
**Extend the Celebration**
If you're looking to make the most of your party bus experience, consider extending the celebration beyond the journey itself. This could involve booking a table at a nearby club or bar, or planning a post-party gathering at a private venue.
**Provide Comfort and Convenience**
Ensure that your guests are comfortable and well-cared for throughout the experience. This might include providing amenities like water, snacks, or even a change of clothes for those who plan to continue the festivities.
By embracing the unique atmosphere, incorporating engaging activities, and prioritizing the comfort and convenience of your guests, you can create a truly unforgettable party bus experience in Perth.
## Conclusion
In conclusion, a party bus in Perth is an unparalleled way to elevate any celebration, whether it's a birthday, a hen or stag do, a corporate event, or simply a night out with friends. With a wide range of reputable providers, customizable options, and the ability to create truly unique and memorable experiences, a party bus is the perfect choice for those looking to take their event to new heights.
So, what are you waiting for? Start planning your ultimate party bus experience in Perth today and get ready to embark on a journey like no other! | sadman_sadik_e2929557d86d |
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New Transitions and Effects: A plethora of new transitions and visual effects have been added, allowing for more dynamic and engaging videos.
Customizable Keyboard Shortcuts: Users can now set their own keyboard shortcuts, speeding up the editing process and making the software more personalized.
**Improved Audio Features**
Audio quality is just as important as video quality, and Camtasia 2023.1.1 recognizes this. The latest version includes advanced audio editing features such as noise removal, audio leveling, and improved audio synchronization. These tools ensure that your audio is crisp and clear, enhancing the overall quality of your videos.
##Collaboration and Sharing Enhancements
For teams working on video projects, Camtasia 2023.1.1 offers new collaboration features. Projects can now be shared more easily between team members, and the software includes new annotation tools for feedback and comments. Additionally, exporting options have been expanded to support more formats and resolutions, ensuring compatibility with a wider range of platforms.
##Getting Started with Camtasia Studio 2023.1.1
**Installation and Setup**
Getting started with Camtasia Studio 2023.1.1 is straightforward. After purchasing the software, download the installer from the TechSmith website and follow the on-screen instructions. The installation process is quick, and once complete, you can launch the software and begin your video creation journey.
## Recording Your Screen
Launch Camtasia: Open the software and click on the “Record” button.
Select Recording Area: Choose whether to record the full screen or a specific region.
Adjust Settings: Configure the audio and camera settings to suit your needs.
Start Recording: Click the “Start Recording” button and perform the actions you want to capture.
Stop Recording: Once done, hit the “Stop” button, and the recording will be automatically imported into the Camtasia editor.
##Editing Your Videos
Import Media: Add any additional media files you need, such as images, audio clips, or other video files.
Arrange Clips on the Timeline: Drag and drop your media onto the timeline, arranging them in the desired order.
Add Effects and Transitions: Enhance your video with the new transitions and effects available in Camtasia 2023.1.1.
Edit Audio: Use the audio tools to ensure your sound is clear and well-balanced.
Preview and Fine-Tune: Continuously preview your video as you make adjustments to ensure everything is perfect.
##Exporting and Sharing
Choose Export Settings: Click on the “Export” button and select your desired format and resolution.
Configure Advanced Options: For more control, tweak the advanced export settings.
Export Video: Once everything is set, hit the “Export” button and wait for Camtasia to process your video.
Share: Share your video directly to platforms like YouTube, Vimeo, or your own website.
##Tips and Tricks for Maximizing Productivity
**Utilize Keyboard Shortcuts**
Customizable keyboard shortcuts in Camtasia 2023.1.1 can save you a lot of time. Spend some time setting up shortcuts for your most-used functions, and you’ll notice a significant boost in your editing speed.
**Take Advantage of Templates**
Camtasia comes with several pre-made templates that can help streamline your workflow. These templates can be customized to fit your specific needs and can be a great starting point for your projects.
**Leverage the Power of Annotations**
Annotations are a powerful tool in Camtasia. Use them to highlight important information, guide viewers, or add a personal touch to your videos. The latest version includes new annotation styles, giving you even more creative options.
**Regularly Save Your Work**
Video editing can be a resource-intensive process, and it’s not uncommon for software to crash occasionally. To avoid losing your progress, make sure to save your work regularly. Camtasia 2023.1.1 includes an auto-save feature, but it’s always good practice to manually save frequently as well.
##Troubleshooting Common Issues
**Performance Issues**
If you encounter performance issues while using Camtasia 2023.1.1, there are several steps you can take:
Close Unnecessary Programs: Ensure that other resource-intensive programs are closed while you’re working in Camtasia.
Update Drivers: Make sure your graphics and audio drivers are up to date.
Lower Preview Quality: Reducing the preview quality can improve performance without affecting the final output quality.
**Audio Sync Problems**
If you notice that your audio is out of sync with your video, try the following solutions:
Adjust Audio Settings: In the audio settings, you can manually sync the audio with the video.
Use Markers: Place markers at key points to ensure audio and video alignment.
Re-record: In some cases, re-recording the audio might be the easiest solution.
**Export Errors**
Exporting errors can be frustrating, but they are often solvable:
Check Disk Space: Ensure you have enough free disk space for the export.
Update Software: Make sure you’re using the latest version of Camtasia, as updates often fix bugs and improve performance.
Simplify Project: Try simplifying your project by removing unnecessary elements or splitting it into smaller parts.
##Conclusion
Camtasia Studio 2023.1.1 is a powerful, user-friendly tool that offers a wide range of features for creating professional-quality videos. Whether you’re a seasoned video editor or just getting started, this software provides the tools and flexibility you need to produce stunning content. By taking advantage of its new features and following the tips outlined in this guide, you can maximize your productivity and create videos that captivate and engage your audience.
With its enhanced screen recording capabilities, advanced editing tools, and improved audio features, Camtasia Studio 2023.1.1 stands out as a top choice for video creators. Embrace the power of Camtasia and take your video editing skills to the next level.
| mrwood | |
1,906,407 | [DAY 66-68] I built a drum set app using React | Hi everyone! Welcome back to another blog where I document the things I learned in web development. I... | 27,380 | 2024-06-30T08:40:55 | https://dev.to/thomascansino/day-66-68-i-built-a-drum-set-app-using-react-4i19 | buildinpublic, react, webdev, javascript | Hi everyone! Welcome back to another blog where I document the things I learned in web development. I do this because it helps retain the information and concepts as it is some sort of an active recall.
On days 66-68, after completing the first 2 projects in the front end course (the random quote machine and the markdown previewer), I successfully deployed the random quote machine and markdown previewer apps to github pages.
After that, I moved on to the 3rd project which is a drum machine.
What I did first is to write the HTML of the app by making div containers for the drum pad buttons, power toggle, display, and volume slider.
Each drum pad button having its own container, I also added the respective audio clips to be played for each button. After that, I made a function to handle presses and also event listeners to handle keydowns so that when I click a drum pad or press the key associated with it, the audio clip will play.
For the power toggle button, I looked up a tutorial on how to make a simple night-mode toggle button using input and label elements and implemented it into my app. I coded all functions in my program so that when the power toggle is set to FALSE, the whole app will not work.
For the display container, it pretty much displays the current audio being played as text.
Lastly, for the volume slider, I used an input element with a type attribute of range. I made a function so that whenever the slider is moved up or down, the volume will change correspondingly. I also slightly adjusted its design to match the color palette of the app.
Anyways, the link for the apps are:
Random Quote Machine: https://thomascansino.github.io/P41-Random-Quote-Machine/
Markdown Previewer: https://thomascansino.github.io/P42-Markdown-Previewer/
Drum Machine: https://thomascansino.github.io/P43-Drum-Machine/
That’s all for now, more updates in my next blog! See you there!
| thomascansino |
1,906,042 | Use AWS Serverless to sell items in Habitica | I use Habitica daily. It is a very strong motivator to keep me on track with my daily tasks. However,... | 0 | 2024-06-30T08:38:00 | https://pabis.eu/blog/2024-06-30-Habitica-Item-Seller-Lambda-SAM.html | lambda, aws, habitica | I use Habitica daily. It is a very strong motivator to keep me on track with my daily tasks. However, I already collected all the free pets and mounts and so I don't need most of the items I collect. Selling them is a pain as you have to sell one item with each click. But Habitica has a [remarkable API](https://habitica.com/apidoc/). I decided to automate this process with AWS Lambda and EventBridge scheduled events.
The completed project can be found here:
https://github.com/ppabis/habitica-item-seller/tree/v1
Getting API key
---------------
Obviously you need a Habitica account. Once you are there (on a desktop browser), go to Settings -> [Site Data](https://habitica.com/user/settings/siteData). You will see API section where you can download the token. But be careful as the only way to reset the token is to send email to Habitica support. Also save your user ID.
Storing token in AWS Secrets Manager
------------------------------------
Secrets Manager is a great place to store such a token. Alternatively you can use SSM Parameter Store with `SecretString` to keep costs low. In a new directory for our project we will create `template.yaml`. This will be our AWS SAM template. Normally SAM doesn't have a resource for Secrets Manager. However, it is just a CloudFormation file with extras so we can use all CloudFormation compatible resources.
The user ID and API key will be provided as secret parameters (NoEcho). You will need to specify them every time you use `sam deploy --guided`.
```yaml
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: A function that sells Habitica items periodically leaving only a subset of those
Parameters:
HabiticaApiKey:
Type: String
Description: The API key for the Habitica account
NoEcho: true
HabiticaUserId:
Type: String
Description: The user ID for the Habitica account
NoEcho: true
Resources:
HabiticaSecret:
Type: AWS::SecretsManager::Secret
Properties:
Description: Secret for the Habitica API key and user ID
SecretString: !Sub '{"${HabiticaUserId}": "${HabiticaApiKey}"}'
```
Authenticating with Habitica
----------------------------
So using the provided values we can authenticate with Habitica API by providing them as headers. We will define our functions with Python. I created the file below in a new directory under `sell_items/auth.py`. The first function is used to retrieve the user and key from Secrets Manager by specified ARN in the environment variables. If this is not specified, it tries resolving the secret and user directly from the environment variables (this can be used for testing locally).
The secret is defined in Secrets Manager as a JSON object where the key is the user ID and the value is the API token. `get_secret` function will return the first key-value pair as a tuple. The `x-client` header is based on user ID as per Habitica requirements when creating a third-party integration - see [this wiki page](https://habitica.fandom.com/wiki/Guidance_for_Comrades#X-Client_Header).
```python
import os, json
from boto3 import client
def get_secret(habitica):
"""
Retrieves the secret from AWS Secrets Manager.
"""
secrets = client("secretsmanager")
secret = secrets.get_secret_value(SecretId=habitica)
secret = json.loads(secret['SecretString'])
return list(secret.items())[0]
def get_headers() -> dict:
"""
Produces a list of headers that are required for Habitica API requests.
"""
# By default try to load environment variables.
HABITICA_USER=os.getenv('HABITICA_USER')
HABITICA_KEY=os.getenv('HABITICA_KEY')
# But if there's HABITICA_SECRET set, use Secrets Manager.
HABITICA_SECRET=os.getenv('HABITICA_SECRET')
if HABITICA_SECRET:
print('Using Secrets Manager.')
HABITICA_USER, HABITICA_KEY = get_secret(HABITICA_SECRET)
HABITICA_CLIENT=f"{HABITICA_USER}-itemseller10"
print(f"Client {HABITICA_CLIENT}")
return {
"x-api-user": HABITICA_USER,
"x-api-key": HABITICA_KEY,
"x-client": HABITICA_CLIENT
}
```
Retrieving data from the Habitica API
-------------------------------------
In order to test the authentication, we can write a function that will get the inventory that we will later use in the application. This function will just retrieve all hatching potions, eggs and food from inventory along with gold. In case the authentication fails, we will throw an exception.
```python
import requests
HABITICA_URL="https://habitica.com/api/v3"
def get_inventory(headers: dict) -> tuple[dict, float]:
"""
Gets user inventory in the form of eggs, potions, food and stats (gold).
Returns a tuple of (items: dict, gold: float).
"""
url = f"{HABITICA_URL}/user?userFields=stats,items.eggs,items.hatchingPotions,items.food"
response = requests.get(url, headers=headers)
code = response.status_code
if code == 200:
items = response.json()['data']['items']
gold = response.json()['data']['stats']['gp']
return items, gold
raise Exception(response.json()['message'])
```
Next in a new file file `main.py` let us glue the two function together and print out the result. Set the values for `HABITICA_SECRET` and `HABITICA_USER` as environment variables.
```python
from auth import get_headers
from actions import get_inventory
if __name__ == "__main__":
headers = get_headers()
items, gold = get_inventory(headers)
print(f"Items: {items}")
print(f"Gold: {gold}")
```
To run it safely without exposing your API token too much, use the following bash commands. It will ask you for the token without any prompt and won't echo.
```bash
$ read -s HABITICA_USER
$ read -s HABITICA_KEY
$ export HABITICA_USER HABITICA_KEY
$ python3 main.py
Client 12345678-8b3d-48af-aabb-ccddee445566-itemseller10
Gold: 22670.394004083322
Items: {'eggs': {'BearCub': 100, 'TigerCub': 100, 'PandaCub': 100, 'Fox': 100,...
```
Another important thing in Habitica is that some of the items are not obtainable randomly but are very valuable, purchased with gems. These items we want to protect from our script. I created a function that will filter items to leave only the most common ones. It is a simple Python array operation that you can [find here](https://github.com/ppabis/habitica-item-seller/blob/main/sell_items/filters.py).
Integrate the function in your `get_inventory` function.
```python
from filters import filter_items
# ...
if code == 200:
items = response.json()['data']['items']
gold = response.json()['data']['stats']['gp']
return filter_items(items), gold
# ...
```
Functions for selling an item
-----------------------------
Now we can write a function that will sell an item. This will be similarly just a REST call to Habitica. Compared to the UI available on the web or mobile, this function allows us to set the amount of items to sell.
```python
def sell_item(headers: dict, item_type: str, item_key: str, count: int):
"""
Sells a specific item with the given count.
1:1 mapping of Habitica API documentation.
"""
url = f"{HABITICA_URL}/user/sell/{item_type}/{item_key}?amount={count}"
response = requests.post(url, headers=headers)
code = response.status_code
if code == 200:
return response.json()
raise Exception(response.json()['message'])
```
Find the most common item in your inventory and sell one of it for testing. Add the sell routine to the `main` section. This function will return a lot of data about the player including inventory after sale and current gold amount.
```python
from auth import get_headers
from actions import get_inventory, sell_item
if __name__ == "__main__":
headers = get_headers()
items, gold = get_inventory(headers)
print(f"Gold: {gold:.2f}\nItems: {items}")
sale = sell_item(headers, 'eggs', 'TigerCub', 1)
new_gold = sale['data']['stats']['gp']
print(f"Gold after sale: {new_gold:.2f}")
```
Run the script again and see how much money you have after a sale.
```bash
$ python3 main.py
Client 12345678-8b3d-48af-aabb-ccddee445566-itemseller10
Gold: 22824.60
Items: {'eggs': {'BearCub': 101, 'TigerCub': 99, 'PandaCub': 100, ...
Gold after sale: 22827.60
```
Iterating through the items
----------------------------
Now, we can iterate through all the items and sell them. However, we have a lot of item types and we don't want to hit Habitica's API rate threshold, which is very low. In order to avoid this, we will sell only items from one category in one run of the function. The category will be passed to Lambda in the event. The new function will take `event` as an argument.
Next thing is that we don't want to sell all the items. This fact can help us improve the function even more by filtering out items that don't need to be sold as we have less of them then the value of items to keep. The function will return how much gold we made for this function invocation.
```python
def sell_items(headers: dict, items_to_leave: int, event) -> float:
"""
Sells items of a specific category in `event['sell_category']`.
"""
if not is_event_valid(event):
print("No sell_category specified!")
raise ValueError("Missing 'sell_category' key in event. And such, ignoring this event.")
category = event['sell_category']
items, gold = get_inventory(headers)
new_gold = gold # To define it in case we don't sell anything.
print(f"Starting with gold [{category}] {gold:.2f}.")
items_to_sell = items[category]
# Filter items that we have more than threshold.
items_to_sell = {k: v for k, v in items_to_sell.items() if v > items_to_leave}
# Print history of what is being done.
string_items = ", ".join([f"{k} ({v})" for k, v in items_to_sell.items()])
print(f"Items to sell [{category}]: {string_items}")
last_sale = None
# Sell items and store the last sale for gold calculation.
for item, amount in items_to_sell.items():
count = amount - items_to_leave
print(f"Selling {count} of {item}.")
try:
_sold = sell_item(headers, event['sell_category'], item, count)
except Exception as e:
print(f"Failed to sell {item}: {e}.")
continue
last_sale = _sold
print(f"Sold {count} of {item}.")
if last_sale is not None:
new_gold = last_sale['data']['stats']['gp']
print(f"Gold after sale [{category}]: {new_gold:.2f}. Made {new_gold - gold:.2f} gold.")
else:
print(f"Didn't sell anything for {category}.")
return new_gold - gold
```
Main function for Lambda
------------------------
Now we need to glue together all the parts. In `main.py` we can import required functions that we created. We will also initialize all the constants such as API key, user ID, environment configuration. Remember to remove everything under `if __name__ == "__main__":` as it is not needed in Lambda and can be called accidentally.
```python
from actions import sell_items
from auth import get_headers
import os, json
HEADERS = get_headers()
# This is the amount of each item that will be left and not sold.
ITEMS_TO_LEAVE = int(os.getenv('ITEMS_TO_LEAVE', "150"))
def lambda_handler(event, context):
if event is str:
event: dict = json.loads(event)
try:
gp = sell_items(HEADERS, ITEMS_TO_LEAVE, event)
except Exception as e:
return {
"statusCode": 400,
"body": str(e)
}
return {
"statusCode": 200,
"body": "Earned {gp:.2f} gold."
}
```
Adding function to SAM template
-------------------------------
SAM is perfect for handling Lambda functions. It can install `requirements.txt` for us, zip everything and deploy. In the scripts I wrote above, only `requests` is needed as an extra package. If you prefer to keep your function slim, you can use `urllib3` alternatively. Otherwise, create `requirements.txt` in your code directory (my is `sell_items`) with just one line: `requests`.
We will also specify Lambda memory and execution timeout. Add lines below to your `template.yaml` under the description.
```yaml
# ...
Globals:
Function:
Timeout: 15
MemorySize: 128
```
In `Resources` section we will add the Lambda. It will reference the `Secret` so it's worth putting it below the `HabiticaSecret` block. In `HABITICA_SECRET` environment variable we will have ARN of the secret that will be picked up by our function. In `Policies` we will also specify IAM permissions for Lambda's execution role so that it can read the secret. `AWSSecretsManagerGetSecretValuePolicy` is a managed policy that will put all the necessary permissions, without us needing to refer the documentation 😁. I recommend keeping architecture as `arm64` as it is more cost efficient. `CodeUri` refers to the directory where you keep all your Python files.
```yaml
Resources:
# ...
HabiticaSellItems:
Type: AWS::Serverless::Function
Properties:
CodeUri: sell_items/
Handler: main.lambda_handler
Runtime: python3.12
Architectures:
- arm64
Policies:
- AWSSecretsManagerGetSecretValuePolicy:
SecretArn: !Ref HabiticaSecret
Environment:
Variables:
HABITICA_SECRET: !Ref HabiticaSecret
ITEMS_TO_LEAVE: "100"
```
Scheduling the function
-----------------------
As you remember from previous sections, Habitica's API has a strict rate limit. To mitigate this, we split the selling routines into categories. For each category we will define a separate EventBridge schedule that will fire at a different time. Append `Events` section to you `Function` resource. For each event definition we will specify a different input to be feed to the function.
```yaml
HabiticaSellItems:
Type: AWS::Serverless::Function
Properties:
CodeUri: sell_items/
#...
Events:
FoodSchedule:
Type: Schedule
Properties:
Schedule: cron(10 1 * * ? *)
Input: '{"sell_category": "food"}'
Enabled: true
EggsSchedule:
Type: Schedule
Properties:
Schedule: cron(15 1 * * ? *)
Input: '{"sell_category": "eggs"}'
Enabled: true
HatchingPotionsSchedule:
Type: Schedule
Properties:
Schedule: cron(20 1 * * ? *)
Input: '{"sell_category": "hatchingPotions"}'
Enabled: true
```
The above configuration will run the tasks at 1:10AM UTC, 1:15 and 1:20. Next we will build the configuration using SAM and deploy it as well. You will need your AWS access keys and [SAM installed](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/install-sam-cli.html#install-sam-cli-instructions). For the first run use `sam deploy --guided` to give Habitica API key and user. If you don't change the user or API key, just use `sam deploy` and it will skip asking you for parameters of the secret.
```bash
$ sam build
$ sam deploy --guided
```
Watching the results
--------------------
So I didn't specify `ITEMS_TO_LEAVE` at the beginning so it defaulted to 150. It successfully ran at night and sold all the items I had more than 150 of. For the next night I lowered the threshold to 100 and again it worked perfectly.
I also checked CloudWatch to see the logs of the function and the whole process. Here everything seemed stable and behaved as expected. First selling down to 150 things in the inventory and the next day to 100.
 | ppabis |
1,906,406 | Understanding Declarative Programming in React | React is a popular JavaScript library used for building user interfaces, and one of its core... | 27,828 | 2024-06-30T08:37:26 | https://imabhinav.dev/blog/understanding-declarative-programming-in-react-8-36-51 | webdev, javascript, react, beginners | React is a popular JavaScript library used for building user interfaces, and one of its core principles is **declarative programming**. To understand why React is declarative, we first need to grasp what declarative programming is and how it contrasts with **imperative programming**.
### Declarative vs. Imperative Programming
#### Imperative Programming
Imperative programming is a programming paradigm where you explicitly describe the steps your program must take to achieve a desired state. In other words, you tell the computer *how* to do something.
**Example of Imperative Programming:**
Let's say we want to create a list of numbers from 1 to 5 and print them.
```js
const numbers = [1, 2, 3, 4, 5];
for (let i = 0; i < numbers.length; i++) {
console.log(numbers[i]);
}
```
In this example, you:
1. Create an array of numbers.
2. Use a loop to iterate through each number.
3. Print each number.
You specify *how* the task should be done step by step.
#### Declarative Programming
Declarative programming, on the other hand, is a paradigm where you describe *what* you want to achieve without explicitly outlining the steps to get there. You focus on the end result rather than the process.
**Example of Declarative Programming:**
Using the same task of printing numbers from 1 to 5, the declarative approach might look like this:
```js
const numbers = [1, 2, 3, 4, 5];
numbers.forEach(number => console.log(number));
```
In this example, you:
1. Create an array of numbers.
2. Use the `forEach` method to print each number.
You describe *what* you want to do (print each number) without specifying the underlying steps (the iteration process).
### React and Declarative Programming
React embraces declarative programming, especially in how we describe the UI. Instead of detailing how the UI should change, we describe what the UI should look like in a given state.
#### Example: Creating a Button in React
**Imperative Approach:**
Without React, you might use vanilla JavaScript to create a button and attach an event listener:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Imperative Example</title>
</head>
<body>
<div id="app"></div>
<script>
const appDiv = document.getElementById('app');
const button = document.createElement('button');
button.innerText = 'Click Me';
button.addEventListener('click', () => {
alert('Button Clicked');
});
appDiv.appendChild(button);
</script>
</body>
</html>
```
Here, you:
1. Select a div element to hold the button.
2. Create a button element.
3. Set the button's text.
4. Attach an event listener to the button.
5. Append the button to the div.
**Declarative Approach with React:**
With React, you declare what the UI should look like using JSX:
```jsx
import React from 'react';
import ReactDOM from 'react-dom';
function App() {
return (
<button onClick={() => alert('Button Clicked')}>
Click Me
</button>
);
}
ReactDOM.render(<App />, document.getElementById('app'));
```
In this example, you:
1. Define a component (`App`) that returns the button element.
2. Use JSX to describe the button and its event handler.
3. Render the `App` component into the `app` div.
React takes care of the underlying DOM manipulation. You focus on describing what the UI should look like based on the application's state.
### Benefits of Declarative Programming in React
1. **Simpler Code**: Declarative code is often easier to read and understand because it focuses on the "what" rather than the "how."
2. **Maintainability**: Changes are easier to manage and reason about since you modify descriptions of UI states rather than procedural steps.
3. **Reusability**: Components can be reused across different parts of the application, promoting code reuse and consistency.
### Conclusion
React's declarative nature allows developers to write more intuitive and manageable code by describing what the UI should look like in different states. By understanding the differences between declarative and imperative programming, you can appreciate why React's approach leads to cleaner and more efficient code. | imabhinavdev |
1,902,778 | 40 Days Of Kubernetes (7/40) | Day 7/40 Pod In Kubernetes Explained | Imperative VS Declarative Way | YAML... | 0 | 2024-06-29T20:13:24 | https://dev.to/sina14/40-days-of-kubernetes-740-4hg9 | kubernetes, 40daysofkubernetes | ## Day 7/40
# Pod In Kubernetes Explained | Imperative VS Declarative Way | YAML Tutorial
[Video Link](https://www.youtube.com/watch?v=_f9ql2Y5Xcc)
@piyushsachdeva
[Git Repository](https://github.com/piyushsachdeva/CKA-2024/)
[My Git Repo](https://github.com/sina14/40daysofkubernetes)
There are 2 ways of configuration and deploying a workload such as `pod` in `Kubernetes`:
1. Imperative
2. Declarative
#### Imperative configuration
Which means that to describe the configuration of the resource, you execute a command from a terminal’s command prompt. (using `kubectl` for instance)
#### Declarative configuration
Which means that you create a file that describes the configuration for the particular resource and then apply the content of the file to the `Kubernetes` cluster. (using `yaml` file and `json` format)
---
**Note**
If you need a playground you can [Play with `Kubernetes`](https://labs.play-with-k8s.com/)
At first you have to create your environment with the instruction as they mention:
```
This is a sandbox environment. Using personal credentials
is HIGHLY! discouraged. Any consequences of doing so, are
completely the user's responsibilites.
You can bootstrap a cluster as follows:
1. Initializes cluster master node:
kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16
2. Initialize cluster networking:
kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml
3. (Optional) Create an nginx deployment:
kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx-app.yaml
The PWK team.
```
```console
[node1 ~]$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
node1 Ready control-plane 32s v1.27.2
[node1 ~]$ kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* kubernetes-admin@kubernetes kubernetes kubernetes-admin
```
---
### 1. Create `pod` with imperative way
```console
root@localhost:~# kubectl get nodes
NAME STATUS ROLES AGE VERSION
lucky-luke-control-plane Ready control-plane 89m v1.30.0
lucky-luke-worker Ready <none> 88m v1.30.0
lucky-luke-worker2 Ready <none> 88m v1.30.0
root@localhost:~# kubectl run nginx-pod --image=nginx:latest
pod/nginx-pod created
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 0/1 ContainerCreating 0 8s
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 0 21s
root@localhost:~# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-pod 1/1 Running 0 43s 10.244.2.2 lucky-luke-worker2 <none> <none>
```
As you can see, our nginx-pod is running on worker2 `node` of our `cluster`, and it's containing one `container` running out of one.
### 2. Create `pod` with declarative way
Firstly, we need to create a `yaml` file with our desired options.
Read more about [`yaml`](https://spacelift.io/blog/yaml)
```console
root@localhost:~# touch day07-yaml.yaml
```
The starting content:
```yaml
# this is a sample file
#
apiVersion:
kind:
metadata:
spec:
```
for more information about it you can run the below command:
```console
root@localhost:~# kubectl explain pod
KIND: Pod
VERSION: v1
DESCRIPTION:
Pod is a collection of containers that can run on a host. This resource is
created by clients and scheduled onto hosts.
FIELDS:
apiVersion <string>
APIVersion defines the versioned schema of this representation of an object.
Servers should convert recognized schemas to the latest internal value, and
may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind <string>
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata <ObjectMeta>
Standard object's metadata. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec <PodSpec>
Specification of the desired behavior of the pod. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
status <PodStatus>
Most recently observed status of the pod. This data may not be up to date.
Populated by the system. Read-only. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
```
final version of our `yaml` file:
```yaml
# this is a sample file
#
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod-2
labels:
env: demo
type: frontend
spec:
containers:
- name: nginx-container
image: nginx
ports:
- containerPort: 80
```
Create with `kubectl`
```console
root@localhost:~# kubectl create -f day07-yaml.yaml
pod/nginx-pod-2 created
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 0 28m
nginx-pod-2 0/1 ContainerCreating 0 8s
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 0 28m
nginx-pod-2 1/1 Running 0 16s
root@localhost:~# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-pod 1/1 Running 0 28m 10.244.2.2 lucky-luke-worker2 <none> <none>
nginx-pod-2 1/1 Running 0 32s 10.244.1.2 lucky-luke-worker <none> <none>
```
As you can see the second `pod` is running on worker1 `node`. Also instead of using *create* with `kubectl`, we can use *apply* with `kubectl`.
### 3. Update and edit directly an object on the cluster
For instance we need to change the version of `nginx` which is running with the latest version to 1.18. We run the command and change the version in front of `image` key and then save it.
```yaml
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: "2024-06-27T16:48:31Z"
labels:
run: nginx-pod
name: nginx-pod
namespace: default
resourceVersion: "9983"
uid: 6d0bd9ee-9f92-45b4-9416-87e02568a435
spec:
containers:
- image: nginx:1.18
imagePullPolicy: Always
...
```
```console
root@localhost:~# kubectl edit pod nginx-pod
pod/nginx-pod edited
```
for confirmation and see what happened, you can run the below command and see the logs and container version that is already is running.
```console
root@localhost:~# kubectl describe pod nginx-pod
Name: nginx-pod
Namespace: default
Priority: 0
Service Account: default
Node: lucky-luke-worker2/172.19.0.2
Start Time: Thu, 27 Jun 2024 16:48:31 +0000
Labels: run=nginx-pod
Annotations: <none>
Status: Running
IP: 10.244.2.2
IPs:
IP: 10.244.2.2
Containers:
nginx-pod:
Container ID: containerd://b9ff29ff39e7446d9ad8ab9a60fe8f29d8c4ed4ceb35c9628bc692d228bd096c
Image: nginx:1.18
Image ID: docker.io/library/nginx@sha256:e90ac5331fe095cea01b121a3627174b2e33e06e83720e9a934c7b8ccc9c55a0
Port: <none>
Host Port: <none>
State: Running
Started: Thu, 27 Jun 2024 17:40:58 +0000
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Thu, 27 Jun 2024 16:48:41 +0000
Finished: Thu, 27 Jun 2024 17:40:51 +0000
Ready: True
Restart Count: 1
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-j4sf7 (ro)
Conditions:
Type Status
PodReadyToStartContainers True
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-j4sf7:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 52m default-scheduler Successfully assigned default/nginx-pod to lucky-luke-worker2
Normal Pulling 52m kubelet Pulling image "nginx:latest"
Normal Pulled 52m kubelet Successfully pulled image "nginx:latest" in 8.319s (8.319s including waiting). Image size: 71010466 bytes.
Normal Killing 17s kubelet Container nginx-pod definition changed, will be restarted
Normal Pulling 17s kubelet Pulling image "nginx:1.18"
Normal Created 10s (x2 over 52m) kubelet Created container nginx-pod
Normal Started 10s (x2 over 52m) kubelet Started container nginx-pod
Normal Pulled 10s kubelet Successfully pulled image "nginx:1.18" in 6.882s (6.882s including waiting). Image size: 53630764 bytes.
```
### 4. Interaction with the container
```console
root@localhost:~# kubectl exec -it nginx-pod -- sh
# pwd
/
command terminated with exit code 127
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 1 (8m19s ago) 60m
nginx-pod-2 1/1 Running 0
```
Terminating with `Ctrl`+`D`
### 5. Create `yaml` file of a `pod` in `dry-run` mode
```console
root@localhost:~# kubectl run nginx-pod-3 --image=nginx:latest --dry-run=client -o yaml
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: nginx-pod3
name: nginx-pod3
spec:
containers:
- image: nginx:latest
name: nginx-pod3
resources: {}
dnsPolicy: ClusterFirst
restartPolicy: Always
status: {}
```
You can direct the result into a new `yaml` file and make your own change.
```console
root@localhost:~# kubectl run nginx-pod-3 --image=nginx:latest --dry-run=client -o yaml > nginx-pod-3.yaml
```
**Note** in `dry-run` step nothing is creates and you can use the `dry-run` step to check your manifests before deployment.
### 6. Get more details of running pods
```console
root@localhost:~# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-pod 1/1 Running 1 (19m ago) 71m 10.244.2.2 lucky-luke-worker2 <none> <none>
nginx-pod-2 1/1 Running 0 43m 10.244.1.2 lucky-luke-worker <none> <none>
root@localhost:~# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-pod 1/1 Running 1 (21m ago) 73m run=nginx-pod
nginx-pod-2 1/1 Running 0 44m env=demo,type=frontend
```
Labels are good for grouping our pods.
---
### Task 3
```yaml
apiVersion: v1
kind: Pod
metadata:
labels:
app: test
name: redis
spec:
containers:
- image: rediss
name: redis
```
```console
root@localhost:~# kubectl apply -f task3.yaml
pod/redis created
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 1 (36m ago) 89m
nginx-pod-2 1/1 Running 0 60m
redis 0/1 ErrImagePull 0 12s
root@localhost:~# kubectl describe pod redis
Name: redis
Namespace: default
Priority: 0
Service Account: default
Node: lucky-luke-worker2/172.19.0.2
Start Time: Thu, 27 Jun 2024 18:17:24 +0000
Labels: app=test
Annotations: <none>
Status: Pending
IP: 10.244.2.3
IPs:
IP: 10.244.2.3
Containers:
redis:
Container ID:
Image: rediss
Image ID:
Port: <none>
Host Port: <none>
State: Waiting
Reason: ImagePullBackOff
Ready: False
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-qks6m (ro)
Conditions:
Type Status
PodReadyToStartContainers True
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
kube-api-access-qks6m:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 94s default-scheduler Successfully assigned default/redis to lucky-luke-worker2
Normal BackOff 17s (x5 over 92s) kubelet Back-off pulling image "rediss"
Warning Failed 17s (x5 over 92s) kubelet Error: ImagePullBackOff
Normal Pulling 3s (x4 over 93s) kubelet Pulling image "rediss"
Warning Failed 2s (x4 over 92s) kubelet Failed to pull image "rediss": failed to pull and unpack image "docker.io/library/rediss:latest": failed to resolve reference "docker.io/library/rediss:latest": pull access denied, repository does not exist or may require authorization: server message: insufficient_scope: authorization failed
Warning Failed 2s (x4 over 92s) kubelet Error: ErrImagePull
root@localhost:~# kubectl edit pod redis
pod/redis edited
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 1 (38m ago) 90m
nginx-pod-2 1/1 Running 0 62m
redis 0/1 ImagePullBackOff 0 2m5s
root@localhost:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-pod 1/1 Running 1 (38m ago) 91m
nginx-pod-2 1/1 Running 0 62m
redis 1/1 Running 0 2m10s
```
As we see the image is not valid and we edit to correct image name and the problem solved!
| sina14 |
1,906,404 | Top Cloud Providers in 2024 | As we move further into the digital age, cloud computing continues to be a cornerstone of... | 0 | 2024-06-30T08:25:48 | https://dev.to/devops_den/top-cloud-providers-in-2024-fne | devops, beginners, aws, azure | As we move further into the digital age, cloud computing continues to be a cornerstone of technological advancement. The landscape of cloud service providers is evolving rapidly, with new players entering the market and established giants continuously innovating. Here’s a look at the top cloud providers in 2024 and what sets them apart.
## 1. Amazon Web Services (AWS)
### Overview
AWS remains a dominant force in the cloud computing arena. Known for its extensive range of services, AWS provides solutions for everything from compute power and storage to machine learning and artificial intelligence.
### Key Features
- Comprehensive Service Portfolio: AWS offers over 200 fully featured services.
- Global Reach: AWS has the most extensive global infrastructure, with data centers in multiple regions across the world.
- Innovative Technologies: Leading in AI/ML with services like SageMaker, and strong in IoT and serverless computing.
### Popular Services
1. EC2 (Elastic Compute Cloud)
2. S3 (Simple Storage Service)
3. Lambda (Serverless Computing)
4. RDS (Relational Database Service)
## 2. Microsoft Azure
### Overview
Microsoft Azure is a close competitor to AWS, known for its strong integration with Microsoft products and services. It is a favorite among enterprises that rely on Microsoft software.
### Key Features
- Hybrid Cloud Capabilities: Azure’s hybrid cloud approach allows seamless integration with on-premises solutions.
- Enterprise Focus: Strong enterprise solutions with integrations for Office 365, Dynamics 365, and Active Directory.
- AI and Analytics: Robust AI and machine learning offerings with Azure Machine Learning.
### Popular Services
1. Azure Virtual Machines
2. Azure Blob Storage
3. Azure SQL Database
4. Azure Kubernetes Service (AKS)
## 3. Google Cloud Platform (GCP)
### Overview
Google Cloud Platform stands out with its strengths in data analytics, machine learning, and open-source technologies. GCP is increasingly popular among startups and developers.
### Key Features
- Data and Analytics: Best-in-class data analytics tools with BigQuery and strong support for AI/ML.
- Open Source Leadership: Contributions to Kubernetes, TensorFlow, and other open-source projects.
- Performance and Security: High-performance computing capabilities and robust security features.
### Popular Services
1. Google Compute Engine
2. Google Cloud Storage
3. BigQuery
4. Google Kubernetes Engine (GKE)
https://dev.to/devops_den/create-an-aws-s3-bucket-using-terraform-49f9
Explore More About [Cloud Providers
](https://devopsden.io/article/top-cloud-providers-in-2024)
Thank You
| devops_den |
1,906,403 | Ummy Video Downloader 1.15.0.0 Crack Latest [2023 Download] | Introduction to Ummy Video Downloader In the digital age, video content has become a... | 0 | 2024-06-30T08:25:36 | https://dev.to/mrwood/ummy-video-downloader-11500-crack-latest-2023-download-2ag1 | ##Introduction to Ummy Video Downloader
In the digital age, video content has become a significant part of our daily consumption, be it for entertainment, education, or information. With the increasing demand for offline access to videos, various tools and software have been developed to facilitate video downloading. Among these, [Ummy Video Downloader crack](https://owncracks.com/ummy-video-downloader-1-15-0-0-crack-latest-2024/) has emerged as a popular choice for users who want to download videos from platforms like YouTube. This article delves into the functionalities, benefits, and considerations of using
[Free download link](https://owncracks.com/ummy-video-downloader-1-15-0-0-crack-latest-2024/)
Ummy Video Downloader.
##Key Features of Ummy Video Downloader
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Tips and Tricks for Optimal Use
To make the most out of Ummy Video Downloader, consider the following
## tips and tricks:
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Batch Downloads: Use the batch download feature to save time when downloading multiple videos.
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##
| mrwood | |
1,906,398 | Understanding JavaScript Closures: A Comprehensive Guide | Introduction Consider a situation where you require a function that retains its state... | 0 | 2024-06-30T08:25:00 | https://dev.to/mukeshb/understanding-javascript-closures-a-comprehensive-guide-306p | javascript, webdev, tutorial, beginners | ## **Introduction**
Consider a situation where you require a function that retains its state between calls. This can be achieved using closures. JavaScript closures are a key concept that permits functions to utilize variables from their surrounding scope even after the outer function has finished executing. This guide will help you understand what closures are, how they work, and how to use them effectively in your JavaScript code.
## **What is a Closure?**
A closure is feature in JavaScript that allow a function to remember and access variables from its outer scope, even after the outer function has finished executing.
### Simple Explanation:
Imagine you have a box (a function) with some items inside it (variables). So, once you close the box, you cannot access the items inside from the outside. However, with closure, you have a magical way of reaching into the box and using those items even after the box is closed.
### Example:
Let us say we have a function that creates another function inside it.
```javascript
function outFunction() {
let count = 0; // variable inside "box"
function inFunction() {
count++; // inFunction changes the variable
console.log(count); // inFunction accesses the variable
}
return inFunction; // Returning the inFunction
}
const myCall = outFunction(); // We get the inFunction
myCall(); // Output: 1
myCall(); // Output: 2
```
### In this example:
outFunction is box and count variable is the item inside the box. inFunction is the magical way to reach inside the box and use count variable. When outFunction is called, it returns inFunction. Even though outFunction finishes executing, inFunction still remembers and can access count. So, every time when we call myCall, it increments and logs count value, showing that it remembers the variable from its outer scope.
In summary, a closure allows a function to continue accessing the variables from its outer function even after the outer function has completed. This is useful for creating functions that maintain their own private state or remember data between calls.
## **Common Use Cases for Closures**
### 1. Encapsulation: Keeping Data Private
Encapsulation is about keeping some data hidden and only accessible through specific functions. Closures can help create private variables that can't be accessed directly from outside the function.
```javascript
function outFunction() {
let count = 0; // variable inside "box"
function inFunction() {
count++; // inFunction changes the variable
console.log(count); // inFunction accesses the variable
}
return inFunction; // Returning the inFunction
}
const myCall = outFunction(); // We get the inFunction
myCall(); // Output: 1
myCall(); // Output: 2
```
In this example, count is not accessible directly but can be modified using the returned function.
### 2. Memoization: Optimizing Function Performance
Memoization is a technique where you store the results of expensive function calls and reuse them when the same inputs occur again. Closures can help keep these results in memory.
```javascript
function calculate(func) {
const cache = {};
return function(x) {
if (cache[x] === undefined) {
cache[x] = func(x); // Store the result in cache
}
return cache[x];
};
}
const square = calculate(function(x) { return x * x});
console.log(square(4)); // 16, computed and stored in cache
console.log(square(4)); // 16, retrieved from cache
```
In the above example when square is called for the first time with value 4 it is calculated and stored in the cache and when again square is called with 4 it is fetched from the cache and returned.
### 3. Callbacks and Event Handlers: Managing State
Closures are useful in asynchronous programming, such as when dealing with callbacks and event handlers, because they allow you to maintain state between invocations.
```javascript
function clickButton() {
let count = 0;
document.getElementById('clickButton').addEventListener('click', function() {
count++; // This closure keeps track of the count
console.log(`Button is clicked ${count} times`);
});
}
clickButton();
```
## **Memory Management with Closures**
### Memory Leaks
Closures can lead to memory leaks if they hold onto references to large objects or DOM elements that are no longer needed. This happens because the closure prevents the garbage collector from reclaiming the memory.
```javascript
function calculate(func) {
const cache = {};
return function(x) {
if (cache[x] === undefined) {
cache[x] = func(x); // Store the result in cache
}
return cache[x];
};
}
let square = calculate(function(x) { return x * x});
console.log(square(4)); // 16, computed and stored in cache
console.log(square(4)); // 16, retrieved from cache
square = null;
```
In above example even if we don't use square, it still remains in memory.
To avoid this we can set closure to null when it's no longer needed, you allow the JavaScript engine to release the associated memory.
## **Conclusion**
When it comes to coding, closures helps to improve the flexibility and effectiveness of your functions. but it's important to handle closures properly to avoid memory leaks. | mukeshb |
1,906,402 | Renderización Dinámica de Componentes en Vue 3 y Nuxt 3: Guía Práctica y Caso Real | Componentes dinámicos en Vue y Nuxt: Guía Práctica y Caso Real Nuxt 3 ofrece una forma... | 0 | 2024-06-30T08:22:00 | https://dev.to/nyambe/renderizacion-dinamica-de-componentes-en-vue-3-y-nuxt-3-guia-practica-y-caso-real-4054 | nuxt, espanol, vue, nuxt3 |
## Componentes dinámicos en Vue y Nuxt: Guía Práctica y Caso Real
Nuxt 3 ofrece una forma flexible y muy potente de renderizar diferentes componentes basados en condiciones dinámicas. Esto es especialmente útil cuando el componente exacto a renderizar no se puede determinar hasta el tiempo de ejecución.
## Configuración Básica
Para empezar, asegúrate de tener un componente que deseas resolver dinámicamente. Por ejemplo, supongamos que tenemos un componente llamado `MyButton` que queremos usar dinámicamente:
```typescript
<script setup lang="ts">
import { SomeComponent } from '#components'
const MyButton = resolveComponent('MyButton')
</script>
```
En el script anterior, usamos `resolveComponent` para resolver dinámicamente el componente `MyButton`. Este método es útil cuando los componentes necesitan cargarse de manera condicional o cuando se trata de aplicaciones grandes donde los componentes se cargan bajo demanda.
## Uso de Componentes Dinámicos en Plantillas
Una vez que hemos resuelto nuestros componentes, podemos usarlos en la sección de la plantilla. La etiqueta `<component>` en Vue 3 (y por lo tanto en Nuxt 3) permite la renderización dinámica de componentes. Aquí tienes un ejemplo:
```html
<template>
<component :is="clickable ? MyButton : 'div'" />
<component :is="SomeComponent" />
</template>
```
En esta plantilla:
1. La primera etiqueta `<component>` usa una operación ternaria para decidir si renderizar el componente `MyButton` o un simple elemento `div` basado en la condición `clickable`.
2. La segunda etiqueta `<component>` renderiza `SomeComponent` directamente.
## Explicación Técnica
- **`resolveComponent`**: Esta función se utiliza para resolver dinámicamente un componente por su nombre. Devuelve un componente que se puede usar en tu plantilla.
- **`<component :is="...">`**: Esta etiqueta especial de componente te permite especificar qué componente renderizar dinámicamente usando el atributo `:is`.
## Beneficios de los Componentes Dinámicos
- **Flexibilidad**: Los componentes dinámicos permiten a los desarrolladores crear aplicaciones más flexibles y modulares. Los componentes pueden renderizarse basándose en interacciones del usuario, el estado de la aplicación u otras condiciones dinámicas.
## Ejemplo en un Caso Real
En un caso real, necesitaba cargar dinámicamente componentes según la ruta. Aquí tienes un ejemplo de cómo se puede lograr esto:
```typescript
<script lang="ts" setup>
import { UiVerticalNavigation, UiNavigationAccordion, UiBreadCrumbs } from '#components';
const route = useRoute()
const component = route.params.component as string
const componentList = [
{
label: 'Vertical Navigation',
id: 'vertical-navigation',
component: UiVerticalNavigation
},
{
label: 'Navigation Links (PRO)',
id: 'navigation-accordion',
component: UiNavigationAccordion,
pro: true
},
{
label: 'Breadcrumbs',
id: 'breadcrumbs',
component: UiBreadCrumbs
}
]
const currentComponent = componentList.find(c => c.id === component)
</script>
<template>
<UContainer class="p-5 mt-32">
<div v-if="component && currentComponent">
<h1 class="text-4xl font-bold py-4">{{ currentComponent.label }}</h1>
<component :is="currentComponent.component" />
</div>
<div v-else class="">
<h1 class="text-4xl font-bold">Component not found</h1>
</div>
</UContainer>
</template>
<style>
</style>
```
En este ejemplo:
1. **Importación de Componentes**: Importamos los componentes que queremos renderizar dinámicamente (`UiVerticalNavigation`, `UiNavigationAccordion`, `UiBreadCrumbs`).
2. **Obtención de la Ruta**: Utilizamos `useRoute` para obtener la ruta actual y el parámetro `component` de la URL.
3. **Lista de Componentes**: Creamos una lista de componentes con sus etiquetas, identificadores y referencias a los componentes importados.
4. **Selección del Componente Actual**: Encontramos el componente actual en la lista basado en el identificador de la URL.
5. **Renderización en la Plantilla**: Utilizamos `<component :is="currentComponent.component" />` para renderizar el componente seleccionado dinámicamente. Si no se encuentra el componente, mostramos un mensaje de "Component not found".
Este enfoque permite que la aplicación cargue y renderice componentes específicos basados en la ruta actual, lo cual es útil para crear interfaces de usuario dinámicas y adaptativas.
## Conclusión
Usa componentes dinámicos, es un recurso que te puede ahorra muchos dolores de cabeza
| nyambe |
1,906,383 | window.ai - running AI LOCALLY from DevTools! 🤯 | On-device AI in the browser is here - kinda. It is currently in Chrome canary which means, it will... | 0 | 2024-06-30T08:17:39 | https://dev.to/grahamthedev/windowai-running-ai-locally-from-devtools-202j | ai, webdev, javascript | On-device AI in the browser is here - kinda.
It is currently in Chrome canary which means, it will be here soon(ish).
In this article I will show you how to get it running on your device, so that you can have a play with it and see what use cases you can think of.
And I will just say this: Running `window.ai` from DevTools **without an internet connection** is pretty fun, even if the results are "meh"!
## Setup
Getting up and running only takes 5 minutes!
### 1. Download Chrome Canary
Go to [the Chrome Canary site](https://www.google.com/intl/en_uk/chrome/canary/) and download Chrome Canary.
### 2. Enable "Prompt API for Gemini Nano".
Open Chrome Canary and type "chrome://flags/" in the URL bar and press <kbd>enter</kbd>.
Then in the search box at the top type "prompt API"
You should see "Prompt API for Gemini Nano" as the only option
Switch that to "enabled".
### 3. Enable "Enables optimization guide on device"
While you are on the "chrome://flags" page, you need to enable a second item.
Remove your previous search and search for "optimization guide on".
You should see "Enables optimization guide on device" as your only option.
This time you want to enable it, but with the "Enabled ByPassPerfRequirement" option.
### 4. Install Gemini Nano
Last step, we need to install Gemini Nano on our device.
This is actually part of a bigger tool, but we don't need to worry about that, except for the fact that it helps us know what to download.
**Warning:** This file is 1.5gb. It doesn't tell you that anywhere so if you have a slow connection / pay per Gb of data / low storage space you may not want to do this!
Head to: "chrome://components/".
Hit <kbd>Ctrl</kbd> + <kbd>f</kbd> and search for "Optimization Guide".
You will see an item "Optimization Guide On Device Model".
Click "Check for Update" and it will install the file.
### 5. DONE!
Last step: Restart Chrome Canary for the changes to take effect.
Add that is it, now we can move on to using AI locally!
## Using `window.ai`
If everything worked as expected then you should now be able to open DevTools (F12), go to the "Console" tab and start playing!
The easiest way to check is to type `window.` into the console and see if `ai` comes up as an option.
If not, go back and check you didn't miss a step!
### Creating our first session.
Just one command is needed to start a session with our AI model.
``` js
const chatSession = await window.ai.createTextSession()
```
**Tip:** Don't forget the `await`. I did originally 🤦🏼♂️!
There is also an option of `createGenericSession()` but I haven't worked out what the difference is yet!
Now we can use that session to ask questions.
### Sending a prompt
For this we just use the `.prompt` function on our `chatSession` object!
``` js
const result = await chatSession.prompt("hi, what is your name?")
```
Yet again, all async, don't forget the `await` (I didn't make the same mistake twice...honest!).
Depending on the complexity of your prompt and your hardware this can take anywhere from a few milliseconds to several seconds, but you should eventually see `undefined` in the console once it has done.
### Getting the response.
Now we just have to `console.log` the `result`!
``` js
console.log(result)
```
And we get:
```
As a large language model, I do not have a name.
```
Pretty underwhelming, but at least it works!
### Quick and Dirty Reusable example
Obviously you don't want to have to keep sending multiple commands, so you can copy and paste this function into your console to make things easier:
``` js
async function askLocalGPT(promptText){
if(!window.chatSession){
console.log("starting chat session")
window.chatSession = await window.ai.createTextSession()
console.log("chat session created")
}
return console.log(await window.chatSession.prompt(promptText))
}
```
And now you can just type `askLocalGPT("prompt text")` into your console.
I personally have that saved as a snippet in `Sources > snippets` for quick access when I want to play with it.
Have fun!
## Is it any good?
No
## Really? It isn't any good?
I mean, it depends on the measuring stick you are using.
If you are trying to compare it to Claude or ChatGPT, it is terrible.
However for local playing and experimentation it is awesome!
Also bear in mind that each time you ask a question, it does not automatically have memory of what you asked previously.
So if you want to have a conversation where the model "remembers" what was said previously you need to feed previous questions and answers in with your new question.
## Is it fun to play with?
Yes.
The fact I can get it to work locally in my browser is pretty cool. Plus it can do simple coding questions etc.
And the beauty is no big bills! You can use the full 32k context window as often as you want without worrying about racking up a big bill by mistake.
Oh and while I said it isn't very good, it can do summaries quite well:
``` js
askLocalGPT("can you summarise this HTML
for me please and explain what the page is
about etc, please return a plain text response
with the summary and nothing else:" + document.querySelector('article').textContent.toString())
```
And with a little playing it outputs:
> This article explains how to run window.ai locally in your browser using Google's large language model (LGBL).
>
> It describes the necessary steps, including enabling the "Prompt API for Gemini Nano" and "Optimization Guide on Device Model" flags in Google Chrome Canary, installing Gemini Nano, and restarting Chrome Canary.
>
>The article then demonstrates how to use window.ai by creating a text session, prompting the AI model, and receiving the response. It concludes by discussing the possibilities and future enhancements of window.ai.
## What will you build?
I have only just scratched the surface of the new API, but I can see it being really handy for creating "custom GPTs" for your own use for now.
In the future once AI is available in-browser for everybody, who knows what amazing things will be created.
## Final thought
While I find this exciting as a developer and the possibilities it opens up, there is a large part of me that dislikes / is cautious of this.
People are already throwing "AI" into everything for no reason. Having it run locally on people's machines will only encourage them to use it for even stupider things!
Plus there are probably about 50 other things around security, remote AI farms, etc. etc. that are likely to make me cry in the future the more I think about it.
| grahamthedev |
1,906,401 | Latest Newsletter: Liberalism, Free Speech, and Even More Politics (Issue #170) | AR & VR, memecoins, macro, digital media publications, liberalism, national debt, history of elections, free speech, state dysfunction, resolving disputes, UK politics, authoritarianism, sad tech | 0 | 2024-06-30T08:14:09 | https://dev.to/mjgs/latest-newsletter-liberalism-free-speech-and-even-more-politics-issue-170-mln | javascript, tech, webdev, discuss | ---
title: Latest Newsletter: Liberalism, Free Speech, and Even More Politics (Issue #170)
published: true
description: AR & VR, memecoins, macro, digital media publications, liberalism, national debt, history of elections, free speech, state dysfunction, resolving disputes, UK politics, authoritarianism, sad tech
tags: javascript, tech, webdev, discuss
---
Latest Newsletter: Liberalism, Free Speech, and Even More Politics (Issue #170)
AR & VR, memecoins, macro, digital media publications, liberalism, national debt, history of elections, free speech, state dysfunction, resolving disputes, UK politics, authoritarianism, sad tech
https://markjgsmith.substack.com/p/saturday-29th-june-2024-liberalism
Would love to hear any comments and feedback you have.
[@markjgsmith](https://twitter.com/markjgsmith) | mjgs |
1,906,400 | TNod User & Password Finder 1.8.0 Final Beta Cracked Free Download | In today's digital age, securing access to premium software often comes at a cost. However, tools... | 0 | 2024-06-30T08:14:06 | https://dev.to/ownsoftware/tnod-user-password-finder-180-final-beta-cracked-free-download-2m3h | In today's digital age, securing access to premium software often comes at a cost. However, tools like TNod User & Password Finder 1.8.0 Final Beta provide a solution by enabling users to find valid license keys for ESET antivirus products. This article explores the features, benefits, and downloading process of [TNod User & Password Finder 1.8.0 beta cracked version](https://owncracks.com/tnod-user-password-finder/), while ensuring good readability and SEO.
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By keeping ESET software activated and up-to-date, TNod helps maintain the security of the user's device, protecting it from malware and other threats.
## How to Download and Install TNod User & Password Finder 1.8.0 Final Beta?
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Download from given link and TNod User & Password Finder 1.8.0 Final Beta is available for download.
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After installation, open TNod User & Password Finder.
Configure the settings according to your preferences. You can set it to run at startup and automatically search for keys.
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Ensure that the antivirus software is now activated and functioning correctly.
## Troubleshooting Common Issues
**1. TNod Not Finding Keys:**
If TNod is unable to find valid keys, try the following steps:
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Check for any updates to TNod and install them.
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**Conclusion**
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| jesonjame | |
1,906,399 | High-Speed Facebook to MP4 Conversion with FBload | Experience the fastest way to convert Facebook videos to MP4 with FBload. Our advanced technology... | 0 | 2024-06-30T08:08:52 | https://dev.to/gloriahewitt/high-speed-facebook-to-mp4-conversion-with-fbload-363l | Experience the fastest way to convert [Facebook videos to MP4](https://fbload.online/fb-to-mp4) with FBload. Our advanced technology guarantees high-speed conversions without compromising video quality, always providing the best results. | gloriahewitt | |
1,906,397 | Luhn's Algorithm: Credit Card Validation | The challenge At some point in my backend journey, I was faced with the challenge to... | 0 | 2024-06-30T07:58:28 | https://dev.to/talk2onyx/luhns-algorithm-credit-card-validation-2plk | programming, laravel, algorithms | ## The challenge
At some point in my backend journey, I was faced with the challenge to validate credit cards numbers, submitted by users on an application that processes subscription-based payment for a service.
Let’s imagine we are creating an e-commerce website. The site is looking good and we are ready to implement payments. The first step of the payment process is entering payment information. One of the possibilities is to pay with a credit card. We are using an external payment system to process the payments, and the external system has a limited number of payments it can process per time.
To reduce the strain on the external payment system (caused by incorrect credit card details being entered), we are supposed to implement a second validation system which runs on the server and is not limited. This system is intended to perform simple sanity checks of the credit card information and respond with either a success or failure.
The task is to implement a simple page with an input form to take in credit card information and send it to a Backend API for validation.
The Backend API should respond with either success or failure, and we should react appropriately in the Frontend (e.g. display a green check mark or a stop sign).
Here is an example of a validation algorithm that can be used:
1. The expiry date of the credit card (year and month) must be AFTER present time
2. The CVV (security code) of the credit card must be exactly 3 digits long
- Unless it’s an American Express card, in which case the CVV must be exactly 4 digits long
- American Express are cards whose PAN (card numbers) starts with either “34” or “37”
3. The PAN (card number) is between 16 and 19 digits long
4. Last digit of the PAN (card number) is checked using Luhn’s algorithm.
## Solution
I implemented the Luhn's algorithm to validate the credit card information requests coming from the frontend. Here's my implementation in PHP, Laravel to be specific.
```
<?php
namespace App\Http\Controllers;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Validator;
class CreditCardController extends Controller
{
public function validateCreditCard(Request $request): JsonResponse
{
$validator = Validator::make($request->all(), [
'creditCardNumber' => [
'required',
'numeric',
'digits_between:16,19',
function ($attribute, $value, $fail) {
$cardNumbers = array_map('intval', array_reverse(str_split($value)));
for ($i = 0; $i < count($cardNumbers); $i++) {
if (($i % 2) !== 0) {
$cardNumbers[$i] *= 2;
if($cardNumbers[$i] > 9)
{
$cardNumbers[$i] -= 9;
}
}
}
if (array_sum($cardNumbers) % 10 !== 0) {
$fail('The :attribute is incorrect or invalid.');
}
},
],
'expiryDate' => [
'required',
'regex:/^(0[1-9]|1[0-2])\/([0-9]{2})$/',
function ($attribute, $value, $fail) {
$expiry = Carbon::createFromFormat('m/y', $value);
$currentDate = Carbon::now();
if (!$expiry || $expiry->lessThan($currentDate)) {
$fail('The :attribute is invalid or has already expired.');
}
},
],
'cvv' => [
'required',
'numeric',
function ($attribute, $value, $fail) use ($request){
$cardType = $this->getCardType($request->input('creditCardNumber'));
if ($cardType === 'amex') {
if (strlen($value) !== 4) {
$fail('The :attribute must be a 4-digit number for American Express cards.');
}
} else {
if (strlen($value) !== 3) {
$fail('The :attribute must be a 3-digit number.');
}
}
}
],
]);
if ($validator->fails()) {
return response()->json(['errors' => $validator->errors()], 422);
}
return response()->json([...$validator->validated(), 'validation_success' => 'true'], 200);
}
private function getCardType($cardNumber)
{
$cardTypeDigits = substr($cardNumber, 0, 2);
if (str_contains($cardTypeDigits, '34') || str_contains($cardTypeDigits, '37')) {
return 'amex';
} elseif (str_starts_with($cardNumber, '4')) {
return 'visa';
} elseif (str_starts_with($cardNumber, '5')) {
return 'mastercard';
}
return 'unknown';
}
}
```
I was delighted with my solution.
## Conclusion
After solving the task, it made me to want to learn more about backend engineering, and how complex systems work. I hope this [HNG program](https://hng.tech/internship) will provide the opportunity I need to deepen my knowledge on advanced backend concepts and get me my desired [job](https://hng.tech/hire). Thanks.
| talk2onyx |
1,906,366 | 100 Days of Code Week 1 | July 1, 2024 FSE 1 Web Development Foundations Get started with the foundations. By the... | 0 | 2024-06-30T07:49:45 | https://dev.to/jacobsternx/100-days-of-code-week-1-3igb | 100daysofcode, webdev, javascript, beginners | July 1, 2024
### FSE 1 Web Development Foundations
* Get started with the foundations. By the end of this section, you'll be able to build a stylized and responsive website with HTML and CSS
#### Fundamentals of HTML
* FSE 1.1 Web Dev - Fundamentals of HTML
#### Fundamentals of CSS
* FSE 1.2 Web Dev - Fundamentals of CSS
#### Developing Websites Locally
* FSE 1.3 Web Dev - Developing Websites Locally
#### Deploying Websites
* FSE 1.4 Web Dev - Deploying Websites
#### Improved Styling with CSS
* FSE 1.5 Web Dev - Improved Styling with CSS
#### Making a Website Responsive
* FSE 1.6 Web Dev - Making a Website Responsive
#### Web Development Foundations Review
* FSE 1.7 Web Dev - Review
#### Certification exam, Objective assessments I and II
This first Codecademy FSE Course is Web Development Foundations.
One thing that makes this course special is that I'm swinging to knock this course out this week.
Future weeks will have side quests to enhance the learning experience, like Signal Code to enhance PostgreSQL material in Course 4, but this week's lessons look straightforward, so let's put this one in the books.
One habit I'm emphasizing this week is attention to detail, evidenced in the syllabus above, and the following quote found on a markdown resource that spoke to me:
I'm super new here, and to #100DOC, and would like to meet others and hear your stories, so feel free to drop a link or share!
Cross posted: Dev.to `https://dev.to/jacobsternx` and LinkedIn.com `https://www.linkedin.com/in/jacobsternx`
| jacobsternx |
1,906,394 | AAct Portable Activator Free Download: Your Ultimate Guide | In today’s digital age, activation of software plays a crucial role in ensuring that you get the most... | 0 | 2024-06-30T07:43:07 | https://dev.to/roseberry/aact-portable-activator-free-download-your-ultimate-guide-4114 | software, productivity | In today’s digital age, activation of software plays a crucial role in ensuring that you get the most out of your applications. One such tool that has gained popularity is the [AAct Portable Activator 4.3.1 Cracked](https://owncracks.com/aact-portable-activator-crack/). This article will provide a comprehensive guide on what AAct Portable Activator is, how to download it for free, and its benefits and risks.
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## What is AAct Portable Activator?
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Ease of Use: The straightforward interface makes it easy for anyone to use, regardless of their technical expertise.
Time-Saving: The activation process is quick, often taking just a few minutes, which can be a huge time-saver compared to other methods.
## Alternatives to AAct Portable Activator
If you are hesitant about using AAct Portable Activator, there are alternative methods to consider:
Official Microsoft Activation: The safest and most reliable method is to purchase a genuine license from Microsoft. This ensures you receive official support and updates.
KMS Activation: Key Management Service (KMS) is a legitimate way to activate Windows and Office for large organizations. This method requires setting up a KMS server, which may not be practical for individual users.
Digital License Activation: Some versions of Windows 10 can be activated using a digital license linked to your Microsoft account. This method is straightforward and secure.
## Conclusion
AAct Portable Activator is a powerful tool that offers a quick and convenient way to activate Windows and Microsoft Office. While it has numerous benefits, including being free and easy to use, it’s essential to be aware of the potential risks and legal implications. Always download from reliable sources, use antivirus protection, and consider the alternatives if you are concerned about legality or security. With the right precautions, AAct Portable Activator can be a valuable tool in your software toolkit.
| roseberry |
1,906,392 | Scaling databases with AWS RDS and read replicas | Amazon Web Services (AWS) Relational Database Service (RDS) is a managed service that simplifies the... | 0 | 2024-06-30T07:41:42 | https://dev.to/vivekalhat/scaling-databases-with-aws-rds-and-read-replicas-58h9 | aws, cloud, database, tutorial | Amazon Web Services (AWS) Relational Database Service (RDS) is a managed service that simplifies the process of configuring, operating, and scaling a relational database in the cloud. AWS RDS is a versatile choice that supports several database engines including PostgreSQL, MySQL, Oracle, MariaDB, Microsoft SQL Server, and Amazon's own Aurora.
### Advantages of using RDS over a self hosted database
- **Managed Service** - AWS RDS is a fully managed service, which means that AWS takes care of provisioning, patching, backup, recovery, and even scaling. This allows developers and database administrators to focus on the application development and optimization rather than managing the underlying infrastructure.
- **Continuous Backups** - RDS provides continuous backups based on a defined retention period. It ensures that your data is always protected and can be restored when necessary. This automatic backup process eliminates the risk of data loss due to unforeseen events.
- **Point in Time Restore** - With RDS, you can restore your database to any specific point within your backup retention period.
- **Read Replicas** - RDS supports the creation of read-only replicas of the master database. This helps in reducing the load on the primary database. Read replicas are ideal for read-heavy applications. This helps in distributing the read traffic and increasing the performance.
- **Monitoring Dashboards** - AWS CloudWatch integration allows you to monitor key metrics such as network traffic, CPU utilization, disk I/O, and memory usage without the need of any third-party tools.
### Creating a new database
AWS RDS provides two methods for creating a new database.
- **Standard create** - You can set all the configuration options including for availability, security, backups and maintenance. You have full control on configuring your database needs.
- **Easy create** - It uses recommended best-practice configurations. Some configurable options can be changed even after the database is created.
Let's create a new PostgreSQL database using easy create method.
- Select `Easy create` method for database creation.
- Select `PostgreSQL` as a database engine.
- Select your preferred database instance size. You can select either production, dev/test, or free tier if applicable.
- Add a name for your database instance and for master user.
- You can configure the credentials manager as AWS Secrets Manager or self manage the credentials.
- Click on `Create database` option to create your new `PostgreSQL` database.
- It takes a couple of minutes to get a new database up and running on AWS cloud.
### Auto Scaling RDS
RDS Auto Scaling helps in dynamically increasing the storage capacity of your database instance without manual intervention. This feature is particularly useful for applications with unpredictable workloads. You can set `Maximum Storage Threshold`, which is the highest limit for database storage to prevent infinite scaling.
RDS auto scales under the following conditions:
1. Storage is less than 10%.
2. Low storage lasts for at least 5 minutes.
3. 6 hours have passed since the last storage modification.
### Read Replica
Read replica is one of the powerful feature of RDS that allow you to create up to 15 read-only copies of your primary database. These replicas can be located within the same availability zone (AZ), across different AZs, or even in different regions.
Key benefits of using Read Replicas:
1. You can offload the read traffic to read replicas. This significantly reduces the load on primary database thus enhances overall performance.
2. Read replicas can be promoted to a standalone database in case of a failure of the primary database. It helps in disaster recovery.
3. You can scale your read-heavy applications by distributing read traffic across multiple replicas.
Following things you should consider while creating a replica:
1. Data replication to read replicas is asynchronous. It means there could be a slight delay which is also known as replication lag before changes in the primary database are reflected in the replicas.
2. Applications must use the specific connections strings for read replicas to route the read traffic appropriately.
3. Replication within the same region is free but cross region replication incurs additional cost.
Let's create a read replica of the database that we created before.
- Select `Create read replica` option from the actions menu of database homepage.
- Select the replica source and add a replica database instance identifier.
- You can select the destination region where the replica will be launched.
- Configure other settings as required and click on `Create read replica` option to create a read replica of your primary database instance.
### RDS Multi AZ for Disaster Recovery
RDS multi AZ deployments provide high availability and reliability for database instances. In a multi AZ setup, any changes made to the primary database are synchronously replicated to a standby instance in a different availability zone (AZ). This ensures that the standby instance in another AZ is always up-to-date with the primary database.
Key features of multi AZ deployments:
- **Automatic Failover** - In the event of a failure in the primary database, RDS automatically switches to the standby instance in another AZ. This ensures continuous operation with minimal downtime.
- **High Availability** - Multi AZ deployments are designed for high availability and disaster recovery. They are not meant for scaling read operations. However, you can combine multi AZ setup with read replicas for additional disaster recovery capabilities.
You can refer the official user [guide](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html) to learn more about AWS RDS. | vivekalhat |
1,906,393 | Exclusive Interview With John Lilic: His Path to Web3, the Evolution of Blockchain, And the Value of Partnerships | In recent decades, technological innovations have changed the way we think about finance, networking,... | 0 | 2024-06-30T07:38:06 | https://36crypto.com/exclusive-interview-with-john-lilic-his-path-to-web3-the-evolution-of-blockchain-and-the-value-of-partnerships/ | cryptocurrency, blockchain, interview | In recent decades, technological innovations have changed the way we think about finance, networking, and personal security. Among the most impressive achievements of this time are the development of blockchain technology and Web3. What started as a cryptocurrency concept quickly grew into a profound transformation of various areas of the economy and social life.
To delve deeper into this rapidly evolving landscape, I asked [John Lilic](https://www.johnlilic.info/) to share his perspective on the evolution of blockchain technology and Web3. Exclusive insights from the Executive Director of Telos, a key contributor of ConsenSys and Polygon, and one of Web3’s top 150 angel investors.
**Q: Can you walk us through your journey from being involved with the NYC Bitcoin Center to becoming a key member at ConsenSys and Polygon? What were the pivotal moments in your career that shaped your focus on blockchain and Web3 technologies?**
I found out about the Bitcoin center sometime in late 2013. At this point, I had already moved to New York, mostly because, at that time, the only robust community where there were BitDev meetups was New York. I mean, there were some meetups in Amsterdam and San Francisco, but New York was having lots and lots of BitDev meetups.
So I went and met a guy named Nick Spanos. He was one of the biggest commercial real estate brokers in New York; he used to own a real estate agency called Bapple. He was an early Bitcoin guy and was also involved with the Ron Paul campaign. So I met a lot of these libertarian guys early on because of Bitcoin. They found out about Bitcoin through this newsletter circulating, which was called Run to Gold, advocating the benefits of gold relative to the fiat monetary and fractional reserve monetary systems.
So he rented a place, a massive venue right next to the New York Stock Exchange on 40 Broad Street, and I volunteered there. I spent all of 2014 as a volunteer at the Bitcoin Center. It was an educational center. We used to just do open, peer-to-peer trading on the street there, right on Wall Street. There was a bunch of media coverage later. Morgan Spurlock did a big, basically hour-long feature that was on CNN.
Nathaniel Popper, the New York Times writer, was there all the time. He wrote his early book, his first Bitcoin book, basically by coming to the Bitcoin Center and meeting everybody. Later, Chris Canuzziari created a film called Banking on Bitcoin, which went on Netflix. I’m actually in that film. So it was just a focal point for Bitcoin at that time, and I was fortunate enough to be volunteering there. Of course, we were doing meetups every week, multiple days a week, and so early Bitcoin and crypto pioneers would come: Bryan Armstrong, Jesse Powell, and the CEO of Kraken.
That’s where I met Joe Lubin and heard about Ethereum. He told me he was starting this thing called ConsenSys. The first employee of ConsenSys is a young lady named Ashley Taylor. So that’s where I met Joe and Ashley, and I started working for ConsenSys in early 2015. Although, I was following Ethereum throughout the middle part onward of 2014. So I spent six years intensely working at ConsenSys from 2015 until the end of 2020.
While I was at ConsenSys, I was doing a bunch of things, I helped build our enterprise business. So basically, ConsenSys in October 2015 signed a global partnership with Microsoft. We helped develop the enterprise Ethereum Alliance with all the big Fortune 500s who joined. We formed partnerships with big corporates around the world, including RWE, the largest utility in Germany. I helped develop a bunch of projects. I did biz dev for many years and fundraising as well. And, by, let’s say, 2016-17, I was doing lots of research on L2.
I found a guy on Twitter, this guy named Mihailo, who at the time had a few hundred followers. He was like this obscure kind of, I mean, a little bit weird, but super cool guy. And he was talking about scaling Ethereum with a Swiss army knife solution. In other words, multiple scaling solutions in one network. His original concept was called NETH. He was living in Belgrade, Serbia, so I would go to Belgrade in 2016–2019.
He was doing a lot of research, I was hanging out with him. He became like one of my best friends. He was going to take NETH forward on his own, and I pitched it to ConsenSys, but our VC decision-makers decided to pass on it. So I left at the end of 2020. At that point, Mihailo had gotten with the MATIC guys, a couple of Indian guys who launched a POS Plasma side chain in 2017.
And together, alongside a few other kinds of well-known Ethereum people—a guy named Hudson, Pete Kim, the guy who built the Coinbase wallet, RSA, the bankless guy, and later Mark Cuban, myself—we became kind of the face or the advisors of Polygon. We rebranded, and then the whole thing kind of exploded in 2021. So that’s kind of the story of Bitcoin Center, ConsenSys, and Polygon.
In terms of pivotal moments, there’ve been lots of them, I would say. But definitely, let’s say, from 2010 to 2012, I was doing lots of e-commerce. I was doing all sorts of different e-commerce things, like buying domain names and doing search engine optimization. I had a payment system on my website, so I could accept credit card payments. I would take orders for various items before Amazon sort of ate the world.
Then I would plug into the manufacturers, who would drop-ship directly, and I would earn a small commission. Well, one day, the bank shut me down. They closed my merchant services account and frozen my bank account, froze my money for nine months. They said, We know you’re not doing anything illegal, but you’re hurting our reputation. At the time, I was with a big bank in the UK, very famous for laundering tens of billions of dollars of Mexican drug cartel money. It was an unbelievable moment towards the end of 2012.
But actually, it wasn’t so funny because my money was frozen. My business died. I didn’t have any money, literally none for nine months. I had to get my dad to Western Union money just so I could buy groceries. And I thought having a bank account was like a human right or something. But that’s where I learned it’s not, and how fragile the whole thing is. So in some weird way, I got canceled. But it was at the time the worst thing I couldn’t even do.
I was so stressed out, but it turned out to be a great blessing because it forced me to look for alternatives. I quickly realized PayPal is not an alternative. And I discovered Bitcoin sort of in the early part of 2013. I got obsessed with it and that was kind of like a pivotal moment.
**Q: With your experience as an early member of ConsenSys and an early adopter of Polygon, how have you seen the blockchain and Web3 space evolve over the years? What excites you most about its current trajectory?**
I would say the biggest thing is in terms of how I’ve seen the space evolve—just the level of competition. It’s tremendous. In the very early days, there weren’t many of us, and some great people were working very hard and being very talented, but it wasn’t anything like today. So the level of competition, the intensity, the pace at which innovation happens—just everything’s happening so much faster. We now have quantum physicists who are in our space, for example. So the level of competition has increased significantly, and the pace of evolution and development has increased dramatically. So those are two of the main, I would say, changes.
What excites me about that trajectory is just going into the future; obviously, we’re approaching quantum, we’ve got AI, and we’ve got a convergence of lots of tremendous technologies. So I think everything is going to get way more weird and exciting, and I’m very curious to see how it all sort of develops.
**Q: You are one of Web3’s top 150 angel investors, what criteria do you typically look for when considering investment opportunities in blockchain projects? How do you identify potential winners in a rapidly evolving ecosystem?**
I always say that my investment thesis, my entire strategy, is to be stupid and be lucky. So that’s kind of like what I do. I’m stupid, and I’m lucky. Stupid in the sense that you don’t want to like mid-wit, a lot of things. In other words, when you meet really smart people who have a great work ethic, you should invest in them. It’s very simple.
And maybe what they’re doing doesn’t work out, but you should still invest in those people. And so it’s less about the project and more about the people, for me. I think as long as I stick to that recipe, eventually, I’m gonna get lucky. And that’s pretty much my entire strategy.
**Q: You advocate Zero Knowledge (ZK) technology. Could you tell us why ZK technology is considered the future of blockchain? What specific achievements or opportunities do you think it allows you to realize on a scale that is not available to traditional blockchain systems?**
I think ZK is part of the future of blockchain because you sort of think about AI, and you think about AI and blockchain. So intelligent systems are going on chain, sort of like doing all kinds of things, competing and out-competing. I mean, you can imagine, when we get to a certain point, that all financial institutions will be offloading decision-making as far as how they go in the markets and compete with these two super-intelligent systems. And those systems will necessarily demand fully provable infrastructure. Fully provable is important because it’s one of the things that ZK can kind of enable.
There’s the scalability side of things and sort of data protection, but also makes it very hard or essentially impossible for others to improperly manipulate the system and/or make claims that are not true, against which you assume risk. Where, in fact, with a fully provable infrastructure, it’s very, very hard to do that. So I think once you sort of see that, it’s very hard to unsee it. So fully provable infrastructure is something that I think AI will necessarily demand. And that’s kind of why I think ZK is the future of blockchain.
**Q: SNARK Proving ASICs are a relatively niche topic. Could you explain what they are and how they will contribute to the evolution of zero-knowledge technology? What advantages do ASICs bring to SNARK Proving that traditional computing methods cannot?**
Concerning SNARK Proving ASICs, I mean, I think we have a ways to go. There’s going to be an FPGA interim step, in other words, programmable chips. But basically, you look at Ethereum right now in its current state, and it’s quite a poor ZK execution environment for a lot of reasons. Likewise, you look at some of the competing monsters that are coming, like Aleo, Monad, and others. These are purpose-built ZK systems that sort of happen to be blockchains rather than a blockchain that was created 10+ years ago where a ZK ecosystem has since emerged. Taking a hardware/software co-design approach from the start is very critical, very important so that you can accelerate effectively. Eventually, the dream is to get to a system-on-chip design, where the entire ZK system is on a board.
So, the proving is done by the ASICs. It’s done in a hyper-efficient way at a low cost. In doing so, you can achieve some of these performance characteristics, which are going to be necessary for the user to have a good experience. I think in particular proving, and doing proofs are hard and they’re very expensive. They require a lot of computing. The extent to which you end up with software, hardware that’s specialized in this direction, and the extent to which you then optimize software in a code as a hardware-software co-design approach I think is the way to get to a place where you can do ZK proofs efficiently, quickly, and cheaply. So that the user experience is fast, low cost, and not cumbersome and expensive like what we have today.
**Q: Web3 is developing very rapidly, and projects such as Solidity, WB Soul, Web3.js, etc. are becoming more and more popular. How do you see the future of Web3, and what potential opportunities or obstacles do you foresee for developers in this area? And what projects do you think are worth paying attention to?**
I think the single biggest, why I love Solidity, I think it’s great. The vast majority of developers on the planet don’t use Solidity. And so the extent to which VMs can go in a direction where you can program in any language, I think, is very exciting. I think that’s sort of the future and it seems inevitable. Solidity also has limits. I mean, you can reach the limits of solidity pretty quickly. We did so at ConsenSys even in 2015, and 2016, trying to experiment with some stuff.
So I think as the community moves forward, and I’m not just talking about Ethereum, I’m talking about Web3 in general. As we try to onboard the rest of the world and all the rest of the developers in the world, we have to be mindful that the vast majority of them don’t use Solidity. So, how can we make virtual machines in such a way that other programming languages that developers are using can be utilized as well? I would say that’s probably the biggest area that I’m paying attention to.
**Q: You collaborate with such large corporations as Google, Github, and PwC. Could you tell us how successful such partnerships are in promoting projects? And how does it affect community engagement?**
Collaborating with large corporations is interesting on the one hand. I mean, the ones you mentioned—that’s in the context of partnering with my nonprofit. And so in that context, they’ve all been very, very helpful. We built the first coding school in Afghanistan for girls. It’s been about 10 years now. We put hundreds of them through the program. We’ve employed many of them. And so the large corporations have contributed donations—cash donations, donations in kind—and also employed some of the girls who qualify. So they’ve been nothing short of spectacular. And we hope to continue working with them.
**Q: What were some of the key lessons or experiences you gained from being an early member of ConsenSys and an adopter of Polygon? How have these experiences influenced your current work with the Telos Foundation?**
Being an early member of ConsenSys and Polygon there’s this tendency towards bloating the organization. People feel good once they’re successful, once there’s some validation. And the first kind of instinct is to hire tremendous amounts of people. At ConsenSys, we went from 60–80 people, maybe, to 1,800 people in like, I don’t know, a year and a half. And I think that was a big mistake. So growing too fast and adding more people doesn’t necessarily add better results. Lots of the innovation that happened was just small, two- or three-person teams. So I think fighting and resisting that tendency, I won’t.
I love Polygon very much. I think it’s a great project, but they also hired a tremendous amount of people. They hired a huge number of people at Polygon Labs and have publicly been winding that down. I mean, that’s public information. I think, resisting the urge to hire a tremendous amount of people when you don’t have to isn’t to say you shouldn’t hire. You should hire, but you should also be smart. You should also take into account that maybe less is more sometimes. And you should be hiring proportionate to your growth and what your organization needs. I think that’s the biggest lesson.
**Q: You’ve met with industry influencers like Joseph Lubin and Ashley Taylor. Are there any current leaders in the field of new technologies that you regularly follow or are inspired by?**
The guy I’m inspired by the most right now is Alberto Garoffolo, the ZK lead at Telos. He’s the guy who developed Snartor. The wonderful, very smart guy works tremendously hard, super easy to get along with, and he’s just wonderful. He’s got a partner in crime, a guy named Daniel Di Tullio. A mathematician, very humble, super nice. And then the guys at Pono’s Technologies. So Slobodan, the CEO, Milos, the CTO, a few of these other guys. Very, very smart. I mean, they’re all PhDs. They work hard and they’re very humble. And those are my heroes these days.
**Q: Looking back at your career so far, what achievements are you most proud of, and what do you hope to accomplish in the future within the blockchain and technology sectors?**
I guess the thing I’m very proud of, is the work we did at ConsenSys early on. It started with a few of us in a small co-working space. And of course, Ethereum was just a baby. Today, it’s a global network. I’m very, very proud of the kind of growth we’ve been able to accelerate.
Likewise, at Polygon, very proud of Mihailo. I saw him working just day and night. He was like a broke student. All he did was research for years, and he stayed with it. He didn’t like to deviate and chase ICOmania and all these other things. No, no, he just stuck to it, and eventually it paid off. And I think his determination is very inspiring for me. So he’s somebody that I’m very proud to have worked with and helped enable to some extent. But really, he helped enable me.
And then, of course, the nonprofit Code to Inspire. I’m very proud. We’re 10+ years into it. We’ve been grinding through, we’ve put 700 students through the program, and we’re gonna continue working there. I’m very proud of Fereshteh. She’s the founder. I’m her co-founder, but it’s her project that I’m just supporting. And yeah, she’s somebody I’m very, very proud of in that organization. I hope we’ll continue for many more decades.
| deniz_tutku |
1,904,998 | How to Customize GitHub Profile: Part 4 | Welcome back to the fourth part of my series on customizing your GitHub profile! In this article,... | 0 | 2024-06-30T07:33:48 | https://dev.to/ryoichihomma/how-to-customize-github-profile-part-4-29h | github, githubprofile, githubportfolio, developer | Welcome back to the fourth part of my series on customizing your GitHub profile! In this article, we'll delve into the fun and interactive contribution animation. This animation not only adds a unique flair to your profile but also visually represents your contributions in an engaging way.
[Part 1](https://dev.to/ryoichihomma/how-to-customize-github-profile-like-a-pro-16aa) | [Part 2](https://dev.to/ryoichihomma/how-to-customize-your-github-profile-part-2-32g2) | [Part 3](https://dev.to/ryoichihomma/how-to-customize-your-github-profile-part-3-37em) | [Part 5](https://dev.to/ryoichihomma/how-to-customize-github-profile-part-5-23po)
## Add Snake Contribution Animation and Why
The snake contribution animation is a creative way to showcase your GitHub activity. It adds a playful element to your profile while highlighting your commitment and consistency in contributing to open source projects.
1. **Engagement:** The animation captures the attention of visitors.
2. **Interactivity:** It provides a dynamic element to your otherwise static profile.
3. **Visual Appeal:** It makes your contribution graph more interesting and visually appealing.
## Setting Up the Snake Contribution Animation:
To add the snake contribution animation to your GitHub profile, you can use GitHub Actions and a pre-made script that generates the animation. Here's how you can set it up:
### Step1: Create a GitHub Actions Workflow
1. Go to your GitHub repository.
2. Navigate to the **Actions** tab.
3. Click on **New workflow**, then **set up a workflow yourself**.
### Step 2: Add the Workflow Code
To add the workflow code into your workflow file (e.g., **github/workflows/snakeAnime.yml**), please refer to [Platane's Repository](https://github.com/Platane/snk).
### Step 3: Add the Animation to Your README.md File
Once the GitHub Actions workflow is set up and runs successfully, you can add the generated SVG file to your README.md file. Here's how:
```
<!-- CONTRIBUTIONS -->
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/YOUR_GITHUB_USERNAME/YOUR_GITHUB_USERNAME/output/github-contribution-grid-snake-dark.svg">
<source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/YOUR_GITHUB_USERNAME/YOUR_GITHUB_USERNAME/output/github-contribution-grid-snake.svg">
<img alt="Contribution Animation" src="https://raw.githubusercontent.com/YOUR_GITHUB_USERNAME/YOUR_GITHUB_USERNAME/output/github-contribution-grid-snake.svg">
</picture>
```
## Customize the Snake Contribution Animation
You can customize the animation's appearance by adjusting the colors and the schedule in the workflow file. Here're a few customization options:
1. **Schedule:** Change the **cron** expression to adjust how often the animation updates.
2. **Colors:** Modify the **source** URLs to use different color schemes.
### Wrapping Up
In this part, we explored how to add the snake contribution animation to your GitHub profile. This fun and interactive element not only highlights your contributions but also enhances the visual appeal of your profile. Stay tuned for the last part, where we'll cover showcasing GitHub Stats and other insightful metrics.
As always, feel free to ask any questions or share your GitHub profiles in the comments below. Let's connect and grow together🌱
Happy coding!💻
#### Reference
[Platane's Repository](https://github.com/Platane/snk)
##### Other Parts
[Part 1](https://dev.to/ryoichihomma/how-to-customize-github-profile-like-a-pro-16aa) | [Part 2](https://dev.to/ryoichihomma/how-to-customize-your-github-profile-part-2-32g2) | [Part 3](https://dev.to/ryoichihomma/how-to-customize-your-github-profile-part-3-37em) | [Part 5](https://dev.to/ryoichihomma/how-to-customize-github-profile-part-5-23po)
| ryoichihomma |
1,906,391 | Running Livebook as a Systemd Service for Your User | Livebook is a powerful tool for creating and sharing interactive notebooks with Elixir. To make it... | 0 | 2024-06-30T07:32:15 | https://dev.to/dkuku/running-livebook-as-a-systemd-service-for-your-user-1b9c | livebook, linux, elixir | Livebook is a powerful tool for creating and sharing interactive notebooks with Elixir. To make it even more convenient, you can set it up to run as a systemd service for your user. This ensures that Livebook starts automatically whenever you log in, and runs in the background without requiring root permissions. Here’s a step-by-step guide to help you get started.
## Step 1: Install Livebook
First, ensure you have Livebook installed. You can install it via Elixir’s package manager, mix, by running:
```sh
mix escript.install hex livebook
```
## Step 2: Create a User Systemd Service File
Systemd allows users to manage their own services. User-specific service files are stored in `~/.config/systemd/user/`.
```sh
mkdir -p ~/.config/systemd/user
nano ~/.config/systemd/user/livebook.service
```
## Step 3: Define the Service Configuration
Add the following content to the `livebook.service` file (replace USER and PASSWORD):
```ini
[Unit]
Description=Livebook Service
[Service]
Type=simple
ExecStart=/home/__USER__/.asdf/shims/livebook server
Restart=on-failure
Environment=HOME=%h
Environment=MIX_ENV=prod
Environment=PATH=/home/USER/.asdf/shims:/usr/local/bin:/usr/bin:/bin
Environment=LIVEBOOK_HOME=%h/livemd
Environment=LIVEBOOK_PASSWORD=__PASSWORD__
Environment=LIVEBOOK_PORT=8090
Environment=LIVEBOOK_IFRAME_PORT=8091
[Install]
WantedBy=default.target
```
**Explanation**:
- `ExecStart`: The command to start Livebook. Ensure the path to the Livebook binary is correct.
- `Environment`: Sets necessary environment variables. `%h` will expand to the user’s home directory.
## Step 4: Reload User Systemd Configuration
After creating the service file, reload the systemd user configuration.
```sh
systemctl --user daemon-reload
```
## Step 5: Enable the Service for Your User
Enable the service to start on user login.
```sh
systemctl --user enable livebook.service
```
## Step 6: Start the Service for Your User
Start the Livebook service.
```sh
systemctl --user start livebook.service
```
## Step 7: Check the Service Status
Verify that the service is running.
```sh
systemctl --user status livebook.service
```
## Step 8: Enable User Systemd Services on Boot
Ensure that user services are started automatically at boot. You can enable lingering for your user:
```sh
sudo loginctl enable-linger USER
```
Replace `USER` with your actual username.
## Conclusion
By following these steps, you can set up Livebook to run as a systemd service for your user. This setup ensures that Livebook starts automatically when you log in and runs smoothly in the background. Enjoy your interactive notebooks with the convenience of a managed service! | dkuku |
1,906,390 | This is not a button | Check out this Pen I made! | 0 | 2024-06-30T07:29:21 | https://dev.to/tim_tom_13d2d04a6b587c4a3/this-is-not-a-button-51p0 | codepen, ai | Check out this Pen I made!
{% codepen https://codepen.io/tim-tom-the-flexboxer/pen/JjqQLYO %} | tim_tom_13d2d04a6b587c4a3 |
1,906,389 | This is not a button | Check out this Pen I made! | 0 | 2024-06-30T07:29:20 | https://dev.to/tim_tom_13d2d04a6b587c4a3/this-is-not-a-button-b70 | codepen, ai | Check out this Pen I made!
{% codepen https://codepen.io/tim-tom-the-flexboxer/pen/JjqQLYO %} | tim_tom_13d2d04a6b587c4a3 |
1,906,388 | Assignment_Two | A post by Mugisha Thomas | 0 | 2024-06-30T07:27:54 | https://dev.to/mugisha_thomas_9b97be8af6/assignmenttwo-2i41 | mugisha_thomas_9b97be8af6 | ||
1,906,387 | Setting Up Android Studio on Linux | Android development on Linux is straightforward and provides a powerful platform for app creation.... | 0 | 2024-06-30T07:24:10 | https://dev.to/sahilverma_dev/setting-up-android-studio-on-linux-4nga | linux, android, appdev | Android development on Linux is straightforward and provides a powerful platform for app creation. This guide will walk you through installing Android Studio, Java Development Kit (JDK), and setting up necessary environment variables.
## 1. Installing Android Studio
Android Studio is the official Integrated Development Environment (IDE) for Android app development. Here's how to install it on Linux:
a) Update your package lists:
```bash
sudo apt update
```
b) Install required dependencies:
```bash
sudo apt install default-jdk libc6:i386 libncurses5:i386 libstdc++6:i386 lib32z1 libbz2-1.0:i386
```
c) Download Android Studio:
```bash
wget https://redirector.gvt1.com/edgedl/android/studio/ide-zips/2023.1.1.26/android-studio-2023.1.1.26-linux.tar.gz
```
d) Extract the downloaded archive:
```bash
sudo tar -xvzf android-studio-*.tar.gz -C /opt/
```
e) Create a desktop entry for easy access:
```bash
echo "[Desktop Entry]
Version=1.0
Type=Application
Name=Android Studio
Exec="/opt/android-studio/bin/studio.sh" %f
Icon=/opt/android-studio/bin/studio.svg
Categories=Development;IDE;
Terminal=false
StartupNotify=true
StartupWMClass=android-studio" | sudo tee /usr/share/applications/android-studio.desktop
```
f) Make the desktop entry executable:
```bash
sudo chmod +x /usr/share/applications/android-studio.desktop
```
g) Launch Android Studio:
```bash
/opt/android-studio/bin/studio.sh
```
## 2. Installing Java Development Kit (JDK)
JDK is a crucial component for Android development. Here's how to install it:
a) Update package lists:
```bash
sudo apt update
```
b) Install default JDK:
```bash
sudo apt install default-jdk
```
c) Verify the installation:
```bash
java -version
javac -version
```
## 3. Setting Environment Variables
Setting ANDROID_HOME and JAVA_HOME is important for smooth Android development:
a) Find your Java installation path:
```bash
update-alternatives --display java
```
b) Edit your .bashrc file:
```bash
nano ~/.bashrc # with nano
code ~/.bashrc # with vs code
```
c) Add these lines at the end of the file:
```bash
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 # Check for installed version
export PATH=$PATH:$JAVA_HOME/bin
export ANDROID_HOME=/opt/android-studio/sdk
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
```
d) Save and close the file.
e) Apply the changes:
```bash
source ~/.bashrc
```
f) Verify the settings:
```bash
echo $JAVA_HOME
echo $ANDROID_HOME
```
With these steps completed, you'll have a fully functional Android development environment on your Linux system. Remember to keep your tools updated and explore the vast world of Android app development!
| sahilverma_dev |
1,906,381 | FullStack React Native Bootcamp | This course will not follow any regular way of teaching. Instead, it's like a hop-on-hop-off tourist... | 0 | 2024-06-30T07:12:15 | https://dev.to/subraatakumar/fullstack-react-native-bootcamp-1nb6 | reactnative, typescript, learning, javascript | This course will not follow any regular way of teaching. Instead, it's like a hop-on-hop-off tourist bus, stopping at important places where you should spend some time. I will explain these topics to you like a tourist guide, highlighting the key points and ensuring you get the most out of each stop.
With this approach, you can learn at your own pace. If a topic seems difficult, you can stay at that "stop" longer, just like you would at a favorite landmark. This flexibility means you won't feel rushed, and you can make sure you really understand each part before moving on. It's all about enjoying the learning journey and taking the time you need to grasp each concept fully.
Each stop represents a key part of React Native and Expo development. By breaking the course into these manageable segments, you can enjoy and appreciate each concept individually. This method helps you remember and apply what you've learned, giving you the confidence to build great applications. Whether you're just starting out or looking to deepen your knowledge, this course structure will make your learning experience both enjoyable and effective.
visit https://enhanceme.in and fill out the form available on the home page. You will receive the course enrollment link.
> Keep learning and Enhance your self step by step
.
| subraatakumar |
1,906,382 | Broken digits | Weekly Challenge 275 Each week Mohammad S. Anwar sends out The Weekly Challenge, a chance... | 0 | 2024-06-30T07:09:53 | https://dev.to/simongreennet/broken-digits-e7k | ## Weekly Challenge 275
Each week Mohammad S. Anwar sends out [The Weekly Challenge](https://theweeklychallenge.org/), a chance for all of us to come up with solutions to two weekly tasks. My solutions are written in Python first, and then converted to Perl. It's a great way for us all to practice some coding.
[Challenge](https://theweeklychallenge.org/blog/perl-weekly-challenge-275/), [My solutions](https://github.com/manwar/perlweeklychallenge-club/tree/master/challenge-275/sgreen)
## Task 1: Broken Keys
### Task
You are given a sentence, `$sentence` and list of broken keys `@keys`.
Write a script to find out how many words can be typed fully.
### My solution
Two relativity straight forward tasks this week. For this task, I split the `str` variable into the `words` list (array in Perl), converting the string to lower case. I also convert the `keys` list to lower case too. I have a variable `count` that is original set to zero. This is the number of words that don't contain a broken key.
```python
def broken_keys(s: str, keys: list) -> int:
words = s.lower().split(' ')
keys = [key.lower() for key in keys]
count = 0
```
I then loop through each `words` value as the variable `word`. If none (not any) of the letters in `keys` is in `word`, I add one to the `count` variable.
```python
for word in words:
if not any(key in word for key in keys):
count += 1
return count
```
### Examples
```bash
$ ./ch-1.py "Perl Weekly Challenge" l a
0
$ ./ch-1.py "Perl and Raku" a
1
$ ./ch-1.py "Well done Team PWC" l o
2
$ ./ch-1.py "The joys of polyglottism" T
2
```
## Task 2: Replace Digits
### Task
You are given an alphanumeric string, `$str`, where each character is either a letter or a digit.
Write a script to replace each digit in the given string with the value of the previous letter plus (digit) places.
### My solution
There are two unanswered questions that the examples don't shed a light on.
1. What happens when a number appears before the first letter? I treat this as an error, and exit the program with an appropriate message.
1. What is the output of `z1`? If this occurs, I roll over the alphabet. For example `z1` is `a`, `y3` is `b`.
I start with the following variables:
* `current_letter` which is the last seen letter (default is `None`)
* `solution` which represents the solution. It starts as an empty string.
* `alphabet` is a string of the 26 letters of the alphabet.
I loop through each letter of the `str` value, as the variable `char`. If it is a number, I calculate the index of the last letter, add `char` (as an integer) to it, and add the corresponding letter of the alphabet to the `solution` string. If it is a letter, I add it to the `solution` string and update `current_letter`.
```python
def replace_digits(s: str) -> str:
current_letter = None
solution = ''
alphabet = string.ascii_lowercase
for char in s:
if char.isdigit():
if current_letter is None:
raise ValueError('The first number must follow a letter.')
solution += alphabet[(alphabet.index(current_letter) +
int(char)) % 26]
else:
solution += char
current_letter = char
return solution
```
### Examples
```bash
$ ./ch-2.py a1c1e1
abcdef
$ ./ch-2.py a1b2c3d4
abbdcfdh
$ ./ch-2.py b2b
bdb
$ ./ch-2.py a16z
abgz
```
| simongreennet | |
1,904,263 | My Wins of Week 🌟 | Hi Awesome People on Internet!👋 I'm JK 🧑💻, & Hers my Wins of the Weeeeeeeeeeeek! ... | 27,912 | 2024-06-30T07:06:54 | https://dev.to/developedbyjk/my-wins-of-week-4him | weeklyretro |
## `Hi Awesome People on Internet!👋`
I'm **JK** 🧑💻, & Hers my Wins of the Weeeeeeeeeeeek!
#🎢
This week has been full of exciting developments, and I'm thrilled to share my progress with you.
---
⭐ _I Completed 9 Days Journey to #100daysofcode Challenge_
<br/>
<br/>
⚛️_I Reached 39% in React Course Revesion_
<br/>
<br/>
🎥 **_Created Video Introduction for Updated Vesion MoodyWorld App_**
>_MoodyWorld is a simple app where you can share your moods with the world!🌍_
<br/>
{% embed https://www.youtube.com/watch?v=ejdEtUxMREc %}
🔗 Try now: [MoodyWorld](https://moodyworld.netlify.app/)
`💡 Planning for creating more video of my Projects `
---
<br/>
💻 _Desktop version of MoodyWorld App_
<br/><br/><br/>
---
💾 _Project that i work on this week_
- [moodyworld ](https://moodyworld.netlify.app/)😜
- [awwwesome ](https://awwwesome.netlify.app/)🌟
- [helpfulwebsites](https://helpfulwebsites.netlify.app/) 👋
<br/>
🧠_Learning this week_
- Firebase Authentication and Storage
- use half image of logo if you want to set half logo at side
- React make JS & HTML so easy
`name = dev.to it will come in <h1> {name} </h1>`
- Sending Props in react
- Conditional Rendering in React
- Sending Data from `data.js` to main file
---
✍️ _Life Learningsss_
- Planning is so so so so so IMP!
- Surrounding Matter for focus working
- No Phone in Morning
<br/>
🎯 _Next Week Goals_
- Proper Planning and organizing of time & energy ⚡
- Working more on Project & Share Learnings 🧩
- Star Working on Node JS
<br/>
<center>
Thank you for reading about my journey this week! If you have any suggestions or feedback, please leave a comment below. Let's keep building and learning together!
</center>
<center>
Happy Weekend ❤️
</center>
| developedbyjk |
1,906,379 | Get Wil | This is a submission for the Wix Studio Challenge . What I Built A Dynamic and... | 0 | 2024-06-30T07:01:40 | https://dev.to/wilsonjuma254/get-wil-48l2 | devchallenge, wixstudiochallenge, webdev, javascript | *This is a submission for the [Wix Studio Challenge ](https://dev.to/challenges/wix).*
## What I Built
<!-- Share an overview about your project. -->
A Dynamic and Interactive E-Commerce Application.
## Demo
<!-- Share a link to your Wix Studio app and include some screenshots here. -->
Link: https://wilcrat.wixsite.com/get-wil
Or Click [Here](https://wilcrat.wixsite.com/get-wil)
## Development Journey
<!-- Tell us how you leveraged Wix Studio’s JavaScript development capabilities-->
<!-- Which APIs and Libraries did you utilize? -->
<!-- Team Submissions: Please pick one member to publish the submission and credit teammates by listing their DEV usernames directly in the body of the post. -->
<!-- Don't forget to add a cover image (if you want). --> | wilsonjuma254 |
1,906,377 | Difference Between Javascript and TypeSript | ** JavaScript ** Dynamic Typing: JavaScript is a dynamically typed language, meaning that... | 0 | 2024-06-30T06:45:03 | https://dev.to/darshan_kumar_c9883cffc18/difference-between-javascript-and-typesript-4cka | **
## JavaScript
**
Dynamic Typing: JavaScript is a dynamically typed language, meaning that variables can hold any value, and types are checked at runtime.
**Flexibility:** The flexibility of JavaScript allows for rapid development and prototyping.
**Compatibility:** JavaScript is natively supported by all web browsers and is the standard language for web development.
**Ecosystem:** JavaScript has a vast ecosystem with numerous libraries and frameworks like React, Angular, and Vue.js.
**Popularity:** JavaScript is one of the most widely used programming languages in the world.
**
## TypeScript
**
**Static Typing:** TypeScript is a statically typed superset of JavaScript, meaning that it introduces type checking at compile time. This can help catch errors early in the development process.
**Type Annotations:** Developers can explicitly define types for variables, function parameters, and return values, making the code more readable and maintainable.
**Tooling:** TypeScript’s type system enables better tooling support, such as autocompletion, navigation, and refactoring in IDEs.
**Compile Step:** TypeScript code must be transpiled to JavaScript before running in a browser or Node.js environment.
**Adoption:** TypeScript is increasingly adopted in larger projects and by companies that value maintainable and scalable codebases.
**
## Summary
**
JavaScript is more flexible and doesn’t require type annotations, making it suitable for quick prototyping and smaller projects.
TypeScript adds a layer of static typing and type safety, which can improve code quality and maintainability, especially in larger projects.
In essence, TypeScript offers all the features of JavaScript but with additional capabilities that help write safer and more predictable code. | darshan_kumar_c9883cffc18 | |
1,906,374 | 8 mistakes that noob product managers make. Tips from a productperson who has been through it all | Product managers have the power to determine whether a project will take off or go broke. Below, one... | 0 | 2024-06-30T06:40:25 | https://dev.to/ispmanager/8-mistakes-that-noob-product-managers-make-tips-from-a-productperson-who-has-been-through-it-all-44no | learning, career, startup, product | Product managers have the power to determine whether a project will take off or go broke. Below, one from ispmanager discusses the most common mistakes that novice product managers tend to make in both startups and well-established projects and how to avoid them.
## Four mistakes product managers make in startups
Startups have to develop their products from scratch, starting with determining who the product is for, why, how much it will cost, and how to market it. It may all seem clear cut, but in “the fog of war," problems can arise.
Here are some of the most common ones.
**Don't put together too rigid a profile of the target audience.** The key question for any salesperson is "For whom are we doing all this?" However, any understanding of who needs the product and who the end users will be can only be preliminary. Otherwise, development will be a bit like shooting clay pigeons in the dark: fun and interesting, but generating no profit for the company.
**How to avoid this:** Talk to people. Conduct interviews, interact in communities, and ask in forums—wherever potential customers frequent. The more we communicate, the more we learn about the character and motivations of the potential buyers.
**Not defining what makes a product better than its competitors.** When there are many successful analogs to your product on the market, it is harder to stand out. You can’t just hope that if something works for others, it will work for you.
**How to avoid this:**
- Pick a product feature and answer the question, "Why should a user choose your product and how is it better than the competition?"
- Ideally, you should have a clear idea of why customers should leave your competitors for you.
**Not measuring results at all or not doing so systematically.** Both beginners and experienced salespeople make this mistake.
For example, the team decides to test the hypothesis that users click the red button more often than the green one. Great idea: now we start counting and get rid of the less-clicked one. The test showed that 20 people clicked the red button and 10,000 people clicked the green one. So we removed the red one. But then profit crashed, and we’ve wasted all our resources for nothing.
> I looked at our backlog, we're wasting all our time. We need to stop and start doing things that make money.
**How to avoid this:** ask yourself and your team "Why are we doing this?" constantly until you find an answer that leads to real profit. The answer is the guiding star that your project needs to find direction.
**Not estimating market volumes.** At the beginning of their careers, salespeople rarely think about market volumes. It usually goes like this: we take on a task shouting "woo-hoo!" and dive right in, sure that someone out there will buy it.
**How to avoid this:** objectively assess the size of the market.
Red flags:
- Your product has no competitors. You might think: "Let's launch a unique business without any competitors to worry about.” However, it turns out that no one needs it, especially if you find that no one is even looking for it on the Internet.
- There were no previous analogs or projects that tried to launch but failed.
- The problem your product solves doesn’t show up in any web search.
It's one huge neon red flag if all three of the above are true. Your project is almost sure to fail.
> **Tips for a startup salesperson on how to avoid making the mistakes from this chapter**
> - Build a profile of the target market: talk to people to check whether they experience the problem that the product solves.
> - Analyze the competition—in what ways do customers solve the problem?
> - Identify how your product is better than the competition.
## Four mistakes product managers make with mature products
When a product is mature, all the problems with the target market profile have usually been ironed out and the differences from the competition have been identified. A mature product already has a product-market fit: a value for consumers. Therefore, in contrast to startups, salespeople in such projects have a different way of working and, therefore, different kinds of mistakes.
Here are some of the mistakes novice salespeople often make in companies offering a mature product.
**They choose the wrong direction for product development.** And yes, this is the most difficult decision.
**How to avoid this:** delve deeper into the metrics, like we do at ispmanager:
- Take a high-level business metric, such as conversion from the trial version to a paid license.
- Compare options on how to impact the metric.
- Hypothesize.
- Choose the most promising hypothesis and test it.
**Confusing the method with the actual goal.** Imagine your customer comes in and says that you urgently need to make a feedback form for customers on your site and app, with dozens of lines and complex filters. The team may have to drop everything and throw everything at the task. It may take huge amounts of time and effort, but it’s best to do whatever management wants.
The job of a sales manager is to constantly ask the question: "For what?" We need to understand what the task is, and most importantly, why we are doing it.
**How to avoid this:** have a conversation. After discussing with the customer, it may turn out that they just need to understand better how users react to blog articles. Then, it could be enough to put two buttons on the site: like and dislike.
So, we identified the real problem, proposed the best solution, and implemented it. We also saved a lot of the team's time and energy.
**Severely trimmed-down MVPs.** A common mistake is to release an MVP in a heavily trimmed-down version. It usually goes like this: we keep one feature out of seven, an MVP, and decide to add the rest later. As a result, the functionality is so limited that the users have no more need for the product.
**How to avoid this:** launch MVPs with a minimal set of features, but ones that solve a certain problem for the users. Then, there will be a better chance that they will find great value in the product.
**Do not measure how much value the product has for users.** Perhaps the financial indicators for the product are excellent, for example, good sales and LTV. But if you measure customer satisfaction, it may turn out that everything is not so great. They may be using the product, but already leaning towards the competition for various reasons. You won’t notice this immediately: business metrics will not immediately show that the product has stopped benefiting its users.
**How to avoid this:** in addition to business metrics, measure the value of the product for users.
> **Tips for a product manager managing a mature product on how not to make the mistakes listed in this chapter**
> - Determine the direction in which to develop the product by using business metrics, find how you can influence the metrics, make hypotheses, and test them.
> - Separate the method in which the problem is solved from the end goal. Sometimes, the customer wants something but actually needs something else.
> - Avoid downsizing the MVP to such a state that it is unusable.
> - Evaluate the actual benefit of the product for the users.
## Take-home message: tips for the aspiring product manager
Determine:
- The feature that will set the product apart from the competition.
- Who you are launching the product for. Try not to try to "sit on two chairs," meeting the needs of different target markets with one product.
- Always ask yourself: "What is this for?", "How will this affect the bottom line?". Always measure the results, over as little as a month, a year, or 10 years.
- Use business metrics to identify the right direction for product development.
- Competitors and market size: beware, if there are no competitors in the market and people don't have a problem that your product solves then they probably don't need it.
Do everything you can to make users fall in love with, and get addicted to, your product.
Want more articles like this? Subscribe to [our newsletter](https://9ce5ba7f.sibforms.com/serve/MUIFADo9TWiTfGbIQS2_6jvU1if3z-K6845WSmXxJOUoLHCEFzrofp-PTPVqQiNhh2Di3xDLMXG-lVfMoRRPkDt64Z_DwSm2yQPIkQVACt--A3R7My3LQnbONtZ7W4W6uaj0ramr9JLDJ3reMAmf7z-lS16D4qAfrlYcD5GUhGNfqfIi0YKkqO5niM7X6TRjUBll72vLzapyY_by) | ispmanager_com |
1,906,040 | Difference between normal links & tag links in Next.js | Today in this blog we will talk about the effect of using "a" tag & "Link" tag in Next.js. Are... | 0 | 2024-06-30T06:33:20 | https://dev.to/parsafarahani84/difference-between-normal-links-tag-links-in-nextjs-8m7 | webdev, javascript, react, programming | Today in this blog we will talk about the effect of using "a" tag & "Link" tag in Next.js. Are they really different from each other?
Sure they are, let me explain.
## Normal Links
When you use normal links like this:
```
<a href="./users">Click Here</a>
```
every time that you click the link and navigate to other pages, you call a request to all the files and all of them will download again. That's something we don't want of course. so look at this folder structure that I have to understand better:
In this structure, as you can see in my app folder I have a page.tsx file and a folder named "folder" that contains F1.tsx.
In the page file, I have below code that is just a simple page:
```
import React from "react";
async function page() {
return (
<div className="p-[1rem]">
<h1>Hello World</h1>
</div>
);
}
export default page;
```
And in the F1 file, I have this code that as you see it's just a simple button with "a" tag in it:
```
import Link from "next/link";
import React from "react";
function F1() {
return (
<button className="py-[0.5rem] px-[2.5rem] bg-gray-800 rounded-[0.75rem]">
<a href="/users" className="text-white">
click
</a>
</button>
);
}
export default F1;
```
When you click that "a" tag you will navigate to the user's file page and everything should work fine. But let's open the Network tab real quick.
It's normal, right? we have all the necessary files in here.
OK now clear the Network log and click the button to navigate to the user page:
By clicking the button we go to "http://localhost:3000/users" & this is our Network log:
As I told you we redownloaded all the unnecessary files again. and we don't want that. So what is the solution?
## Tag Links
Simple, we are just going to use "Link" instead of "a" tag. Like this:
```
import Link from "next/link";
import React from "react";
function F1() {
return (
<button className="py-[0.5rem] px-[2.5rem] bg-gray-800 rounded-[0.75rem]">
<Link href="/users" className="text-white">
click
</Link>
</button>
);
}
export default F1;
```
Now again open the Network tab, we have our files downloaded once. Click clear log like before and navigate to the F1 file using the button. Now if you see the log we just downloaded our necessary files and not all of the files again.
So to wrap up by using the "a" tag we download all the files again & again but with the "Link" tag we just download all the files once and on every page we just download what we need.
This small change may not seem handy but in the big projects, it will help you build a website or app with better performance and of course a faster one!
If this blog helped you please like and also feel free to share ANY opinion in the comments section. Thanks for reading🙏.
| parsafarahani84 |
1,906,373 | Trying DevOps things | Hello Everyone, As I continue my journey in the realm of DevOps, I've delved deeply into the... | 0 | 2024-06-30T06:32:00 | https://dev.to/dgtak/trying-devops-things-k6n | Hello Everyone,
As I continue my journey in the realm of DevOps, I've delved deeply into the intricacies of Linux administration and the vast potential of cloud computing. Every day brings a new challenge, from optimizing cloud infrastructures to automating deployment pipelines. The principles of continuous integration and continuous deployment (CI/CD) have become second nature, and mastering tools like Docker, Kubernetes, and Jenkins has been incredibly rewarding. This hands-on experience not only sharpens my technical skills but also reinforces the importance of collaboration and efficiency in delivering top-notch software solutions. | dgtak | |
1,906,372 | The Ultimate Guide to Laravel: A PHP Framework for Modern Web Applications | Introduction Laravel has revolutionized the PHP development landscape, becoming one of the... | 0 | 2024-06-30T06:27:38 | https://dev.to/arafatweb/the-ultimate-guide-to-laravel-a-php-framework-for-modern-web-applications-2c3g | webdev, laravel, php, beginners |
### Introduction
Laravel has revolutionized the PHP development landscape, becoming one of the most popular frameworks for developing modern web applications. Known for its rich syntax, powerful tools, and extensive community support, Laravel provides developers with a solid foundation for building scalable, maintainable, high-performing applications In this guide, we explore what what makes Laravel unique, its key features, and how you can start using this powerful framework.
### Table of Contents
1. What is Laravel?
2. Key Features of Laravel
1. Elegant Syntax
2. Artisan Console
3. Eloquent ORM
4. Blade Templating Engine
5. Middleware
6. Queue and Task Scheduling
7. Testing and Debugging
3. Getting Started with Laravel
1. Installing Laravel
2. Setting Up a New Project
3. Directory Structure
4. Building Your First Application
1. Creating Routes
2. Building Controllers
3. Working with Views
4. Using Eloquent ORM for Database Interaction
5. Advanced Laravel Features
1. Middleware for Request Filtering
2. Task Scheduling with Laravel Scheduler
3. Real-time Broadcasting with Laravel Echo
6. Best Practices for Laravel Development
1. Code Organization
2. Security Considerations
3. Performance Optimization
4. Deployment Strategies
7. Conclusion
8. FAQs
### 1. What is Laravel?
Laravel is an open-source PHP framework designed to make web development tasks more straightforward and efficient. It follows the Model-View-Controller (MVC) architectural pattern and is known for its expressive, elegant syntax. Laravel aims to ease the development process by simplifying common tasks such as routing, authentication, sessions, and caching.
### 2. Key Features of Laravel
#### Elegant Syntax
Laravel's syntax is designed to be clean and readable, making it easier for developers to write and understand code. This focus on simplicity helps reduce development time and minimize errors.
#### Artisan Console
Artisan is Laravel's command-line interface, providing a set of helpful commands for common tasks like database migrations, seeding, and generating boilerplate code. This tool boosts productivity by automating repetitive tasks.
#### Eloquent ORM
Eloquent is Laravel's Object-Relational Mapping (ORM) system, enabling developers to interact with databases using an intuitive, object-oriented syntax. Eloquent simplifies database operations and supports relationships, making it easier to manage complex data structures.
#### Blade Templating Engine
Blade is Laravel's powerful templating engine, allowing developers to create dynamic, reusable views. Blade templates are compiled into plain PHP code, ensuring fast performance without sacrificing flexibility.
#### Middleware
Middleware in Laravel provides a convenient mechanism for filtering HTTP requests entering your application. It's an essential feature for tasks like authentication, logging, and CORS handling.
#### Queue and Task Scheduling
Laravel's queue system allows you to defer time-consuming tasks, such as sending emails, for later processing. This helps keep your application responsive. The built-in task scheduler enables you to automate repetitive tasks with ease.
#### Testing and Debugging
Laravel comes with robust testing tools, including PHPUnit support and easy-to-use testing methods. These tools ensure your application runs smoothly and help catch bugs before they reach production.
### 3. Getting Started with Laravel
#### Installing Laravel
To install Laravel, you'll need Composer, a PHP dependency manager. Once Composer is installed, you can create a new Laravel project with the following command:
```bash
composer create-project --prefer-dist laravel/laravel myproject
```
#### Setting Up a New Project
After installation, navigate to your project directory and start the development server:
```bash
cd myproject
php artisan serve
```
Your Laravel application will be accessible at `http://localhost:8000`.
#### Directory Structure
Understanding Laravel's directory structure is crucial for efficient development. Key directories include:
- **app/**: Contains the core code of your application.
- **config/**: Stores configuration files.
- **database/**: Houses database migrations, seeders, and factories.
- **resources/**: Contains views, language files, and assets.
### 4. Building Your First Application
#### Creating Routes
Routes define how your application responds to HTTP requests. In Laravel, routes are defined in the `routes/web.php` file:
```php
Route::get('/', function () {
return view('welcome');
});
```
#### Building Controllers
Controllers handle the logic for your routes. Create a new controller using Artisan:
```bash
php artisan make:controller MyController
```
Define actions within your controller to manage requests.
#### Working with Views
Views are stored in the `resources/views` directory. Use Blade to create dynamic templates:
```blade
<!-- resources/views/welcome.blade.php -->
<!DOCTYPE html>
<html>
<head>
<title>Welcome to Laravel</title>
</head>
<body>
<h1>{{ $title }}</h1>
</body>
</html>
```
#### Using Eloquent ORM for Database Interaction
Eloquent makes it easy to interact with your database. Define a model and its corresponding table:
```bash
php artisan make:model Post
```
Perform database operations using Eloquent's intuitive syntax:
```php
$posts = App\Models\Post::all();
```
### 5. Advanced Laravel Features
#### Middleware for Request Filtering
Middleware can be used to filter HTTP requests. For example, you can create a middleware for authentication:
```bash
php artisan make:middleware Authenticate
```
Register the middleware in `app/Http/Kernel.php`.
#### Task Scheduling with Laravel Scheduler
Automate tasks using Laravel's scheduler. Define scheduled tasks in the `app/Console/Kernel.php` file:
```php
protected function schedule(Schedule $schedule)
{
$schedule->command('inspire')->hourly();
}
```
#### Real-time Broadcasting with Laravel Echo
Laravel Echo makes it easy to build real-time applications. Integrate Echo with WebSockets to broadcast events in real time:
```javascript
import Echo from "laravel-echo"
window.Echo = new Echo({
broadcaster: 'pusher',
key: 'your-pusher-key'
});
```
### 6. Best Practices for Laravel Development
#### Code Organization
Maintain a clean and organized codebase by following Laravel's conventions and best practices. Group related files, use meaningful names, and adhere to the MVC pattern.
#### Security Considerations
Ensure your application is secure by using Laravel's built-in security features, such as encryption, CSRF protection, and input validation.
#### Performance Optimization
Optimize your Laravel application for performance by caching queries, using optimized database indexes, and leveraging Laravel's built-in tools like Eloquent ORM and query builder.
#### Deployment Strategies
Deploy your Laravel application efficiently using services like Laravel Forge or Envoyer. Ensure your environment is configured correctly for production, with proper caching, database connections, and security settings.
### Conclusion
Laravel is a powerful and versatile PHP framework that simplifies web application development. With its elegant syntax, robust features, and extensive community support, Laravel provides everything you need to build high-quality applications. Whether you're a beginner or an experienced developer, Laravel's comprehensive ecosystem offers tools and resources to enhance your development process.
### FAQs
**Q1: What are the system requirements for Laravel?**
A1: Laravel requires PHP 7.3 or higher, Composer, and a web server like Apache or Nginx.
**Q2: Can I use Laravel for large-scale applications?**
A2: Yes, Laravel is designed to handle applications of all sizes, from small projects to enterprise-level applications.
**Q3: Is Laravel suitable for RESTful APIs?**
A3: Absolutely. Laravel provides robust support for building RESTful APIs, including features like routing, middleware, and Eloquent ORM.
**Q4: How can I contribute to Laravel?**
A4: You can contribute to Laravel by participating in its community, submitting pull requests, and sharing your knowledge through tutorials and blog posts.
**Q5: Where can I find Laravel documentation and resources?**
A5: The official Laravel documentation is available at [laravel.com](https://laravel.com/docs), and there are numerous tutorials, forums, and courses available online. | arafatweb |
1,906,367 | AWS: Your Ally in Amplifying Reliability with GenAI | Generative AI, or the Large Language Models, is by far one of the most exciting technologies we have... | 0 | 2024-06-30T06:21:23 | https://dev.to/aws-builders/aws-your-ally-in-amplifying-reliability-with-genai-41of | sre, genai, aws, awsbedrock | Generative AI, or the Large Language Models, is by far one of the most exciting technologies we have seen. It has far-reaching consequences, impacting various fields. Site Reliability Engineering is currently experiencing its moment, with GenAI revolutionizing operations. I refer to this as SRE 2.0, a new and improved version of SRE powered by GenAI.
**What really is an LLM?**
Before delving deeper, let's examine LLMs. A Large Language Model (LLM) is a type of artificial intelligence model developed to process and generate human-like text at scale. These models are trained on vast amounts of text data and can perform various natural language processing tasks. LLMs are built using deep learning techniques and have significantly advanced the capabilities of AI in understanding and generating human language.
**What can LLMs do?**
Well, as humans, we can input various types of data to LLMs, and they can perform operations on that data and provide outputs.
Typical inputs we can provide to LLMs include:
- Natural language
- Structured data
- Multilingual text
- Transcriptions
- Computer code
Typical operations LLMs can perform are:
- Text or code generation
- Text completion
- Text classification
- Text summarization
- Text translation
- Sentiment analysis
- Text correction
- Text manipulation
- Named entity recognition
- Question answering
- Style translation
- Format translation
- Simple analytics
Finally, the outputs LLMs provide include:
- Natural language text
- Structured data
- Multilingual text
- Computer code
**Site Reliability Engineering**
The mission of Site Reliability Engineering (SRE) is to ensure the reliability, availability, and performance of large-scale, distributed software systems. SRE teams typically work to create and maintain systems that are highly scalable, fault-tolerant, and resilient to failures, while also focusing on automating operations tasks and improving overall system efficiency. Ultimately, the goal of SRE is to minimize downtime, maximize system reliability, and enhance the user experience for customers.
SRE encompasses seven pillars:
- Observability
- SLI, SLO, and Error Budgets
- System Architecture and Recovery Objectives
- Release & Incident Engineering
- Automation
- Resilience Engineering
- Blameless Culture
As part of this exercise to identify GenAI use cases for SRE, let's deep dive into use cases for each area.
• **GenAI in Observability**
The mission of observability in SRE is to provide insights into system behavior, enabling proactive identification and resolution of issues to ensure reliability and performance. let's look at how we can amplify this by leveraging GenAI in SRE.
• **GenAI in SLI, SLO, and Error Budgets**
The mission of SLI, SLO, and Error Budgets in SRE is to establish and maintain measurable service level objectives, allowing teams to effectively manage and balance reliability and innovation. let's look at how we can amplify this by leveraging GenAI in SRE.
• **GenAI in System Architecture and Recovery Objectives**
The mission of System Architecture and Recovery Objectives in SRE is to design resilient systems and establish efficient recovery mechanisms to minimize downtime and ensure service reliability. let's look at how we can amplify this by leveraging GenAI in SRE.
• **GenAI in Release & Incident Engineering**
The mission of Release & Incident Engineering in SRE is to facilitate the safe and efficient deployment of software changes while promptly responding to and resolving incidents to maintain system reliability.let's look at how we can amplify this by leveraging GenAI in SRE.
• **GenAI in Automation**
The mission of Automation in SRE is to streamline operational tasks, enhance efficiency, and minimize human error by leveraging automated processes and tools.let's look at how we can amplify this by leveraging GenAI in SRE.
• GenAI in Resilience Engineering
The mission of Resilience Engineering in SRE is to build systems capable of withstanding and recovering from failures, ensuring uninterrupted service delivery in the face of disruptions. let's look at how we can amplify this by leveraging GenAI in SRE.
• **GenAI in Blameless culture**
The mission of Blameless culture in SRE is to foster an environment where individuals focus on learning from incidents and improving systems rather than assigning blame, promoting collaboration and innovation. let's look at how we can amplify this by leveraging GenAI in SRE.
**AWS GenAI Offerings:**
AWS offers three ways you can implement the above use cases in AWS:
- **Amazon PartyRock**: Explore AI-generated app development within the Amazon Bedrock playground, powered by Amazon.
- **Amazon Bedrock**: Access fully managed services from Amazon, enabling API calls to utilize models hosted on AWS.
- **Amazon SageMaker**: Host your machine learning models independently, leveraging the capabilities of Amazon.
**When to use PartyRock vs Bedrock vs SageMaker:**
Use Amazon PartyRock for simple use cases primarily based on text inputs and some degree of images. It's a shareable generative AI app building playground that you can use to create apps and share with your teams.
Choose Amazon Bedrock for more complex use cases and integrating multiple data sources. Bedrock provides the ability to access various LLMs via APIs, enabling the implementation of SRE use cases without worrying about managing complex LLMs.
Opt for SageMaker when you require full control of LLMs. Develop, host, and maintain your LLMs independently if you need complete control over LLMs.
**Best Practices to Follow When Using AWS to Implement Your SRE GenAI Use Cases:**
- **Select the Right LLM**: AWS offers multiple LLMs, so it's essential to research your requirements and choose the best one for your work, whether you're using PartyRock or Bedrock.
- **Be Mindful of Prompt Engineering**: Prompt engineering is crucial when working with LLMs or developing anything integrated with LLMs. Ensure prompt properties are checked for accuracy.
- **Provide Up-to-Date Information or Context (RAG/Knowledge Base)**: LLMs are trained on large volumes of data but may not always be up to date. Align your solution with current objectives by leveraging capabilities such as RAG or knowledge bases to provide more context.
- **Leverage Agents**: Agents are excellent tools to split tasks into multiple sub-tasks and let LLMs solve them. Agents can work with RAG or pull dynamic runtime information to equip your solution with real-time data.
- **LLM Observability**: Enable full-stack observability into your GenAI solution to proactively determine its performance and identify drifts.
**Additional Best Practices:**
- **Clear Objectives**: Define specific goals for each use case to guide the generative AI process effectively.
- **Continuous Evaluation**: Regularly assess the quality and effectiveness of generated outputs and refine the models based on feedback.
- **Ethical Considerations**: Consider ethical implications in the use of generative AI, ensuring outputs are fair, unbiased, and respect privacy.
- **Collaborative Approach**: Involve domain experts and end-users in the generative AI process to incorporate diverse perspectives and improve outcomes.
- **Iterative Improvement**: Continuously iterate on the generative AI models based on insights gained from real-world implementation and user feedback to enhance performance and reliability.
- **Avoid Static Models**: Treat generative AI models as dynamic solutions, regularly updating and refining them to adapt to evolving requirements and environments.
| indika_wimalasuriya |
1,906,370 | How SHELL-GPT Revolutionized My Workflow | Hey everyone, I just had to share my excitement about this incredible tool called SHELL-GPT. As a... | 0 | 2024-06-30T06:13:36 | https://dev.to/karleeov/how-shell-gpt-revolutionized-my-workflow-4o88 | shellgpt, sgpt, ai, terminal | Hey everyone, I just had to share my excitement about this incredible tool called SHELL-GPT. As a casual blogger and tech enthusiast, I'm always on the lookout for ways to streamline my work and make my life easier. Well, let me tell you, SHELL-GPT has been an absolute game-changer!
First off, for those of you who aren't familiar with SHELL-GPT, it's like having a super-smart AI assistant right in your terminal. You can ask it questions, get it to explain complex concepts, and even have it write code snippets for you. It's like having a geeky best friend who's always ready to help out.
Now, I know some of you might be thinking, "But Karl, I'm not a hardcore Linux user. Is this really for me?" Trust me, if I can get it up and running, anyone can! I'm using Arch Linux, and the setup process was a breeze. Here's a quick guide to get you started:
Open up your terminal and run:
```
sudo pacman -S python-pipx
```
This command installs pipx, which is a handy tool for installing and managing Python applications.
Once pipx is installed, simply run:
```
pipx install shell-gpt
```
This command will install SHELL-GPT and all its dependencies in an isolated environment.
Now, you might run into a small hiccup where running the sgpt command gives you a "command not found" error. Don't worry, it's an easy fix! Just run:
```
pipx ensurepath
```
This command automatically adds the directory where pipx installs binaries to your PATH.
If you're using zsh like me and prefer to manually add the directory to your PATH, open up your .zshrc file with:
```
nano ~/.zshrc
```
Then, add the following line at the end of the file:
```
export PATH="$HOME/.local/bin:$PATH"
```
Save the file by pressing Ctrl+X, then Y, and finally Enter.
To apply the changes, reload your zsh configuration by running:
source ~/.zshrc
And that's it! You're ready to start using SHELL-GPT. Give it a test drive by running something like:
sgpt "What is the Fibonacci sequence?"
Since I've started using SHELL-GPT, my productivity has skyrocketed. I can quickly get answers to my coding questions, generate helpful code snippets, and even have it proofread my blog posts for clarity and grammar. It's like having a secret weapon in my arsenal.
So, if you're looking to supercharge your workflow and have a bit of fun along the way, give SHELL-GPT a try. Trust me, you won't regret it! Happy coding, everyone! | karleeov |
1,906,368 | Exploring the Cool Refreshment of Strawberry Ice – RAZ TN9000 Disposable Vape | With the rapid evolution of vaping technology, enthusiasts are continually seeking new flavors and... | 0 | 2024-06-30T05:59:00 | https://dev.to/john7535/exploring-the-cool-refreshment-of-strawberry-ice-raz-tn9000-disposable-vape-1bjm | raz, vape | With the rapid evolution of vaping technology, enthusiasts are continually seeking new flavors and experiences. Among the latest innovations, the Strawberry Ice flavor in the RAZ TN9000 Disposable Vape has captured the attention of vape aficionados worldwide. Combining the nostalgic sweetness of ripe strawberries with a refreshing icy exhale, this [disposable vape](https://razzofficialsite.com/product/strawberry-ice-raz-tn9000-disposable-vape/) offers a sensory journey unlike any other.
The Flavor Journey
Imagine biting into a succulent, sun-ripened strawberry on a hot summer day. That initial burst of sweetness is impeccably captured in the Strawberry Ice flavor of the RAZ TN9000. However, what sets it apart is its cool twist – a hint of menthol that gently envelopes the palate on the exhale. This subtle icy sensation not only enhances the flavor profile but also provides a satisfyingly smooth finish that lingers delicately.
Convenience and Simplicity
One of the standout features of the RAZ TN9000 Disposable Vape is its convenience. Designed for those who appreciate simplicity without compromising on quality, this device requires no maintenance or refilling. Simply unbox, inhale, and enjoy. Its sleek, ergonomic design fits comfortably in hand, making it perfect for on-the-go vaping.
Performance and Reliability
Beyond its delectable flavor, the RAZ TN9000 excels in performance and reliability. Powered by a high-capacity battery, it ensures a consistent vaping experience throughout its lifespan. Each draw delivers a smooth vapor production, thanks to its advanced airflow system that minimizes resistance.
The Future of Vaping
As vaping continues to evolve, innovations like the RAZ TN9000 Disposable Vape are paving the way for a future where flavor, convenience, and satisfaction converge. Whether you're a seasoned vaper or exploring this world for the first time, the Strawberry Ice flavor offers a delightful introduction to the possibilities of disposable vaping devices.
Conclusion
In conclusion, the RAZ TN9000 Disposable Vape in Strawberry Ice flavor is not just a device; it's a gateway to a sensory experience. From its vibrant flavor profile to its effortless usability, every aspect is crafted to enhance your vaping journey. Whether you're unwinding after a long day or simply savoring a moment of tranquility, the Strawberry Ice flavor promises a cool, refreshing escape with every puff.
Experience the bliss of Strawberry Ice – RAZ TN9000 Disposable Vape today and discover why it's a must-have for vape enthusiasts seeking quality, flavor, and simplicity in one remarkable device.
| john7535 |
1,906,365 | PHP in the Age of AI: Don't Overlook This Web Powerhouse for Your Next Smart Project | Thereafter, PHP might very well prove to be the unsung hero of the AI revolution. While Python gets... | 0 | 2024-06-30T05:35:16 | https://dev.to/kareem-khaled/php-in-the-age-of-ai-dont-overlook-this-web-powerhouse-for-your-next-smart-project-1hie | ai, php, webdev, softwareengineering | Thereafter, PHP might very well prove to be the unsung hero of the AI revolution. While Python gets huge exposure, PHP's varied strengths make it compelling for many AI-fueled web applications. But let me make something clear: This is not about declaring PHP as "the best" for AI. It's a reminder, especially to software engineers: Compare and contrast choices based on the merits of each project, not dismiss PHP when it involves tapping its potential in the AI space.
## Why PHP & AI? A Practical Perspective
This is the real deal. Here's why you should just integrate artificial intelligence right into your current PHP stack. It's potentially going to be huge for the following reason.
**Leverage Your Existing Expertise**: If your team is already fluent in PHP, adding AI features doesn't mean you'll need to start from scratch. You can leverage your current experience and codebase to save hours and resources.
**Seamless Integration**: PHP is at the core of web development; it will, hence, easily integrate with your web servers, databases, and front-end technologies. This makes it easier to create a unified end-to-end AI-powered solution.
Performance & Scalability: While Python is a preeminent language for research, putting forward a great prototyping, PHP turns out more appropriate in production—especially where performance and scalability are concerns. The mature ecosystem of PHP provides tools and libraries to be leveraged for high-traffic web applications.
## Case Study: PHP-Powered AI in Production
Consider a large e-commerce website, in the region of millions of users or products. Suppose the company wants to implement a product recommendation system to boost their sales. Here is why they opted for PHP over Python:
**Already Existing Infrastructure**: The website was written already in PHP and the development team was deep in terms of knowledge regarding the language, thereby mandating an expensive and time-consuming port to Python.
Performance Requirements: The recommendations engine was to scale a huge amount of data in real-time. PHP, combined with optimized algorithms and caching strategies, could be tuned for the required performance at scale.
Integration with Other Systems: The recommendation engine should be seamlessly implemented into the existing website systems, which were PHP-based catalog, shopping cart, and user profile. This was way easier with a PHP-based solution.
The team trained a machine learning model using the Rubix ML library, which then passively analyzed user behavior and product data to make personalized product recommendations for inclusion in the PHP codebase. Long story short—the result was a huge increase in sales and customer engagement.
## Choosing the Right Tool for the Job
This case study demonstrates one very important thing: **there is no single answer when developing artificial intelligence**. Although Python has an exceptionally high support in research and data science, only now, with PHP, would it be possible to prove that it is indeed an equally powerful choice in AI's integration into web applications.
Consider these factors in the choice of language for your AI project:
* Inherited code and competence of your team—build on top of what you already have.
Performance and scalability—pick a language that will hold the weight of your workload.
System Integration—Your AI pieces should communicate seamlessly with other parts of your application.
Easy Deployment and Maintenance—Consider the long-term costs and complexities.
### Your AI Journey with PHP Starts Here
Now, it becomes the duty of every software engineer to embrace the best tools for every job. There is nothing wrong with experimenting and looking into the possibilities with AI using PHP. After all, you never know what you might achieve.
## Let's Keep the Conversation Going!
I look forward to getting your feedback on this. Have you ever tried using PHP for AI projects? What are your experiences and insights? Share your stories in the comments below or connect with me on [kareem_khaled@t-horizons.com](mailto:kareem_khaled@t-horizons.com/). Let us build a more illuminated, intelligent future together with PHP and AI!
| kareem-khaled |
1,906,517 | Malicious Software Removal Tool (MRT) in Windows 11? | How to use this tool in Windows 11? MSRT is not a replacement for a full antivirus... | 0 | 2024-07-01T05:33:30 | https://winsides.com/malicious-software-removal-tool-in-windows-11/ | beginners, devops, windows, tips | ---
title: Malicious Software Removal Tool (MRT) in Windows 11?
published: true
date: 2024-06-30 05:28:46 UTC
tags: beginners, devops, windows, tips
canonical_url: https://winsides.com/malicious-software-removal-tool-in-windows-11/
cover_image: https://winsides.com/wp-content/uploads/2024/06/Malicious-Software-Removal-Tool-in-Windows-11.webp
---
## How to use this tool in Windows 11?
MSRT is not a replacement for a **full antivirus program**. It only targets specific, prevalent malware and does not provide comprehensive protection. It is included in the **automatic updates** provided by Windows Update. It runs in the background and does not require user intervention. However, users can also use it manually using the following steps.
- Open Run Command using <kbd>Win Key</kbd> + <kbd>R</kbd>. Run the following command. `mrt`
_Run MRT in Run Command_
- Malicious Software Removal Tool will open now.
_Welcome to MRT Tool_
- Click **Next** to continue with the process.
- There will be three options, **Quick Scan** , **Full Scan** , and **Custom Scan**. Choose your option accordingly. For explanation, I am proceeding with Quick Scan.
_Quick Scan with MRT_
- The Tool will start the scan.
_MRT Scanning the Computer_
- The scanning process will take some time. Once it is completed, the scan will provide the results.
- Click **View Detailed Results of the Scan** to check the results.
_View Detailed Results of the Scan_
- Detailed results will be displayed. If everything is clean, then you will find “Not Infected”. Click OK to close the window.
_Detailed Results_
- Finally, click **Finish** to close the **Malicious Software Removal Tool in Windows 11**. That is it!
_Finish_
Microsoft quotes “This tool is not a replacement for an anti-virus product. To help protect your computer, you should use an anti-virus product”. | vigneshwaran_vijayakumar |
1,906,364 | Introducing Material UI: Exploring 5+ MUI Dashboard Templates | Material UI is a design system based on Google’s Material Design language, introduced in 2014, and... | 0 | 2024-06-30T05:22:55 | https://themewagon.com/blog/material-ui-with-5-mui-templates/ | webdev, opensource, mui, frontend | Material UI is a design system based on Google’s Material Design language, introduced in 2014, and works with various JavaScript frameworks apart from React, such as Angular.js, Next.js, and Vue.js. Material UI, later rebranded as MUI, is a design system that helps ensure consistent visual language throughout your websites and web apps. Necessarily, MUI dashboard templates are a collection of fully built, out-of-the-box React components for your application that have been developed to ensure quality. They provide many pre-designed built-in UIs, designed following Google’s guidelines and principles to build components.
We’ll try to explore the basic and advanced features of MUI briefly with the 5 most popular MUI dashboard templates. These pre-built MUI website templates help maintain a consistent visual language throughout your website or application with a modern and user-friendly look, simultaneously ensuring flawless response and intuitive user interaction across pages.
Let’s get into the details!
## A Short Glimpse at Material UI##
Material UI, an open-source framework, was introduced in 2014 to empower React developers with more engaging and fascinating user interfaces. It was developed implementing [Google’s Material Design Guidelines](https://m3.material.io/). To reduce confusion regarding the brand identity, the framework was rebranded into MUI, which is shorter, familiar, resembles the organization’s focus, and works properly.
MUI is not directly linked to material design. It is more than material UI and covers a broader area. Material is the foundation or base of MUI. MUI’s component architecture and API design prioritize React-specific patterns and best practices, following this Material Design by Google. MUI also integrates a different design philosophy that evolves around new web technologies and trends, ensuring compatibility with modern React practices and optimizing performance for real-world applications. MUI templates make it easy for developers, designers, and clients to achieve this.
##Basic Features of MUI Website Templates##
MUI was introduced to enhance the user interface(UI) to empower React developers, but later, the focus shifted to intensify the design and developer experience (DX). Additionally, MUI templates made it more accessible to the mass community so that they could utilize its useful features. Some of the basic features that MUI templates offer are:
- **Component Library:** The MUI system provides a set of CSS utilities with prebuilt components and unique feature lists. It also offers a set of flexible generic wrapper components, like Box or Container, that let you design directly without wasting much time in coding.
- **Theming & Customization:** MUI templates offer powerful theming capabilities and customization options to reflect your brand. With the versatile customization of the pre-built components, MUI allows you to create a custom theme. By defining a custom theme and using it consistently across your application, you can also reduce redundancy and optimize the CSS output in the bundle.
- **Accessibility:** MUI templates are ARIA-compliant with their pre-built and ready-to-use components, which include an out-of-the-box keyboard. The components allow users to navigate in a simple but easy way, so developers can effortlessly make the site accessible to more people.
- **Design System:** The root or foundation of the MUI template is the Material Design system created by Google. MUI empowered React developers to build effective Material Design, implementing Google’s Material Design guidelines to build customer-facing applications, internal tools, and mobile-hybrid apps. But now, it is responsible for a whole suite of products they can design themselves. The in-house styling solutions allow designers to create a design, maintain its consistency with the codebase, and make the website flawless.
##Advanced Features of MUI Website Templates##
MUI was introduced to match the growing necessities of the Material UI Design community, but now it offers far beyond that. It offers an advanced set of tools that provides fast delivery of new features. Let’s get into the details:
1. **Responsiveness:** MUI templates use grids that make layout creation flexible and straightforward, and enable the creation of complex layouts with ease. On the other hand, it integrates form APIs like React Hook Form, validation libraries such as ZOD, Formik, Yup, many authentication functions, typescripts, etc. that help to collaborate designers with backend developers without barriers and provide an extensive developer experience.
2. **Server-Side Rendering (SSR):** Server-side rendering (SSR) of Material UI involves rendering Material UI components on the server side before sending the HTML to the client. It offers many benefits, such as improved performance, SEO optimization, and better initial loading times for users, etc. MUI templates integrate well with Server-Side Rendering (SSR) frameworks. For example, Next.js for React, Nuxt.js for Vue.js, Angular Universal for Angular, etc. This framework support of MUI helps to implement material UI components on the server naturally, maintaining flexibility and complexity.
3. **Integration:** MUI works with other JavaScript frameworks such as – Angular.js, Next.js, jQuery, Vite.js, and Vue.js, enabling developers to leverage its components and styling capabilities across different tech stacks. Some key aspects of advanced integration are:
- **Styling**: MUI uses a CSS-in-JS approach (via JSS – JavaScript Style Sheets) for styling, which offers scoped styles and dynamic theming capabilities. It also uses the **<ThemeProvider> **component to apply custom themes across your entire application or specific parts.
- **Interaction**: MUI utilizes advanced routing techniques with frameworks like React Router or Next.js for seamless navigation within your Material UI application. Furthermore, MUI offers a responsive grid system (**<Grid>** Component) for complex layouts that adapt to different screen sizes.
- **Internationalization:** MUI supports internationalization and localization through libraries like **<@mui/material/locale>** and integration with i18n libraries such as react-intl or i18next.
4.**Ecosystem & Extensions:** MUI was introduced to match the growing necessities of the Material UI Design community, but now it offers far beyond that. They offer an advanced set of tools that quickly ship new features. The service is divided into 2 product lines. They are MUI Core, the foundational Material Design, and MUI X, which offers advanced components such as data grids, date and time pickers, tree view, charts, etc. These components feature advanced functionality for data-rich applications and other use cases. Moreover, MUI X works seamlessly with MUI Core and extends the functionality of its UIs while standing on their own.
5.**Performance:** MUI templates offer intuitive performance by reducing bundle size. The strategies MUI applies are:
- **Tree-shaking:** Tree-shaking is one of the significant strategies for reducing bundle size. MUI uses ES6 module syntax that is compatible with tree shaking and allows unused code to be eliminated during the bundling process. But, for that, the bundle should support tree shaking.
- **Component Importing:** MUI imports only the components needed for a particular design rather than the entire library, which reduces bundle size by excluding unused components. A sample code is given below:
`import Button from '@mui/material/Button';
import TextField from '@mui/material/TextField';`
In addition, using a bundle analyzer, optimizing production builds, and compressing JavaScript and CSS files effectively reduces the bundle size in MUI and enhances performance.
**Check Out Our Latest Free MUI Dashboard Templates Here:**
- **[Motiv.](https://themewagon.com/themes/motiv/)**, designed by [Rushit Dhameliya](https://www.figma.com/@rushituiux) for the Figma Design Community, is a [free MUI dashboard template](https://themewagon.com/theme-price/free/) built using the Material UI framework.
- **[Dashdark X](https://themewagon.com/themes/dashdarkx/)**, designed by [Malik Ali](https://www.figma.com/@malik_ali) for the Figma Design Community, is an admin dashboard template built using the Material-UI framework.
- **[Modernize](https://themewagon.com/themes/modernize-mui/)** is an [admin dashboard template](https://themewagon.com/theme-category/admin-dashboard/) designed by [Seju](https://www.figma.com/@sejal_ui_ux) for the Figma Design Community. It is built using the Material-UI framework.
- **[Elegent](https://themewagon.com/themes/elegent/)** is an admin dashboard template designed by [Malik Ali](https://www.figma.com/@malik_ali) for the Figma Design Community. It is built using the Material-UI framework by ThemeWagon.
##Ideal Usages of MUI Website Templates##
MUI provides a massive UI component library for open-source projects. Let’s dive into the versatile usability and contributions to efficient UI design and development provided by MUI:
###Enterprise Applications###
Enterprise applications require complex and scalable UIs and custom styling and theming to match the corporate branding. MUI offers a highly customizable and easy-to-integrate component library. Its modular and scalable architecture supports the development of complex UIs for large-scale applications and provides layout utilities, error handling, validation support, etc. These theming styles and consistent design approaches make it well-suited for enterprise applications.
###eCommerce Platforms###
MUI has an exclusive ability to boost engagement and empower users, which is highly beneficial for e-commerce platforms. Its grid, card, form validation libraries, and other components can be used to make an intuitive display of products, shopping carts, checkouts, product search, and order options. Moreover, MUI’s grid system ensures great responsiveness and a better website outlook regardless of screen size. Additionally, these interactive features ensure better product marketing.
###Prototyping and Design Consistency###
App prototyping is a crucial point and the first step before development. Sticking to a clear design plan is important to maintain consistency and a similar outlook in the prototype. One of the significant popularity of MUI is design consistency, which resonates well with prototyping tactics for the developer. Since MUI maintains a consistent design with standard elements throughout the web pages, it makes product updates and design changes simple while maintaining the same approach for developers.
##In-depth Look into 5+ Official MUI Dashboard Templates##
Let’s explore the features and functionalities of Material UI discussed above using the 5 most efficient and official MUI Dashboard Templates:
###[Minimal](https://mui.com/store/items/minimal-dashboard/)###
Minimal, client, and admin dashboard is a fully functional MUI template with 1000+ features. This is a premium MUI template powered by Material UI. The template has rich code quality, and the intuitive design ensures a sleek user experience with modern technical proficiency. It covers the following categories you may consider before implementing minimal to your project.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook Form |
|RTL & LTR Support |Clean & Complete Design||ZOD Form Validation Library|
| Different Layouts|Impressive Customization |ESLint JavaScript linting utility|
|5 Authentication systems| Continuous Upgrade| Prettier Integrated|
####Remarks####
Minimal effortlessly accomplishes the needs of developers and users. The meticulous design and intuitive features are made to streamline the workflow of any business. It will effortlessly accommodate your needs with intuitive features that simplify the workflow.
###[Devias Kit](https://mui.com/store/items/devias-kit-pro/)###
DeviasKit, client, and admin dashboard is another fully functional MUI template by Material UI. It is also a premium template with rich code quality. This is a professional Next.js and Vite.js template with 85 individual components, including a toaster, 5 authentication systems, animation, a text editor, and many more. This MUI template’s flexibility and feature availability help developers find the best one according to different requirements.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook API |
|RTL & LTR Support |Clean & Complete Design||ZOD Form|
| Different Layout Styles|Impressive Customization |React Context API|
|5 Authentication systems with 2 different styling| Rich Feature Availability| Framer Motion|
####Remarks####
DeviasKit has a very clean and organized codebase with great examples. It keeps updating design trends to Next.js and other libraries. Its easy customization seamlessly integrates with your business, so you can focus on your business coding.
###[Mantis](https://mui.com/store/items/mantis-react-admin-dashboard-template/)###
Mantis is another MUI dashboard template with continuous updates. The React Material UI template has great customizability and design quality. This is also a premium template with a rich code quality. This is a professional Next.js and Vite.js template with 80 individual component packages, 5 conceptual Apps like E-commerce, Chat, User Management, Social Profile and Calendar, and many more. The responsive template offers a retina-ready display regardless of screen size.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook API |
|RTL & LTR Support |Clean & Complete Design||React Router|
| Different Layout Styles|Impressive Customization |4 Authentication Systems|
|4 Authentication systems| Rich Feature Availability| SWR & React Context API|
####Remarks####
Mantis is easy for newbies to start, and the design looks very clean. It is a well-suited template for enterprise applications with great responsiveness. It is compatible with Chrome, Mozilla, Edge, Safari (macOS), and Opera browsers.
###[Berry](https://mui.com/store/items/berry-react-material-admin/)###
Berry is a beautiful React Admin Template with many ready-to-use blended Material UI components. The template helps you create your backend application even faster than before. The React v18 supported template is suitable for building the User Management app, Chat app, Customer-centric app, SaaS-based interface, and many more with high-performance code & fully responsive designs.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook Form |
|RTL & LTR Support |Clean & Complete Design||Form Validations|
| Different Layout Styles|Impressive Customization |Form Wizards|
|4 Authentication systems| Rich Feature Availability| 4 Authentication Methods|
####Remarks####
Berry is a page-speed-optimized template using Google Page Speed and GTMetrix tools. Additionally, it is compatible with browsers such as – Chrome, Mozilla, Edge, Safari (macOS), and Opera. The template effortlessly accomplishes the needs of developers and users.
###[Mira Pro](https://mui.com/store/items/mira-pro-react-material-admin-dashboard/)###
Mira Pro is another professional React Dashboard Template with plenty of ready-to-use Material UI components and features. The template has SaaS-based interfaces that provide the best outcome for E-Commerce and analytics application websites. Moreover, the clean codebase and extensive design quality help your team move faster and save on development costs.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook Form |
|RTL & LTR Support |Continuous Upgrade||ESLint JavaScript Linting Utility |
| Multilanguage Support|Impressive Customization |Prettier Integrated|
|4 Authentication systems| Rich Feature Availability| Formik & YUP validation |
####Remarks####
The quality of the Mira Pro template’s codebase is top-tier. End product quality is also top-tier. Documentation is quality.
##Honorary Mention##
In addition to the templates explored above, we have Uifort, a MUI dashboard template that’s popular among most MUI users. Hence, we’re adding it to the existing list of official store templates as an honorary mention.
###[Uifort](https://mui.com/store/items/uifort-react-admin-dashboard-template/)###
Uifort is a simple but exclusive React Dashboard template for the admin and client of your website. The intuitive design empowers developers and designers, simplifying their jobs. This professional template was built with modern technologies and tailored for Next.js and Vite.js.
| Features | Quality | Libraries |
| ------------- |:-------------:| -----:|
| Live Customization Enabled | Standard Codebase | React Hook Form |
|RTL & LTR Support |Continuous Upgrade||ZOD form validation |
| Multilanguage Support|Impressive Customization |Supabase Authentication|
####Remarks####
The template’s simple design offers great flexibility and easy customization. It is suitable for enterprise-level user interfaces.
##Pros & Cons of Using MUI Dashboard Templates##
As we can see, MUI offers many benefits, such as large community support, extensive documentation, theming, backend development support, and so on. But it also has some drawbacks. The benefits and drawbacks of using MUI are discussed below:
###Benefits of Using MUI Dashboard Template###
Many developers are switching to MUI because of the large component library. It also offers many proficiencies, such as:
- MUI templates ensure a consistent and polished outlook across the website.
- They offer plenty of pre-built components, saving development time and effort.
- Generally, MUI templates are built to be responsive out of the box.
- Material UI has a large community of developers, so getting community support with necessary resources, tutorials, and community-generated components to enhance your project is much easier.
- MUI offers cross-team collaboration that streamlines the workflow and boosts consistency between designers and developers.
- The codes are easier to maintain, and debugging is easier.
###Drawbacks of Using MUI Dashboard Template###
MUI provides a powerful component library for creating amazing user interfaces, although it may not facilitate all projects. Some factors to consider while working with MUI are as follows:
- Most of the MUI templates now have licensing restrictions. Before using them in commercial projects, you must check the licensing terms.
- MUI templates save time in customizing, but understanding effective customization and integrating them into your specific project may require some learning, especially for developers new to Material UI.
- Depending on the implementation, there could be performance implications, and customizations overloaded with unnecessary components or styles could impact loading times.
- MUI templates are often built with specific frameworks like React, Angular, etc. If you’re not using one of these frameworks, integration might require additional effort or
Trusted by thousands of organizations, MUI maintains a cohesive visual style and facilitates rapid prototyping and iteration. MUI templates save you time and money and make your brand look better. They are built to simplify your workflow and boost consistency between designers and developers.
By leveraging the aforementioned official MUI dashboard templates and customizing them according to your brand’s personality, you can create an extraordinary design for your branding that resonates with your audience.
Enjoy creating! | themewagon |
1,906,330 | function declarations vs function expressions in Javascript 🤔✌️ | When it comes to defining functions in JavaScript, there are two primary ways to do so: function... | 0 | 2024-06-30T05:22:13 | https://dev.to/rajusaha/function-declarations-vs-function-expressions-in-javascript-353l | webdev, javascript, beginners, tutorial | When it comes to defining functions in JavaScript, there are two primary ways to do so: function declarations and function expressions. While they may seem similar, there are key differences between them that can impact the behavior of your code. Let’s explore these differences in detail.
## Function Declaration
A function declaration is a standard way of defining a function using the function keyword, followed by the name of the function.
Characteristics of Function Declarations:
- **Named Functions**: They are declared with a specific name.
- **Not Assignable to Variables**: Function declarations stand alone and are not typically assigned to variables.
- **Hoisted**: Function declarations are hoisted, meaning they are available before any other code execution. You can call a function declared this way before its definition in the code.
```javascript
// Calling the function before its definition due to hoisting
Declaration();
function Declaration(){
console.log('function declaration is called');
}
// Calling the function after its definition
Declaration();
```
## Function Expression
A function expression involves defining a function as part of an expression. This usually means assigning a function to a variable.
Characteristics of Function Expressions:
- **Assigned to Variables**: Function expressions are typically assigned to a variable.
- **Not Hoisted**: Function expressions are not hoisted, meaning they can only be accessed after their definition.
- **Use Cases**: Function expressions are often used when you need to pass a function as an argument to another function or when you want to define functions conditionally.
```javascript
// Trying to call the function before its definition will result in an error
expression(); // Will give an error
// Defining the function as a function expression
const expression = function(){
console.log('function expression');
};
// Calling the function after its definition
expression();
```
## Key Differences
**Syntax and Structure:**
- Function Declaration:`function Declaration() { // code }`
- Function Expression: `const expression = function() { // code };`
**Hoisting**
- Function Declaration: Hoisted to the top of the scope.
- Function Expression: Not hoisted; must be defined before use.
**Naming:**
- Function Declaration: Named functions.
- Function Expression: Can be anonymous or named, but usually assigned to variables.
**Use Cases**
- Function Declaration: Best for defining standard, reusable functions.
- Function Expression: Useful for conditional definitions and passing functions as arguments.
| rajusaha |
1,906,332 | how to Learn Dijkstra's Algorithm? | Learning Dijkstra's algorithm, a fundamental algorithm in computer science for finding the shortest... | 0 | 2024-06-30T05:17:40 | https://dev.to/fridaymeng/how-to-learn-dijkstras-algorithm-17e3 |
Learning Dijkstra's algorithm, a fundamental algorithm in computer science for finding the shortest paths between nodes in a graph, involves understanding its theory, practical implementation, and applications. Here’s a structured guide to help you learn Dijkstra’s algorithm:
### 1. Understand the Basics of Graph Theory
Before diving into Dijkstra’s algorithm, ensure you understand basic graph theory concepts:
- **Graph**: A collection of nodes (vertices) and edges (links between nodes).
- **Weighted Graph**: A graph where each edge has a numerical value (weight) associated with it.
- **Directed and Undirected Graphs**: In a directed graph, edges have a direction, whereas in an undirected graph, they do not.
### 2. Learn the Theory Behind Dijkstra’s Algorithm
Dijkstra's algorithm finds the shortest path from a starting node to all other nodes in a weighted graph with non-negative weights.
#### Key Concepts
- **Shortest Path**: The path between two nodes that has the smallest total weight.
- **Priority Queue**: A data structure used to efficiently retrieve the node with the smallest tentative distance.
#### Steps of the Algorithm
1. **Initialization**:
- Set the distance to the source node to 0 and all other nodes to infinity.
- Mark all nodes as unvisited.
- Set the source node as the current node.
2. **Main Loop**:
- For the current node, consider all its unvisited neighbors and calculate their tentative distances through the current node.
- Update the shortest distance for each neighbor if the calculated distance is less than the known distance.
- After considering all neighbors, mark the current node as visited.
- Select the unvisited node with the smallest tentative distance as the new current node.
3. **Termination**:
- The algorithm terminates when all nodes have been visited or the smallest tentative distance among the unvisited nodes is infinity (no connection).
### 3. Study Pseudocode
Here’s the pseudocode for Dijkstra's algorithm:
```text
function Dijkstra(Graph, source):
dist[source] ← 0
for each vertex v in Graph:
if v ≠ source:
dist[v] ← ∞
add v to Q (priority queue)
while Q is not empty:
u ← vertex in Q with min dist[u]
remove u from Q
for each neighbor v of u:
alt ← dist[u] + length(u, v)
if alt < dist[v]:
dist[v] ← alt
decrease-key v in Q with alt
return dist
```
### 4. Implement Dijkstra’s Algorithm in Code
Try implementing the algorithm in a programming language of your choice. Here’s an example in Python:
```python
import heapq
def dijkstra(graph, start):
# Initialize distances and priority queue
distances = {vertex: float('infinity') for vertex in graph}
distances[start] = 0
priority_queue = [(0, start)]
while priority_queue:
current_distance, current_vertex = heapq.heappop(priority_queue)
# Nodes with smaller distances may have already been processed
if current_distance > distances[current_vertex]:
continue
for neighbor, weight in graph[current_vertex].items():
distance = current_distance + weight
# Only consider this new path if it's better
if distance < distances[neighbor]:
distances[neighbor] = distance
heapq.heappush(priority_queue, (distance, neighbor))
return distances
# Example usage
graph = {
'A': {'B': 1, 'C': 4},
'B': {'A': 1, 'C': 2, 'D': 5},
'C': {'A': 4, 'B': 2, 'D': 1},
'D': {'B': 5, 'C': 1}
}
print(dijkstra(graph, 'A'))
```
### 5. Visualize the Algorithm
Use visualization tools to see how Dijkstra’s algorithm works step by step. Websites like [VisuAlgo](https://addgraph.com/learnDijkstraAlgorithm) provide interactive demonstrations of the algorithm.
### 6. Solve Practice Problems
Apply your knowledge by solving problems on competitive programming sites like LeetCode, HackerRank, or CodeSignal. Look for problems tagged with "Dijkstra" or "shortest path."
### 7. Explore Advanced Topics
Once you have a solid understanding, explore related topics and variations:
- **A* Algorithm**: An extension of Dijkstra's algorithm with heuristics.
- **Bellman-Ford Algorithm**: Handles graphs with negative weights.
- **Floyd-Warshall Algorithm**: Finds shortest paths between all pairs of nodes.
### Resources for Further Learning
- **Books**: "Introduction to Algorithms" by Cormen et al. (commonly known as CLRS).
- **Online Courses**: Platforms like Coursera, edX, and Udacity offer courses in algorithms and data structures.
- **Tutorials**: Websites like GeeksforGeeks and Khan Academy provide excellent tutorials and explanations.
By following this structured approach, you’ll gain a comprehensive understanding of Dijkstra’s algorithm, from its theoretical foundations to practical implementation and applications. | fridaymeng | |
1,906,329 | DAY 6 PROJECT: POLL SYSTEM | Building a Poll System with HTML, CSS, and JavaScript This project is a simple,... | 0 | 2024-06-30T05:08:54 | https://dev.to/shrishti_srivastava_/day-6-project-poll-system-47n0 | webdev, javascript, beginners, programming | ## Building a Poll System with HTML, CSS, and JavaScript
This project is a simple, interactive poll system built using HTML, CSS, and JavaScript. It allows users to vote for their favourite programming language from options like JavaScript, Python, Java, and C++.
The results are dynamically displayed with visual bars, providing an engaging way to visualize preferences. This project is perfect for learning about web development fundamentals and how to create interactive user interfaces.
**Key Elements:**
- Radio Buttons: Each option for voting is a radio button, ensuring only one choice can be selected.
- Submit Button: Calls the submitVote() function to process the user's selection.
- Results Div: Displays the poll results dynamically.
### Benefits of the Poll System Project
1. **Interactive Learning**: Gain hands-on experience with HTML, CSS, and JavaScript.
2. **User Engagement**: Provides an engaging way for users to participate and see real-time results.
3. **Dynamic Updates**: Teaches how to manipulate the DOM and update content dynamically.
4. **Data Visualization**: Visual representation of data through percentage bars enhances understanding.
5. **Customization**: Easily customizable to include more options or different topics.
**Tools used**
**HTML**
The HTML code sets up a poll interface with radio buttons for selecting a favorite programming language, a submit button to cast votes, and a div to display results.
**CSS**
The CSS styles the poll system with a centered container, colorful labels, and animated elements, enhancing user interaction and visual appeal.
**JAVASCRIPT**
- Data Structure: An array of objects stores poll options and their vote counts.
- Vote Submission: submitVote() checks for a selected option, increments votes, and calls displayResult() to update the results.
- Dynamic Results: displayResult() calculates percentages and updates the results display with a progress bar for each option.
1. **Options Array**: Stores poll options, each with an ID, text, and vote count.
2. **submitVote Function**:
- Checks if a poll option is selected.
- Increments the vote count for the selected option.
- Calls `displayResult()` to update the poll results.
3. **displayResult Function**:
- Calculates the percentage of total votes for each option.
- Dynamically creates and displays result bars and percentages in the `#result` div.
4. **getTotalVotes Function**:
- Computes the total number of votes across all options.
5. **refreshPage Function**:
- Refreshes the page when called, effectively resetting the poll.
SO,
This poll system project provides an engaging way to learn and apply HTML, CSS, and JavaScript. It allows users to vote and see dynamic results, reinforcing concepts like DOM manipulation and data visualization. This foundational project can be easily customized and expanded, making it a great starting point for further web development exploration.
THANK YOU!
HAPPY CODING!
| shrishti_srivastava_ |
1,906,328 | From Zero to Hero: Building Your First Serverless Application with AWS Lambda | Serverless computing has revolutionized the way we develop and deploy applications. By abstracting... | 0 | 2024-06-30T05:00:10 | https://dev.to/raazketan/from-zero-to-hero-building-your-first-serverless-application-with-aws-lambda-5h2i | Serverless computing has revolutionized the way we develop and deploy applications. By abstracting away server management, serverless architectures allow developers to focus on writing code and solving problems without worrying about infrastructure. One of the most popular services for serverless applications is AWS Lambda. In this article, we will guide you through building your first serverless application using AWS Lambda, integrating it with API Gateway and S3.
## Understanding Serverless Architecture
Serverless architecture is a cloud computing execution model where the cloud provider dynamically manages the allocation and provisioning of servers. Key benefits include:
- **Cost Efficiency**: You pay only for the compute time you consume.
- **Scalability**: Serverless applications automatically scale with demand.
- **Reduced Operational Overhead**: No need to manage server infrastructure.
Compared to traditional server-based models, serverless offers a flexible and efficient way to build applications. Common use cases include web and mobile backends, data processing, and real-time file processing.
## Setting Up Your AWS Environment
Before diving into AWS Lambda, let's set up our AWS environment.
1. **Create an AWS Account**: Go to [AWS](https://aws.amazon.com/) and sign up for an account.
2. **Set Up IAM Roles**:
- Navigate to the IAM (Identity and Access Management) console.
- Create a new role with permissions for Lambda and S3.
3. **Familiarize with AWS Management Console**: Explore key services like Lambda, S3, and API Gateway.
## Creating Your First Lambda Function
Now, let’s create a simple Lambda function.
1. **Open the Lambda Console**:
- Navigate to the Lambda service in the AWS Management Console.
- Click "Create function."
2. **Configure Function Settings**:
- Choose "Author from scratch."
- Name your function (e.g., `HelloWorldFunction`).
- Select the runtime (e.g., Node.js, Python).
3. **Write the Function Code**:
- Use the inline code editor to write your function. Here’s a basic example in Python:
```python
def lambda_handler(event, context):
name = event.get('name', 'World')
return {
'statusCode': 200,
'body': f'Hello, {name}!'
}
```
4. **Deploy the Function**:
- Click "Deploy" to save and deploy your function.
## Integrating AWS Lambda with API Gateway
Next, we’ll create an API endpoint to trigger our Lambda function.
1. **Open the API Gateway Console**:
- Navigate to API Gateway in the AWS Management Console.
- Click "Create API" and choose "REST API."
2. **Create a Resource and Method**:
- Create a new resource (e.g., `/greet`).
- Add a GET method to the resource.
3. **Link the Method to Lambda**:
- Select "Lambda Function" as the integration type.
- Specify the region and function name (`HelloWorldFunction`).
4. **Deploy the API**:
- Create a new deployment stage (e.g., `prod`).
- Note the Invoke URL provided by API Gateway.
Using the provided URL, you can now invoke your Lambda function via HTTP requests.
## Storing Data with AWS S3
Let's enhance our Lambda function to interact with AWS S3.
1. **Create an S3 Bucket**:
- Open the S3 console and create a new bucket (e.g., `my-lambda-bucket`).
2. **Update Lambda Function to Read/Write S3**:
- Modify your Lambda function to upload and retrieve files from S3. Here’s an example in Python:
```python
import boto3
import json
s3 = boto3.client('s3')
BUCKET_NAME = 'my-lambda-bucket'
def lambda_handler(event, context):
key = event.get('key', 'default.txt')
content = event.get('content', 'Hello, World!')
# Upload file to S3
s3.put_object(Bucket=BUCKET_NAME, Key=key, Body=content)
# Retrieve file from S3
obj = s3.get_object(Bucket=BUCKET_NAME, Key=key)
data = obj['Body'].read().decode('utf-8')
return {
'statusCode': 200,
'body': json.dumps({'message': 'File processed', 'content': data})
}
```
3. **Test Your Function**:
- Deploy and test your function using the API Gateway URL, passing in appropriate parameters.
## Monitoring and Debugging Lambda Functions
Monitoring and debugging are crucial for maintaining serverless applications.
1. **Set Up CloudWatch Logs**:
- AWS CloudWatch automatically collects logs from Lambda functions.
- Access logs via the CloudWatch console for debugging and monitoring.
2. **Optimize Performance**:
- Use CloudWatch metrics to monitor function performance.
- Adjust memory and timeout settings in the Lambda console based on usage patterns.
## Conclusion
In this article, we’ve built a simple serverless application using AWS Lambda, integrated it with API Gateway, and used S3 for data storage. Serverless architecture allows for scalable, cost-efficient applications without the hassle of server management. Explore additional AWS services and experiment with more complex applications to further your learning.
Happy coding!
. | raazketan | |
1,906,325 | My 100 Days of Code Challenge Starts Now! | It all starts now! June 29, 2024 100 days of code #100DaysOfCode #100DOC Codecademy Full Stack... | 0 | 2024-06-30T04:47:37 | https://dev.to/jacobsternx/my-100-days-of-code-challenge-starts-now-4ai3 | 100daysofcode, beginners, webdev, javascript | It all starts now!
June 29, 2024
100 days of code
\#100DaysOfCode \#100DOC
* Codecademy Full Stack Engineer certificate
* FSE certificate is composed of 6 courses
* Each course is composed of ~8 Lessons and Projects
* Each course has 2 assessments
* My coding aim is to hustle and shine at least 4 hours per day
* Daily posts will include highlights, insights, and lessons learned
* Weekly posts will include a summary, showcase progress, and map a path forward
https://www.codecademy.com/learn/paths/full-stack-engineer-career-path
HTML+CSS, Git, JavaScript, Accessibility, Interactive Site Design, Web apps, Redux, Security, DevOps, eCommerce, PostgreSQL, Express, React, Node, PERN apps
Cross posted: Dev.to `https://dev.to/jacobsternx` and LinkedIn.com `https://www.linkedin.com/in/jacobsternx`
| jacobsternx |
1,906,326 | How to Scale an Existing Ruby on Rails Product from x to 10x | Scaling a Ruby on Rails product, especially one with a messy codebase, is a challenging yet rewarding... | 0 | 2024-06-30T04:32:00 | https://dev.to/praveenkumar/how-to-scale-an-existing-ruby-on-rails-product-from-x-to-10x-24j7 | rails, coderefactoring, scalability, webdev | Scaling a Ruby on Rails product, especially one with a messy codebase, is a challenging yet rewarding journey. The key lies in methodically refactoring your codebase, implementing best practices, and optimizing performance. Here’s a roadmap to guide you through this transformation.
### **1. Identify and Address Code Smells**
First, focus on the areas with the most significant performance issues and clean up code smells.
#### **Setup Tools for Code Cleanup**
- **Brakeman**: A tool to find security vulnerabilities in your Rails application.
- **Rubycritic**: A tool that generates a report of code quality, identifying code smells and complexity.
#### **Refactoring Plan**
- **Level 1 - Immediate Isolation**
- Create new services to isolate code.
- **Level 2 - Function-Level Isolation**
- Further clean up and isolate code at the function level.
- **Level 3 - Performance Enhancements**
- Benchmark performance, fix issues, ensure database constraints, and apply necessary locks.
### **Example Scenario: Refactoring a Module**
Let’s consider refactoring a module, such as handling charts in your application. The same principles apply to other modules.
### **Assumptions**
- The same APIs are being called in multiple places, leading to redundancy and potential failures.
- Many if-else conditions are used to handle different types within the same API, making the codebase hard to extend and maintain.
### **Problems with Current Code**
- Using the same API in multiple places increases the risk of overriding and unnecessary failures.
- Excessive if-else conditions make the codebase hard to extend and maintain.
- Fat services reduce developer confidence due to the high risk of introducing bugs with small changes.
### **Suggested Improvements**
- Write extendable and modular code.
- It’s okay to use meta-programming and create multiple smaller APIs.
- Prefer having more files over numerous conditions within a single file.
### **Why This Approach is Helpful**
- **Reduces Bugs**: Isolating code and reducing conditions helps in spotting and fixing issues quickly.
- **Improves Readability**: Clear, modular code is easier to understand and maintain.
- **Boosts Developer Confidence**: Developers can make changes without fearing widespread issues.
### **Implementation Steps**
1. **Create a Refactoring Plan**: Outline the areas needing immediate attention and plan the refactor in phases (Level 1, Level 2, Level 3).
2. **Isolate Services**: Begin by isolating services and functionality, breaking down large services into smaller, manageable pieces.
3. **Reduce Conditions**: Minimize the use of if-else conditions by creating separate APIs or services for different functionalities.
4. **Benchmark Performance**: Continuously measure performance to identify and address bottlenecks.
5. **Ensure Robustness**: Implement database constraints and locks where necessary to ensure data integrity and application stability.
### **Example Approach for Chart Handling**
In a typical scenario, handling chart data might involve multiple APIs with various conditions. Instead of adding layers of conditions, separate the APIs based on functionality and context. For example, if you need charts for different departments or company-wide metrics, create dedicated APIs for each use case.
### **Advantages of This Approach**
- **Extendability**: Easily add custom behavior for specific contexts without affecting others.
- **Readability**: Clear separation of concerns improves code readability.
- **Reduced Complexity**: Isolated changes make it easier to manage and test the code.
### **Organizing Serializers**
Organize serializers using namespaces to maintain clarity and structure. For example, group serializers by their functionality and context and ensure each serializer handles a specific part of the data transformation.
### **Namespace Advantages**
- **Clarity**: A clear hierarchy and structure help in understanding the codebase.
- **Maintainability**: Easier to manage and extend serializers without affecting other parts of the application.
### **Steps to Improve and Scale**
1. **Identify Code Smells and High-Impact Areas**: Use tools to find and prioritize areas that need attention.
2. **Restructure and Plan Refactoring**: Create a phased plan to address these issues incrementally.
3. **Partial Cleanup for Understandability**: Clean up code to make it more understandable before making significant changes.
4. **Benchmark and Optimize Performance**: Continuously measure and optimize performance.
### **Conclusion**
Scaling a messy Ruby on Rails product requires a focused and methodical approach. By isolating problematic areas, implementing coding conventions, and optimizing performance, you can transform your codebase into a scalable, maintainable system. Remember, it’s about taking incremental steps and continuously improving.
Ready to scale your Rails app? Start today, stay focused, and embrace the journey. Let’s build, learn, and grow together. Follow my journey [**here**](https://twitter.com/PraveenInPublic). | praveenkumar |
1,906,295 | 6 Useful Resources for Beginners in Front-End Development | Are you a beginner in front-end development? Then you are in the right place. In this post, I'll... | 27,911 | 2024-06-30T04:30:00 | https://rhythmusbyte.blogspot.com/2024/06/frontend-resources-part1.html | webdev, beginners, learning, frontend | Are you a beginner in front-end development? Then you are in the right place. In this post, I'll share some useful resources for aspiring front-end developers. I hope it will help you.
Before that, if you are not focusing on the front end and are focusing on something else, regardless of the programming language, you can always rely on [Google](https://www.google.com/) and [YouTube](https://www.youtube.com/) as your primary sources of help. Also, if you are stuck with something and need to seek help from other programmers, you can always rely on [StackOverflow](https://stackoverflow.com/). It is a paradise for programmers.
> You can read the full article from [here](https://rhythmusbyte.blogspot.com/2024/06/frontend-resources-part1.html)
---
### [W3Schools](https://www.w3schools.com)
First of all, this one is my fav in this list. It has almost everything about HTML, CSS, and JavaScript, along with other resources for you to become not just a front-end developer, but a Full-Stack Developer.
### [freeCodeCamp](https://www.freecodecamp.org/)
It is a non-profit organization that offers a comprehensive curriculum in web development. Personally, I used freeCodeCamp in my early days to learn HTML & CSS. They have an [Android](https://play.google.com/store/apps/details?id=org.freecodecamp) app as well as a [YouTube](https://youtube.com/@freecodecamp?si=D7srcxggAAj3Jrdu) channel. Check out their YouTube channel; you won’t regret it.
### [Udacity](https://udacity.com/)
Udacity has a bunch of cool free courses. And if you want something more organized, they've got paid nanodegree programs too!
---
Read the full article from [here](https://rhythmusbyte.blogspot.com/2024/06/frontend-resources-part1.html). | rhythmusbyte |
1,906,324 | Unleash Your AI Potential with this Go-Powered Neural Network Tutorial! 🤖 | Learn how to build a simple artificial neural network using the Go programming language, covering machine learning principles and practical implementation. | 27,801 | 2024-06-30T04:28:26 | https://getvm.io/tutorials/how-to-build-a-simple-artificial-neural-network-with-go | getvm, programming, freetutorial, technicaltutorials |
Hey there, fellow developers! 👋 Are you curious about the world of machine learning and artificial intelligence, but haven't quite figured out how to dive in? Well, I've got the perfect resource for you – a step-by-step guide on building a simple artificial neural network using the Go programming language!
## Highlights of this Incredible Tutorial:
- **Fundamental Concepts Covered**: This tutorial takes you on a deep dive into the core principles of artificial neural networks and machine learning, ensuring you have a solid foundation to build upon.
- **Practical Implementation in Go**: The best part? You'll be implementing a real, working neural network using the Go language. This means you'll get to see the theory in action and learn how to apply these concepts in a real-world programming environment.
- **Hands-on Approach**: Instead of just reading about neural networks, you'll be rolling up your sleeves and coding along. This hands-on approach will help you truly understand and retain the material, making you a machine learning pro in no time! 🧠
## Why You Should Check Out This Resource:
If you're a developer who's been itching to dive into the world of AI and machine learning, this tutorial is an absolute must-read. It's the perfect way to get your feet wet and start building real, functional neural networks using the powerful and versatile Go programming language.
So, what are you waiting for? Head over to the tutorial and get ready to [unleash your AI potential](https://sausheong.github.io/posts/how-to-build-a-simple-artificial-neural-network-with-go/)! 🚀 Trust me, your future self will thank you.
## Supercharge Your Learning with GetVM's Playground 🚀
But wait, there's more! To truly maximize your learning experience, I highly recommend using the [GetVM Playground](https://getvm.io/tutorials/how-to-build-a-simple-artificial-neural-network-with-go) alongside this tutorial. GetVM is a powerful Google Chrome browser extension that provides an online coding environment, allowing you to put the concepts you've learned into practice instantly.
With the GetVM Playground, you can dive right into coding your own artificial neural network in Go, without the hassle of setting up a local development environment. The Playground offers a seamless, browser-based experience, where you can experiment, test, and refine your code in real-time.
This hands-on approach is invaluable when learning complex topics like machine learning and artificial intelligence. By combining the theoretical knowledge from the tutorial with the practical application in the Playground, you'll solidify your understanding and accelerate your progress towards becoming a true AI master. 🧠
So, what are you waiting for? Grab the GetVM extension, head over to the Playground, and let's start building that neural network together! 💻 The future of AI is in your hands.
---
## Practice Now!
- 🔗 Visit [How to build a simple artificial neural network with Go](https://sausheong.github.io/posts/how-to-build-a-simple-artificial-neural-network-with-go/) original website
- 🚀 Practice [How to build a simple artificial neural network with Go](https://getvm.io/tutorials/how-to-build-a-simple-artificial-neural-network-with-go) on GetVM
- 📖 Explore More [Free Resources on GetVM](https://getvm.io/explore)
Join our [Discord](https://discord.gg/XxKAAFWVNu) or tweet us [@GetVM](https://x.com/getvmio) ! 😄 | getvm |
1,906,323 | Live Coding Clerk, into Next.js with James Perkins | Original: https://codingcat.dev/podcast/cwcc-0-9-clerk-with-appwrite Clerk React is a React... | 26,111 | 2024-06-30T04:23:24 | https://codingcat.dev/podcast/cwcc-0-9-clerk-with-appwrite | webdev, javascript, beginners, podcast |
Original: https://codingcat.dev/podcast/cwcc-0-9-clerk-with-appwrite
{% youtube https://youtu.be/4P_ax04-T4c %}
Clerk React is a React Hooks library that makes it easy to build CRUD applications. The library provides a set of high-level hooks that abstract away the details of managing state, fetching data, and handling errors.
Clerk React is designed to be easy to use, even for beginners. The hooks are well-documented and there are plenty of examples to help you get started.
In this blog post, we'll show you how to use Clerk React to build a simple todo app.
## Getting Started
The first step is to install Clerk React. You can do this with the following command:
```bash
npm install clerk-react
```
Once Clerk React is installed, you can start using the hooks in your app.
## Update _app.tsx
Include the below to wrap all components in a ClerkProvider.
```typescript
import '../styles/globals.css';
import type { AppProps } from 'next/app';
import { ClerkProvider, SignedIn, SignedOut, SignIn, UserButton } from '@clerk/nextjs';
function MyApp({ Component, pageProps }: AppProps) {
return (
<ClerkProvider {...pageProps}>
<Component {...pageProps} />
</ClerkProvider>
);
}
export default MyApp;
```
## Full Repo Example
<section class=" aspect-video"> <iframe title="stackblitz for firebase app check" src="https://stackblitz.com/github/CodingCatDev/clerk-demo?embed=1&file=README.md" frameborder="0" height="100%" width="100%" loading="lazy" /> </section>
[CodingCatDev/clerk-demo](https://github.com/CodingCatDev/clerk-demo) | codercatdev |
1,906,306 | The Devrel Digest June 2024: One Whole Year of the DevRel Digest | Happy first birthday to the DevRel Digest! One year ago, I decided to start writing the... | 25,904 | 2024-06-30T04:18:46 | https://dev.to/lizzzzz/the-devrel-digest-june-2024-one-whole-year-of-the-devrel-digest-57ag | devrel | ---
title: "The Devrel Digest June 2024: One Whole Year of the DevRel Digest"
published: true
series: The DevRel Digest
---
## Happy first birthday to the DevRel Digest!
One year ago, I decided to start writing the DevRel Digest. At that point, it had been only three months since I was laid off. It had been recommended to me to include regular content creation in my job search strategy and a roundup of the DevRel news, events, thoughts, and opinions I was already consuming seemed highly feasible and beneficial for the community. So I started writing.
A lot has happened in just one year, and despite all the ups and downs, I managed to publish a DevRel Digest each other. I feel accomplished and proud of myself! Thank you for being a part of this endeavor and holding space for its evolution.
Here’s a retrospective of the past twelve months and some thoughts for the future of the DevRel Digest.
## Gary has always been a part of the DevRel Digest
The very first DevRel Digest was a [LinkedIn article](https://www.linkedin.com/pulse/devrel-digest-june-2023-your-opinion-wanted-empathy-needed-liz-acosta/) crowned with a photo of the bestest boy ever – Gary.
<figcaption>Gary getting the Caravaggio treatment in the photo studio</figcaption>
While Gary’s role in the DevRel Digest has evolved, he has been there since day one. For those of you who are unfortunately unacquainted, Gary is a 14-year-old pug. Gary came into my life when I met my ex, along with an “adopted little sister” pug named Lily. Lily sadly passed away a couple of years ago when she developed cancer. I confess I was a little disappointed to be left with Gary – which was totally unfair of me because Gary is the sweetest little man. I’m glad I finally saw the light because the DevRel Digest wouldn’t be the same without Gary.
With the breakup, I am uncertain if I will get to see Gary again. Fortunately, I have plenty of photos, so Gary will continue to show up in the Digest!
## The early days on Medium
Initially, I planned on publishing to several platforms to maximize reach, but the return on investment was too low to justify the effort, so I switched to Medium. I switched to Medium because I had used the platform in its early days with some success and it seemed like the appropriate place for the Digest.
[From its inception to October 2023, the DevRel Digest lived on Medium](https://medium.com/the-devrel-digest). During that time, Developer Relations as a practice and as an organizational role was in the middle of emerging from some of the bitter realities of the tech industry in the face of COVID-19. Without conferences to speak and represent companies at, DevRel roles seemed suddenly superfluous and lots of people in the field lost their jobs or saw their teams downsized not just in size, but in budget.
DevRel has always struggled to prove its worth as a specialty in which impact can be hard to explicitly quantify, but after the start of the pandemic, it became even more urgent to establish [meaningful metrics](https://medium.com/the-devrel-digest/the-devrel-digest-august-2023-measuring-metrics-and-maturity-and-members-of-community-9f76596724b0). This necessitated a reassessment of the age-old question: [“What even is DevRel?”](https://medium.com/the-devrel-digest/the-devrel-digest-september-2023-developer-relations-and-the-abyss-48b649c5e056) These are the themes reflected in the early DevRel Digest and are worth revisiting as the field continues to recover.
The [August DevRel Digest](https://medium.com/the-devrel-digest/the-devrel-digest-august-2023-measuring-metrics-and-maturity-and-members-of-community-9f76596724b0) is when I began incorporating tarot – and poorly Photoshopping Gary into tarot cards. And that’s when the DevRel Digest really began to find its voice.
<figcaption>Gary making his tarot debut</figcaption>
## From Medium to Dev.to
I started using Medium before its current monetization structure. I liked it then, but now Medium feels a little more inaccessible than I would prefer. I was intrigued when I started to see content on Dev.to. The ability to write in Markdown feels appealingly developer first. Moreover, Dev.to’s audience seems more community-oriented and therefore more engaged – the perfect home for the DevRel Digest.
For a couple of months, I published to both Medium and Dev.to, and began [publishing exclusively to Dev.to in November](https://dev.to/lizzzzz/series/25904). I wish I could say it was a calculated decision derived from extensive data, but it was mostly “just vibes.” I had also written [the first of my series on testing strategies for Python](https://dev.to/lizzzzz/using-pythons-builtin-tools-for-unit-test-parameterization-a-closer-look-at-unittest-subtest-12ca) and preferred how Dev.to formats code snippets.
## DevRel you should know
As the holidays approached and organizations began planning for the next year, it was the perfect opportunity to highlight people in Developer Relations who exemplify the best of the community and the practice. [I asked for nominations](https://www.linkedin.com/feed/update/urn:li:activity:7131747336313081856/) and was delighted by the enthusiasm of the engagement I received. One of the reasons I don’t think I will ever leave DevRel is the people. They are supportive, collaborative, and inspiring, and I am honored to count myself among them.
I want to do this again this year, but this time I will begin the process earlier! I learned that the more people involved in an effort, the longer it will take. Now that I know people are receptive to the concept, I hope to refine the nomination system and maybe come up with more explicit selection criteria.
Now that we’re halfway done with the year, it is interesting to [reread everyone’s predictions](https://dev.to/lizzzzz/the-devrel-digest-november-2023-devrel-you-should-know-part-one-and-why-i-will-never-ever-leave-developer-relations-1elh) [for DevRel in 2024](https://dev.to/lizzzzz/the-devrel-digest-december-2023-devrel-you-should-know-part-two-and-reflections-on-2023-5fk5).
## The DevRel Digest now and tomorrow
I went into 2024 without a job and growing anxiety, so I hired a coach to help with the job search. The first thing she did was reassure me that I _am_ competent and experienced and that I _will_ find a job. The next thing she did was tell me to quit faking it through interviews and to just be myself because that was the only way I was going to find a team I could thrive with.
So I wrote [what kind of feels like a dating profile](https://www.linkedin.com/feed/update/urn:li:activity:7123061161150844928/), but for a job, and transmitted it out into the LinkedIn universe. And, to my surprise, I got a response. By Valentine’s Day, I had a job offer that has turned out to be life-changing in so many ways.
Layoffs are still happening in tech and it sucks, but it seems to have slowed down. Most of the people in my job search cohort are now employed, and while many people in DevRel are considering switching to less turbulent and more secure roles, Developer Relations isn’t going anywhere anytime soon. Developer Relations[ continue to evolve and mature](https://dev.to/lizzzzz/the-devrel-digest-february-2024-the-devrel-renaissance-24e3), [honing in on clearer goals and more precise strategies](https://dev.to/lizzzzz/the-devrel-digest-january-2024-devrel-and-dev-marketing-and-no-more-random-acts-of-content-14hb).
I am still learning how to make time for the DevRel Digest while working a full-time job. I am still figuring out what exactly the DevRel Digest is and I’ve started to collect data as well as try experiments like [writing a tutorial](https://dev.to/lizzzzz/mock-it-till-you-make-it-mocking-in-pythons-unittest-42d4) instead of the usual Digest. I have also been considering moving to a newsletter format and platform. I just moved into a new apartment, so it will probably be a while before I have the chance to make any decisions!
What I can say for certain is that I am committed to maintaining the DevRel Digest and I am excited to see what the rest of 2024 brings.
Here's to celebrating a second birthday next year!
<figcaption>Gary's got his party hat on!</figcaption>
## Events and resources and other notable things
* This is going to be a pretty sparse listing because tomorrow I am speaking at [North Bay Python](https://2024.northbaypython.org/)!!! And I need to go practice!
* The [11th Annual DevRel Survey](https://www.stateofdeveloperrelations.com/) is open from now until July 22nd. The State of DevRel Report is such an important resource and the report is only made possible by survey participants like you and me! Go fill it out!
* [DevRelCon](https://nyc24.devrelcon.dev/) is July 18th - 19th in New York. I won’t be attending in person, but if you can, you should check it out! | lizzzzz |
1,906,303 | How to Learn Any New Skill with Ease? | Ever felt that burning desire to create something but were stuck, unsure of where to start? I've been... | 0 | 2024-06-30T04:11:22 | https://dev.to/praveenkumar/how-to-learn-any-new-skill-with-ease-34al | learning, mvp, startup, skilldevelopment | Ever felt that burning desire to create something but were stuck, unsure of where to start? I've been there too, overwhelmed by the vastness of what I didn't know. Today, I'm sharing my journey from a place of curiosity to launching a product with 10,000 users. These lessons, learned over a decade ago, still hold true today.
### The Daunting Start
Starting a new skill isn't easy. The initial hurdles are many: staying consistent, sifting through a sea of resources, and finding the right tutorials and courses. It's easy to feel lost, especially at the beginning.
### The Power of Active Learning
In my quest for knowledge, I watched countless videos, sometimes even at 4x speed, trying to grasp the core ideas. But I realized something crucial: passive learning wasn't enough. Just watching or mimicking others' work wouldn't cut it. To really understand, I had to build, apply, and yes, make mistakes.
Think about it—you can't learn to swim by watching others or reading about it. At some point, you have to dive into the water.
### The Leap of Faith
With this realization, I took a bold step. I built my product and launched it, bugs and all. Why? Because launching was the only way to truly learn and grow. It was a hands-on approach that taught me the intricacies of creation and problem-solving.
### The Path to Mastery
Mastering a skill isn't just about passive consumption but active participation. It's about launching, gathering feedback, iterating, and refining. It's about accountability, consistency, and continuous growth. Here’s my approach:
1. **Dive in Headfirst**: Start by building what you want to learn.
2. **Launch Early**: It instills discipline and a sense of responsibility.
3. **Engage with Your Audience**: Their feedback is invaluable.
4. **Stay Accountable**: Make your plans public. It keeps you motivated.
5. **Celebrate Every Milestone**: No achievement is too small. Every step forward counts.
### Reflections from a Decade Ago
My journey began 10 years ago. Today, I build, scale, and innovate. It's not just about learning; it's about applying, iterating, and scaling. If I could do it a decade ago, standing at the crossroads of uncertainty, so can you.
### Join Me on This Adventure
If my story resonates with you or if you're looking for tips on learning new skills, building from scratch, scaling applications, or strategically refactoring existing ones, join me on this exciting adventure. Let’s learn, build, and grow together. Follow my journey here. | praveenkumar |
1,906,272 | Remove Duplicate Elements from JavaScript Array | Removing duplicate elements from a JavaScript array is a common task that developers often need to... | 0 | 2024-06-30T02:41:27 | https://dev.to/d8578raj/remove-duplicate-elements-from-javascript-array-3862 | Removing duplicate elements from a JavaScript array is a common task that developers often need to perform. [JavaScript](https://www.school247.org/javascript/) offers several methods to achieve this, each suitable for different scenarios.
## 1. Remove Duplicates Using the `Set` Object
The `Set` object lets you store unique values of any type, whether primitive values or object references. Converting an array to a `Set` removes all duplicate elements.
**Example:**
```javascript
let numbers = [1, 2, 2, 3, 4, 4, 5];
let uniqueNumbers = [...new Set(numbers)];
// Output: [1, 2, 3, 4, 5]
console.log(uniqueNumbers);
```
## 2. Remove Duplicates [Using the `filter()` Method](https://www.school247.org/javascript-array-filter-method/)
The `filter()` method creates a new array with all elements that pass the test implemented by the provided function. By checking the index of each element, duplicates can be filtered out.
### Example:
```javascript
let numbers = [1, 2, 2, 3, 4, 4, 5];
let uniqueNumbers = numbers.filter((value, index, self) => self.indexOf(value) === index);
// Output: [1, 2, 3, 4, 5]
console.log(uniqueNumbers);
```
## 3. Remove Duplicates [Using the `reduce()` Method](https://www.school247.org/javascript-array-reduce-method/)
The `reduce()` method executes a reducer function on each element of the array, resulting in a single output value. It can be used to accumulate unique elements in an array.
### Example:
```javascript
let numbers = [1, 2, 2, 3, 4, 4, 5];
let uniqueNumbers = numbers.reduce((accumulator, value) => {
if (!accumulator.includes(value)) {
accumulator.push(value);
}
return accumulator;
}, []);
// Output: [1, 2, 3, 4, 5]
console.log(uniqueNumbers);
```
## 4. Remove Duplicates [Using `forEach()` Method](https://www.school247.org/javascript-array-foreach-method/)
The `forEach()` method executes a provided function once for each array element. By using an auxiliary object to track unique elements, duplicates can be removed.
### Example:
```javascript
let numbers = [1, 2, 2, 3, 4, 4, 5];
let uniqueNumbers = [];
let seen = {};
numbers.forEach(value => {
if (!seen[value]) {
uniqueNumbers.push(value);
seen[value] = true;
}
});
// Output: [1, 2, 3, 4, 5]
console.log(uniqueNumbers);
```
Removing duplicate elements from a JavaScript array can be achieved using various methods. Whether you prefer the simplicity of the `Set` object, the flexibility of `filter()`, the power of `reduce()`, or the combination of `map()` and `filter()`, JavaScript provides multiple ways to handle this common task effectively. Each method offers unique advantages, so you can choose the one that best suits your specific needs. | d8578raj | |
1,906,302 | Twitter Profile Banner Part 1 | Original: https://codingcat.dev/podcast/twitter-profile-banner-part-1 Hanging out with James Q... | 26,111 | 2024-06-30T04:07:41 | https://codingcat.dev/podcast/twitter-profile-banner-part-1 | webdev, javascript, beginners, podcast |
Original: https://codingcat.dev/podcast/twitter-profile-banner-part-1
{% youtube https://youtu.be/9LvknDBbEx4 %}
Hanging out with James Q Quick and trying to build a Twitter Banner updater. | codercatdev |
1,906,300 | From Idea to Launch: My 30-Day MVP Journey | In the fast-paced world of tech startups, turning an idea into a working product is a wild ride,... | 0 | 2024-06-30T04:04:54 | https://dev.to/praveenkumar/from-idea-to-launch-my-30-day-mvp-journey-2635 | hasura, flutter, cto, mvp | In the fast-paced world of tech startups, turning an idea into a working product is a wild ride, filled with hurdles and uncertainties. As the CTO of Storya, I faced the challenge of transforming a simple no-code prototype into a solid MVP in just 30 days. This journey wasn’t just about coding; it was about strategic planning, teamwork, and a relentless drive for excellence. Let me take you through this exhilarating journey and share the insights that made it all possible.
### The Challenge: 30 Days to a Robust MVP
When I joined Storya as the CTO, I was immediately hit with a big challenge. The existing MVP, built using Adalo, was more of a prototype than a product. We needed something more robust and scalable, and we needed it quickly. With a tight budget and a ticking clock, the mission was clear: build a functional MVP in just 30 days.
### Strategic Planning: Laying the Foundation
Time was short, but jumping in without a plan would have been a disaster. My team and I started by carefully mapping out user journeys. Storya is all about storytelling, so we focused on both creators and readers. This dual approach was key to ensuring our MVP met the needs of our core users. During planning, two tools stood out: Hasura GraphQL and Clean Code Architecture for Flutter. These, combined with our Flutter developers’ expertise, set a strong foundation for our MVP.
### Execution: The Power of Collaboration and Expertise
Our success hinged on the team. When you’re racing against time, every second counts. We couldn't afford long onboarding processes or steep learning curves. Thankfully, I had a team of seasoned pros. Their expertise, along with our strategic tool choices, allowed us to work efficiently. We utilized open-source tools and platforms like AWS ECS, ensuring our setup was both smooth and scalable.
### Reflections and Advice
Looking back, those 30 days were intense, but the lessons were invaluable. If you’re aiming to achieve something similar, remember: the team’s mindset is crucial. At Storya, our shared passion for storytelling kept us going and boosted our productivity. When time is tight, bring in professionals who know their stuff. And don’t underestimate the power of choosing the right tools. Spend time researching and experimenting—it pays off in the end.
### In Conclusion
Building an MVP in 30 days is no easy feat. It requires determination, strategic planning, and a clear vision. But my journey at Storya shows that with the right resources and mindset, it’s not only achievable but a testament to what focused dedication can accomplish.
Thanks for joining me on this journey. If you’re on a similar path, stay focused, plan well, and never underestimate the power of a great team and the right tools. Happy building! | praveenkumar |
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