React 19: They Fixed React Js  (Everything you need to know)

Worker threads were initially added as an experimental feature in Node.js 10. x.x and became stable in Node.js 12. x.x. Node.js, designed for single-threaded execution, is ideal for handling non-blocking I/O operations. However, it faces challenges with CPU-heavy tasks, as these tasks can cause the main thread to become blocked, hindering the execution of other operations.

In another word when it comes to CPU-intensive tasks, Node executes blocking code in the main thread and blocks other code for execution. 

**As a solution to this Node introduced Worker threads in Node Js 12 .x.x.**


> When performing intensive synchronous operations, such as complex calculations on a large dataset, it can severely impact performance. A synchronous block of code that takes a long time to execute can block the rest of the application. For instance, imagine a scenario where a calculation takes 10 seconds to complete. This delay can lead to significant bottlenecks, affecting the system's responsiveness and ability to handle multiple tasks efficiently. Here are three examples to illustrate this issue

1. Web Server Request Handling
2. Data Processing in a Background Service

We all know Node js (Javascript) is not meant for this kind of CPU-intensive task. If we do something like this in Node Js it will freeze the UI in the browser and queue any I/O event in Node.js.

### Now Let's see how Worker threads are solution for this issue in node js

> Worker threads in Node.js are similar to WebWorkers in the browser. Browsers have long used Workers to run scripts in parallel, allowing for multitasking. In Node.js, worker threads provide a way to execute JavaScript code concurrently, enabling efficient handling of blocking operations.

> One effective method to prevent a blocking operation from halting the entire application is to run it in a separate thread. By doing so, the main thread remains available to handle other tasks while the intensive operation runs independently. This approach is utilized in Node.js with Worker Threads.

Here’s a clearer explanation:

**1. Understanding Worker Threads**:  Worker threads allow JavaScript code to be executed in parallel, much like how WebWorkers function in browsers. This enables multiple tasks to be performed simultaneously, improving efficiency and responsiveness.

**2. Benefits of Using Separate Threads** : Running a blocking operation, such as a complex calculation, in a separate thread ensures that the main thread remains unblocked. This means that the application can continue to respond to user interactions or handle other requests while the intensive task is processed independently.

**3. Practical Example in Node.js**: Suppose you have a Node.js application that needs to perform a heavy computation, like data analysis on a large dataset. If this computation runs on the main thread, it will block the entire application, making it unresponsive. By using a Worker Thread, the computation can run in the background, allowing the main thread to continue handling other operations, such as serving web requests or responding to user inputs.

### Now Let's see how node js runs when it's only in a single thread.

> When a Node.js process starts, it includes several key components:
Single Process: A process is a global object accessible throughout the application, containing information about the execution context.

**1. Single Thread**: Node.js operates on a single thread, meaning only one sequence of instructions is executed at a time within a given process.

**2. Single Event Loop:** The event loop is crucial to Node.js's asynchronous capabilities. It enables non-blocking I/O operations by delegating tasks to the system kernel and handling them with callbacks, promises, or async/await. This is how Node.js manages to be efficient despite JavaScript's single-threaded nature.

**3. Single JavaScript Engine Instance**: This component is responsible for executing JavaScript code within the Node.js environment.

**4. Single Node.js Instance**: This is the program that runs Node.js code, enabling the execution of server-side JavaScript.

Each of these components plays a vital role in how Node.js operates, ensuring it can handle multiple tasks efficiently while remaining single-threaded.

### Now With the worker thread, it's  run like this

In contrast, worker threads in Node.js include the following components:

1. **Single Process:**
   There is still only one overall process.

2. **Multiple Threads:**
   Worker threads enable the use of multiple threads, allowing concurrent execution of different tasks.

3. **One Event Loop per Thread:**
   Each thread has its own event loop, enabling asynchronous operations within that thread.

4. **One JavaScript Engine Instance per Thread:**
   Each thread runs its own instance of the JavaScript engine, allowing parallel execution of JavaScript code.

5. **One Node.js Instance per Thread:**
   Each thread operates its own instance of the Node.js runtime, facilitating the execution of Node.js code concurrently across multiple threads.

![Node Worker Threds Example.png](https://media.graphassets.com/69TLOY8nQBSllhEtdREe)
*(Image Source : Internet)*

So this is how we can use multi-threading in Node js using worker thread.


What is a worker thread in Node Js and How does it work?

**Nginx is a high-performance, open-source web server software renowned for its speed, reliability, and scalability. Originally developed to address the scalability issues of the Apache web server, Nginx has gained widespread popularity for its efficiency in serving static content, handling high traffic loads, and acting as a reverse proxy server.**



> Imagine you're hosting a grand gathering, and numerous guests are arriving at your residence. Some seek to indulge in games in the backyard, others aim to engage in conversations in the living room, and a few desire to dance in the garage. Chaos would ensue if all attempted to enter through the front door simultaneously!

Enter Nginx. It acts as a savvy host, directing each guest seamlessly to their desired destination without any confusion.

Consider having a website comprising distinct sections: a blog, an online store, and a forum. Each segment resides on a separate computer in your abode (or server, in technical terms). Instead of having visitors knock on the front door and then wander throughout the house to locate their interests, Nginx positions itself at the entrance, inquiring, "What brings you here?"
![NginX.webp](https://media.graphassets.com/lJ48kKbeRTSzKDNouZ84)
If someone wishes to peruse your blog, Nginx promptly responds, "Follow me, and I'll lead you straight there!" guiding them directly to the blog section. Similarly, if another individual intends to make a purchase from your online store, Nginx efficiently directs them without delay. It's akin to having a personal guide for your website!

Yet, Nginx isn't limited to assisting one person at a time; it excels at managing numerous visitors concurrently. It adeptly handles hundreds, thousands, even millions of individuals accessing your website, ensuring each finds their way without any hassle.

Moreover, Nginx contributes to maintaining the security and integrity of your website. It adeptly shields your digital residence from unwelcome intruders while ensuring seamless operations behind the scenes.

### Setting up NGINX on Ubuntu and Configuring Firewall with UFW

To install NGINX on Ubuntu, open your terminal and execute the following command:

> `sudo apt-get install nginx`

Configuring Firewall with UFW:
After installing NGINX, you need to configure the firewall to allow incoming traffic on ports 80 (HTTP) and 443 (HTTPS). We'll use UFW, a user-friendly interface for managing iptables firewall rules.

> ` sudo ufw allow ssh`

First, allow SSH to ensure you don't get locked out of your server:

> `sudo ufw allow ssh`

Next, allow HTTP and HTTPS traffic by enabling the 'Nginx Full' profile, which opens both port 80 and port 443:

> `sudo ufw allow 'Nginx Full'`

Finally, enable UFW to apply the configured rules:

> ` sudo ufw enable`



Learn how to use Nginx as a Reverse Proxy - Part 01

React has announced the release of a new compiler, which will improve the developer experience by simplifying code and removing unnecessary features like use memo and forward ref.

### Highlights:

- React's new compiler promises a groundbreaking improvement in the developer experience.

- jQuery has also made headlines with the announcement of version 4.0, dropping support for IE1 and migrating to ES modules.

- The new React compiler simplifies code by removing features like useMemo and forwardRef.

- The compiler eliminates the need for memoization, making code more straightforward.

- Complex features such as forwardRef and server actions will be replaced with simpler alternatives.

- Handling promises and async/await becomes easier with React's new compiler.

- React's improvements align it more closely with other frameworks, potentially leading to similar APIs.

### Key Insights:

React's new compiler significantly simplifies code by removing complex features, such as useMemo and forwardRef, reducing mental overhead for developers.
![useForwrodref.png](https://media.graphassets.com/2aff1CifTJC5N4Na00Wp)

The compiler also improves the handling of promises and async/await, streamlining asynchronous operations in React.

The convergence of React's API with other frameworks may lead to a more standardized and unified development ecosystem.

The removal of features like useMemo and forwardRef simplifies the codebase and makes React more accessible to developers.
![ray-so-export.png](https://media.graphassets.com/5si4hHphROyJYxsdNyf2)
The compiler's optimizations not only boost performance but also enhance the developer experience by reducing the need for manual optimization techniques.

React's new compiler reflects the ongoing trend of simplification and standardization in frontend development, facilitating easier framework transitions and maintaining codebase consistency.

These improvements highlight the continuous evolution of frontend development, with frameworks like React adapting to meet the evolving needs of developers and users.


React 19: They Fixed React Js (Everything you need to know)

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