asyn.txt

//Synchronus js
JavaScript is single-threaded, meaning it can only do one thing at a time.
It executes code sequentially, one statement at a time.

//Asynchronous js
Asynchronous JavaScript (Async JS) is a programming approach that allows tasks to run independently
*in the background, without blocking the main program's execution. It enables non-blocking behavior,
making it possible to efficiently handle time-consuming operations like fetching data from the internet,
processing large files, or responding to user interactions while keeping the application responsive.
Async JS uses techniques like callbacks, promises, and async/await to manage and coordinate these
asynchronous tasks, ensuring smoother and more efficient code execution.


//Call Stack:
Think of the call stack as a stack of tasks that the JavaScript engine needs to perform.
When a function is called, it's added to the stack, and when it's done, it's removed from the stack.


//Event Loop and Callback Queue:
JavaScript often has to deal with asynchronous tasks, like timers, network requests, or user events.
These tasks are managed by the event loop and the callback queue.
The event loop continuously checks the call stack and the callback queue.


//Handling Asynchronous Tasks:
When an asynchronous task is encountered (e.g., setTimeout, an event listener, or a promise), it's scheduled 
to run in the future. The event loop checks if the call stack is empty. If it is, it takes the next task from
 the callback queue and puts it into the call stack for execution.

 The event loop monitors the callback queue and pushes tasks into the call stack when it's empty, allowing 
 JavaScript to handle asynchronous tasks without blocking the main thread. However, it doesn't interrupt the 
 execution of the global execution context; it waits for it to finish before processing asynchronous tasks.