Dive into the world of async & await in JavaScript to master seamless, efficient coding! 🚀✨

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Async & Await in JavaScript — Asynchronous programming is a fundamental part of JavaScript, especially in the context of web development where operations like fetching data from a server, reading files, or querying databases are common. JavaScript’s async and await keywords provide a way to write asynchronous code that is easy to read and maintain. In this article, we will dive deep into how async and await work, with coding examples to illustrate their usage.

What is Asynchronous Programming?
Async & Await in JavaScript — Asynchronous programming allows a program to do more than one thing at a time. This is particularly useful in web development to prevent blocking the main thread while waiting for network requests, file I/O, or other time-consuming operations.

Promises
Before async and await, JavaScript developers used Promises to handle asynchronous operations. A Promise is an object representing the eventual completion or failure of an asynchronous operation and its resulting value.

Example of Promise:

function fetchData() {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve('Data received!');
        }, 2000);
    });
}

fetchData().then(response => {
    console.log(response);
}).catch(error => {
    console.error(error);
});

The async and await keywords in JavaScript make it easier to work with Promises. They allow you to write asynchronous code that looks and behaves like synchronous code.

async Keyword

The async keyword is used to declare an asynchronous function. An async function always returns a Promise.

async function fetchData() {
    return 'Data received!';
}

fetchData().then(response => {
    console.log(response);
});

Syntax for Async:

async function myFunction() {
  return "Hello";
}

Example for async

const getData = async () => {
 let data = "Hello World";
 return data;
}

getData().then(data => console.log(data));

Output of the above code Async & Await in JavaScript — Understand the Mechanism:

Hello world

Read More Below

https://codemagnet.in/2024/05/21/async-await-in-javascript-understand-the-mechanism/