Whats is Asynchronous in Javascript ?
buayaberdiri.blogspot.com - Asynchronous JavaScript is a programming paradigm that enables web developers to build fast, concurrent applications. It allows the browser to run multiple JavaScript tasks in parallel, rather than sequentially, which can greatly improve the performance of web applications.
There are several ways to implement asynchronous JavaScript, but the most common is through the use of callbacks. A callback is a function that is passed as an argument to another function and is executed after the outer function has completed. For example:
function greeting(name, callback) {
console.log('Hello, ' + name + '!');
callback();
}
greeting('Deniu', function() {
console.log('how are you today ?.');
});
In this example, the greeting function takes two arguments: a name and a callback function. When the greeting function is called, it logs a greeting message and then calls the callback function.
Another way to implement asynchronous JavaScript is through the use of Promises. A Promise is an object that represents the eventual completion or failure of an asynchronous operation. Promises provide a simpler alternative to callbacks and are especially useful when working with multiple async operations that need to be chained together. Here is an example using Promises:
const myPromise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('The operation was successful.');
}, 1000);
});
myPromise.then((result) => {
console.log(result);
});
In this example, we create a new Promise object that will resolve with a message after one second. We then use the then method to log the result of the Promise to the console.
Asynchronous JavaScript is an essential part of modern web development and is used in a wide variety of applications. Whether you are using callbacks or Promises, mastering asynchronous programming techniques will help you build faster, more efficient web applications.
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