[ad_1]
Title: Mastering Asynchronous Programming in Javascript
Asynchronous programming in Javascript is becoming more popular these days due to its ability to handle tasks that take a lot of time to process, such as retrieving data from an API or database, without blocking other tasks from executing on the main thread. In this article, we will explore the basics of asynchronous programming in Javascript and how to master it using callbacks, promises, and async/await.
Callbacks
Callbacks are essentially functions that get executed once a certain task is completed. They are one of the earliest methods of handling asynchronous programming in Javascript.
Here is a sample code for a callback function that logs the result of a network request once it is done:
“`javascript
function getDataFromServer(callback) {
const xhr = new XMLHttpRequest();
xhr.open(‘GET’, ‘https://jsonplaceholder.typicode.com/todos/1’);
xhr.onload = () => {
callback(xhr.responseText);
}
xhr.send();
}
getDataFromServer((result) => {
console.log(result);
});
“`
Promises
Promises are another way to handle asynchronous programming in Javascript. They were introduced to make asynchronous code more manageable and less prone to errors compared to using callbacks.
Here is a sample code for a promise that resolves after a network request is complete:
“`javascript
function getDataFromServer() {
return new Promise((resolve, reject) => {
const xhr = new XMLHttpRequest();
xhr.open(‘GET’, ‘https://jsonplaceholder.typicode.com/todos/1’);
xhr.onload = () => {
resolve(xhr.responseText);
}
xhr.onerror = () => {
reject(xhr.statusText);
}
xhr.send();
});
}
getDataFromServer()
.then((result) => {
console.log(result);
})
.catch((error) => {
console.error(error);
});
“`
Async/Await
Async/Await is a newer way of handling asynchronous programming in Javascript, and it is supported in ES2017 or later versions. Async/Await allows you to write asynchronous code in a synchronous manner, making it easier to read and understand.
Here is a sample code for an Async/Await function that retrieves data from an API:
“`javascript
async function getDataFromAPI() {
try {
const response = await fetch(‘https://jsonplaceholder.typicode.com/todos/1’);
const result = await response.json();
console.log(result);
} catch (error) {
console.error(error);
}
}
getDataFromAPI();
“`
Conclusion
In conclusion, mastering asynchronous programming in Javascript is crucial for developing scalable and efficient applications. Whether you choose to use callbacks, promises, or async/await, it is important to understand how they work and when to use them. By using these techniques, you can enhance the user experience of your application, reduce loading times, and deliver better performance.
[ad_2]