Async/await is a feature in JavaScript used to make asynchronous code look and behave synchronously, reducing the complexity and making the code easier to read and understand. Traditionally, the process of handling async code involves using callbacks and promises, which can be complex and difficult to maintain.
To use async/await, we first declare a function with the async keyword before the function name. Then we use the await keyword before any asynchronous function call within the function. The await keyword is followed by the promise or a function that returns a promise.
Here is an example of how async/await works:
async function fetchUserData() {
const response = await fetch('https://jsonplaceholder.typicode.com/users');
const data = await response.json();
return data;
}
fetchUserData().then(data => console.log(data)).catch(err=> console.log(err));
In this example, fetchUserData() is declared as an async function. It makes two asynchronous calls, one to fetch data from an API and then parses the response using the .json() method. The await keyword waits for each async operation to complete before moving on to the next step in the function.
Finally, the function returns the parsed data. The code then calls fetchUserData() and handles the returned data using a promise chain.
Async/await is a powerful tool for managing complex async code in JavaScript. By making the code look and behave synchronously, it reduces the complexity and makes the code easier to debug and maintain.
