Async/Await is a syntax feature that enables asynchronous programming in JavaScript. It makes the code cleaner and more readable by allowing you to use await to pause the execution of the function until a Promise is resolved or rejected.

Key Concepts

  • Promises: A Promise is an object representing the eventual completion or failure of an asynchronous operation.
  • Async Functions: A function declared with async keyword is a function declaration or an arrow function declaration that can contain await expressions.

Usage

Here's a simple example of how to use async and await:

async function fetchData() {
  const response = await fetch('/api/data');
  const data = await response.json();
  return data;
}

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

In the above example, fetchData is an async function that fetches data from an API. The await keyword is used to pause the execution until the fetch call is completed. Once the promise is resolved, the data is logged to the console.

Benefits

  • Cleaner Code: Async/Await makes asynchronous code easier to read and understand.
  • Improved Performance: It can help improve the performance of your application by avoiding unnecessary blocking of the main thread.
  • Error Handling: It provides a more intuitive way to handle errors in asynchronous operations.

Further Reading

For more information on Async/Await, you can read the official documentation.

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JavaScript

JavaScript