What is the difference between JavaScript Promises and Async/Await?

What is the difference between JavaScript Promises and Async/Await?

JavaScript Promises are objects that represent the eventual completion or failure of an asynchronous operation. Async/Await is syntactic sugar built on top of Promises, allowing for a more synchronous-looking code structure.

Can you give me an example of how to use both?

Sure! Here's a simple example:

Using Promises:

fetch('https://api.example.com/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));

Using Async/Await:

async function fetchData() {
  try {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error(error);
  }
}
fetchData();

Which one is better to use?

It depends on the context. Async/Await can make your code cleaner and easier to read, especially with multiple asynchronous calls. However, Promises are still very powerful and useful in certain scenarios.

Are there any performance differences between them?

In terms of performance, there isn't a significant difference. Both are built on the same underlying mechanism, but Async/Await may introduce a slight overhead due to its syntactic sugar. The choice should be based on code readability and maintainability.