What is promise chaining in JavaScript?

What is promise chaining in JavaScript?

Promise chaining is a technique in JavaScript that allows you to execute asynchronous operations in sequence. It involves returning a promise from a function and using the .then() method to handle the result of the previous promise.

Can you give me an example of promise chaining?

Sure! Here's a simple example:

fetch('https://api.example.com/data')
  .then(response => response.json())
  .then(data => {
    console.log(data);
    return fetch('https://api.example.com/other-data');
  })
  .then(otherResponse => otherResponse.json())
  .then(otherData => console.log(otherData));

What happens if one of the promises fails?

If a promise in the chain fails, the control will jump to the nearest .catch() method in the chain, allowing you to handle the error gracefully.

How can I handle errors in promise chaining?

You can handle errors by adding a .catch() at the end of your promise chain. For example:

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