How do I use 'then' and 'catch' in JavaScript?

How do I use 'then' and 'catch' in JavaScript?

In JavaScript, 'then' and 'catch' are used to handle promises. 'then' is for handling successful outcomes, while 'catch' is for errors.

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

Sure! Here's a simple example:

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

What happens if I don't use 'catch'?

If you don't use 'catch', any errors that occur in the promise chain will be unhandled, which can lead to unhandled promise rejections.

Is it possible to use multiple 'then' statements?

Yes, you can chain multiple 'then' statements to handle different stages of the promise resolution.