How does parallel promise execution work in JavaScript?

How does parallel promise execution work in JavaScript?

In JavaScript, parallel promise execution allows multiple promises to run simultaneously. This is often achieved using Promise.all().

Can you give me an example of using Promise.all?

Sure! Here's a simple example:

const promise1 = fetch('https://api.example.com/data1');
const promise2 = fetch('https://api.example.com/data2');

Promise.all([promise1, promise2])
  .then(responses => Promise.all(responses.map(res => res.json())))
  .then(data => console.log(data));

What happens if one of the promises fails?

If any promise in the Promise.all() array rejects, the entire operation fails and the catch block is executed.

Is there a way to handle individual promise failures?

Yes! You can use Promise.allSettled() to handle each promise's outcome, regardless of whether they succeed or fail.