What is Promise.all in TypeScript?

Can you explain what Promise.all does in TypeScript?

Sure! Promise.all is a method that takes an array of promises and returns a single promise that resolves when all of the promises in the array have resolved.

What happens if one of the promises fails?

If any promise in the array rejects, Promise.all will immediately reject with that reason, and the remaining promises will not be awaited.

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

Absolutely! Here's a simple example:

const promise1 = Promise.resolve(3);
const promise2 = new Promise((resolve, reject) => setTimeout(resolve, 100, 'foo'));
const promise3 = 42;

Promise.all([promise1, promise2, promise3]).then(values => {
  console.log(values); // [3, 'foo', 42]
});

Is there a limit to how many promises I can pass to Promise.all?

No, there's no explicit limit to the number of promises you can pass, but keep in mind that too many concurrent operations can lead to performance issues.