ADVANCED JAVASCRIPT: Unlocking the Power of ES6, Asynchronous Programming, and Functional Concepts by Turner Matt H

Author:Turner, Matt H.
Language: eng
Format: epub
Published: 2025-08-13T00:00:00+00:00

Promise.allSettled([p1, p2])

.then(results => {

console.log(results);

});

// Output:

// [

// { status: 'fulfilled', value: 'Success!' },

// { status: 'rejected', reason: 'Failure!' }

// ]

Promise.allSettled() is ideal for when you want to run multiple independent tasks and you don't want one failure to prevent you from seeing the results of the successful ones.

What if you only care about the first promise to complete? For this, we have Promise.race(iterable). As the name implies, it creates a race. It returns a promise that settles as soon as the first promise in the iterable settles. If the first promise to settle is fulfilled, the Promise.race promise fulfills with the same value. If the first promise to settle is rejected, it rejects with the same reason.

A classic use case for Promise.race is implementing a timeout for an asynchronous operation. You can race a promise for your operation against a promise that rejects after a certain amount of time.

JavaScript

function longRunningOperation() {

return new Promise(resolve => setTimeout(() => resolve('Operation complete!'), 5000));

}

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