implement Promise.allSettled()

Question

The Promise.allSettled() method returns a promise that resolves after all of the given promises have either fulfilled or rejected, with an array of objects that each describes the outcome of each promise.

• from MDN

Different from Promise.all() which rejects right away once an error occurs, Promise.allSettled() waits for all promises to settle.

Now can you implement your own allSettled() ?

note

Do not use Promise.allSettled() directly, it helps nothing.

Code

/**
 * @param {Array<any>} promises - notice that input might contains non-promises
 * @return {Promise<Array<{status: 'fulfilled', value: any} | {status: 'rejected', reason: any}>>}
 */
function allSettled(promises) {
  // your code here
}

Related

• implement async helper - parallel()
• implement Promise.all()
• implement Promise.any()
• implement Promise.race()

Source

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