What is the best way to handle the resolution of multiple promises as they complete?

Suppose I have three different promises each taking a varying amount of time to resolve - 1000ms, 2000ms, and 3000ms respectively.

How can I simultaneously start all the promises and handle them as they get resolved?

For instance:

let quickPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve(""), 1000);
});

let normalPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve(""), 2000);
});

let slowPromise = new Ppromise((resolve, reject) => {
    setTimeout(() => resolve(""), 4000);
});

In such a scenario, the goal would be to initiate all three promises simultaneously and manage their resolution sequentially - starting with the quickPromise, followed by the normalPromise, and lastly the slowPromise.

Answer №1

If you find yourself in need of a common handler for all your Promises, there is a simple way to achieve this:

const fastPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve("fast"), 1000);
});

const mediumPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve("medium"), 2000);
});

const slowPromise = new Promise((resolve, reject) => {
    setTimeout(() => resolve("slow"), 4000);
});

function commonHandler(result) {
  console.log(result);
}

[fastPromise, mediumPromise, slowPromise].forEach((p) => p.then(commonHandler));

(remember to include .catch() as well).

On the other hand, if you simply want to run X number of Promises and handle them individually as they resolve, you can just use the default Promise behavior without any additional steps except adding .then() to each Promise.

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