Javascript — Polyfill for Promise.all, allSettled, race and any

There are 6 static methods in the Promise class.

Promise.all

• Wait for all promises to be fulfilled, or for any to be rejected.
• If the returned promise fulfills, it is fulfilled with an aggregating array of the values from the fulfilled promises, in the same order as defined in the iterable of multiple promises.
• If it rejects, it is rejected with the reason from the first promise in the iterable that was rejected.

Polyfill:-

Promise.allSettled

• Wait until all promises have settled (each may fulfill or reject).
• Returns a Promise that fulfills after all of the given promises is either fulfilled or rejected, with an array of objects that each describe the outcome of each promise.

Polyfill:-

Promise.any

Takes an iterable of Promise objects and, as soon as one of the promises in the iterable fulfills, returns a single promise that fulfills with the value from that promise.

Polyfill:-

Promise.race

• Wait until any of the promises is fulfilled or rejected.
• If the returned promise fulfills, it is fulfilled with the value of the first promise in the iterable that fulfilled.
• If it rejects, it is rejected with the reason from the first promise that was rejected.

Polyfill:-

Sources

MDN