Promise.all()

The Promise.all() static method takes an iterable of promises as input and returns a single Promise. This returned promise fulfills when all of the input’s promises fulfill (including when an empty iterable is passed), with an array of the fulfillment values. It rejects when any of the input’s promises rejects, with this first rejection reason.

The Promise.all() method is one of the promise concurrency methods. It can be useful for aggregating the results of multiple promises. It is typically used when there are multiple related asynchronous tasks that the overall code relies on to work successfully — all of whom we want to fulfill before the code execution continues.

Syntax example: Promise.all(iterable)