Javascript Promise Methods With Polyfill Example: A Cheat Sheet for Developers
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Promise is a way to handle asynchronous operations in JavaScript. Promise consists of three states: Pending: Neither fulfilled nor rejected. Fulfilled: Completed Promise (success) Rejected: Failed Promise (failure) Promise all takes an array of promises as input and returns a promise object. The returned promise will be resolved when all the promises in the input array are resolved. If any of the promises is rejected, it will be rejected with the reason for the first rejected promise. Polyfill is also a way of handling asynchronous operations.