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es6-promise

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es6-promise

A lightweight library that provides tools for organizing asynchronous code


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9.2M
decreased by-2.85%
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What is es6-promise?

The es6-promise package is a polyfill for the ECMAScript 6 Promise. It provides a way to handle asynchronous operations in JavaScript by allowing you to associate handlers with an asynchronous action's eventual success value or failure reason. This lets asynchronous methods return values like synchronous methods: instead of immediately returning the final value, the asynchronous method returns a promise to supply the value at some point in the future.

What are es6-promise's main functionalities?

Creating a Promise

This feature allows you to create a new Promise object. The constructor of Promise takes a function that takes two arguments, resolve and reject, which are functions themselves. You perform the asynchronous operation within this function and call resolve upon successful completion with the result, or reject with an error.

var promise = new Promise(function(resolve, reject) {
  // do something asynchronous which eventually calls either:
  //   resolve(someValue); // fulfilled
  // or
  //   reject("failure reason"); // rejected
});

Using a Promise

This feature demonstrates how to use a Promise. Once a Promise has been created, you can attach success and failure handlers to it using the .then method. The first function passed to .then is called if the Promise is resolved, and the second is called if it is rejected.

promise.then(function(value) {
  // success
}, function(value) {
  // failure
});

Chaining Promises

Promises can be chained, meaning that the result of one promise can be used to create another promise, forming a chain of promises. This is useful for performing a series of asynchronous operations in sequence.

new Promise(function(resolve, reject) {
  setTimeout(() => resolve(1), 1000);
}).then(function(result) {
  console.log(result); // 1
  return result * 2;
}).then(function(result) {
  console.log(result); // 2
  return result * 2;
}).then(function(result) {
  console.log(result); // 4
  return result * 2;
});

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Package last updated on 06 Jun 2019

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