# ND-PROMISE > :two_hearts: Lightweight ES6 Promise polyfill for the browser and node. Adheres closely to the spec. It is a perfect polyfill IE, Firefox or any other browser that does not support native promises. [](https://travis-ci.org/ndfront/nd-promise) [](https://coveralls.io/github/ndfront/nd-promise) [](https://david-dm.org/ndfront/nd-promise) [](https://david-dm.org/ndfront/nd-promise#info=devDependencies) [](https://npmjs.org/package/nd-promise) This implementation is based on [taylorhakes/promise-polyfill](https://github.com/taylorhakes/promise-polyfill) and [then/promise](https://github.com/then/promise). It has been changed to use the prototype for performance and memory reasons. For API information about Promises, please check out this article [HTML5Rocks article](http://www.html5rocks.com/en/tutorials/es6/promises/). ## Browser Support IE8+, Chrome, Firefox, IOS 4+, Safari 5+, Opera ## Change Log ### New in 3.0.3 Remove function bind; use rollup instead of webpack ### New in 3.0.2 IE8 compatibility ### New in 2.4.0 Rewrite core and test with ES6 ### New in 2.3.0 ``` js new Promise(function(resolve, reject, notify) { // resolve, reject, notify }).then(function(value) { // do something }).catch(function(error) { // do something }).progress(function(value) { // do something }).finally(function() { // do something }) ``` ### New in 2.2.0 ``` js new Promise(function(resolve, reject, notify) { notify(40) setTimeout(function() { notify(55) }, 50) }).progress(function(value) { console.log(value) }) ``` ## Usage ### cjs ``` bash $ npm install nd-promise ``` ### iife - [nd-promise](index.js) [minified](index.min.js) ## Example ```js const prom = new Promise(function(resolve, reject) { // do a thing, possibly async, then… if (/* everything turned out fine */) { resolve("Stuff worked!"); } else { reject(new Error("It broke")); } }); // Do something when async done prom.then(function() { ... }); ``` ## Testing ``` bash npm install npm test ``` ## License MIT