.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/README.md

   1 # core-js
   2
   3 [![Open Collective](https://opencollective.com/core-js/all/badge.svg?label=open%20collective)](https://opencollective.com/core-js) [![version](https://img.shields.io/npm/v/core-js.svg)](https://www.npmjs.com/package/core-js) [![core-js downloads](https://img.shields.io/npm/dm/core-js.svg?label=npm%20i%20core-js)](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18) [![core-js-pure downloads](https://img.shields.io/npm/dm/core-js-pure.svg?label=npm%20i%20core-js-pure)](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18) [![tests](https://github.com/zloirock/core-js/workflows/tests/badge.svg)](https://github.com/zloirock/core-js/actions) [![eslint](https://github.com/zloirock/core-js/workflows/eslint/badge.svg)](https://github.com/zloirock/core-js/actions)
   4
   5 > Modular standard library for JavaScript. Includes polyfills for [ECMAScript up to 2021](https://github.com/zloirock/core-js#ecmascript): [promises](https://github.com/zloirock/core-js#ecmascript-promise), [symbols](https://github.com/zloirock/core-js#ecmascript-symbol), [collections](https://github.com/zloirock/core-js#ecmascript-collections), iterators, [typed arrays](https://github.com/zloirock/core-js#ecmascript-typed-arrays), many other features, [ECMAScript proposals](https://github.com/zloirock/core-js#ecmascript-proposals), [some cross-platform WHATWG / W3C features and proposals](#web-standards) like [`URL`](https://github.com/zloirock/core-js#url-and-urlsearchparams). You can load only required features or use it without global namespace pollution.
   6
   7 ## As advertising: the author is looking for a good job -)
   8
   9 ## [core-js@3, babel and a look into the future](https://github.com/zloirock/core-js/tree/master/docs/2019-03-19-core-js-3-babel-and-a-look-into-the-future.md)
  10
  11 ## Raising funds
  12
  13 `core-js` isn't backed by a company, so the future of this project depends on you. Become a sponsor or a backer if you are interested in `core-js`: [**Open Collective**](https://opencollective.com/core-js), [**Patreon**](https://patreon.com/zloirock), [**PayPal**](https://paypal.me/zloirock), **Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz )**.
  14
  15 ---
  16
  17 <a href="https://opencollective.com/core-js/sponsor/0/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/0/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/1/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/1/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/2/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/2/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/3/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/3/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/4/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/4/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/5/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/5/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/6/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/6/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/7/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/7/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/8/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/8/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/9/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/9/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/10/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/10/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/11/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/11/avatar.svg"></a>
  18
  19 ---
  20
  21 <a href="https://opencollective.com/core-js#backers" target="_blank"><img src="https://opencollective.com/core-js/backers.svg?width=890"></a>
  22
  23 ---
  24
  25 [*Example*](http://goo.gl/a2xexl):
  26 ```js
  27 import 'core-js'; // <- at the top of your entry point
  28
  29 Array.from(new Set([1, 2, 3, 2, 1]));          // => [1, 2, 3]
  30 [1, [2, 3], [4, [5]]].flat(2);                 // => [1, 2, 3, 4, 5]
  31 Promise.resolve(32).then(x => console.log(x)); // => 32
  32 ```
  33
  34 *You can load only required features*:
  35 ```js
  36 import 'core-js/features/array/from'; // <- at the top of your entry point
  37 import 'core-js/features/array/flat'; // <- at the top of your entry point
  38 import 'core-js/features/set';        // <- at the top of your entry point
  39 import 'core-js/features/promise';    // <- at the top of your entry point
  40
  41 Array.from(new Set([1, 2, 3, 2, 1]));          // => [1, 2, 3]
  42 [1, [2, 3], [4, [5]]].flat(2);                 // => [1, 2, 3, 4, 5]
  43 Promise.resolve(32).then(x => console.log(x)); // => 32
  44 ```
  45
  46 *Or use it without global namespace pollution*:
  47 ```js
  48 import from from 'core-js-pure/features/array/from';
  49 import flat from 'core-js-pure/features/array/flat';
  50 import Set from 'core-js-pure/features/set';
  51 import Promise from 'core-js-pure/features/promise';
  52
  53 from(new Set([1, 2, 3, 2, 1]));                // => [1, 2, 3]
  54 flat([1, [2, 3], [4, [5]]], 2);                // => [1, 2, 3, 4, 5]
  55 Promise.resolve(32).then(x => console.log(x)); // => 32
  56 ```
  57
  58 **It's a global version (first 2 examples), for more info see [`core-js` documentation](https://github.com/zloirock/core-js/blob/master/README.md).**