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96 lines
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96 lines
6.0 KiB
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<div align="center">
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[](https://opencollective.com/core-js) [](https://github.com/zloirock/core-js/blob/master/CONTRIBUTING.md) [](https://www.npmjs.com/package/core-js) [](https://npm-stat.com/charts.html?package=core-js&package=core-js-pure&package=core-js-compat&from=2014-11-18)
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</div>
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**I highly recommend reading this: [So, what's next?](https://github.com/zloirock/core-js/blob/master/docs/2023-02-14-so-whats-next.md)**
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---
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> Modular standard library for JavaScript. Includes polyfills for [ECMAScript up to 2023](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.
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## Raising funds
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`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), [**Boosty**](https://boosty.to/zloirock), **Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz )**, [**Alipay**](https://user-images.githubusercontent.com/2213682/219464783-c17ad329-17ce-4795-82a7-f609493345ed.png).
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---
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<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>
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---
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<a href="https://opencollective.com/core-js#backers" target="_blank"><img src="https://opencollective.com/core-js/backers.svg?width=890"></a>
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---
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[*Example of usage*](https://tinyurl.com/2mknex43):
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```js
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import 'core-js/actual';
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Promise.resolve(42).then(it => console.log(it)); // => 42
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Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
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[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]
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(function * (i) { while (true) yield i++; })(1)
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.drop(1).take(5)
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.filter(it => it % 2)
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.map(it => it ** 2)
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.toArray(); // => [9, 25]
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
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```
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*You can load only required features*:
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```js
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import 'core-js/actual/promise';
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import 'core-js/actual/set';
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import 'core-js/actual/iterator';
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import 'core-js/actual/array/from';
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import 'core-js/actual/array/flat-map';
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import 'core-js/actual/structured-clone';
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Promise.resolve(42).then(it => console.log(it)); // => 42
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Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
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[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]
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(function * (i) { while (true) yield i++; })(1)
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.drop(1).take(5)
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.filter(it => it % 2)
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.map(it => it ** 2)
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.toArray(); // => [9, 25]
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
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```
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*Or use it without global namespace pollution*:
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```js
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import Promise from 'core-js-pure/actual/promise';
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import Set from 'core-js-pure/actual/set';
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import Iterator from 'core-js-pure/actual/iterator';
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import from from 'core-js-pure/actual/array/from';
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import flatMap from 'core-js-pure/actual/array/flat-map';
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import structuredClone from 'core-js-pure/actual/structured-clone';
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Promise.resolve(42).then(it => console.log(it)); // => 42
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from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
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flatMap([1, 2], it => [it, it]); // => [1, 1, 2, 2]
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Iterator.from(function * (i) { while (true) yield i++; }(1))
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.drop(1).take(5)
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.filter(it => it % 2)
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.map(it => it ** 2)
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.toArray(); // => [9, 25]
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structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
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```
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**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).**
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