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  1. ![logo](https://user-images.githubusercontent.com/2213682/146607186-8e13ddef-26a4-4ebf-befd-5aac9d77c090.png)
    2. 

  2. 

  3. <div align="center">
    4. 

  4. 

  5. [![fundraising](https://opencollective.com/core-js/all/badge.svg?label=fundraising)](https://opencollective.com/core-js) [![PRs welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://github.com/zloirock/core-js/blob/master/CONTRIBUTING.md) [![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)
    6. 

  6. 

  7. </div>
    8. 

  8. 

  9. **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)**
    10. 

  10. ---
    11. 

  11. 

  12. > 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.
    13. 

  13. 

  14. ## Raising funds
    15. 

  15. 

  16. `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).
    17. 

  17. 

  18. ---
    19. 

  19. 

  20. <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>
    21. 

  21. 

  22. ---
    23. 

  23. 

  24. <a href="https://opencollective.com/core-js#backers" target="_blank"><img src="https://opencollective.com/core-js/backers.svg?width=890"></a>
    25. 

  25. 

  26. ---
    27. 

  27. 

  28. [*Example of usage*](https://tinyurl.com/2mknex43):
    29. 

  29. ```js
    30. 

  30. import 'core-js/actual';
    31. 

  31. 

  32. Promise.resolve(42).then(it => console.log(it)); // => 42
    33. 

  33. 

  34. Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
    35. 

  35. 

  36. [1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]
    37. 

  37. 

  38. (function * (i) { while (true) yield i++; })(1)
    39. 

  39.   .drop(1).take(5)
    40. 

  40.   .filter(it => it % 2)
    41. 

  41.   .map(it => it ** 2)
    42. 

  42.   .toArray(); // => [9, 25]
    43. 

  43. 

  44. structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
    45. 

  45. ```
    46. 

  46. 

  47. *You can load only required features*:
    48. 

  48. ```js
    49. 

  49. import 'core-js/actual/promise';
    50. 

  50. import 'core-js/actual/set';
    51. 

  51. import 'core-js/actual/iterator';
    52. 

  52. import 'core-js/actual/array/from';
    53. 

  53. import 'core-js/actual/array/flat-map';
    54. 

  54. import 'core-js/actual/structured-clone';
    55. 

  55. 

  56. Promise.resolve(42).then(it => console.log(it)); // => 42
    57. 

  57. 

  58. Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
    59. 

  59. 

  60. [1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]
    61. 

  61. 

  62. (function * (i) { while (true) yield i++; })(1)
    63. 

  63.   .drop(1).take(5)
    64. 

  64.   .filter(it => it % 2)
    65. 

  65.   .map(it => it ** 2)
    66. 

  66.   .toArray(); // => [9, 25]
    67. 

  67. 

  68. structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
    69. 

  69. ```
    70. 

  70. 

  71. *Or use it without global namespace pollution*:
    72. 

  72. ```js
    73. 

  73. import Promise from 'core-js-pure/actual/promise';
    74. 

  74. import Set from 'core-js-pure/actual/set';
    75. 

  75. import Iterator from 'core-js-pure/actual/iterator';
    76. 

  76. import from from 'core-js-pure/actual/array/from';
    77. 

  77. import flatMap from 'core-js-pure/actual/array/flat-map';
    78. 

  78. import structuredClone from 'core-js-pure/actual/structured-clone';
    79. 

  79. 

  80. Promise.resolve(42).then(it => console.log(it)); // => 42
    81. 

  81. 

  82. from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]
    83. 

  83. 

  84. flatMap([1, 2], it => [it, it]); // => [1, 1, 2, 2]
    85. 

  85. 

  86. Iterator.from(function * (i) { while (true) yield i++; }(1))
    87. 

  87.   .drop(1).take(5)
    88. 

  88.   .filter(it => it % 2)
    89. 

  89.   .map(it => it ** 2)
    90. 

  90.   .toArray(); // => [9, 25]
    91. 

  91. 

  92. structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
    93. 

  93. ```
    94. 

  94. 

  95. **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).**
    96.