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  1. # array-unique [![NPM version](https://img.shields.io/npm/v/array-unique.svg?style=flat)](https://www.npmjs.com/package/array-unique) [![NPM downloads](https://img.shields.io/npm/dm/array-unique.svg?style=flat)](https://npmjs.org/package/array-unique) [![Build Status](https://img.shields.io/travis/jonschlinkert/array-unique.svg?style=flat)](https://travis-ci.org/jonschlinkert/array-unique)
  2. Remove duplicate values from an array. Fastest ES5 implementation.
  3. ## Install
  4. Install with [npm](https://www.npmjs.com/):
  5. ```sh
  6. $ npm install --save array-unique
  7. ```
  8. ## Usage
  9. ```js
  10. var unique = require('array-unique');
  11. var arr = ['a', 'b', 'c', 'c'];
  12. console.log(unique(arr)) //=> ['a', 'b', 'c']
  13. console.log(arr) //=> ['a', 'b', 'c']
  14. /* The above modifies the input array. To prevent that at a slight performance cost: */
  15. var unique = require("array-unique").immutable;
  16. var arr = ['a', 'b', 'c', 'c'];
  17. console.log(unique(arr)) //=> ['a', 'b', 'c']
  18. console.log(arr) //=> ['a', 'b', 'c', 'c']
  19. ```
  20. ## About
  21. ### Related projects
  22. * [arr-diff](https://www.npmjs.com/package/arr-diff): Returns an array with only the unique values from the first array, by excluding all… [more](https://github.com/jonschlinkert/arr-diff) | [homepage](https://github.com/jonschlinkert/arr-diff "Returns an array with only the unique values from the first array, by excluding all values from additional arrays using strict equality for comparisons.")
  23. * [arr-flatten](https://www.npmjs.com/package/arr-flatten): Recursively flatten an array or arrays. This is the fastest implementation of array flatten. | [homepage](https://github.com/jonschlinkert/arr-flatten "Recursively flatten an array or arrays. This is the fastest implementation of array flatten.")
  24. * [arr-map](https://www.npmjs.com/package/arr-map): Faster, node.js focused alternative to JavaScript's native array map. | [homepage](https://github.com/jonschlinkert/arr-map "Faster, node.js focused alternative to JavaScript's native array map.")
  25. * [arr-pluck](https://www.npmjs.com/package/arr-pluck): Retrieves the value of a specified property from all elements in the collection. | [homepage](https://github.com/jonschlinkert/arr-pluck "Retrieves the value of a specified property from all elements in the collection.")
  26. * [arr-reduce](https://www.npmjs.com/package/arr-reduce): Fast array reduce that also loops over sparse elements. | [homepage](https://github.com/jonschlinkert/arr-reduce "Fast array reduce that also loops over sparse elements.")
  27. * [arr-union](https://www.npmjs.com/package/arr-union): Combines a list of arrays, returning a single array with unique values, using strict equality… [more](https://github.com/jonschlinkert/arr-union) | [homepage](https://github.com/jonschlinkert/arr-union "Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.")
  28. ### Contributing
  29. Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
  30. ### Building docs
  31. _(This document was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme) (a [verb](https://github.com/verbose/verb) generator), please don't edit the readme directly. Any changes to the readme must be made in [.verb.md](.verb.md).)_
  32. To generate the readme and API documentation with [verb](https://github.com/verbose/verb):
  33. ```sh
  34. $ npm install -g verb verb-generate-readme && verb
  35. ```
  36. ### Running tests
  37. Install dev dependencies:
  38. ```sh
  39. $ npm install -d && npm test
  40. ```
  41. ### Author
  42. **Jon Schlinkert**
  43. * [github/jonschlinkert](https://github.com/jonschlinkert)
  44. * [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
  45. ### License
  46. Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
  47. Released under the [MIT license](https://github.com/jonschlinkert/array-unique/blob/master/LICENSE).
  48. ***
  49. _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.1.28, on July 31, 2016._