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- # arr-union [](https://www.npmjs.com/package/arr-union) [](https://travis-ci.org/jonschlinkert/arr-union)
- > Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.
- ## Install
- Install with [npm](https://www.npmjs.com/):
- ```sh
- $ npm i arr-union --save
- ```
- ## Benchmarks
- This library is **10-20 times faster** and more performant than [array-union](https://github.com/sindresorhus/array-union).
- See the [benchmarks](./benchmark).
- ```sh
- #1: five-arrays
- array-union x 511,121 ops/sec ±0.80% (96 runs sampled)
- arr-union x 5,716,039 ops/sec ±0.86% (93 runs sampled)
- #2: ten-arrays
- array-union x 245,196 ops/sec ±0.69% (94 runs sampled)
- arr-union x 1,850,786 ops/sec ±0.84% (97 runs sampled)
- #3: two-arrays
- array-union x 563,869 ops/sec ±0.97% (94 runs sampled)
- arr-union x 9,602,852 ops/sec ±0.87% (92 runs sampled)
- ```
- ## Usage
- ```js
- var union = require('arr-union');
- union(['a'], ['b', 'c'], ['d', 'e', 'f']);
- //=> ['a', 'b', 'c', 'd', 'e', 'f']
- ```
- Returns only unique elements:
- ```js
- union(['a', 'a'], ['b', 'c']);
- //=> ['a', 'b', 'c']
- ```
- ## Related projects
- * [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://www.npmjs.com/package/arr-diff) | [homepage](https://github.com/jonschlinkert/arr-diff)
- * [arr-filter](https://www.npmjs.com/package/arr-filter): Faster alternative to javascript's native filter method. | [homepage](https://github.com/jonschlinkert/arr-filter)
- * [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)
- * [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)
- * [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)
- * [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)
- * [array-unique](https://www.npmjs.com/package/array-unique): Return an array free of duplicate values. Fastest ES5 implementation. | [homepage](https://github.com/jonschlinkert/array-unique)
- ## Contributing
- Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/arr-union/issues/new).
- ## Building docs
- Generate readme and API documentation with [verb](https://github.com/verbose/verb):
- ```sh
- $ npm i verb && npm run docs
- ```
- Or, if [verb](https://github.com/verbose/verb) is installed globally:
- ```sh
- $ verb
- ```
- ## Running tests
- Install dev dependencies:
- ```sh
- $ npm i -d && npm test
- ```
- ## Author
- **Jon Schlinkert**
- * [github/jonschlinkert](https://github.com/jonschlinkert)
- * [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
- ## License
- Copyright © 2016 [Jon Schlinkert](https://github.com/jonschlinkert)
- Released under the [MIT license](https://github.com/jonschlinkert/arr-union/blob/master/LICENSE).
- ***
- _This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on February 23, 2016._
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