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+# arr-union [![NPM version](https://img.shields.io/npm/v/arr-union.svg)](https://www.npmjs.com/package/arr-union) [![Build Status](https://img.shields.io/travis/jonschlinkert/arr-union.svg)](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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