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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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