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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

***

_This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on February 23, 2016._

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