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# arr-diff [](https://www.npmjs.com/package/arr-diff) [](https://travis-ci.org/jonschlinkert/base)
> Returns an array with only the unique values from the first array, by excluding all values from additional arrays using strict equality for comparisons.
## Install
Install with [npm](https://www.npmjs.com/)
```sh
$ npm i arr-diff --save
```
Install with [bower](http://bower.io/)
```sh
$ bower install arr-diff --save
```
## API
### [diff](index.js#L33)
Return the difference between the first array and additional arrays.
**Params**
* `a` **{Array}**
* `b` **{Array}**
* `returns` **{Array}**
**Example**
```js
var diff = require('arr-diff');
var a = ['a', 'b', 'c', 'd'];
var b = ['b', 'c'];
console.log(diff(a, b))
//=> ['a', 'd']
```
## Related projects
* [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)
* [array-filter](https://www.npmjs.com/package/array-filter): Array#filter for older browsers. | [homepage](https://github.com/juliangruber/array-filter)
* [array-intersection](https://www.npmjs.com/package/array-intersection): Return an array with the unique values present in _all_ given arrays using strict equality… [more](https://www.npmjs.com/package/array-intersection) | [homepage](https://github.com/jonschlinkert/array-intersection)
## Running tests
Install dev dependencies:
```sh
$ npm i -d && npm test
```
## Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/arr-diff/issues/new).
## Author
**Jon Schlinkert**
+ [github/jonschlinkert](https://github.com/jonschlinkert)
+ [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
## License
Copyright © 2015 [Jon Schlinkert](https://github.com/jonschlinkert)
Released under the MIT license.
***
_This file was generated by [verb](https://github.com/verbose/verb) on Sat Dec 05 2015 23:24:53 GMT-0500 (EST)._
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