/usr/share/doc/node-arr-diff/README.md is in node-arr-diff 3.0.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | # arr-diff [](https://www.npmjs.com/package/arr-diff) [](https://npmjs.org/package/arr-diff) [](https://travis-ci.org/jonschlinkert/arr-diff)
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 install arr-diff --save
```
Install with [bower](http://bower.io/)
```sh
$ bower install arr-diff --save
```
## Usage
Returns the difference between the first array and additional arrays.
```js
var diff = require('arr-diff');
var a = ['a', 'b', 'c', 'd'];
var b = ['b', 'c'];
console.log(diff(a, b))
//=> ['a', 'd']
```
## Benchmarks
This library versus [array-differ](https://github.com/sindresorhus/array-differ), on May 07, 2016:
```
# benchmark/fixtures/long.js (94529 bytes)
current x 1,246 ops/sec ±0.98% (85 runs sampled)
array-differ x 993 ops/sec ±1.35% (87 runs sampled)
# benchmark/fixtures/med.js (708 bytes)
current x 583,612 ops/sec ±1.24% (87 runs sampled)
array-differ x 464,480 ops/sec ±1.42% (85 runs sampled)
# benchmark/fixtures/short.js (60 bytes)
current x 788,823 ops/sec ±0.95% (89 runs sampled)
array-differ x 521,483 ops/sec ±1.65% (86 runs sampled)
```
## Related projects
You might also be interested in these 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)
## 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).
## Building docs
Generate readme and API documentation with [verb](https://github.com/verbose/verb):
```sh
$ npm install verb && npm run docs
```
Or, if [verb](https://github.com/verbose/verb) is installed globally:
```sh
$ verb
```
## Running tests
Install dev dependencies:
```sh
$ npm install -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-diff/blob/master/LICENSE).
***
_This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on May 07, 2016._
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