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- # arr-diff [![NPM version](https://img.shields.io/npm/v/arr-diff.svg?style=flat)](https://www.npmjs.com/package/arr-diff) [![NPM monthly downloads](https://img.shields.io/npm/dm/arr-diff.svg?style=flat)](https://npmjs.org/package/arr-diff) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/arr-diff.svg?style=flat&label=Travis)](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 --save arr-diff
- ```
-
- Install with [yarn](https://yarnpkg.com):
-
- ```sh
- $ yarn add arr-diff
- ```
-
- Install with [bower](https://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 April 14, 2017:
-
- ```
- Benchmarking: (4 of 4)
- · long-dupes
- · long
- · med
- · short
-
- # benchmark/fixtures/long-dupes.js (100804 bytes)
- arr-diff-3.0.0 x 822 ops/sec ±0.67% (86 runs sampled)
- arr-diff-4.0.0 x 2,141 ops/sec ±0.42% (89 runs sampled)
- array-differ x 708 ops/sec ±0.70% (89 runs sampled)
-
- fastest is arr-diff-4.0.0
-
- # benchmark/fixtures/long.js (94529 bytes)
- arr-diff-3.0.0 x 882 ops/sec ±0.60% (87 runs sampled)
- arr-diff-4.0.0 x 2,329 ops/sec ±0.97% (83 runs sampled)
- array-differ x 769 ops/sec ±0.61% (90 runs sampled)
-
- fastest is arr-diff-4.0.0
-
- # benchmark/fixtures/med.js (708 bytes)
- arr-diff-3.0.0 x 856,150 ops/sec ±0.42% (89 runs sampled)
- arr-diff-4.0.0 x 4,665,249 ops/sec ±1.06% (89 runs sampled)
- array-differ x 653,888 ops/sec ±1.02% (86 runs sampled)
-
- fastest is arr-diff-4.0.0
-
- # benchmark/fixtures/short.js (60 bytes)
- arr-diff-3.0.0 x 3,078,467 ops/sec ±0.77% (93 runs sampled)
- arr-diff-4.0.0 x 9,213,296 ops/sec ±0.65% (89 runs sampled)
- array-differ x 1,337,051 ops/sec ±0.91% (92 runs sampled)
-
- fastest is arr-diff-4.0.0
- ```
-
- ## About
-
- ### 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 "Recursively flatten an array or arrays. This is the fastest implementation of array flatten.")
- * [array-filter](https://www.npmjs.com/package/array-filter): Array#filter for older browsers. | [homepage](https://github.com/juliangruber/array-filter "Array#filter for older browsers.")
- * [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://github.com/jonschlinkert/array-intersection) | [homepage](https://github.com/jonschlinkert/array-intersection "Return an array with the unique values present in _all_ given arrays using strict equality for comparisons.")
-
- ### Contributing
-
- Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
-
- ### Contributors
-
- | **Commits** | **Contributor** |
- | --- | --- |
- | 33 | [jonschlinkert](https://github.com/jonschlinkert) |
- | 2 | [paulmillr](https://github.com/paulmillr) |
-
- ### Building docs
-
- _(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
-
- To generate the readme, run the following command:
-
- ```sh
- $ npm install -g verbose/verb#dev verb-generate-readme && verb
- ```
-
- ### Running tests
-
- Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
-
- ```sh
- $ npm install && npm test
- ```
-
- ### Author
-
- **Jon Schlinkert**
-
- * [github/jonschlinkert](https://github.com/jonschlinkert)
- * [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
-
- ### License
-
- Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
- Released under the [MIT License](LICENSE).
-
- ***
-
- _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 14, 2017._
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