| [6a3a178] | 1 | # arr-diff [](https://www.npmjs.com/package/arr-diff) [](https://npmjs.org/package/arr-diff) [](https://travis-ci.org/jonschlinkert/arr-diff)
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| 2 |
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| 3 | > Returns an array with only the unique values from the first array, by excluding all values from additional arrays using strict equality for comparisons.
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| 4 |
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| 5 | ## Install
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| 6 |
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| 7 | Install with [npm](https://www.npmjs.com/):
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| 8 |
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| 9 | ```sh
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| 10 | $ npm install --save arr-diff
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| 11 | ```
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| 12 |
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| 13 | Install with [yarn](https://yarnpkg.com):
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| 14 |
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| 15 | ```sh
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| 16 | $ yarn add arr-diff
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| 17 | ```
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| 18 |
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| 19 | Install with [bower](https://bower.io/)
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| 20 |
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| 21 | ```sh
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| 22 | $ bower install arr-diff --save
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| 23 | ```
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| 24 |
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| 25 | ## Usage
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| 26 |
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| 27 | Returns the difference between the first array and additional arrays.
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| 28 |
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| 29 | ```js
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| 30 | var diff = require('arr-diff');
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| 31 |
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| 32 | var a = ['a', 'b', 'c', 'd'];
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| 33 | var b = ['b', 'c'];
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| 34 |
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| 35 | console.log(diff(a, b))
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| 36 | //=> ['a', 'd']
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| 37 | ```
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| 38 |
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| 39 | ## Benchmarks
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| 40 |
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| 41 | This library versus [array-differ](https://github.com/sindresorhus/array-differ), on April 14, 2017:
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| 42 |
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| 43 | ```
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| 44 | Benchmarking: (4 of 4)
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| 45 | · long-dupes
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| 46 | · long
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| 47 | · med
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| 48 | · short
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| 49 |
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| 50 | # benchmark/fixtures/long-dupes.js (100804 bytes)
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| 51 | arr-diff-3.0.0 x 822 ops/sec ±0.67% (86 runs sampled)
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| 52 | arr-diff-4.0.0 x 2,141 ops/sec ±0.42% (89 runs sampled)
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| 53 | array-differ x 708 ops/sec ±0.70% (89 runs sampled)
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| 54 |
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| 55 | fastest is arr-diff-4.0.0
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| 56 |
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| 57 | # benchmark/fixtures/long.js (94529 bytes)
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| 58 | arr-diff-3.0.0 x 882 ops/sec ±0.60% (87 runs sampled)
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| 59 | arr-diff-4.0.0 x 2,329 ops/sec ±0.97% (83 runs sampled)
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| 60 | array-differ x 769 ops/sec ±0.61% (90 runs sampled)
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| 61 |
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| 62 | fastest is arr-diff-4.0.0
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| 63 |
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| 64 | # benchmark/fixtures/med.js (708 bytes)
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| 65 | arr-diff-3.0.0 x 856,150 ops/sec ±0.42% (89 runs sampled)
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| 66 | arr-diff-4.0.0 x 4,665,249 ops/sec ±1.06% (89 runs sampled)
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| 67 | array-differ x 653,888 ops/sec ±1.02% (86 runs sampled)
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| 68 |
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| 69 | fastest is arr-diff-4.0.0
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| 70 |
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| 71 | # benchmark/fixtures/short.js (60 bytes)
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| 72 | arr-diff-3.0.0 x 3,078,467 ops/sec ±0.77% (93 runs sampled)
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| 73 | arr-diff-4.0.0 x 9,213,296 ops/sec ±0.65% (89 runs sampled)
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| 74 | array-differ x 1,337,051 ops/sec ±0.91% (92 runs sampled)
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| 75 |
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| 76 | fastest is arr-diff-4.0.0
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| 77 | ```
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| 78 |
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| 79 | ## About
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| 80 |
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| 81 | ### Related projects
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| 82 |
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| 83 | * [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.")
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| 84 | * [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.")
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| 85 | * [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.")
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| 86 |
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| 87 | ### Contributing
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| 88 |
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| 89 | Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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| 90 |
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| 91 | ### Contributors
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| 92 |
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| 93 | | **Commits** | **Contributor** |
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| 94 | | --- | --- |
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| 95 | | 33 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 96 | | 2 | [paulmillr](https://github.com/paulmillr) |
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| 97 |
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| 98 | ### Building docs
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| 99 |
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| 100 | _(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.)_
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| 101 |
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| 102 | To generate the readme, run the following command:
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| 103 |
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| 104 | ```sh
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| 105 | $ npm install -g verbose/verb#dev verb-generate-readme && verb
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| 106 | ```
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| 107 |
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| 108 | ### Running tests
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| 109 |
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| 110 | 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:
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| 111 |
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| 112 | ```sh
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| 113 | $ npm install && npm test
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| 114 | ```
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| 115 |
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| 116 | ### Author
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| 117 |
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| 118 | **Jon Schlinkert**
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| 119 |
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| 120 | * [github/jonschlinkert](https://github.com/jonschlinkert)
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| 121 | * [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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| 122 |
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| 123 | ### License
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| 124 |
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| 125 | Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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| 126 | Released under the [MIT License](LICENSE).
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| 127 |
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| 128 | ***
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| 129 |
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| 130 | _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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