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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:

$ npm install --save arr-diff

Install with yarn:

$ yarn add arr-diff

Install with bower

$ bower install arr-diff --save

Usage

Returns the difference between the first array and additional arrays.

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, 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: Recursively flatten an array or arrays. This is the fastest implementation of array flatten. | homepage
array-filter: Array#filter for older browsers. | homepage
array-intersection: Return an array with the unique values present in all given arrays using strict equality… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Contributors

| Commits | Contributor | | --- | --- | | 33 | jonschlinkert | | 2 | paulmillr |

Building docs

(This project’s readme.md is generated by verb, please don’t edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ 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:

$ npm install && npm test

Author

Jon Schlinkert

License

This file was generated by verb-generate-readme, v0.5.0, on April 14, 2017.

README.md