arr-union

Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.

This library is 15-20 times faster and more performant (scales better) than array-union, which just uses [].concat.apply([], arguments).

Benchmarks

See the benchmarks.

#1: five-arrays.js
  array-union.js x 245,487 ops/sec ±0.99% (96 runs sampled)
  current.js x 5,267,661 ops/sec ±0.63% (98 runs sampled)

#2: ten-arrays.js
  array-union.js x 134,784 ops/sec ±0.51% (94 runs sampled)
  current.js x 1,919,143 ops/sec ±0.45% (100 runs sampled)

#3: two-arrays.js
  array-union.js x 308,374 ops/sec ±0.75% (96 runs sampled)
  current.js x 7,361,915 ops/sec ±0.67% (95 runs sampled)

Install

Install with npm

$ npm i arr-union --save

Usage

var union = require('arr-union');

union(['a'], ['b', 'c'], ['d', 'e', 'f']);
//=> ['a', 'b', 'c', 'd', 'e', 'f']

Returns only unique elements:

union(['a', 'a'], ['b', 'c']);
//=> ['a', 'b', 'c']

Other array utilities

arr-diff: Returns an array with only the unique values from the first array, by excluding all… more
arr-flatten: Recursively flatten an array or arrays. This is the fastest implementation of array flatten.
arr-filter: Faster alternative to javascript's native filter method.
arr-map: Faster, node.js focused alternative to JavaScript's native array map.
arr-pluck: Retrieves the value of a specified property from all elements in the collection.
arr-reduce: Fast array reduce that also loops over sparse elements.
array-unique: Return an array free of duplicate values. Fastest ES5 implementation.

Running tests

Install dev dependencies:

$ npm i -d && npm test

Contributing

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

Author

Jon Schlinkert

License

This file was generated by verb-cli on June 15, 2015.

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