array-groupby

array-groupby

Curried function that returns a map (object) with keys derived by applying each array element to the given identity function. The value(s) at each key will be an array of elements whose identity matches the given key.

npm install array-groupby --save

You can also use Duo, Bower or download the files manually.

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API Example

Dot-notation object access

var groupBy = require('array-groupby')
var strings = [ 'two', 'birds', 'three', 'green', 'peas' ]

groupBy('length', strings)
//=> { '3': [ 'two' ], '4': [ 'peas' ], '5': [ 'birds', 'three', 'green' ] }

Pointfree Style

var groupBy = require('array-groupby')
var strings = Promise.resolve([ 'two', 'birds', 'three', 'green', 'peas' ])
var charAt0 = string => string[0]

strings.then(groupBy(charAt0))
//=> { t: [ 'two', 'three' ], b: [ 'birds' ], g: [ 'green' ], p: [ 'peas' ] }

API

groupBy(fn, list)

arguments

• fn (Function|String) Function to apply to each element.
• list (array) Array to evaluate.

returns

• (Object) Object with keys derived by applying each array element to the given identity function.

Contributing

SEE: contributing.md

Licenses