array-mapcat

array-mapcat

Curried function deriving new array values by applying provided function to each item/index of provided array then applying concat to the results. Fast and compatible with modern or old browsers.

npm install array-mapcat --save

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

npm stats

Overview

• This is similar to doing [].concat.apply([], [].map()) but in a more functional and compositionally friendly way.
• Optionally, a dot-notation formatted string may be provided for item property access.

API Example

Basic

var mapcat = require('array-mapcat')
var splitword = (sentance) => sentance.split(/\s+/)
var sentences = [ 'two birds', 'three green peas' ]

mapcat(splitword, sentences)
//=> ['two', 'birds', 'three', 'green', 'peas']

Dot-notation object access

var mapcat = require('array-mapcat')
var listmodel = [
  { list: [1, 2, 3] },
  { list: [4, 5, 6] },
  { list: [7, 8, 9] }
]

mapcat('list', listmodel)
//=> [1, 2, 3, 4, 5, 6, 7, 8, 9]

Pointfree Style

var mapcat = require('array-mapcat')
var listmodel = Promise.resolve([
  { list: [1, 2, 3] },
  { list: [4, 5, 6] },
  { list: [7, 8, 9] }
])

listmodel.then(mapcat('list'))
//=> [1, 2, 3, 4, 5, 6, 7, 8, 9]

API

mapcat(fn, list)

arguments

• fn (Function|String) Function to apply to each item.
• list (array) Array to iterate over.

returns

• (array) Array resulting from applying provided function fn to each item of list then applying concat to the results.

Inspiration

• mapcat
• concatMap
• flat_map

Alternatives

• concat-map

Contributing

SEE: contributing.md

Licenses