sort-map

Sorts a Map by its keys and/or values.

Unlike Array.prototype.sort(), sort-map does not sort the Map in-place. It creates a new, sorted Map and returns it.

Installation

Requires Node.js 7.0.0 or above.

npm install sort-map --save

The module exports a single function.

Usage

Maps

By default, sort-map sorts a Map by its keys:

const sortMap = require('sort-map')
 
const map = new Map([['b', 2], ['a', 1]])
const sortedMap = sortMap(map)
Array.from(sortedMap.keys()) // ['a', 'b']

You can provide a callback if your sorting needs are more complex. This example sorts the Map by its values:

const compare = require('3')
const sortMap = require('sort-map')
 
const map = new Map([['b', 2], ['a', 1]])
const sortedMap = sortMap(map, ([k1, v1], [k2, v2]) => compare(v1, v2))
Array.from(sortedMap.values()) // [1, 2]

The above example makes use of the 3 module in the sort callback.

Objects

sort-map can also sort an Object (but remember that JavaScript technically does not guarantee that Object keys will be enumerated in any particular order).

const sortMap = require('sort-map')
sortMap({b: 2, a: 1}) // {a: 1, b: 2}