Package Exports

es6-map
es6-map/implement
es6-map/is-implemented
es6-map/is-map
es6-map/lib/iterator-kinds
es6-map/polyfill
es6-map/primitive
es6-map/valid-map

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (es6-map) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

es6-map

Map collection as specified in ECMAScript6

Warning:
v0.1 version does not ensure O(1) algorithm complexity (but O(n)). This shortcoming will be addressed in v1.0

Usage

It’s safest to use es6-map as a ponyfill – a polyfill which doesn’t touch global objects:

var Map = require('es6-map');

If you want to make sure your environment implements Map globally, do:

require('es6-map/implement');

If you strictly want to use the polyfill even if the native Map exists, do:

var Map = require('es6-map/polyfill');

Installation

$ npm install es6-map

To port it to Browser or any other (non CJS) environment, use your favorite CJS bundler. No favorite yet? Try: Browserify, Webmake or Webpack

API

Best is to refer to specification. Still if you want quick look, follow examples:

var Map = require('es6-map');

var x = {}, y = {}, map = new Map([['raz', 'one'], ['dwa', 'two'], [x, y]]);

map.size;                 // 3
map.get('raz');           // 'one'
map.get(x);               // y
map.has('raz');           // true
map.has(x);               // true
map.has('foo');           // false
map.set('trzy', 'three'); // map
map.size                  // 4
map.get('trzy');          // 'three'
map.has('trzy');          // true
map.has('dwa');           // true
map.delete('dwa');        // true
map.size;                 // 3

map.forEach(function (value, key) {
  // { 'raz', 'one' }, { x, y }, { 'trzy', 'three' } iterated
});

// FF nightly only:
for (value of map) {
 // ['raz', 'one'], [x, y], ['trzy', 'three'] iterated
}

var iterator = map.values();

iterator.next(); // { done: false, value: 'one' }
iterator.next(); // { done: false, value: y }
iterator.next(); // { done: false, value: 'three' }
iterator.next(); // { done: true, value: undefined }

map.clear(); // undefined
map.size; // 0

Tests

$ npm test