|
|
# 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](https://ponyfill.com) – a polyfill which doesn’t touch global objects:
|
|
|
|
|
|
```javascript
|
|
|
var Map = require('es6-map');
|
|
|
```
|
|
|
|
|
|
If you want to make sure your environment implements `Map` globally, do:
|
|
|
|
|
|
```javascript
|
|
|
require('es6-map/implement');
|
|
|
```
|
|
|
|
|
|
If you strictly want to use the polyfill even if the native `Map` exists, do:
|
|
|
|
|
|
```javascript
|
|
|
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](http://browserify.org/), [Webmake](https://github.com/medikoo/modules-webmake) or [Webpack](http://webpack.github.io/)
|
|
|
|
|
|
#### API
|
|
|
|
|
|
Best is to refer to [specification](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-map-objects). Still if you want quick look, follow examples:
|
|
|
|
|
|
```javascript
|
|
|
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 [](https://travis-ci.org/medikoo/es6-map)
|
|
|
|
|
|
$ npm test
|
