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79 lines
2.2 KiB
79 lines
2.2 KiB
# es6-map |
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## Map collection as specified in ECMAScript6 |
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__Warning: |
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v0.1 version does not ensure O(1) algorithm complexity (but O(n)). This shortcoming will be addressed in v1.0__ |
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### Usage |
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It’s safest to use *es6-map* as a [ponyfill](https://ponyfill.com) – a polyfill which doesn’t touch global objects: |
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```javascript |
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var Map = require('es6-map'); |
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``` |
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If you want to make sure your environment implements `Map` globally, do: |
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```javascript |
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require('es6-map/implement'); |
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``` |
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If you strictly want to use the polyfill even if the native `Map` exists, do: |
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```javascript |
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var Map = require('es6-map/polyfill'); |
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``` |
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### Installation |
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$ npm install es6-map |
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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/) |
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#### API |
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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: |
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```javascript |
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var Map = require('es6-map'); |
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var x = {}, y = {}, map = new Map([['raz', 'one'], ['dwa', 'two'], [x, y]]); |
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map.size; // 3 |
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map.get('raz'); // 'one' |
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map.get(x); // y |
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map.has('raz'); // true |
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map.has(x); // true |
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map.has('foo'); // false |
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map.set('trzy', 'three'); // map |
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map.size // 4 |
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map.get('trzy'); // 'three' |
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map.has('trzy'); // true |
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map.has('dwa'); // true |
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map.delete('dwa'); // true |
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map.size; // 3 |
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map.forEach(function (value, key) { |
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// { 'raz', 'one' }, { x, y }, { 'trzy', 'three' } iterated |
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}); |
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// FF nightly only: |
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for (value of map) { |
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// ['raz', 'one'], [x, y], ['trzy', 'three'] iterated |
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} |
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var iterator = map.values(); |
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iterator.next(); // { done: false, value: 'one' } |
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iterator.next(); // { done: false, value: y } |
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iterator.next(); // { done: false, value: 'three' } |
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iterator.next(); // { done: true, value: undefined } |
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map.clear(); // undefined |
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map.size; // 0 |
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``` |
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## Tests [](https://travis-ci.org/medikoo/es6-map) |
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$ npm test
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