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+# es6-weak-map
+## WeakMap collection as specified in ECMAScript6
+
+_Roughly inspired by Mark Miller's and Kris Kowal's [WeakMap implementation](https://github.com/drses/weak-map)_.
+
+Differences are:
+- Assumes compliant ES5 environment (no weird ES3 workarounds or hacks)
+- Well modularized CJS style
+- Based on one solution.
+
+### Limitations
+
+- Will fail on non extensible objects provided as keys
+
+### Installation
+
+	$ npm install es6-weak-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/)
+
+### Usage
+
+If you want to make sure your environment implements `WeakMap`, do:
+
+```javascript
+require('es6-weak-map/implement');
+```
+
+If you'd like to use native version when it exists and fallback to polyfill if it doesn't, but without implementing `WeakMap` on global scope, do:
+
+```javascript
+var WeakMap = require('es6-weak-map');
+```
+
+If you strictly want to use polyfill even if native `WeakMap` exists, do:
+
+```javascript
+var WeakMap = require('es6-weak-map/polyfill');
+```
+
+#### API
+
+Best is to refer to [specification](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-weakmap-objects). Still if you want quick look, follow example:
+
+```javascript
+var WeakMap = require('es6-weak-map');
+
+var map = new WeakMap();
+var obj = {};
+
+map.set(obj, 'foo'); // map
+map.get(obj);        // 'foo'
+map.has(obj);        // true
+map.delete(obj);     // true
+map.get(obj);        // undefined
+map.has(obj);        // false
+map.set(obj, 'bar'); // map
+map.has(obj);        // false
+```
+
+## Tests [![Build Status](https://travis-ci.org/medikoo/es6-weak-map.svg)](https://travis-ci.org/medikoo/es6-weak-map)
+
+	$ npm test