Package Exports
- es6-weak-map
- es6-weak-map/implement
- es6-weak-map/is-native-implemented
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-weak-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-weak-map
WeakMap collection as specified in ECMAScript6
Roughly inspired by Mark Miller's and Kris Kowal's WeakMap implementation.
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-mapTo port it to Browser or any other (non CJS) environment, use your favorite CJS bundler. No favorite yet? Try: Browserify, Webmake or Webpack
Usage
If you want to make sure your environment implements WeakMap, do:
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:
var WeakMap = require("es6-weak-map");If you strictly want to use polyfill even if native WeakMap exists, do:
var WeakMap = require("es6-weak-map/polyfill");API
Best is to refer to specification. Still if you want quick look, follow example:
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); // falseTests
$ npm test