ES6 Harmony Collections

This was a fork of es6-collections changed to work well under browserify. core-js (especially when used via Babel) has since better met my needs, so consider this module deprecated.

The aim of this repository is to provide an unobtrusive, performances oriented shim for ES6 collections such Map and Set for node.js and Browserify.

Collections using weak references such as WeakMap are not present as they can't always be efficiently or correctly implemented without native support.

These global functions are already available in Firefox Nightly and Chrome Dev channel through Enable Experimental JavaScript in chrome://flags/ section.

Features

• compatible with node.js, and both all browsers and Rhino through Browserify (npm install es6-unweak-collections).
• If native collections are present, they're returned instead rather than the shims.
• size and performances oriented polyfill.

Alternatives

• The original es6-collections project that this is based on.
• the bigger and rich in dependencies WeakMap shim from Mark S. Miller, the best attempt to avoid undesired memory leaks. Bear in mind some leak is still possible plus Object natives are wrapped plus it brings WeakMap only
• the unfortunately and so far slower and heavier, memory usage speaking, alternative from Benvie Harmony Collections Shim
• differently implemented Map and Set (no WeakMap) from Paul Millr, together with few others ES6 prototypes
• another attempt based on valueOf to avoid IE enumerability, still problematic with unknown objects but less leaks prone from Gozala

Tests

Just type $ mocha or $ npm test from the project’s folder in terminal.

License

es6-collections and the rest of the project is under Mit Style License

Copyright (C) 2011 by Andrea Giammarchi, @WebReflection

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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