Provides support for ES6 Map, Set, WeakMap and WeakSet in ES5 for older JS environments i.e. older browsers or NodeJS.

ES6 Map, Set, WeakMap and WeakSet polyfill in pure ES5.

It depends on symbol-es6 module, so you need to include both.

Install it from npm and require it before any other modules:

$ npm install --save collections-es6

require("symbol-es6");
require("collections-es6");

If you prefer CDN, then just insert it into your HTML page on the top of other scripts:

<script src="https://cdn.jsdelivr.net/npm/symbol-es6/dist/symbol-es6.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/collections-es6/dist/collections-es6.min.js"></script>

"use strict";

var ES6 = require("symbol-es6");
ES6 = require("collections-es6");


var map = new Map([[1, 2], ["Hi", "Hello World"]]);

console.log(map.has(1)); //true
console.log(map.has("Hi")); //true

map.set(NaN, "NaN");
map.set(NaN, "Again NaN!");
map.set(0, "Zero");
map.set(-0, "Again Zero!");

console.log(map.size); //4
console.log(map.has(NaN)); //true
console.log(map.size); //4
console.log(map.has(0)); //true
console.log(map.has(-0)); //true

var set = new Set([NaN, 0, -0, "Hi", "Hello World"]);
set.add(Infinity);

console.log(set.has(NaN)); //true
console.log(set.has("Hi")); //true
console.log(set.size); //5
console.log(set.has(Infinity)); //true
console.log(set.has(-Infinity)); //false

var wm = new WeakMap();
wm.set(Object, "object");
wm.set(Function, "function");
wm.set({}, "new Object");

console.log(wm.has(Object)); //true
console.log(wm.has({})); //false

var ws = new WeakSet();
ws.add(Function);
ws.add({});

console.log(ws.has({})); //false
console.log(ws.has(Function)); //true

console.log(ES6.isMap(map)); //true
console.log(ES6.isSet(set)); //true
console.log(ES6.isWeakMap(wm)); //true
console.log(ES6.isWeakSet(ws)); //true

• Map

  • Map.prototype.size
  • Map.prototype.set()
  • Map.prototype.get()
  • Map.prototype.has()
  • Map.prototype.clear()
  • Map.prototype.delete()
  • Map.prototype.entries()
  • Map.prototype.forEach()
  • Map.prototype.keys()
  • Map.prototype.values()
  • Map.prototype[@@iterator]()
  • Map.prototype[@@toStringTag]()

• Set

  • Set.prototype.size
  • Set.prototype.add()
  • Set.prototype.clear()
  • Set.prototype.delete()
  • Set.prototype.entries()
  • Set.prototype.forEach()
  • Set.prototype.has()
  • Set.prototype.keys()
  • Set.prototype.values()
  • Set.prototype[@@iterator]()
  • Set.prototype[@@toStringTag]()

• WeakMap

  • WeakMap.prototype.delete()
  • WeakMap.prototype.get()
  • WeakMap.prototype.has()
  • WeakMap.prototype.set()
  • WeakMap.prototype[@@toStringTag]()

• WeakSet

  • WeakSet.prototype.add()
  • WeakSet.prototype.delete()
  • WeakSet.prototype.has()
  • WeakSet.prototype[@@toStringTag]()

Your PRs and stars are always welcome.

Please, try to follow:

• Clone the repository.
• Checkout develop branch.
• Install dependencies.
• Add your new features or fixes.
• Build the project.

$ git clone https://github.com/rousan/collections-es6.git
$ cd collections-es6
$ git checkout develop
$ npm i
$ npm run build