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Showing content from https://www.npmjs.com/package/collections-es6 below:

collections-es6 - npm

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

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

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

"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)); 
console.log(map.has("Hi")); 
 
map.set(NaN, "NaN");
map.set(NaN, "Again NaN!");
map.set(0, "Zero");
map.set(-0, "Again Zero!");
 
console.log(map.size); 
console.log(map.has(NaN)); 
console.log(map.size); 
console.log(map.has(0)); 
console.log(map.has(-0)); 
 
var set = new Set([NaN, 0, -0, "Hi", "Hello World"]);
set.add(Infinity);
 
console.log(set.has(NaN)); 
console.log(set.has("Hi")); 
console.log(set.size); 
console.log(set.has(Infinity)); 
console.log(set.has(-Infinity)); 
 
var wm = new WeakMap();
wm.set(Object, "object");
wm.set(Function, "function");
wm.set({}, "new Object");
 
console.log(wm.has(Object)); 
console.log(wm.has({})); 
 
var ws = new WeakSet();
ws.add(Function);
ws.add({});
 
console.log(ws.has({})); 
console.log(ws.has(Function)); 
 
console.log(ES6.isMap(map)); 
console.log(ES6.isSet(set)); 
console.log(ES6.isWeakMap(wm)); 
console.log(ES6.isWeakSet(ws)); 

Your PRs and stars are always welcome.

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