es6-set

ECMAScript6 Set polyfill

es6-set

If you want to make sure your environment implements Set, do:

require('es6-set/implement');

If you'd like to use native version when it exists and fallback to polyfill if it doesn't, but without implementing Set on global scope, do:

var Set = require('es6-set');

If you strictly want to use polyfill even if native Set exists, do:

var Set = require('es6-set/polyfill');
$ npm install es6-set

To port it to Browser or any other (non CJS) environment, use your favorite CJS bundler. No favorite yet? Try: Browserify, Webmake or Webpack

Best is to refer to specification. Still if you want quick look, follow examples:

var Set = require('es6-set');
 
var set = new Set(['raz', 'dwa', {}]);
 
set.size;          // 3 
set.has('raz');    // true 
set.has('foo');    // false 
set.add('foo');    // set 
set.size           // 4 
set.has('foo');    // true 
set.has('dwa');    // true 
set.delete('dwa'); // true 
set.size;          // 3 
 
set.forEach(function (value) {
 // 'raz', {}, 'foo' iterated 
});
 
// FF nightly only: 
for (value of set) {
 // 'raz', {}, 'foo' iterated 
}
 
var iterator = set.values();
 
iterator.next(); // { done: false, value: 'raz' } 
iterator.next(); // { done: false, value: {} } 
iterator.next(); // { done: false, value: 'foo' } 
iterator.next(); // { done: true, value: undefined } 
 
set.clear(); // undefined 
set.size; // 0 

Tests

$ npm test