Useless stuff to help me remember some ES6 concepts

es6_object_iter.js

'use strict';

const Foo = (() => {
    const params = new WeakMap();

    class Foo {
        constructor(bar, baz) {
            params.set(this, {
                'barKey': bar,
                'bazKey': baz
            });
        }

        [Symbol.iterator]() {
            return (function* (o) {
                for (let k of Object.keys(o)) {
                    yield [k, o[k]];
                }
            })(params.get(this));
        }
    }

    return Foo;
})();

const foo1 = new Foo({1: 'bar1'}, {2: 'baz2'});
const foo2 = new Foo({3: 'bar3'}, {4: 'baz4'});

for (let [k, v] of [...foo1, ...foo2]) {
   console.log(k, v);
}