Piotr Kowalski: New collections in JS: Map, Set, WeakMap, We

let map = new Map();
map.set({ foo: 1 }, 'a').set({ foo: 2 }, 'b')
let iterator = map.values();
let i = 0;
let interval2 = setInterval(() => {
    map.set(i,'dziala');
    console.log('interval2','++')
    i++;
}, 1000)
let interval1 = setInterval(() => {
    let item = iterator.next()
    if (item.done) {
        clearInterval(interval1)
        clearInterval(interval2)
        return
    }
    console.log('interval1',item.value)
}, 10000)