class Fruits {
    constructor() {
        this.items = [];
    }

    add(item) {
        this.items.push(item);
    }

    [Symbol.iterator]() {
        const elements = this.items;
        const total = (elements && elements.length) || 0;
        let i = -1;
        return {
            next() {
                i++;
                return {
                    value: elements && elements[i],
                    done: i >= total ? true : false
                }
            }
        }
    }
}

const fruits = new Fruits();
fruits.add({ name: 'Apple', count: 10 });
fruits.add({ name: 'Banana', count: 5 });

for (var f of fruits) {
    console.log(f);
}