class ArrayIterator<T> {
    private elements: T[];
    private index: number;
    constructor(el: T[]) {
        this.index = 0;
        this.elements = el;
    }

    next() {
        return this.elements[this.index++];
    }

    hasNext() {
        return this.index < this.elements.length;
    }
};

const collection = new ArrayIterator<string>(['Один', 'Два', 'Три'])

while(collection.hasNext()) {
    console.log(collection.next())
}