Bootleg way for Async Iterators

class AsyncIterator {
    iterations = 0;
    constructor(processor, iterations, callback) {
        this.processor = processor;
        this.callback = callback;
        this.maxIterations = iterations;
        this.tick();
    }

    async tick() {
        return new Promise((s, f) => {
            setTimeout(() => {
                this.processor(this.iterations);
                s();
            })

        }).then(() => {
            if (this.iterations < this.maxIterations) {
                this.iterations++;
                this.tick();

            } else {
                this.callback()
            }
        })
    }
}

const iTest = new AsyncIterator(i => {
    document.write(i + '<br>');
}, 100, () => {
    console.log('Done');
})