Async iterator for node js

asynciterator.js

class AsyncIterator {


    constructor(callback, endCallback, items) {
        this.currentItem = -1;
        this.items = items;
        this._callback = callback;
        this._endCallback = endCallback;
    }


    set callback(value) {
        this._callback = value;
    }

    nextItem() {
        if (this.currentItem+1 < this.items.length) {
            this.currentItem++;
            this._callback(this.items[this.currentItem]);
        } else {
            this._endCallback()
        }
    }


    set endCallback(value) {
        this._endCallback = value;
    }
}

module.exports = {
    AsyncIterator: AsyncIterator
}

Leave callback undefined, and define it after creating class, and do same to endCallback if you want.

When you've defined all callbacks, call nextItem() to start iteration. From your callback, to proceed to next item, call same function.