// For API, goto: https://github.com/ysmood/yaku#observableexecutor

​

let Promise = Yaku;

let { Observable, never } = Yaku;

​

let singleClick = new Observable(next => btn.onclick = next);

​

let doubleClick = singleClick.subscribe(debounceClick());

​

singleClick.subscribe(count(display01));

​

doubleClick.subscribe(count(display02));

​

// ************* Common Helpers **************

​

function count (elem) {

    return () => elem.innerText += " + ";

}

​

function debounceClick () {

    let last = new Date();

    return () => {

        let now = new Date();

        if (now - last > 300) {

            last = now;

            return never();

        } else {

            last = 0;

        }

    };

}

​