let clicks = 0;

const timeBetweenClicks = [];

const prevClickTimestamp = [];

​

const clickHandler = () => {

    const currentTime = Date.now();

    const previousClickTime = prevClickTimestamp.length ? prevClickTimestamp[prevClickTimestamp.length - 1] : currentTime;

    timeBetweenClicks.push(currentTime - previousClickTime);

    // save current time stamp to calculate time difference the next time button is clicked

    prevClickTimestamp.push(currentTime);

    clicks += 1;

​

    if (clicks === 3) {

        alert("3 clicks reached. Time between clicks: " + timeBetweenClicks);

        // remove event listener

        $('button').off('click', clickHandler);

    }

};

$('button').click(clickHandler);