How to trap double key press in javascript?

Question

I would like to be able to trap the double key press (for the Char T for example) in order to do some special processing.I would like the key presses to happen fast enough t

Answer 1

I know is too late to answer but here goes how I have implemented that:

let pressed;
let lastPressed;
let isDoublePress;

const handleDoublePresss = key => {
    console.log(key.key, 'pressed two times');
}

const timeOut = () => setTimeout(() => isDoublePress = false, 500);

const keyPress = key => {
    pressed = key.keyCode;

    if (isDoublePress && pressed === lastPressed) {
        isDoublePress = false;
        handleDoublePresss(key);
    } else {
        isDoublePress = true;
        timeOut();
    }

    lastPressed = pressed;
}

window.onkeyup = key => keyPress(key);