Old request animation frame code

request-animation-frame.js

function animationLoop(render, element) {
    const running, lastFrame = +new Date;
    function loop(now) {
        // stop the loop if render returned false
        if (running !== false) {
            requestAnimationFrame(loop, element);
            const deltaT = now - lastFrame;
            // do not render if deltaT is too high
            if ( deltaT < 160 ) {
                running = render(deltaT);
            }
            lastFrame = now;
        }
    }
    loop(lastFrame);
}