[JS] Universal animation function

index.js

// https://gist.github.com/gre/1650294
const easeOutCubic = t => (--t) * t * t + 1;

function animate (obj, prop, from, to, duration, ease) {
    if (!obj) return;
    const delta = to - from;
    const start = Date.now();
    const end = start + duration;
    const interval = setInterval(() => {
        const timeDelta = Date.now() - start;
        if (timeDelta >= duration) return clearInterval(interval);
        obj[prop] = from + delta * ease(timeDelta / duration);
    }, 10);
}

// Example:
let object = {
    set intVal (value) { console.log(value); }
};
animate(object, 'intVal', 400, -400, 500, easeOutCubic);