Vanilla JS (ES6) smooth scrolling w/ Easing functions

scroll.js

const scrollToItemId = (containerId, srollToId) => {
    const scrollContainer = document.getElementById(containerId);
    const item = document.getElementById(scrollToId);

    //with animation
    const from = scrollContainer.scrollTop;
    const by = item.offsetTop - scrollContainer.scrollTop;
    if (from < item.offsetTop) {
        if (item.offsetTop > scrollContainer.scrollHeight - scrollContainer.clientHeight) {
            by = (scrollContainer.scrollHeight - scrollContainer.clientHeight) - scrollContainer.scrollTop;
        }
    }
    const currentIteration = 0;
    /**
     * get total iterations
     * 60 -> requestAnimationFrame 60/second
     * second parameter -> time in seconds for the animation
     **/
    const animIterations = Math.round(60 * 0.5);

    (function scroll() {
        const value = easeOutCubic(currentIteration, from, by, animIterations);
        scrollContainer.scrollTop = value;
        currentIteration++;
        if (currentIteration < animIterations) {
            requestAnimationFrame(scroll);
        }
    })();
}

// TODO: Write easing class
const linearEase = (currentIteration, startValue, changeInValue, totalIterations) => {
    return changeInValue * currentIteration / totalIterations + startValue;
}
const easeOutCubic = (currentIteration, startValue, changeInValue, totalIterations) => {
    return changeInValue * (Math.pow(currentIteration / totalIterations - 1, 3) + 1) + startValue;
}

Couple of typos here and there; srollToId is missing a 'c' and assignments to constant variable