Scroll right on scroll down left on scroll up Javascript

I’ve probably tested 30 different snippets of code. Yeah, yeah, I should probably understand what I’m actually doing first. But here’s the one that most reliably worked. Obviously, from css-tricks who writes it in jQuery. Below is the vanilla version with reliable flair.

function scrollHandler (event) {
    window.scrollBy({ left: event.deltaY })
window.addEventListener('scroll', event => scrollHandler(event), {passive: false})

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