yayquery.js - All you really need

yayquery.js

export const $$ = (selector) => document.querySelector(selector);
export const $ = (selector) => document.querySelectorAll(selector);

// Apply a side effect to `n` items.
export const sets = (f, n, ...rest) => {
  for (var i = 0; i < n.length; i++) f(n[i], ...rest);
}

export const toggleClass = (el, classname, isAdding) =>
  isAdding ? el.classList.add(classname) : el.classList.remove(classname);