Aliases for JS methods

alias.js

function $(a,b) {
  if (b === undefined)
    return document.querySelector(a);
  return a.querySelector(b);
}

function $$(a,b) {
  if (b === undefined)
    return document.querySelectorAll(a);
  return a.querySelectorAll(b);
}

Aliases for querySelector and querySelectorAll. Example usage:

$$($('#links'), 'a').forEach(a => a.addEventListener('click', e => alert("Hello")))
// equivalent to
document.querySelector('#links').querySelectorAll('a').forEach(a => a.addEventListener('click', e => alert("Hello")))