TamperMonkey/GreaseMonkey UserScript to add keyboard arrow navigation to Hackaday articles

hackaday-arrow-nav.user.js

// ==UserScript==
// @name	Hackaday Arrow Navigation
// @description	Adds keyboard arrow navigation to Hackaday articles
// @author	Gigawatts
// @version	1.0.0
// @homepage	https://gist.github.com/gigawatts/266b2ad2dd699c80a0c323424c39555f/
// @updateURL	https://gist.githubusercontent.com/raw/266b2ad2dd699c80a0c323424c39555f/hackaday-arrow-nav.user.js
// @downloadURL	https://gist.githubusercontent.com/raw/266b2ad2dd699c80a0c323424c39555f/hackaday-arrow-nav.user.js
// @match	*://hackaday.com/*

// ==/UserScript==

(function() {
  'use strict';

  // listen for keyUp events
  document.onkeyup = e => {
    switch(e.key) {
      case 'ArrowLeft':
        document.querySelector('a[rel=prev]').click();
        break;
      case 'ArrowRight':
        document.querySelector('a[rel=next]').click();
        break;
    }
  }
})()