He asked to be able to differentiate between "get more spaces" buttons (top vs. bottom) and do the same for the "create a lumo" buttons.

README.md

topbottom-original.js

function () {

  // charlie pretends he is a programmer
  var instructions = {
    'what button?': 'get more button', // possible values: 'create lumo button' or 'get more button'
    'which one?': 'top' //possible values: 'top' or 'bottom'
  };

  // ignore the rest here
  var config = {
    'get more button': {
      'selector': '.sd-btn[href="/plans"]'
    },
    'create lumo button': {
      'selector': '.sd-btn[href="#modal_create"]'
    },
    'top': function (nodelist) {
      return nodelist[0];
    },
    'bottom': function (nodelist) {
      return nodelist[nodelist.length-1];
    }
  };
  
  // lol this is dumb
  var elements = document.querySelectorAll(config[instructions['what button?']].selector) || {};
  return config[instructions['which one?']](elements);
}

topbottom-revised.js

function () {

  var config = {
    'selectors': [
      {
        "name": "getMore"
      , "selector": '.sd-btn[href="/plans"]'
      },
      {
        "name": "createLumo"
      , "selector": '.sd-btn[href="#modal_create"]'
      }
    ]
  };

  var elements = [];
  var found;
  for (var i = 0; i < config.selectors.length; i++) {
    found = Array.prototype.slice.call(document.querySelectorAll(config.selectors[i].selector));

    if(found[0]) {
      found[0].ascLocation = "top";
    }
    if(found[found.length-1]) {
      found[found.length-1].ascLocation = "bottom";
    }

    elements = elements.concat(found);
  }
  
  return elements;
}