1cg

!function() {
  var doc     = document,
      htm     = doc.documentElement,
      lct     = null,   // last click target                                              
      nearest = function(elm, tag) {
        while (elm && elm.nodeName != tag) {
          elm = elm.parentNode;
        }
        return elm;
  };

1cg

function controlStuff(){
  var listOfThings = loadThings()
  for(thing in listOfThings.whereTypeIs(CanDoSomething)){
    thing.doSomething()
  }
}

// or just...

function controlStuff(){