gistfile1.js

var index;

function log(){
  console.log(index);
}

function iterate(){
  log();
  if(index>1) setTimeout(iterate, 1000);
  index--;
}

function countdown(){
  index = 10;
  iterate();
}


countdown = (function() {
  var wadus = ["index", "iterate", "countdown", "log"];
  for(var i = 0; i < wadus.length; i++) {
    eval("var "+wadus[i]+" = "+window[wadus[i]]+";");
    eval("window[\""+wadus[i]+"\"] = undefined;");
  }
  return countdown;
})();
countdown();