create closure

closure.js

(function(countdown, container){

  var index;
  
  function log(){
    console.log(index);
  }
  
  function iterate(){
    log();
    if(index>1) setTimeout(iterate, 1000);
    index--;
  }
  
  container[countdown] = function(){
    index = 10;
    iterate();
  }

})('countdown', this);