forloop_rollyourown.js

function loop(init, fnCondition, fnUpdate, fnRun, fnDone){
  var index = 0;
  index = (init.constructor.name === "function")?init():init;
  function next(){
    index = fnUpdate(index);
    if(fnCondition(index)){
      setTimeout(function(){
        fnRun(index, next);
      }, 0);
    }else{
      if(fnDone) fnDone(index);
    }
  }
  fnRun(index,next);
}