async

async.coffee

async = (queue, over)->
  next = ->
    step = queue.shift()
    if step
      step.apply(null, arguments.concat(next))
    else
      over and over()
  next()

async.es6

var async = (queue, over)=>{
  var next = (...args)=>{
    let step = queue.shift();
    if(step){
      let arg = args.concat(next);
      step.apply(null, arg)
    }else{
      over()
    }
  };
  next()
};

async.js

var async = function(queue, over){
  var next = function(){
    var step = queue.shift();
    if(step){
      step.apply(null, arguments.concat(next));
    }else{
      over && over();
    }
    
  }
  
}

whilist.es6

var whilist = (judgeFn, task, finishAll)=>{
  if(!judgeFn()){return finishAll();}
  task(()=> whilist(judgeFn, task, finishAll))
};