Returning "this" when the function performs a setTimeout.

[slobad23]

I have a function that was taken from Nicholas Zakas named "Chunk". When it does it take an array, a function to invoke on each item of the array and a callback to run when complete.

//array: the array of items on which to iterate. 
//process: a function which takes a single item (from the array).
//callback: function to carry out when all array items processed. 
//config: {object}
//  time: milliseconds for timeout period (default: 50). 
//  context: object on which to invoke "process" (default: null/global).
function chunk(array, process, callback, config) {
  //Create local copy of array. We will be altering this through .shift()
  //and don't want to alter the array parameter directly. 
  var items = array.concat();
  //Provide defaults for config object in case it has not been passed
  //or certain values don't exist on the object. 
  var time = config.time ? config.time : 50;
  var context = config.context ? config.context : null;
  
  var that = this;
  //Initial call to snippet which will process a single item from the array. 
  setTimeout(function snippet() {
    //Get first item from the queue. 
    var item = items.shift();
    //Invoke the process function on the context provided (or default).
    process.call(context, item);
    //If there are any more items, queue up the process for the next item.
    if (items.length)
      setTimeout(snippet, time)
      //When complete, invoke the callback function provided. 
    else {
      callback();
	}
  }, time);
}

What I would like to do, it to be able to chain another method to the end after the callback to avoid pyramid code.

Rather than:

chunk(a,
function() {},
function() {
chunk(a,
function() {},
function() {},
{});
},
{});

I would like to do this:

chunk(....).chunk(....).chunk(....);

I can't do this as it invokes the second and third immediately due to the setTimeouts in the chunk function. What I would really like to do is return this only when the setTimeout has completed all it's work. Any ideas on this?

"It doesn't do anything"

"Correction, it DOES nothing