Chunked Executions Need "setImmediate" and "Promise"

async-chunk-queued.js

// async version of timedChunk plus queued by robin
function asyncChunkQueued(items, process, context, callback) {
  var todo = items.concat(),   //create a clone of the original
    i = 0,  // index counter
    dfd = $.Deferred(),
    routine = function () {
      process.call(context, todo.shift(), i++)
      .then(function () {
        if (todo.length > 0) {
          _setImmediate(routine);
        }
        else {
          if (typeof callback !== 'undefined') {
            callback(items);    
          }
          dfd.resolve(items);
        }
      });
    };

  _setImmediate(routine);
  return dfd.promise();
}

timed-chunk.js

//Copyright 2009 Nicholas C. Zakas. All rights reserved.
//MIT Licensed
// modified by robin
function timedChunk(items, process, context, callback) {
  var todo = items.concat(),   //create a clone of the original
    i = 0,  // index counter
    dfd = $.Deferred();

  _setImmediate(function () {
    var start = +new Date();

    do {
      process.call(context, todo.shift(), i++);
    } while (todo.length > 0 && (+new Date() - start < 50));

    if (todo.length > 0){
      _setImmediate(arguments.callee);
    } else {
      if (typeof callback !== 'undefined') {
        callback(items);    
      }
      dfd.resolve(items);
    }
  });
  return dfd.promise();
}