Javascript Deferred implementation

Deferreds.js

function Deferred () {
  var rand = Math.random();
  
  var dones = [];
  var is_resolved = false;
  
  return {
    promise: function () {
    },
    resolve: function(str) {
      while (dones.length > 0) {
        var callback = dones.shift();
        //callback(str);
        callback.call(this, str);
      }
      is_resolved = true;
    }, 
    reject: function() {
    },
    done: function(callback) {
      dones.push(callback);
    }, 
    isResolved: function() {
      return is_resolved;
    }
  };
}


function When(/* d1, d2 */) {
  var dones = [],   //The list of callback we need to call when we are done
      deferreds = [],  //The list of deferreds we are still waiting to finish
      deferreds_copy = [], //A copy of the original deferreds TODO: remove this, it is only being use to return the arguments to done in the correct order
      returns = [];   //Our list of arguments that we will return when done
  
  for (var i = 0; i < arguments.length; i++) {
    if (arguments[i].done) {
      deferreds.push(arguments[i]);
      deferreds_copy.push(arguments[i]);
      arguments[i].done(function(data){ 
        removeDeferred(this, data);
      });
    }
  }

  function checkDone() {
    if (deferreds.length === 0) {
      allDone();
    }
  }
  
  function removeDeferred(d, data) {
    var index = deferreds.indexOf(d);
    if (index > -1) {
      deferreds.splice(index, 1);
    }
    
    index = deferreds_copy.indexOf(d);
    if (index > -1) {
      returns[index] = data;
    }
    checkDone();
  }
  
  function allDone() {
      while (dones.length > 0) {
        var callback = dones.shift();
        callback.apply(this, returns);
      }
  }
  
  return {
    done: function(callback) {
      dones.push(callback);
      checkDone();
    }
  };
}



function getData() {
  var deferred = Deferred();
  setTimeout(function() {
    console.log("timeOOUT");
    deferred.resolve("Here is some data");
  }, 3000);

  return deferred;
}

function getMoreData() {
  var deferred = Deferred();
  setTimeout(function() {
    console.log("timeOOUT Done sooner");
    deferred.resolve("Here is more data");
  }, 1000);

  return deferred;
}


var dataPromise = getData();

dataPromise.done(function(data) {
  console.log("dataPromise is done. data: " + data );
});

dataPromise.done(function(data) {
  console.log("dataPromise is done and lets have some fun! data: " + data);
});



function getLocation() {
    var deferred2 = Deferred();


  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(pos){
      console.log("We have position");
      deferred2.resolve(pos);
    });
  }
  return deferred2;
}

var locationPromise = getLocation();

locationPromise.done(function(data) {
  console.log("locationPromise is done - pos.lat: " + data.coords.latitude + " pos.long: " + data.coords.longitude);
});


var allDone = When(dataPromise, locationPromise, getMoreData());
allDone.done(function(a,b,c) {
  console.log("We loaded items");
  console.log("dataPromise: " + a);
  console.log("locationPromise: " + b);
  console.log("getMoreData: " + c);
});