sgflt - pastebin.com/drsKKm4n

gistfile1.txt

What I want: Load a number of images and fire a callback once all are loaded. The image objects of all images need to be available, this is *not* just for caching.

Example use:
var loader = new ImageLoader();
var img1 = loader.addImage('someurl');
var img2 = loader.addImage('anotherurl');
loader.beginLoading(function() {
	/* do something with the loaded images img1 and img2, which are Image objects
});

To do this in an OOP-way, I surely need to save the image-urls that are added to the loader using a list. I see only two ways to intialize the list: Inside the ImageLoader constructor or checking in addImage if it has been initialized yet, doing so if need be. The latter approach seems rather wasteful.

However, using the constructor method means that when trying to not use 'new', the Object.create()-way of creating the ImageLoader needs to explicitly call the constructor, which isn't elegant either.