Object Reference

[mentalist]

Hi,

 

I have a class object which needs to draw itself to a canvas and it needs to know which image to draw from. There are various ways I could do this, but... If when I create the object I pass the image to it, is that a copy of that image or just a reference to it?

 

 

Here's a simplified scenario for example:

 

var tileSheet=new Image();tileSheet.src="myImg.png";...var o = new dyn_char();

Should I then do this:

o.img = tileSheet;o.draw();

or this:

o.draw(img);

Which is the more memory efficient way?

[kicken]

In JS, everything except the basic types (string, bool, number) are passed as references. There is no significant difference between the two options you presented.

[Andy-H]

I would use the

 

 

o.draw(img);

 

example, simply because the interface doesn't limit you to only drawing one image to your 'tileSheet', i.e. you may in future need to draw 4 images.

 

As for memory footprint, I would assume no to little difference as the same amount of objects are created in the same scope.