Comments on: Javascript Foundation

By: C

Wed, 14 Dec 2011 20:17:45 +0000

Thank you for these introductions, they’re very helpful.

By: probonogeek

probonogeek — Mon, 02 Mar 2009 17:07:09 +0000

@Animal
Ah, that’s good to know. I hadn’t really thought of that before, but it makes sense that Array is a kind of object.

I’ve never really tried to use for…in on an object with methods before, but I suppose you would have to deal with attached methods. Guess that’s yet another reason to have typeof handy.

Thanks for the comment Animal… you will probably see some of your own suggestions and comments from the forums discussed here in coming posts on ExtJS.

By: Animal

Animal — Mon, 02 Mar 2009 16:11:54 +0000

Just a small small point.

An Array is a specialized object.

{} is an object. It may have items indexed by strings (But you MAY use integers)

[] is an Array. It may have items indexed by integers. (But being an OO language it is also an object). You can “poke” named properties into it.

This is important if you ever use for…in to traverse the properties of an object.

If you based that object on an Array, you’ll get Array’s methods popping up!