Comments on: Ajaxian Featured Tutorial: Defining classes and inheritance using Prototype 1.60

By: Olmo Maldonado

Olmo Maldonado — Sat, 13 Oct 2007 16:39:51 +0000

@gonchuki: “it’s former child Mootools ;)” ?

That’s not particularly correct :P.

By: gonchuki

gonchuki — Fri, 12 Oct 2007 21:06:01 +0000

like Dan says, it was about time… yet once again Prototype is copying it’s former child Mootools ;)
First Events, then Classes and DOM builders… what else will they mimic?

By: Tim

Tim — Fri, 12 Oct 2007 11:49:35 +0000

Does anyone here know about Douglas Crockford’s ideas on “Parasitic Inheritance”? He explains it a little in some of those Yahoo! video’s, great stuff. I use this concept throughout my own framework and it is so easy to understand. Parasitic Inheritance allows me to make use of inheritance, private variables, overriding methods, etc. When fully applied, the code will have no (need for) mention of “prototype”, “new” or “this”. I wander what others here think of Parasitic Inheritance.

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By: molasses

molasses — Fri, 12 Oct 2007 03:52:37 +0000

Why don’t the various Javascript library developers (Prototype, Ext, jQuery, Dojo, etc) work together and create a common OOP module that all the libraries can use?

By: Bashar Abdul

Bashar Abdul — Thu, 11 Oct 2007 21:50:49 +0000

The tutorial mentions a new syntax for Class.create which is new Class(). However this doesn’t seem to work, I get an error: Class is not a constructor.

By: Andrew Dupont

Andrew Dupont — Thu, 11 Oct 2007 21:09:35 +0000

Charles: your speculation is correct. Class#addMethods is a version of Object.extend that is mindful of inheritance. It means I can add methods to a class at any time and have the new method propagate to all instances of the class (naturally), but also to all subclasses and instances of subclasses. In other words, Class#addMethods handles the cascading that results from redefining a method in a class at the top of an inheritance chain.

By: Andrew Dupont

Andrew Dupont — Thu, 11 Oct 2007 21:09:35 +0000

By: Charles

Charles — Thu, 11 Oct 2007 20:43:12 +0000

Does Prototype’s Object.extend/Class.create (and I suppose Ext.extend) work like jQuery.extend? This looks like jQuery’s deep extend, but used in a class method. On that note, why the Class.create and .addMethods functions, instead of a single .extend? I guess so you can get superclass methods more easily? Hmm…

By: Dan

Dan — Thu, 11 Oct 2007 19:43:33 +0000

Its about time

By: Les

Les — Thu, 11 Oct 2007 18:07:09 +0000

… an update:
http://groups.google.com/group/prototype-core/browse_thread/thread/d8fb6fb5583479ee

By: Don Albrecht

Don Albrecht — Thu, 11 Oct 2007 17:46:14 +0000

This is an excellent tutorial, It helps me understand why so many developers are jumping to 1.6

By: Rich Waters

Rich Waters — Thu, 11 Oct 2007 15:51:16 +0000

Interesting, with the new changes it works almost exactly like Ext.extend

By: Les

Les — Thu, 11 Oct 2007 15:41:20 +0000

There have been some recent changes, see the changelog:

http://dev.rubyonrails.org/browser/spinoffs/prototype/trunk/CHANGELOG

“Class.create now takes a variable number of arguments: if the first argument is a class, the newly created class inherits from that class; all other arguments are treated as successive calls to addMethods.”