helma.org/wiki/JavaScript Inheritance Sugar

Version 4

hannes — Fri, 28 Jul 2006 11:33:00 +0000

* extending of priviledged methods is problematic. each constructor in the proto chain that gets called will create its own scope with its own private members and priviledged methods. Overriding priviledged methods will operate result in those methods operating on a entirely different set of private variables, leading very likely to unexpected results.

Version 3

hannes — Fri, 28 Jul 2006 09:00:10 +0000

5	* the this.base property is set before each method call, and reset to its previous value afterwards. This isn't very elegantelegant or efficient, and it doesn't deal with exceptions that might be thrown

Version 2

hannes — Fri, 28 Jul 2006 08:59:52 +0000

Set tags to javascript, inheritance, sugar

5	* the this.base property is set to the parent prototype's method before each method call, and reset to its previous value afterwards. This isn't very elegant, and it doesn't deal with exceptions that might be thrown

Version 1

hannes — Fri, 28 Jul 2006 08:55:49 +0000

1	A few days ago, I came across Dean Edward's Base Class for JavaScript Inheritance\|http://dean.edwards.name/weblog/2006/03/base/. I liked the general idea of adding syntactic sugar to JavaScript class-like inheritance. However, I think some things could be improved:
3	* the code of the Base class is pretty unreadable, because it tries to do too much in too little space
4	* methods in parent prototypes are called as this.base(), which looks nice but is far from self-explanatory and easily clashes with application methods or properties
5	* the this.base property is set to the parent prototype's method before each method call, and reset to its previous value afterwards. This isn't very elegant, and it doesn't deal with exceptions that might be thrown
6	* extending of priviledged methods is problematic. each constructor in the proto chain that gets called will create its own scope with its own private members and priviledged methods. Overriding priviledged methods will operate on a entirely different set of private variables.
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8	I'll describe my solution in an update to this page. For now, here's the code:
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10	<% this.attachments %>