Subj : Re: Implementing inheritence?
To   : netscape.public.mozilla.jseng
From : Brian Genisio <BrianGenisio@yahoo.com>
Date : Thu Jan 29 2004 08:40 am

Brendan Eich wrote:

> Brian Genisio wrote:
> 
>> Hi all,
>>
>> Is there a way in spidermonkey to have an object inherit all of a 
>> parent's properties and methods?
> 
> 
> 
> JS is all about delegation, not inheritance -- but the two look the same 
> from many angles.  If the first object O's prototype (__proto__ property 
> in SpiderMonkey) refers to the second, P (the "parent"), then for any 
> property X in P, O.X or O["X"] will access P.X or P["X"], unless there 
> is a direct property of O named X (in which case O.X is said to "shadow" 
> P.X).
> 
>> Using the DOM as an example, class Document inherits from class Node. 
>> Can I tell spidermonkey that this is the case, or do I have to 
>> implement it myself.  It looks pretty easy for me to do it myself, but 
>> I thought I would check if there is an easy way.  I couldnt find any.
> 
> 
> 
> If you are implementing the DOM, you might want to look at Mozilla's DOM 
> implementation.
> 
> /be

Ahhhh... So that is what the prototype is for!  Great.  That makes my 
life so much easier.  I was implementing what the prototype gives me, by 
registering  my class with the prototype's methods and props, and then 
defaulting to the prototypes's get and set methods if I didnt match 
anything.

I got the same effect using the prototype, but it was a _lot_ messier.

Thanks for the help.  There are a lot of details, such as this, that I 
am not finding clear explanation for directly in the document.  This 
newsgroup has been _GREAT_ at explaining the things that I have not 
found clear in the docs.

Thanks a bundle,
Brian

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