From: Marnen Laibow-Koser <marnen@...>
Date: 2009-11-20T01:53:57+09:00
Subject: Re: dynamic array?

Robert Klemme wrote:
> 2009/11/19 Marnen Laibow-Koser <marnen@marnen.org>:
>>> => []
>>
>> �def []=(i, value)
>> �end
>> end
>>
>> ...and delegate everything else to self.to_a.
> 
> What are you trying to achieve with this?  As far as I can see you are
> mimicking Array behavior with a Hash.  So you have created a sparse
> array but not a two dimensional array - which was what the OP wanted
> if I understand him properly.

Right.  The idea was to create a sparse one-dimensional array for the 
major axis, then populate it with (sparse or not) one-dimensional arrays 
for the minor axis as necessary.  Perhaps I should have explained that 
in the first place. :)

I was trying to avoid the pitfall of your LazyM solution, which appears 
to use matrix[i, j] instead of matrix[i][j] to address a cell.  To my 
mind this violates POLS.


> 
> As a side note: I'd rather delegate to instead of inherit from Hash.
> The DynamicArray is not a Hash.  For example, method #size remains in
> the interface which might lead to surprises.

Probably not a bad idea.  This was seat-of-the-pants code. :)

> 
> Kind regards
> 
> robert

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org
-- 
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