From: Joel Pearson <lists@...>
Date: 2013-02-04T22:32:55+09:00
Subject: Re: Select "columns" from multidimensional array?

>> class Excel_Sheet<Array
>
> I wouldn't do that.  With the basic types it is usually much better to
> use delegation (i.e. have a member of that type) than exposing the
> full API via inheritance.  The whole point of OO is to control
> internal state which is usually quite difficult when exposing a
> complete API of Array because anybody can insert and remove elements.
>
> Btw. the "self." in your code are superfluous.
>
> Kind regards
>
> robert

Ok, I wasn't sure how to create an object which behaved like an array.
I've tried this instead:

class Excel_Sheet

  def initialize( val=[] )
    val = %w(A1 A2 A3 B1 B2 B3 C1 C2 C3).each_slice(3).to_a if val == 
'test'
    fail ArgumentError, 'Must be multidimensional array' unless 
val[0].class == Array || val.empty?
    replace val
  end

end

It seems to work ok.

I didn't know how to use self at first, I think I understand it a bit 
better now.

Thanks for the advice :)

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