From: "Brian Schröder" <ruby.brian@...>
Date: 2005-08-13T01:12:08+09:00
Subject: Re: Array redefinition problem

> It's a web script, so I never noticed this warning in a class below the
> array redef:
>  warning: redefining Object#initialize may cause infinite loop
> 
> I had a "begin" in there that was unmatched, and a rescue several
> functions later -
> which was causing some real strange things.
> 
> Anyway, now that I have put the begin in the same function as the rescue,
> I no longer get the error. But I still can't redefine Array - now I get:
> 
> /var/www/ruby/core.rb:22:in `num_rows': undefined local variable or
> method `length' for #<#<Module:0xb65fcfec>::Array:0xb65e2c78> (NameError)
> 
> The first lines of the program are:
> class ::Array
>   def num_rows
>     return length <--- LINE 22
>   end
> end
> 
> a = Array.new
> puts a.num_rows
> 
> -- so how do I access ::Array.length?

class Array
  alias :num_rows :length 
end

[1,2,3].num_rows #=> 3

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