From: Dave Thomas <Dave@...>
Date: 2000-12-23T15:23:31+09:00
Subject: [ruby-talk:7995] Re: defined? problem?

Dave Thomas <Dave@PragmaticProgrammer.com> writes:

> Now if you want real testosterone-loaded statement modifiers, how
> about...

Or, as I just discovered, you can use statement modifiers on class and
method definitions. How about adding debugging to arrays if you
specify -d on the command line?

   class Array
     alias_method :old_access, :[]
     def [](*args)
       res = old_access(*args)
       puts "arr[#{args.join(', ')}] => #{res.to_a.join(', ')}"
       res
     end
   end if $DEBUG         # <<<<<

   a = [1,2,3,4]

   p a[3]
   p a[1..2]

=>

   arr[3] => 4
   4
   arr[1..2] => 2, 3
   [2, 3]


Now, can anyone find a use for tacking a 'while' modifier on to a
class or method definition?


Dave