From: Yasushi Shoji <yashi@...>
Date: 2000-09-26T12:50:17+09:00
Subject: [ruby-talk:5126] Re: Types and ===

From: "Hal E. Fulton" <hal9000@hypermetrics.com>
Subject: [ruby-talk:5122] Re: Types and ===
Date: Tue, 26 Sep 2000 11:47:49 +0900

> But to ask the question, "Which of these strings matches this pattern?" I
> cannot
> do this:
> 
> case /pattern/
>   when str1
>       stmt1
>   when str2
>       stmt2
>   ...
> end

you *can* do this, sort of, using case. but, IMHO, i don't know i'd
use it.

IMHO, a problem usually solved by using case statement itself is not
commutative?

usually, we want string to match one regex and do the statement
assosiated to, but don't we want to know all of the string that mutchs
given regex?

in that case, case is not well suited. use if.
--
        yashi

class String
  alias_method '_===', '==='

  def ===(other)
    case other
    when Regexp
      other === self
    else
      _===(other)
    end
  end
end

case /[ab]o/
when 'abc'
  p 1
when 'abo'
  p 2
when 'ao'
  p 3
end