From: Brian Candler <B.Candler@...>
Date: 2007-05-09T01:52:14+09:00
Subject: Re: Difference answers from Terminal, TextMate, and BBEdit

On Tue, May 08, 2007 at 11:47:28PM +0900, Morton Goldberg wrote:
> >On Tue, May 08, 2007 at 07:22:39PM +0900, Morton Goldberg wrote:
> >>A case statement like
> >>
> >><code>
> >>case
> >>when 'year' : tree.ageOneYear # , y as shortcut?
> >>when (1..100) : tree.pick_an_orange
> >>else puts('Don\'t be greedy, don\'t try to pick more than 100   
> >>oranges')
> >>end
> >></code>
> >>
> >>just looks for the first true when-clause. In this case that will
> >>always be 'year' because everything but false and nil is true in  
> >>Ruby.
> >
> >That's incorrect. Case doesn't check if 'year' is true; it checks  
> >whether
> >'year' === obj is true.
> >
> >Try this:
> >
> >foo = "Hello"
> >case foo
> >when "year"
> >  puts "xxx"
> >when /ell/
> >  puts "yyy"   # this line is run
> >end
> 
> Beg to differ with you. This is a case with no argument. It doesn't  
> have any obj to do a 'year' === obj on.

Ugh, you're right. It doesn't even compare against $_. 
That seems rather pointless, as it's just the same as if .. elsif .. end

And what about

  case
  when (1..100)
    # whatever
  end

That would be the flipflop operator borrowed from Perl? But with both ends
true as well?