From: Robert Klemme <shortcutter@...>
Date: 2010-11-27T00:26:22+09:00
Subject: Re: Newbie: two cool discoveries

On Fri, Nov 26, 2010 at 3:00 PM, Diego Virasoro
<diego.virasoro@gmail.com> wrote:
> I find the case statement particularly elegant: especially when
> there's a long list of choices I much prefer it to using if...
> elsif... else... end. That said the latter offers a lot more
> flexibility.

I'm curios to hear whether you maintain that statement after seeing
the other (apparently mostly unknown) variant of case:

case # nothing here!
when x > 1
  puts "great"
when sun.shines && temp > 20
  puts "warm"
when 3 == 9, 21 < 17
  puts "weird"
else
  puts "what?"
end

This is basically the same as an if-elsif-else-end cascade with a
shorter syntax for "||" (i.e. the comma after "when").

Also, you can return values from case statements:

puts case # nothing here!
when x > 1
  "great"
when sun.shines && temp > 20
  "warm"
when 3 == 9, 21 < 17
  "weird"
else
  "what?"
end

Of course this can also be done with if-elsif-else-end.

Cheers

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/