From: Gustav Paul <gustav@...>
Date: 2007-06-10T20:43:57+09:00
Subject: Re: fun with "case"

Robert Klemme wrote:
>
> A funny (and readable) way to test collection sizes just occurred to me:
>
> irb(main):001:0> class Integer
> irb(main):002:1>   def elements
> irb(main):003:2>     cond = lambda {|enum| self == enum.size}
> irb(main):004:2>     class <<cond
> irb(main):005:3>       alias :=== :call
> irb(main):006:3>     end
> irb(main):007:2>     cond
> irb(main):008:2>   end
> irb(main):009:1> end
> => nil
> irb(main):010:0> case [1,2,3]
> irb(main):011:1> when 3.elements
> irb(main):012:1>   puts "three!"
> irb(main):013:1> when 5.elements
> irb(main):014:1>   puts "too much!"
> irb(main):015:1> else
> irb(main):016:1*   puts "else"
> irb(main):017:1> end
> three!
> => nil
>
> :-)
>
> Kind regards
>
>     robert
>
>
lol, that's pretty sweet :-)

G