From: Robert Klemme <shortcutter@...>
Date: 2007-06-10T19:35:02+09:00
Subject: fun with "case"


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