modules/enumerable.rb

   1 class Void; end
   2
   3 module Enumerable
   4         ## a shortcut for map {...}
   5         ##  [10, 20, 30].all + 5           => [15, 25, 35]
   6         ##  [10, 20, 30].map { |x| x + 5 } => [15, 25, 35]
   7         ##  %w(hello you).all.upcase       => ["HELLO", "YOU"]
   8
   9         def all
  10                 Mapper.new(self)
  11         end
  12
  13         ## This class is used in Enumerable#all
  14         class Mapper < Void
  15                 def initialize(obj)
  16                         @obj = obj
  17                 end
  18                 def method_missing(*args)
  19                         @obj.map do |item|
  20                                 item.send(*args)
  21                         end
  22                 end
  23         end
  24 end
  25