ruby_map.rb

#Subclassing Array instead of including Enumerable

class Core < Array

   attr_reader :name

   def initialize( name, data )
      @name  = name
      self[0..-1] = data
   end
end

require 'pp'

a = Core.new( 'dave', [1,2,3,4] )
puts a.name
pp a
puts

a.each do |x|
   puts x.to_s
end
puts
pp a

a.map! do |element|
   element = element * 2
end

pp a