namespace.rb

# ================
# Spell: Namespace
# ================

# Define constants within a module to avoid name clashes.

module MyNamespace
  class Array
    def to_s
      "my class"
    end
  end
end

Array.new # => []
MyNamespace::Array.new # => my class

# For more information: http://www.pragprog.com/titles/ppmetr/metaprogramming-ruby