Ruby Data Type Checking: Little metaprogramming fun

datatype_check.rb

##
# Provides functionality for checking if given object is of a specific data type.
# ---
# Currently supporting the following data types:
#   * Array
#   * String
#   * Integer
#
# = Example
#  users = ['jack', 'joe', 'john', 'anotherJname']
#  puts "This will happen, as it's true" if users.is_array?
#
#  str = "Hello world!"
#  puts "This too will happen" if str.is_string?
#
#  puts "Oh, and this is going to happen" if 10.is_int?
#
class Object
  @@typeConv = {
    :array    => 'Array',
    :string   => 'String',
    :int      => 'Integer'
  }

  def method_missing(method, *args, &block)
    if method.to_s =~ /is_(\w+)\?/ && @@typeConv[$1.to_sym]
      type = $1.to_sym
      is = false

      self.tap do |o|
        is = o.kind_of?(eval(@@typeConv[type]))
      end

      is
    else
      super
    end
  end
end