class Object

  # Is self included in other?
  #
  #   5.in?(0..10)       #=> true
  #   5.in?([0,1,2,3])   #=> false
  #
  def in?(other)
    other.include?(self)
  end

end


#  _____         _
# |_   _|__  ___| |_
#   | |/ _ \/ __| __|
#   | |  __/\__ \ |_
#   |_|\___||___/\__|
#
=begin test

  require 'test/unit'

  class TCKernel < Test::Unit::TestCase

    def test_in?
      assert( 5.in?(0..10) )
      assert( 5.in?([1,2,3,4,5]) )
    end

  end

=end