gistfile1.rb

# Method to provide some syntactic sugar to use a hash of options instead of normal
    # arguments, where you want an ArgumentError thrown if the proper keys aren't passed
    # in, but you want the syntactic sugar of hash keys.
    #
    # Example
    # =======
    # require_options!({ :name => "John Doe", :age => 24 }, :name, :age, :sex) 
    # # => raises an ArgumentError
    # 
    def require_options!(opts, *required_options)
      required_options.each do |required_option|
        raise(ArgumentError, "wrong number of arguments (#{opts.keys.size} for #{required_options.size})") unless opts.keys.include? required_option
      end
    end