1  unless :to_proc.respond_to?(:to_proc)
   2    class Symbol
   3      # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:
   4      #
   5      #   # The same as people.collect { |p| p.name }
   6      #   people.collect(&:name)
   7      #
   8      #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
   9      #   people.select(&:manager?).collect(&:salary)
  10      def to_proc
  11        Proc.new { |*args| args.shift.__send__(self, *args) }
  12      end
  13    end
  14  end