Useful little ruby extension

with_args.rb

class Proc
  def with_args(*args, &block)
    proc do |obj|
      call(obj, *args, &block)
    end
  end
end

class Symbol
  def with_args(*args, &block)
    proc do |obj|
      obj.public_send(self, *args, &block)
    end
  end
end

if __FILE__ == $0
  p [34, 55, 13].map(&:to_s.with_args(32))

  case "foo"
  when :respond_to?.with_args(:to_s) # Because Proc implements ===
    puts "YES"
  else
    fail
  end
end