Two small extensions to `Symbol`.

symbol.rb

class Symbol
  def [](*args)
    proc do |object|
      object.send self, *args
    end
  end

  def ~
    proc do |object, *args|
      object.send self, *args
    end
  end
end

p [1,2,3].map &:+[4]
# => [5, 6, 7]

p [[1,1],[2,2],[3,3]].map &~:+
# => [2, 4, 6]

p [[1,1],[1,2],[3,3]].select &~:==
# => [[1,1], [3,3]]