Magic with &:symbol and &block

how.rb

class Translator
  def speak &language # Proc.new { |obj| obj.send(:method) }
    language.call(self) # self make obj so it convert to self.send(:method)
    # Proc.new { |obj| obj.send(method) } .call(self)
  end
 
  protected
 
  def french
    'bon jour'
  end
 
  def spanish
    'hola'
  end
 
  def turkey
    'gobble'
  end
 
  def method_missing *args
    'awkward silence'
  end
end


irb(main):002:0> translator = Translator.new
=> #
irb(main):003:0> translator.speak(&:spanish)
=> «hola»
irb(main):004:0> translator.speak(&:turkey)
=> «gobble»
irb(main):005:0> translator.speak(&:italian)
=> «awkward silence»

sym_proc.rb

class Symbol
  def to_proc
    Proc.new { |*args| args.shift.__send__(self, *args) }
  end
end

class Symbol
  def to_proc
    Proc.new { |obj| obj.send self }
  end
end