spickermann · February 25, 2014 01:31
diff --git a/negative-kernel-method.rb b/negative-kernel-method.rb
 class Foo
  def initialize(foo)
    @foo = foo
  end
  def foo
    @foo
  end
  def -@            # This is awesome
    Foo(-foo)
  end
 end

 def Foo(foo)
  Foo.new(foo)
 end

 puts Foo(5).foo     # => 5
 puts Foo(-5).foo    # => -5
 puts -Foo(5).foo    # => -5   (what is awesome)
	class Foo
	def initialize(foo)
	@foo = foo
	end
	def foo
	@foo
	end
	def -@ # This is awesome
	Foo(-foo)
	end
	end

	def Foo(foo)
	Foo.new(foo)
	end

	puts Foo(5).foo # => 5
	puts Foo(-5).foo # => -5
	puts -Foo(5).foo # => -5 (what is awesome)