private_vs_protected.md

protected methods can be called by all inherited classes, private methods can only be called by the class they're in.

In ruby, self.some_protected_method works, self.some_private_method doesn't work.

Here are examples

class Y
  def send_private;
    self.private_method_x
  end
  def send_protected;
    self.protected_method_x
  end
  
private
  def private_method_x; puts "hi I am private"; end

protected
  def protected_method_x; puts 'hi i am protected'; end
end

y = Y.new

y.send_private
NoMethodError: private method `private_method_x' called for #<Y:0x007f7febb99b38>
  from (irb):3:in `a'
	from (irb):11

y.send_protected
hi i am protected
=> nil