class Dog {
var name = ""
var whatADogSays = "woof"
func bark() {
	print(self.whatADogSays)
	}
}

// you can omit the word self here

class Dog {
var name = ""
var whatADogSays = "woof"
func bark() {
	print(whatADogSays)
	}
	func speak() {
		bark()
	}
}

// reason is that if you omit the message recipient and the message you’re sending can be sent to self, the compiler supplies self as the message’s recipient under the hood.
// it is best not to do that as matter of style
// it is best to be explicit