Hi guys my name is Alexander, I'm fairly new to programming and I have a basic question regarding 

At 4:40 Bucky writes an if statement that only runs when introLabel != nil

And then he writes in that function "introLabel?. ... etc)"

Isn't that introLabel question-mark unnecessary since you only run that function if introLabel is not nil? Will it save work for the compiler if you drop out that question mark in a case like this?