What's up with optionals?

Optionals are declared with a question mark after the typeOptionals are allowed to hold no valueAn optional is nil by defaultAn optional is 0 by default

Nice! Optionals are declared with a question mark after the type. Unlike normal variables, they can be nil, which is also their default value.

Not quite! Optionals are declared with a question mark after the type. Unlike normal variables, they can be nil, which is also their default value.