Mig N. Mig N. - 1 month ago 18
Swift Question

Swift Variable Declaration and Initialize

Is there a difference between how following bits of code work?

let x: Int = 4


and

let x: Int
x = 4

Answer

This one:

let x: Int = 4

creates a non-optional variable x and initialises it to 4. x can be used without issue.

This one:

let x: Int
// Cannot do anything with x yet
x = 4

creates a non-optional variable x with no defined value. It cannot be used without first assigning it to a value, either directly (as in your example) or by the result of some other statement. If you do try and use it, you'll get a compile-time error.