Swift comparing Strings optionals vs non-optional

Question

When comparing strings in Swift, you can compare non-optional strings with optional strings.

Like so (text is an optional, and it is empty):

UITextF         


        

Answer 1

For every Equatable type the == operation is also defined for optionals:

public func ==(lhs: T?, rhs: T?) -> Bool

The non-optional on the right side gets automatically promoted to an optional.

The == for optionals returns true when both values are nil or if they are both non-nil and they are equal.