Priceline IOS Developer Interview Questions and Answers

Failable initialisers are initialisers that can return nil instead of an instance of the class.

• Failable initialisers are denoted by placing a question mark after the init keyword.

• They are commonly used to handle invalid input or to fail gracefully.

• Example: init?(name: String) { if name.isEmpty { return nil } }

• Failable initialisers can be used with optional binding to safely unwrap the returned instance.