Swift version: 5.4
Never return type is a special one in Swift, and tells the compiler that execution will never return when this function is called. It’s used by Swift’s
preconditionFailure() functions, both of which cause your app to crash if they are called.
Never return type is useful because it lets Swift waive other requirements. For example, if you’re in a function that must return a value, calling a
Never function means you don’t need to return anything – Swift knows you can’t return a value any more.
SPONSORED Join a FREE crash course for iOS devs who want to become complete senior developers — from October 18th to 24th. Learn how to apply iOS app architecture patterns through a series of lectures and practical coding sessions.
Available from iOS 8.0 – learn more in my book Pro Swift
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.