next()
Advances to the next element and returns it, or nil if no next element exists.
Declaration
mutating func next() -> (key: Key, value: Value)?Discussion
Once nil has been returned, all subsequent calls return nil.
Advances to the next element and returns it, or nil if no next element exists.
mutating func next() -> (key: Key, value: Value)?Once nil has been returned, all subsequent calls return nil.