Swift Functional Programming - Second Edition

isEmpty

Another common operation that LinkedList requires is a way to check whether it is empty. We can easily implement it in the following way:

var isEmpty: Bool {     switch self {     case .node(_ , _):         return false     case .end:         return true     } } 

To test this computed property, we will create an emptyLinkedList as follows:

let emptyLL = LinkedList<Int>.end print(emptyLL.isEmpty) print(functionalLinkedList.isEmpty) 

In the preceding example, the first print statement results in true and the second results in false.