Generic code enables you to write flexible, reusable functions and types that can work with any type, subject to requirements that you define. You can write code that avoids duplication and expresses its intent in a clear, abstracted manner.
Generics are one of the most powerful features of Swift, and much of the Swift standard library is built with generic code. For example, Swift's
Dictionarytypes are both generic collections. You can create an array that holds
Intvalues, or an array that holds
Stringvalues, or indeed an array for any other type that can be created in Swift. Similarly, you can create a dictionary to store values of any specified type, and there are no limitations on what that type can be.