Swift Functional Programming - Second Edition

Tuples

Swift provides tuples so that they can be used to group multiple values/types into a single compound value. Consider the following example:

let http400Error = (400, "Bad Request") // http400Error is of type (Int, String), and equals (400, "Bad Request") // Decompose a Tuple's content let (requestStatusCode, requestStatusMessage) = http400Error 

Tuples can be used as return types in functions to implement multi-return functions as well.