Iterate Over Parameter Packs in Swift 6.0

Parameter packs, introduced in Swift 5.9, make it possible to write generics that abstract over the number of arguments. This eliminates the need to have overloaded copies of the same generic function for one argument, two arguments, three arguments, and so on. With Swift 6.0, pack iteration makes it easier than ever to work with parameter packs. This post will show you how to make the best use of pack iteration.

→ swift.org/blog/pack-iteration/

Swift 6.0 introduces pack iteration, enhancing parameter packs from Swift 5.9 to simplify working with variable-length generic arguments.

Parameter packs allow functions to handle any number of types, eliminating the need for multiple overloads, as shown with a tuple equality operator that compares arbitrary-sized tuples. Pack iteration uses a for-in repeat syntax to iterate over value packs, enabling concise operations like checking tuple equality or array emptiness without complex workarounds like throwing errors.

Advanced use cases, such as filtering and processing Result values from a pack, are streamlined, making generics more intuitive and efficient for developers.