How do I avoid dynamic dispatch where unnecessary in Swift?

In Swift, dynamic dispatch is the mechanism by which method calls are resolved at runtime rather than at compile time. While this provides flexibility and support for polymorphism, it can have performance implications. To avoid dynamic dispatch where unnecessary in Swift, you can use the following strategies:

  • Use Final Classes and Methods: Mark classes with the `final` keyword and methods with `final`. This tells the compiler that the class or method cannot be subclassed or overridden, allowing for static dispatch.
  • Use Structs: Swift structs are value types and are not subject to dynamic dispatch. Using structs when it makes sense can help improve performance.
  • Use Protocols with Static Dispatch: Using protocol as a constraint for generic functions can lead to static dispatch if the associated types are resolved at compile-time.

By applying these techniques, you can optimize performance and reduce the overhead of dynamic dispatch in your Swift code.


Swift Dynamic Dispatch Performance Optimization Final Classes Structs Protocols