The 5 W’s of Swift Extensions

This article provides a high-level introduction to Swift extensions, explained through the framework of the 5 W's: Who, What, When, Where, and Why. It targets Swift developers who want to add functionality to existing types from Apple frameworks, third-party libraries, or their own frameworks without modifying original source code. The article covers scenarios where extensions are useful, such as enhancing types from Cocoa Touch or third-party frameworks, and discusses when to use them for reusable, clean, and organized code. It emphasizes the power of extending types even without access to original source code, making it a valuable guide for iOS/macOS developers seeking to improve code modularity and reusability.