In this tutorial, I’ll show you how researching and learning about the current programming language you’re using (i.e., Swift) can lead you to new discoveries, a better understanding of the language, and becoming a better problem solver. Recently, I ran into a Swift error that at first had me scratching my head. The error had to do with implicitly unwrapped optionals. My debugging and contemporaneous research led me to the little-known fact that, in Swift 4.2, a proposal “to remove the ImplicitlyUnwrappedOptional type from the Swift type system and replace it with an IUO attribute on declarations” was accepted and implemented. Despite the fact that I followed and covered language changes leading to Swift 4.2, I missed this seemingly innocuous but nonetheless prescient modification.
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Musings on iOS development, software design, testing, design patterns, and a few surprises…