Swift’s goal is to be safe enough for applications programming, fast enough for systems programming, interoperate seamlessly with Objective-C, productive enough for scripting and machine learning, and easy enough to teach to children. In the language designer’s own words, “World Domination.” But what’s the cost of these competing priorities?
In this talk, we’ll see how some of the most entertaining and interesting consequences of these conflicting priorities played out in Uber’s multi-million line Swift codebase: Objective-C interop went horribly wrong, a seemingly reasonable design failing because of seemingly arbitrary type system restrictions, and a harrowing example of a bug in the Swift type-checker becoming an integral part of an important library.
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