In this episode, we migrate the Quiz project and its dependencies to Swift 4.2 and modernize our code with the newest additions.
One delightful change that Swift 4.2 brings is the improved ability of the compiler to synthesize an implementation of the
Hashable protocol. We take advantage of this change and, by following our standard workflow combining
Git and Automated Tests, we remove our custom implementation of
hashValue we wrote for the
Question type in Episode 13 - Improving the Game Flow with Swift Generics.
Hashable refactoring, we are surprised by some of the tests breaking. We resist the urge of deleting the tests by following a highly disciplined approach to solving the problem.
It’s important to notice that without a test suite we trust, it can be much harder to do such changes with confidence.
Finally, we take advantage of the new
Sequence.shuffled function that Swift 4.2 offers. We use
Sequence.shuffled to showcase how to test randomness by using probability rather than mocking. By not relying on mocking, we can freely change the implementation of our code without breaking any of the tests.
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