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iOS Developer Interview Questions

What are generics and why are they useful?

Suggested approach: Generics allow us to create types and functions that can be adapted to use different kinds of data for extra flexibility and safety.

Generics are most commonly used to add type safety to collections – even if you don't create them yourself much, you certainly use them because [String] is really Array<String> under the hood.

For bonus points, talk about how protocols use associated types rather than generics to achieve a similar result.

  Estimated difficulty: Intermediate

Important notes

  • There are over 150 interview questions in the system. Once you've read the question and come up with a suitable answer, try reading my suggested approach and see if it helps you add more detail.
  • These questions are not designed to be hard; a good interviewer is more interested in generating discussion that lets your ability and interests shine through.
  • If you answer a question with "yes" or "no" you've missed the point – interviewers prefer you to provide reasoning, explanation, or detail, so try to elaborate with examples!
  • If you're looking for detailed technical questions about the language, you should try my Swift tests instead – there are multiple challenges that will work your brain hard.
  • For a whole series of coding challenges, I wrote the perfect book for you: Swift Coding Challenges.

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