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iOS Developer Interview Questions

When would you use Swift’s Result type?

Suggested approach: Start with a brief introduction to what Result does, saying that it’s an enum encapsulating success and failure, both with associated values so you can attach extra information. I would then dive into the “when would you use it” part of the question – talking about asynchronous code is your best bet, particularly in comparison to how things like URLSession would often pass both a value and an error even when only one should exist at a time.

If you’d like to go into more detail, more benefits of Result include being able to send the result of a function around as value to be handled at a later date, and also the ability to handle typed errors.

  Estimated difficulty: Intermediate

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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.

Related questions

See the full list of iOS interview questions

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