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iOS Developer Interview Questions

What experience do you have of functional programming?

Suggested approach: The best answer of course is to provide detailed explanations of what you've used and where, but as you go make sure and talk about what functional programming means – functions must be first-class types, you place an emphasis on pure functions, and so on.

If you’re not sure where to start, the easiest answer is to list some small specifics: if you’ve used map(), compactMap(), flatMap(), reduce(), filter() and so on, that’s a good place to begin.

  Estimated difficulty: Intermediate

See the full list of iOS interview questions

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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