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iOS Developer Interview Questions

When would you use @autoclosure?

Suggested approach: There are a few ways you could tackle this, but I would recommend either talking about the && operator or the assert() function – something you use regularly, and so feel comfortable talking about in detail.

First, start with a simple definition: @autoclosure silently turns a function’s parameter into a closure so that it can be executed on demand rather than immediately. Now, pick a specific example such as assert() and explain why it’s used – the autoclosure behavior here ensures our assertion doesn’t happen in release mode, so it won’t have a performance impact when we ship apps to the App Store.

  Estimated difficulty: Advanced

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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