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iOS Developer Interview Questions

What are result builders and when are they used in Swift?

Suggested approach: This is an advanced question, so take your time. Start with a basic definition: result builders allow us to create a new value step by step by passing in a sequence of our choosing.

Next, follow up with a specific example – I’d suggest that SwiftUI is the easiest one here, because when we have a VStack with a variety of views inside Swift silently groups them together into an internal TupleView type so that they can be stored as a single child of the VStack – it turns a sequence of views into a single view.

  Estimated difficulty: Advanced

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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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