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iOS Developer Interview Questions

When would you use the guard keyword in Swift?

Suggested approach: It’s most commonly used to check preconditions are satisfied, but you should also discuss how variables it creates remain in scope after the guard block, and also how it enforces you exit the scope if the precondition fails.

For bonus points, mention that you can use guard inside any kind of block as long as you escape afterwards – you can use it inside a loop for example.

  Estimated difficulty: Easy

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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