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iOS Developer Interview Questions

How would you explain key paths to a new Swift developer?

Suggested approach: Start with the simplest explanation you can, then try to follow up with practical examples.

For example, you might start by saying that key paths let us refer to a property in a type rather than the exact value of that property in one particular instance. You could then follow up with examples such as using the map() method with a key path, to convert an array of users into an array of strings containing just their names, or perhaps using filter() to filter an array based on which items have a Boolean property set to true. If you want to give an app-based example, perhaps talk about how SwiftUI uses key paths with List and ForEach to ensure items are uniquely identifiable.

  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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