iOS Developer Interview Questions
What's the difference between a value type and a reference type?
Suggested approach: The best way to frame this discussion is likely to be classes vs structs: an instance of a class can have multiple owners, but an instance of a struct cannot.
For bonus points mention that closures are also reference types, and the implications of that.
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
-
What does the
Codableprotocol do? -
When using arrays, what’s the difference between
map()andcompactMap()? - What are the main differences between classes and structs in Swift?
-
What’s the importance of key decoding strategies when using
Codable? -
What is the difference between the
Float,Double, andCGFloatdata types?
