iOS Developer Interview Questions
What problem does optional chaining solve?
Suggested approach: Optional chaining makes our code concise because we can write multiple optional calls on one line but have execution skip over the line if any of the optionals are missing.
For bonus points, talk about this also works with things like try? and as?.
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
- Apart from the built-in ones, can you give an example of property wrappers?
- What does the nil coalescing operator do?
- What is the difference between an escaping closure and a non-escaping closure?
- How would you explain protocols to a new Swift developer?
- How would you explain operator overloading to a junior developer?
