iOS Developer Interview Questions
What does it mean when we say “strings are collections in Swift”?
Suggested approach: This statement means that Swift’s String type conform to the Collection protocol, which allows us to loop over characters, count how long the string is, map the characters, select random characters, and more.
For bonus points, move on to talk about the Collection protocol itself – how it means we have a consistent way to work with strings, arrays, sets, and more.
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 is the difference between an array and a set?
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What’s the importance of key decoding strategies when using
Codable? -
What does the
Codableprotocol do? -
What is the difference between the
Float,Double, andCGFloatdata types? -
When using arrays, what’s the difference between
map()andcompactMap()?
