iOS Developer Interview Questions
What is a UUID, and when might you use it?
Suggested approach: UUID stands for "universally unique identifier", which is a long string of hexadecimal numbers stored in a single type.
UUIDs are helpful for ensuring some value is guaranteed to be unique, for example you might need a unique filename when saving something.
For bonus points, perhaps explain why we call them universally unique – if you created 100 trillion UUIDs there's a one in a billion chance of generating a duplicate.
Estimated difficulty: Intermediate
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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.
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