iOS Developer Interview Questions
What is the difference between the Float, Double, and CGFloat data types?
Suggested approach: It’s a question of how many bits are used to store data: Float is always 32-bit, Double is always 64-bit, and CGFloat is either 32-bit or 64-bit depending on the device it runs on, but realistically it’s just 64-bit all the time.
For bonus points, talk about how Swift 5.5 and onwards allows us to use CGFloat and Double interchangeably.
Estimated difficulty: Easy
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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 for job interviews, I wrote the perfect book for you: Swift Interview Challenges.
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