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iOS Developer Interview Questions

What is the difference between an array and a set?

Suggested approach: This is a bit like computer science 101, so start by answering with the facts: sets can’t contain duplicates and are unordered, so lookup is significantly faster. Note: this might sound like a trivial question, but the "significantly faster" part is critical – sets can be thousands of times faster than arrays depending on how many elements they contain. If you can, go on to give specific examples of where a set would be a better idea than an array.

  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.

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