iOS Developer Interview Questions
How would you explain dependency injection to a junior developer?
Suggested approach: Dependency injection is the practice of creating an object and telling it what data it should work with, rather than letting that object query its environment to find that data for itself. Although this goes against the OOP principle of encapsulation, it’s worth talking about the advantages – it allows for mocking data when testing, for example.
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.
Related questions
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- What experience do you have of functional programming?
- How would you explain delegates to a new Swift developer?
- Can you explain KVO, and how it's used on Apple's platforms?
