Apple coding interview prep
Team-specific loops with a strong bias toward practical problem-solving.
What the loop actually looks like
Apple's process varies more by team than most companies — the same title can mean very different loops. Coding questions are usually reasonable in difficulty, with extra weight on how carefully you handle edge cases and how well you understand the systems you've actually built.
What they reward
- Careful edge-case handling over clever tricks
- Depth on your own past projects
- Arrays, strings, and hashing fundamentals
- Team-specific domain knowledge
Patterns to drill first
Problems worth your time
In priority order. Open one to read the approach, or generate an interactive lesson and watch it run.
Two SumStore what you've seen so each element only looks up its complement.
Easy
Valid AnagramTwo strings are anagrams iff their character counts match.Easy
Best Time to Buy and Sell StockTrack the cheapest price so far and the best profit against it.Easy
Binary SearchHalve the range each step by comparing to the middle.Easy
Maximum SubarrayExtend the running sum, or restart at the current element — whichever is larger.Medium
Merge IntervalsSort by start, then merge any interval that overlaps the last one kept.Medium
Contains DuplicateA set answers 'have I seen this before?' in O(1).Easy
3SumFix one number, then two-pointer the rest for its negation.Medium
Tips specific to this loop
- — Ask which team you're interviewing with and tailor accordingly — the variance is real.
- — Be ready to go deep on anything on your résumé; surface-level answers get probed hard.
- — Enumerate edge cases explicitly before coding; it's weighted more heavily here.
Drill these with interactive lessons
Generate a step-by-step lesson for any problem above — trace every variable and watch the pattern move until it clicks.
Start a free lessonPrepping for other companies
Our own editorial read on this loop, based on publicly reported experiences — not leaked or current question banks.