#edge cases

5 edge cases interview questions, asked at Apple, Applied Intuition, Google and 2 more companies. Last asked Jul 2026.

Explain, fix and name an unfamiliar number-formatting functionCodingLockedThe interviewer pastes a short function with no name and no comments and asks what it does. Read it out loud, then answer the follow-ups: what is wrong with it, how you would fix…
Last asked Jul 2026
Compare dates by calendar monthCodingLockedDefine what it means for two dates to be within one calendar month of each other, exactly one month apart, or more than a month apart, and implement the comparison. "One month…
Last asked Jun 2026
Intersection of two line segmentsCodingGiven two line segments in the plane, AB and CD, by their endpoints, decide whether the closed segments intersect. As a follow-up, return where: the single point, or the…
Last asked Feb 2026
Poker hand checker with jokersCodingLockedWrite is_valid_hand(hand: list[str]) -> bool for a five-card poker game. Each card is a string "<rank> of <suit>".
Last asked Mar 2025
Valid date from three integers in any orderCodingYou are given three integers a, b and c. Their order is unknown: any one of them may be the year, the month or the day. This covers formats such as yyyy-MM-dd, MM-dd-yyyy and…