Explain Swift memory, value semantics, and GCD
Company: Snapchat
Role: Software Engineer
Category: Software Engineering Fundamentals
Difficulty: hard
Interview Round: Onsite
Overview: This question evaluates a candidate's understanding of Swift memory management, value versus reference semantics, copy-on-write behavior, ARC stack vs heap distinctions, ownership qualifiers (weak vs unowned), and Grand Central Dispatch concurrency and execution order.
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