Value Types vs Reference Types in Swift | Stack, Heap & Memory — iOS Interview
Value Types vs Reference Types in Swift | Stack, Heap & Memory Semantics
One of the most common iOS interview questions — and one of the most misunderstood. In this episode we go beyond "struct vs class" and dig into what actually happens in memory.
What's covered:
Value types & the Stack — why structs are fast and safe
Reference types & the Heap — pointers, shared identity, ARC
ARC in action — deinit, retain cycles, weak & unowned
Mixed types — structs that silently share heap objects
Stack variable capture — how local variables get promoted to the heap by closures
📂 Source Code (Swift Playground)
👉 https://github.com/khanboy1989/iOSInt...
📚 Further Reading
Swift.org — Allocations: https://www.swift.org/documentation/s...
Stack vs Heap in Swift: / understanding-memory-allocation-in-swift-s...
Memory Management + ARC: / memory-management-in-swift-heap-stack-arc
Memory Layout deep dive: https://theswiftdev.com/memory-layout...
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