Strong, Weak, and Unowned – Sorting out ARC and Swift

This article provides a detailed explanation of Automatic Reference Counting (ARC) in Swift, focusing on the differences between strong, weak, and unowned references. It starts with upfront conclusions, then delves into how ARC manages memory for class instances (reference types) but not for structs or enums (value types). The author clarifies that strong references are the default and most common, suitable for hierarchical parent-child relationships. Weak references are recommended for optional relationships to avoid retain cycles, while unowned references are for mandatory dependencies where one instance cannot exist without the other. The content is a technical tutorial aimed at Swift developers seeking to understand memory management nuances.