ARCHIVE · 05
Follow the trail from foundational concepts to practical engineering decisions.
Categories cannot add ivars, but Associated Objects let you attach values. This article explains the side table stored beside objects, a complete category-property implementation, and memory policies where assign requires care.
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Vibe Coding mishaps are decided when you write the first rule file, not when you read the code. Here are five rules for CLAUDE.md and .cursorrules covering security, duplication, architecture, completion criteria, and scope, with example wording.
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Delegates and closures handle the same callback needs, but they have different trade-offs. This article implements the same example side by side, distills five practical differences, and summarizes how to choose based on event count, relationship lifetime, and whether a return value is needed.
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An actor is Swift’s fourth kind of type, protecting its own state. This guide explains how serialized access lets the compiler catch data races, including the classic reentrancy trap.
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Concurrency is about structuring work across multiple tasks, while parallelism is about hardware executing tasks at the same time. This article explains why concurrency works on a single core and what Swift Concurrency means.
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