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Follow the trail from foundational concepts to practical engineering decisions.

AI Coding & AgentsUpdated August 27, 20265 min read

[AI Context #6] Agent Memory Beyond Context (Plans, Memory, RAG)

If you have followed the series this far, you will see a common pattern: minimize what stays inside the context window. Part 3’s “write state to a file before /clear,” Part 4’s “only pointers instead of the body,” and Part 5’s “leave the process to subagents, send only conclusions to the main agent” all point in the same direction. But we have not yet properly addressed the destination of these files—that is, information sent outside the context.

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Software DesignUpdated August 27, 20264 min read

Swift Factory Method Pattern: Why Use It Instead of init

Swift factory functions give creation logic intent-revealing names and make return types and reuse policies flexible. This covers when to choose static func over init and how it differs from the GoF Factory Method.

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Software DesignUpdated August 27, 20264 min read

Constructor vs. Property vs. Method Injection: Swift DI

When building iOS apps with Swift, you inevitably face this question.

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Testing & Code QualityUpdated August 27, 20264 min read

Why Singletons Block Testing—and How Dependency Injection Solves It

Have you ever spent all night stuck because a Singleton made testing impossible?

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Software DesignUpdated August 27, 20265 min read

Dependency Injection (DI): Moving new Outside the Class

We often create required objects right where they are needed in the code. But the moment you try to write tests, you hit a wall. The creation code is embedded inside the class, so you cannot swap it out.

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