ARCHIVE · 11
Follow the trail from foundational concepts to practical engineering decisions.
"I woke up to a cloud bill of several million won." Posts like this appear regularly in vibe-coding communities, and they are enough to make anyone's stomach drop. A hobby app has returned a month's salary as an invoice. The scary part is that this is not an accident limited to unusually careless people. If you do not understand the billing model, it can happen to anyone. Billing…
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The AI covered in the previous seven installments was ultimately a “ask-and-answer” tool. People drove the conversation: refining questions, providing materials, and verifying answers. But the next step the AI industry has pursued for the past two years is different in kind. AI agents do not just converse—they take on the work itself.…
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Throughout this series, I urged you to attach materials. This time, we apply the brakes. Can you paste company documents into AI? Customer lists? Can you use AI-written copy directly in ads? This is not legal advice; it is a practical guide to the boundaries every general user should know.
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A stack removes data in LIFO order; a queue uses FIFO. This article explains why Swift has no dedicated Stack, how to build one with Array, and the performance trap caused by removeFirst in queues.
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In code written since Swift 5.6, you’ll see some or any before protocol names: some View, any Error, some Collection. Protocol names used to work directly in type positions, but the compiler now warns or errors unless you add any.…
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