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ASCII Tree from Indented List Field Guide
A great ASCII tree starts in the markdown you already wrote, not the drawing tool…
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Regex Cheat Sheet Field Guide: The Five Symbols Between You and a Working Pattern
Regex is one of the few programming primitives you relearn every year, and a cheat…
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OTP Generator Field Guide: How to Generate Codes That Survive Contact With Users
The best OTP is the kind users don't have to think about. When you ask…
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A Bracket Is a Variable That Argues: A Field Guide to Tailwind Arbitrary Values
You can paste any Tailwind class into a bracket and the parser still has to…
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The Ampersand That Broke the Feed: A Field Guide to XML Escape / Unescape
The Ampersand That Broke the Feed: A Field Guide to XML Escape / Unescape A…
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When the Five-Day Week Bites Back: A Field Guide to Business Day Calculator
A 5-day business week in a 7-day calendar is the source of every "add 7, ship Friday, miss Friday" mistake. Two operations, a no-holiday rule, and three lines of source — what this calculator actually does.
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What a real SEO audit looks like before you ship a page
The audit found a 53-word meta description, three H1 tags, eight images without alt text,…
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The Five Forms of ISO 8601 You Will Actually Meet: A Field Guide to the Date Format That Is Actually Five Formats
The ISO 8601 standard is not one format — it is a family of five. Here is how to tell them apart, why the trailing Z matters, and what a real validator actually checks.
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Why Your XML Output Looks Wrong to a Stranger: A Field Guide to XML Formatter
Beautify, minify, and the four serializer decisions the XML spec deliberately leaves undefined — what a DOM-aware formatter actually changes.