Practical engineering tips, design theory and performance breakdowns — written for developers and founders who like their advice tested in production.
Filtering by tag #javascript — clear
Frameworks change every few years. The language underneath doesn't. The JavaScript concepts that make React, Vue or any framework easier, and the ones that cause most beginner bugs.
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That red "blocked by CORS policy" message is the browser doing its job. Here is what it protects, why preflight requests fail, and how to fix CORS on the server for good.
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TypeScript catches bugs before they ship and makes refactoring far less scary, but it has real costs. What you gain, what it won't do for you, and how to adopt it without a painful rewrite.
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Clean code isn't about rules from a book. It's about the next person reading your code, who is often you. Practical habits for naming, functions, comments and structure that pay off every week.
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An effect that fires forever, runs twice, or reads stale state. Here is what is actually happening with React's useEffect dependencies, and the patterns that make effects predictable.
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Not all tests are equally useful. What each type of test catches, how much of each to write, and a pragmatic testing strategy for web apps that gives confidence without slowing you down.
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Missing awaits, await inside forEach, accidental waterfalls and swallowed errors. The async/await bugs that pass code review and fail in production, with the fix for each one.
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Write a failing test, make it pass, clean up. TDD sounds slow but often makes you faster. How the red-green-refactor loop works in practice, where it shines, and where it doesn't fit.
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Error messages look like noise until you know where to look. How to read the message, find your line in the stack trace, decode common errors, and turn a wall of red into a fix.
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