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
Live notifications, chat, dashboards and progress bars all need real-time updates, but not all need WebSockets. How each approach works, the trade-offs, and which one fits your feature.
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Off-by-one-day birthdays, events that jump an hour twice a year, and reports that disagree between servers. The rules for storing, sending and displaying dates that prevent all of them.
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Most state problems come from putting state in the wrong place, not from picking the wrong library. Local, shared, server, URL and form state, and the simplest tool for each one.
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Semantic versioning, lockfiles, npm ci, safe updates, security audits and choosing packages wisely. The habits that keep a JavaScript project installable, secure and up to date for years.
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Regular expressions look like line noise until the building blocks click. Character classes, quantifiers, anchors, groups and lookarounds, with real examples and the pitfalls that cause bugs.
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