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Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

Any category Programming12 Python 7 JavaScript 5
Any topics APIs and Integrations 5 Automation and Scripting 1 Data Structures and Algorithms 2 Object-Oriented Programming 3 Packaging and Dependencies 4 Performance Optimization 6 Programming Basics 10 Programming Patterns 5 Testing and Debugging 10 Type Systems 1 Web Development 3
Any level Advanced 5
JavaScript Programming Patterns Clear filters 5 results
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Closures for Private State: A Counter You Can't Break

Keep a counter's value in a closure so nothing outside can set it to -5 or "abc". The pattern, how it compares with a class with

3 min read
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Fix a Bound Event Listener That Will Not Detach

Trace a wrong callback receiver, bind one stable listener, and verify start, stop and restart without duplicate or stale subscriptions.

6 min read
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Predict the Output: Event Loop Order in 6 Snippets

Six short snippets with setTimeout, promises, await and queueMicrotask. Predict the order, run it, then read why. The one rule: sync code first, then all microtasks, then the next task.

4 min read
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Batch API Calls With Promise.allSettled

Send many requests, keep the successes, and report the failures instead of losing everything to one rejected promise. Plus limiting how many run at once.

4 min read
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Paginate an API With an Async Generator

Hide page numbers and "next" links inside an async generator, then loop over every record with for await. Stop early and the remaining pages are never fetched.

4 min read