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

Any category Programming7 Python 3 JavaScript 3 TypeScript 1
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 Intermediate 2 Advanced 1
JavaScript Object-Oriented Programming Clear filters 3 results
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JavaScript Classes With Getters and Setters

Getters compute a value when you read it, so totals never go stale. Setters check a value when you assign it, so a negative price throws instead of saving. With private fields, nobody can go around them.

4 min read
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Custom Error Classes You Can Actually Catch

Stop checking error messages with includes(). Extend Error, set name, add the fields the handler needs, catch with instanceof, and wrap low-level errors with cause so the real reason isn't lost.

4 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