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Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.

Any category Programming3 Python 2 JavaScript 1
Any topics APIs and Integrations 7 Automation and Scripting 3 Data Structures and Algorithms 2 Databases 11 Deployment and Containers 3 Object-Oriented Programming 3 Packaging and Dependencies 5 Performance Optimization 21 Programming Patterns 10 Testing and Debugging 9 Type Systems 14 Web Development 15
Any level Intermediate 3 Advanced 3
Programming Automation and Scripting Advanced Clear filters 3 results
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Running Many Requests at Once With asyncio.gather

asyncio.gather runs many waiting tasks at once in one thread and returns results in order. Avoid await in a loop and blocking calls, keep failures with return_exceptions=True, and limit concurrency with a Semaphore.

7 min read
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Speeding Up Many Downloads in Python With ThreadPoolExecutor

Downloads spend most of their time waiting. ThreadPoolExecutor lets many waits overlap: 20 half-second downloads in 2 seconds instead of 10. Handle failures with as_completed, pick a sensible worker count and respect the server.

6 min read
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Process a Large CSV in Node.js With Streams

Read a CSV too big for memory line by line with readline, total a column, and write a filtered copy with pipeline. Memory stays flat no matter how big the file is.

4 min read