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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 Programming16 Python 6 JavaScript 4 TypeScript 6 DevOps1 Docker 1
Any topics APIs and Integrations 12 Automation and Scripting 6 Data Structures and Algorithms 8 Databases 32 Deployment and Containers 4 Object-Oriented Programming 7 Packaging and Dependencies 16 Performance Optimization 24 Programming Basics 18 Programming Patterns 12 Security 1 Testing and Debugging 32 Type Systems 35 Web Development 38
Any level Beginner 2 Intermediate 9 Advanced 5
Programming Packaging and Dependencies Clear filters 16 results
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Install @types for a Library That Ships No Types

Reproduce the missing declaration error, check whether the library has its own types, install the @types package and prove the types work. After this, you know the fallback when no types package exists.

4 min read
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Migrate One Module While Testing Its JavaScript Boundary

Convert one JavaScript module, catch a lost runtime guard, and verify an unchanged JavaScript caller against the emitted TypeScript build.

5 min read
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Diagnose a Stale TypeScript Project-Reference Build

Reproduce a project-only build that consumes stale shared declarations, rebuild the graph, and verify that an API change reaches its consumer.

6 min read
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Hand-Write a .d.ts for a Small JS Helper

Write a declaration file for a JavaScript helper with a generic function and an overload, then test it with a short file. After this, calls to the helper are checked and the JavaScript stays as it is.

5 min read