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

Any category Programming38 JavaScript 3 TypeScript 3 HTML and CSS 32
Any topics APIs and Integrations 5 Data Structures and Algorithms 3 Object-Oriented Programming 1 Packaging and Dependencies 6 Performance Optimization 1 Testing and Debugging 6 Type Systems 32 Web Development 3
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Partial and Required on a Form Draft Object

Derive a draft type with Partial, require every field with Required, and write one check that turns a draft into the finished type. After this, an unfinished form cannot reach the submit function.

4 min read
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Augment Express Request Without Fighting the Compiler

Add a user property to the Express request type with a module augmentation in one declaration file. After this, middleware and handlers agree on the type and you avoid the mistake that floods node_modules with errors.

5 min read
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Template Literal Types for /users/:id Routes

Turn a route pattern into a type that finds the parameter names and checks the paths you pass. After this, a typo in a route or a missing parameter is a compile error.

5 min read