JavaScript and TypeScript

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JavaScript and TypeScriptA course for experienced programmers

Build a precise mental model of the languages, runtimes, browser, React, and modern tooling.

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  • JavaScript first

    Learn the language and runtime model before adding TypeScript or framework behavior.

  • Article based

    Read connected, long-form explanations with realistic examples embedded in the prose.

  • Complete path

    Progress from values and modules through asynchronous code, browser APIs, TSX, React, and tooling.

About this course ​

This course assumes you are already comfortable programming. Familiar syntax moves quickly; JavaScript- and TypeScript-specific semantics receive the detailed treatment.

There are no required assignments or exercise projects. Follow the articles in order, type or modify examples whenever useful, and use the sidebar to move between course parts.