new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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React · all subjects

breaking changes & deprecations

5 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Latest React version

The latest version of React is 19.2, documented at react.dev.

React versioning policy

React documentation is kept updated within major versions. Previous major versions are archived with their docs available at x.react.dev (e.g., 18.react.dev for React 18). Minor and patch versions do not get separate documentation.

Previous React major versions documentation

Previous React major versions are documented at: 18.react.dev, 17.react.dev, 16.react.dev, and 15.react.dev.

React 18 legacy docs location

The legacy React 18 documentation is available at legacy.reactjs.org. React 17 and versions below are hosted on legacy sites.

React initial release date

React was open-sourced on May 29, 2013. The initial commit hash is 75897c.

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