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}}</ref> Hooks are functions that let developers "hook into" React state and lifecycle features from function components.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-overview.html|title=Hooks at a Glance – React|website=reactjs.org|language=en|access-date=2019-08-08|archive-date=2023-03-15|archive-url=https://web.archive.org/web/20230315054047/https://reactjs.org/docs/hooks-overview.html|url-status=live}}</ref> Notably, Hooks do not work inside classes — they let developers use more features of React without classes.<ref>{{Cite web |date=2020-01-16 |title=What the Heck is React Hooks? |url=https://soshace.com/2020/01/16/what-the-heck-is-react-hooks/ |url-status=live |archive-url=https://web.archive.org/web/20220531133601/https://blog.soshace.com/what-the-heck-is-react-hooks/ |archive-date=2022-05-31 |access-date=2020-01-24 |website=Soshace |language=en}}</ref>
React provides several built-in hooks such as <code>useState</code>,<ref>{{Cite web|url=https://reactjs.org/docs/hooks-state.html|title=Using the State Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-07-30|archive-url=https://web.archive.org/web/20220730180312/https://reactjs.org/docs/hooks-state.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|37}} <code>useContext</code>,{{sfn|Wieruch|2020}}{{rp|11}}<ref name="reactjs.org-2">{{Cite web|url=https://reactjs.org/docs/hooks-state.html|title=Using the State Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-07-30|archive-url=https://web.archive.org/web/20220730180312/https://reactjs.org/docs/hooks-state.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|12}} <code>useReducer</code>,{{sfn|Wieruch|2020}}{{rp|92}}<ref name="reactjs.org-2" />{{sfn|Larsen|2021}}{{rp|65-66}} <code>useMemo</code>{{sfn|Wieruch|2020}}{{rp|154}}<ref name="reactjs.org-2" />{{sfn|Larsen|2021}}{{rp|162}} and <code>useEffect</code>.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-effect.html|title=Using the Effect Hook – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-08-01|archive-url=https://web.archive.org/web/20220801212858/https://reactjs.org/docs/hooks-effect.html|url-status=live}}</ref>{{sfn|Larsen|2021}}{{rp|93-95}} Others are documented in the Hooks API Reference.<ref>{{Cite web|url=https://reactjs.org/docs/hooks-reference.html|title=Hooks API Reference – React|website=reactjs.org|language=en|access-date=2020-01-24|archive-date=2022-08-05|archive-url=https://web.archive.org/web/20220805061010/https://reactjs.org/docs/hooks-reference.html|url-status=live}}</ref>{{sfn|Wieruch|2020}}{{rp|62}} <code>useState</code> and <code>useEffect</code>, which are the most commonly used, are for controlling [[State (computer science)|state]]{{sfn|Wieruch|2020}}{{rp|37}} and [[Side effect (computer science)|side effects]],{{sfn|Wieruch|2020}}{{rp|61}} respectively.
==== Rules of hooks ====
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