A comprehensive guide covering five patterns for migrating React class components to functional components using Hooks. Covers useState and useReducer for state management, useEffect for lifecycle methods (componentDidMount, componentDidUpdate, componentWillUnmount), React.memo as a PureComponent replacement, useCallback and useMemo for performance optimization, and useContext as a contextType replacement. Also identifies error boundaries as the one case that must remain a class component, and includes before-and-after code comparisons for each pattern.
Table of contents
IntroductionKey TakeawaysPrerequisitesWay 1 — Converting a Render-Only Class ComponentWay 2 — Converting this.state and setState Using useStateWay 3 — Converting Multiple State PropertiesWay 4 — Converting Lifecycle Methods Using useEffectWay 5 — Optimizing Performance After ConversionHandling Edge Cases and Migration BoundariesFrequently Asked QuestionsConclusionSort: