Convert React class components to functional ones using Hooks like useState and useEffect, plus memoization, callbacks, and error boundaries.

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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.

Convert Class Components to Functional Components with React Hooks

Way 1 — Converting a Render-Only Class Component

Way 2 — Converting this.state and setState Using useState

Way 3 — Converting Multiple State Properties

Way 4 — Converting Lifecycle Methods Using useEffect

Way 5 — Optimizing Performance After Conversion

Handling Edge Cases and Migration Boundaries