The essential React Hooks Advanced Patterns cheat sheet: 7 concise chapters you can read in minutes, distilled from the full deck. When you're ready, drill the flashcards or test yourself under exam conditions.
React Hooks come with two hard rules that govern where and how they can be called. First, hooks must always be invoked at the top level of a React function — inside a component or...
Read full chapter →useEffect is the standard place to synchronize a component with an external system: subscriptions, timers, DOM mutations, analytics, and network requests. Three dependency-array sh...
Read full chapter →useRef returns a mutable container whose .current property persists across renders without triggering a re-render when mutated. That makes it the right tool for storing DOM nodes,...
Read full chapter →Three primitives form the foundation of render performance work. useMemo(factory, deps) memoizes the result of factory and recomputes only when a dep changes. useCallback(fn, deps)...
Read full chapter →useReducer is the right primitive when the next state depends on the previous state, when the state shape is complex (nested objects, multiple sub-fields), or when updates are bett...
Read full chapter →Custom hooks are just functions whose names start with use and that call other hooks. The prefix is not cosmetic — React's linter and DevTools use it to recognize hook calls and su...
Read full chapter →React 18 introduced two primitives for keeping the UI responsive during heavy work. useTransition returns [isPending, startTransition] and lets you mark a state update as low-prior...
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