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React useThrottle Hook: Throttle Values & Callbacks (2026) A scroll listener fires at whatever rate the compositor feels like — often 60 times a second, sometimes 120. mousemove is worse. Feed either
React useUpdateEffect Hook: Skip the First Render (2026) useEffect has no opinion about why it's running. Mount, update, doesn't matter — the callback fires either way. Which is how a "settings saved
React usePrevious Hook: Track Previous State & Props (2026) React gives you the current value of state and props on every render — and no built-in way to ask what the value was before. So everyone cop
React useDropZone Hook: Build a File Drop Zone (2026) Drag a file over a drop zone that has any child element inside it — an icon, a label, a preview thumbnail — and a hand-rolled isOver toggle starts
You wire up a fetch. The endpoint takes a query object, so you pass it in the dependency array. The effect fires, sets state, the component re-renders, the query object is rebuilt — a brand-new object
React useCookie Hook: Cookies as Reactive State (2026) A theme toggle stores the user's choice in a cookie so the server can render the right theme on the next request — no flash of the wrong mode. Th
React useResizeObserver Hook: Track Element Size Changes (2026) A chart component reads its container's width once on mount and draws itself to fit. Then the user collapses the sidebar. The container
React useObjectUrl Hook: Preview Files & Blobs Without Memory Leaks (2026) A user uploads a dozen images to a gallery editor. Each one gets a live preview via URL.createObjectURL(). The session runs f
React useLocalStorage Hook: SSR-Safe Persistent State (2026) The user spends two minutes setting up filters on your dashboard, hits refresh, and everything resets. useState is ephemeral by design — ev
