Here is a useSafeState hook that ignores state changes after a component has been unmounted.

Hook that debounces useState() changes.

This React hook demonstrates how to debounce state updates from `useState` by wrapping the setter in a custom `useStateDebounce` function. It uses `useCallback`, `useRef`, and `useEffect` to manage a `window.setTimeout` and `window.clearTimeout` pair, delaying the `setState` call by a specified `ms` interval. The hook accepts an initial state value and returns the debounced state and setter, preventing rapid re-renders from frequent input changes. The example is implemented as a TypeScript `.tsx` file, showing the logic in isolation without external data sources or visualization libraries.

68% match

Hook that stores a state value as a JSON string to prevent render updates when an object value is mutated but doesn't change.

This example demonstrates a React hook that stores a state value as a JSON string, preventing unnecessary render updates when an object is mutated but its content remains unchanged. It shows how `useState`, `useMemo`, and `useCallback` work together to serialize the initial state via `JSON.stringify`, parse it back with `JSON.parse` inside a memoized value, and provide a setter that stringifies the next value before updating state. The hook uses TypeScript generics for type safety, and the behavior is visible in the code, though it does not display any data visualization or rendering logic.

67% match

Hook that records the history of state changes as an Array buffer upto a certain length.

A React hook records state changes as an array buffer capped at a specified length. The hook initializes with a single state value and appends each new update, trimming older entries to maintain the size limit via array slicing. It uses React’s `useState` to store the history and `useCallback` to memoize the update function. This example demonstrates a generic TypeScript utility for tracking state evolution, with no rendering or visualization logic included.

65% match

useEffect

This example demonstrates the React useEffect hook by showing how a web application responds to user-triggered state changes. Three buttons—Posts, Users, and Comments—update a resource type displayed as a header, while the hook logs lifecycle events to the console on mount, on resource change, and during cleanup. The code uses React 16.9.0 with the useState and useEffect APIs directly from the React and ReactDOM UMD builds, and it renders the interface into a root div using ReactDOM.render.

RRichard Burd

React cheatsheet

This animated React cheatsheet presents reusable code patterns for hooks, state management, and component composition. The example uses React hooks including `useState`, `useEffect`, `useRef`, `useReducer`, and `useContext`, alongside custom hooks like `useTimeout` and higher-order components. It demonstrates conditional JSX rendering, callback-based state updates, and the containment pattern via props slots. The animation shows code snippets transitioning between sections, sourced from a gist by abernier.

Aabernier

Gist 782553a6e275e4bfc694a6a3a6d1a46f

This example demonstrates how the React `useRef` hook preserves a mutable value across re-renders, unlike the `createRef` API, which creates a new ref each render. It visually compares the two by displaying the current render index alongside the persisted value from `useRef` and the reset value from `createRef` after a button click triggers a state update. The code uses `React.useState` to drive re-renders and `React.useRef` to hold a stable reference, while `createRef` shows its transient nature. The example also uses `useEffect` with a custom comparison to illustrate deep object dependency handling, referencing the React documentation.

HHuyAms

Hook that increments a counter every time useState() is changed.

This example demonstrates a React hook that tracks how many times a component’s state value is updated. The hook, `useStateCount`, returns both the current value and an incrementing counter that increases each time `setValue` is called. It uses React’s `useState` to store a tuple of `[count, value]` and `useCallback` to memoize the update function, depending on the current count. The code is written in TypeScript and shows a pattern for monitoring state changes without external libraries, relying solely on React’s built-in hooks.

A hook that persists useState() to localStorage.

This example demonstrates a custom React hook that synchronizes a component’s state with the browser’s localStorage, enabling persistent data across page reloads. The hook, `useStateStorage`, initializes state with a provided default value and reads any stored JSON from localStorage on mount, updating the state if valid. It exposes a setter function that writes both the new state and its JSON-serialized form to localStorage. The code uses React’s `useState`, `useEffect`, and `useCallback` APIs to manage lifecycle and memoization, while leveraging `localStorage.getItem` and `localStorage.setItem` for storage operations.