React Hooks Cheatsheet

React, a popular JavaScript library for building user interfaces, introduced Hooks to make functional components more powerful and expressive. Let’s dive into the React Hooks Cheatsheet to understand how they enhance the development experience.

React Hooks Cheatsheet

In the ever-evolving landscape of web development, React Hooks have become indispensable for building dynamic and efficient user interfaces. Hooks allow developers to manage state, handle side effects, and reuse logic in functional components. This article serves as a comprehensive guide and cheatsheet for mastering React Hooks.

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State Hooks

State Hooks are used to manage state in functional components. They allow us to add local state to our function components.

useState Hook

useState declares a state variable that can be immediately updated and assigned to any type of data.

const [search, setSearch] = useState("");

useReducer Hook

useReducer declares a state variable inside a reducer function with update logic

const [state, dispatch] = useReducer(counterReducer, { count: 0 });

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Context Hooks

Context Hooks are used to share state between components without having to pass props down manually at every level.

As an example, the top-level component of your application can transmit the current UI style to all components, regardless of depth, below it.

React context allows you to prevent “prop drilling,” which is the practice of transferring data from one component to its child and then from that child component to another child component.

Every component that subscribes to the context receives all of the data with context.

useContext Hook

useContext  reads and subscribes to a context

const theme = useContext(ThemeContext);

Ref Hooks

Ref Hooks are used to access DOM nodes or React elements created in the render method. They allow us to access DOM nodes or React elements created in the render method.

useRef Hook

useRef declares a ref and you can hold any value in it

const inputRef = useRef();

useImperativeHandle Hook

useImperativeHandle lets you customize the ref exposed by the component. This hook is rarely used

useImperativeHandle(ref, () => {
})

Effect Hooks

Effect Hooks are used to perform side effects in function components. They allow us to perform side effects in function components.

useEffect Hook

useEffect essentially allows you to implement side effects in functional components. This covers communication with external systems such as data retrieval, subscriptions, manual DOM manipulation, and so forth.

useEffect(() => {
  const unsubscribe = socket.connect(userId);
  return () => {
    unsubscribe();
  };
}, [userId]);

useLayoutEffect Hook

With useLayoutEffect we can read DOM layout and do DOM mutations before the browser paints.

useLayoutEffect(() => {
  // Read DOM layout
});

useInsertionEffect Hook

with useInsertionEffect we can do DOM mutations after the browser paints.

useInsertionEffect = () => {
  // Do DOM mutations here
}

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Subscribing Hooks

Subscribing Hooks are used to subscribe to external data sources and update our state when they change.

useSyncExternalStore Hook

With useSyncExternalStore we can subscribe to external data sources and update our state when they change.

useSyncExternalStore = () => {
  // Subscribe to external data source
  // Update state when data changes
}

Memoization Hooks

Memoization Hooks are used to optimize expensive calculations. They allow us to cache the result of a function and only recompute it if its dependencies change.

useCallback Hook

With useCallback Hook we can cache the result of a function and only recompute it if its dependencies change.

const memoizedCallback = useCallback(() => {
  doSomething(a, b);
}, [a, b]);

useMemo Hook

With useMemo Hook we can cache the result of a function and only recompute it if its dependencies change.

const memoizedValue = useMemo(() => {
  return computeExpensiveValue(a, b), [a, b];
});

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Accessibility Hooks

Accessibility Hooks are used to make our apps more accessible to users with disabilities.

useId Hook

With useId Hook we can generate a unique ID that is guaranteed to be the same between renders.

const id = useId();

Debug Hooks

Debug Hooks are used to debug our custom Hooks. These hooks are not meant to be used in production code.

useDebugValue Hook

With useDebugValue Hook we can label our custom Hooks to make them easier to debug.

useDebugValue('my custom hook');

Events Hooks

Events Hooks are used to handle events in function components. They allow us to handle events in function components.

useEvent Hook

With useEvent Hook we can extract non-reactive effect logic into an event function.

useEvent(callback)

Transition Hooks

Transition Hooks are used to mark updates as transitions. They allow us to mark updates in the provided callback as transitions.

useTransition Hook

With useTransition Hook we can mark updates in the provided callback as transitions.

startTransition (() => {
   setCount ( count + 1);
}）

useDeferredValue Hook

With useDeferredValue Hook we can defer to more urgent updates.

const deferredValue = useDeferredValue(value);

Conclusion: React Hooks Cheatsheet

In conclusion, the React Hooks Cheatsheet serves as a comprehensive resource for developers looking to master the art of functional component development. By embracing React Hooks, developers can streamline their workflow, create more maintainable code, and stay ahead in the dynamic world of web development.