😅Using state when it's not necessary can lead to unnecessary re-renders. Consider using refs instead.
🔄Always use the function version of setState to ensure correct variable updates, especially when setting state based on previous state.
📚Use the effect version of useState to handle side effects, such as logging or network requests, after the component has rendered.
What are the common mistakes when using React state?
—The common mistakes when using React state include using state when it's not necessary, not using the function version of setState, and not understanding how state updates are asynchronous.
When should I use refs instead of state in React?
—You should use refs instead of state in React when you don't need to trigger re-renders or track changes in the UI. Refs are useful for accessing DOM elements or storing values that don't affect the component's rendering.
What is the function version of setState in React?
—The function version of setState in React allows you to update state based on the previous state. This is useful when you need to update state multiple times within the same scope and want to avoid race conditions.
What is the difference between useState and useEffect in React?
—useState is used to define and update state variables in React. useEffect is used to handle side effects, such as API calls or subscribing/unsubscribing to events, after the component has rendered.
How can I avoid unnecessary re-renders in React?
—To avoid unnecessary re-renders in React, make sure to use state or useRef only when necessary, optimize rendering using useMemo or useCallback, and use shouldComponentUpdate or React.memo to prevent unnecessary re-renders in class or functional components respectively.
00:00The video discusses the common mistakes when writing clean React code.
02:20Using state when it's not necessary can lead to unnecessary re-renders.
05:39Always use the function version of setState to ensure correct variable updates.
08:30Use the effect version of useState to handle side effects after the component has rendered.
