Is it possible to utilize the useRef Hook for the purpose of storing and accessing previous state values?

Question

Is it possible to utilize the useRef Hook for the purpose of storing and accessing previous state values?

If you have already implemented the useState and useEffect Hooks for maintaining previous state, another approach is to utilize the useRef Hook to track previous state values as well.

javascript java html css reactjs

Answer 1

Answer №1

Utilizing the useRef hook in React can help you keep track of previous state values. Take a look at the code example provided below. For more information, refer to this insightful article: https://blog.logrocket.com/accessing-previous-props-state-react-hooks/

   function Counter() {
  const [count, setCount] = useState(0);
// Using the useRef Hook ensures data persistence between renders
  const prevCountRef = useRef();
  useEffect(() => {
    // Set the ref's current value to the count Hook
    prevCountRef.current = count;
  }, [count]); // Execute this code when the value of count changes
  return (
    <h1>
      Current Count: {count}, Previous Count: {prevCountRef.current}
      {/*Increment Button */}
      <button onClick={() => setCount((count) => count + 1)}>Increment</button>
    </h1>
  );
}

Answer 2

Utilizing the useRef hook in React can help you keep track of previous state values. Take a look at the code example provided below. For more information, refer to this insightful article: https://blog.logrocket.com/accessing-previous-props-state-react-hooks/

   function Counter() {
  const [count, setCount] = useState(0);
// Using the useRef Hook ensures data persistence between renders
  const prevCountRef = useRef();
  useEffect(() => {
    // Set the ref's current value to the count Hook
    prevCountRef.current = count;
  }, [count]); // Execute this code when the value of count changes
  return (
    <h1>
      Current Count: {count}, Previous Count: {prevCountRef.current}
      {/*Increment Button */}
      <button onClick={() => setCount((count) => count + 1)}>Increment</button>
    </h1>
  );
}

Is it possible to utilize the useRef Hook for the purpose of storing and accessing previous state values?

Answer №1

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