Using React.memo with dynamic props causing unnecessary re-renders in React 17
I can't seem to get I've been struggling with this for a few days now and could really use some help. I'm encountering a performance issue in my React 17 application when using `React.memo` with a component that receives props that change frequently. I have a child component that takes user input and then displays it. However, despite using `React.memo`, I'm noticing that it still re-renders on every keystroke, which leads to laggy performance. Here's the code for the child component: ```javascript const UserInput = React.memo(({ value, onChange }) => { console.log('Rendering UserInput'); return <input type='text' value={value} onChange={onChange} />; }); ``` And the parent component looks like this: ```javascript const ParentComponent = () => { const [inputValue, setInputValue] = useState(''); const handleChange = (e) => { setInputValue(e.target.value); }; return <UserInput value={inputValue} onChange={handleChange} />; }; ``` I thought `React.memo` would prevent unnecessary re-renders, but it seems like any change to the `inputValue` state causes `UserInput` to re-render. I tried wrapping the `onChange` handler in `useCallback`, but it didn't seem to make a difference: ```javascript const handleChange = useCallback((e) => { setInputValue(e.target.value); }, []); ``` The props `value` and `onChange` are being passed down correctly, but it still logs 'Rendering UserInput' every time I type in the input field. Am I misunderstanding how `React.memo` works, or is there something else I need to do to optimize this component's rendering? Any insights would be greatly appreciated! I've been using Javascript for about a year now. I'd be grateful for any help.