React 18: Handling State Updates from Multiple Child Components with useReducer
I'm following best practices but I'm having a hard time understanding I just started working with I'm refactoring my project and I'm encountering an issue with managing state updates in a parent component that involves multiple child components....... I'm using `useReducer` in my parent component to handle state, but when a state update is triggered from one child component, it seems to cause unintended re-renders in the others, which negatively affects performance. Here's a simplified version of my setup: ```javascript import React, { useReducer } from 'react'; const initialState = { count: 0, message: '' }; function reducer(state, action) { switch (action.type) { case 'increment': return { ...state, count: state.count + 1 }; case 'setMessage': return { ...state, message: action.payload }; default: return state; } } const ParentComponent = () => { const [state, dispatch] = useReducer(reducer, initialState); return ( <div> <h1>Count: {state.count}</h1> <ChildA dispatch={dispatch} /> <ChildB dispatch={dispatch} /> </div> ); }; const ChildA = ({ dispatch }) => { return <button onClick={() => dispatch({ type: 'increment' })}>Increment</button>; }; const ChildB = ({ dispatch }) => { return <button onClick={() => dispatch({ type: 'setMessage', payload: 'Hello from ChildB' })}>Update Message</button>; }; export default ParentComponent; ``` The problem arises when I click the button in `ChildA` to increment the count. This causes both `ChildA` and `ChildB` to re-render, even though only `ChildA` should be affected. The `message` state in `ChildB` isn't changing, yet it still re-renders every time the count changes. I've tried using `React.memo` on the child components to prevent unnecessary re-renders but it didn't seem to make a difference. I've also considered local state in the child components for some of the states but that doesn't fit well with my application's architecture. Is there a recommended way to optimize this pattern to ensure that only the necessary components re-render based on specific state changes? Any insights or best practices would be greatly appreciated! I'm coming from a different tech stack and learning Javascript. What's the correct way to implement this? The project is a mobile app built with Javascript. I'd really appreciate any guidance on this. I'm developing on CentOS with Javascript. My development environment is Windows 10. Is this even possible?