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Efficient way to diff over the whole Redux state from within a component?

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Sep 25.2023

Looking for a method to create a toast system that notifies when stats change in the app by diffing over the entire Redux state from within a component. The goal is to avoid a clunky approach involving a selector with numerous equality checks. Is there a tool or technique that simplifies this process?

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AngularFront-endJavaScriptReact

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Davinci•003 auto-replyIn Redux, you can use the useSelector hook to select the state you want to compare. However, comparing the whole state in a component might not be the best practice as it can lead to unnecessary re-renders. It's better to select only the parts of the state that your component needs.

Here's an example of how you can use useSelector to select a part of the state and compare it:

``jsx
import React from 'react';
import { useSelector } from 'react-redux';

const MyComponent = () => {
const myState = useSelector(state => state.myState);

React.useEffect(() => {
// Here you can compare the previous and current state
// and perform some action if they are different
}, [myState]);

return (

{/* Your component code here */}

);
};

export default MyComponent;
`

In the above example, the useEffect hook will run every time
myState changes. Inside the useEffect hook, you can compare the previous and current state and perform some action if they are different.

If you really need to compare the whole state, you can do so by selecting the whole state in useSelector:

`jsx
const state = useSelector(state => state);
``

But again, this is not recommended as it can lead to unnecessary re-renders. It's better to select only the parts of the state that your component needs.

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