Reset React.js State Via Component key Prop

When working with React.js, there may be times when you need to reset the state of a component. One way to achieve this is by using the component key prop.

The key prop is a special attribute that React uses to keep track of components when they are rendered in a list. By changing the key of a component, React will unmount the old component and mount a new one, effectively resetting its state.

Here’s an example of how to use the key prop to reset the state of a component:

    
    import React, { useState } from 'react';

    const ResettableComponent = ({ keyProp }) => {
        const [count, setCount] = useState(0);

        const resetState = () => {
            setCount(0);
        }

        return (
            

                
Count: {count}
                 setCount(count + 1)}>Increment
                Reset
            
        );
    }

    const App = () => {
        const [key, setKey] = useState(0);

        const resetComponent = () => {
            setKey(prevKey => prevKey + 1);
        }

        return (
            

                
                Reset Component
            
        );
    }

    export default App;
    
    

In this example, we have a ResettableComponent that takes a keyProp as a prop. This keyProp is used as the key attribute of the component. We also have an App component that holds the key in its state and passes it down to the ResettableComponent. When the “Reset Component” button is clicked, the key in the state is updated, causing the ResettableComponent to be unmounted and mounted again with a new key, effectively resetting its state.

Using the key prop to reset the state of a component can be a useful technique when working with React.js. It provides a simple and effective way to manage the state of components and ensure that they are re-rendered when needed.