Using useState is fundamental in React for managing state within functional components. Here's a breakdown of how to use and implement useState, and when it's appropriate to do so:
When to Use useState:
- Managing Component State: Use useState when you need to manage component-specific state within a functional component.
- Simple Local State: Use useState for simple state that doesn't require complex logic or actions.
- State that Can Change Over Time: Use useState when you have a piece of data that can change over time based on user interactions, network requests, or other events.
How to Use useState:
- Import the Hook: Import the useState hook from React.
- Invoke useState with Initial Value: Call useState and provide the initial value for the state.
- Access and Update State: Use state to access the current state value and setState to update the state.
import React, { useState } from 'react';
const Counter = () => { const [count, setCount] = useState(0);
const increment = () => { setCount(count + 1); };
const decrement = () => { setCount(count - 1); };
return ( <div> <p>Count: {count}</p> <button onClick={increment}>Increment</button> <button onClick={decrement}>Decrement</button> </div> );};
export default Counter;