How can I use a callback function with the useState hook in React

Question

With the help of proper code can you tell me How can I use a callback function with the useState hook in React?

Answer 1

In React, the useState hook does not provide a built-in way to execute a callback function immediately after a state update. However, you can achieve similar behavior by utilizing the useEffect hook to monitor changes in the state variable and execute a function in response.

Implementing a Callback After State Update with useEffect:

Initialize State with useState:

import React, { useState, useEffect } from 'react';

function MyComponent() {

  const [value, setValue] = useState(initialValue);

  // ...

}

Update State with setValue

const handleChange = (newValue) => {

  setValue(newValue);

};

Use useEffect to Detect State Changes:

Employ the useEffect hook to monitor changes to the value state. By specifying [value] as the dependency array, the effect runs after every change to value.

useEffect(() => {

  // Callback function logic here

  console.log('Value has been updated:', value);

  // Perform any side effects or additional logic here

}, [value]);