React-test example

React components has a built-in state object. The state object is where you store property values that belongs to the component . When the state object changes, the component re-renders.

What Is ‘State’ in ReactJS? The state is a built-in React object that is used to contain data or information about the component . A component’s state can change over time; whenever it changes, the component re-renders.15 Şub 2022

import React, { useState } from ‘react’; function Example() { // Declare a new state variable, which we’ll call “count” const [count, setCount] = useState(0); We declare a state variable called count , and set it to 0 .

Syntax: We can use setState() to change the state of the component directly as well as through an arrow function . Example 1: Updating single attribute. We set up our initial state value inside constructor function and create another function updateState() for updating the state.24 Mar 2021