what is react state? code example

Example 1: state with react functions

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  render() {
    return (
      

        
You clicked {this.state.count} times
         this.setState({ count: this.state.count + 1 })}>
          Click me
        
      
    );
  }
}

Example 2: state in react

class BalanceInquiry extends Component {
  constructor(props) {
    super(props);
    this.state = {
      totalIncome: 0,
    };
  }

  render() {
    return 
totalIncome {this.state.totalIncome}
;
  }
}

Example 3: props and state react

function tick() {
  const element = (
    

      
Hello, world!
      
It is {new Date().toLocaleTimeString()}.
    
  );
  ReactDOM.render(    element,    document.getElementById('root')  );}

setInterval(tick, 1000);