write state in the class component react code example

Example 1: setstate react js

constructor(props) {
        super(props);
        this.state = {
            isActive: true,
        };
    }

    checkStatus = () => {
        this.setState({		// use this function
            'isActive' : !this.state.isActive,
        });
    }

Example 2: reading state react

<button onClick={() => this.setState({ count: this.state.count + 1 })}>
    Click me
  </button>