use setState in a function 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: passing function to setstate

//use this when current value of state depends on prevstate value For eg. toggle
this.setState(function(prevState){
    return {show: !prevState.showForm}
});