button-increment.jsx

class ButtonIncrement extends React.Component {
    state = { counter: 0 }

    handleOnClick = () => {
        this.setState((prevState) => ({
            counter: prevState.counter + 1
        }));
    }

    render() {
        return (
            <Button
                onClick={this.handleOnClick}
                buttonText={`Current counter: ${this.state.counter}`}
                />
        )
    }
}