class MyComponent extends React.Component {

    constructor() {

        super();

        this.state = { elements: 5 }

    }

    logOutput (num) {

      console.log(num)

    }

​

    renderElements() {

     const output = [];

​

        for(let i = 0; i < this.state.elements; i ++){

            this.logOutput(i);

            output.push(<div key={i}>HI</div>);

        }

​

        return output;

    }

​

    render() {

        return (

            <div>{this.renderElements()}</div>

        );

    }

}

​

ReactDOM.render(<MyComponent />, document.getElementById('app'));