Port Already in Use (Node.js, or other js js)

 

Solution :

Passing child element reactjs

 

map di React

class RobotItems extends React.Component {
  render() {
    const topics = ["React", "JSX", "JavaScript", "Programming"];
    return (
      <div>
        <h3>Topics I am interested in</h3>
        <ul>
          {topics.map(top => <li>{top}</li>)}
        </ul>
      </div>
    );
  }
}

Available propTypes in ReactJS

Here is the available prop types that can be used in react :

For detail info about props, please see reusable-component document in official react site