Default Prop example

by Rich Costello

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

class Button extends React.Component {
	render() {
  	return <button className="btn">{this.props.buttonLabel}</button>
  }
}
Button.defaultProps = {buttonLabel: 'Submit'}

class Content extends React.Component {
  render() {
    return <div>
      <Button buttonLabel="Start"/>
      <Button />
      <Button />
      <Button />
    </div>;
  }
}

ReactDOM.render(
  <Content />,
  document.getElementById('container')
);