example.jsx

class Fun extends Component {
  render() {
    return (
      <div>
        <h1>Hi</h1>
        {(() => {
          if (this.props.one) return <span>Fun</span>
          if (this.props.two || this.props.three) return <h1>Stuff</h1>;
          return <p>WEEEEE</p>
        })()}
      </div>
    )
  }
}