JS-React: condition ? expressionIfTrue : expressionIfFalse

If they ask "how old are you" before entering the club,this is a good training.

HTML(none)
<div id="app"></app>
CSS(sass)
html, body
  height: 100%
  
body
  background: #333
  display: flex
  justify-content: center
  align-items: center
  font-family: Helvetica Neue
  
h1
  font-size: 2em
  color: #eee
  display: inline-block

a
  color: white
p
  margin-top: 1em
  text-align: center
  color: #aaa
JAVASCRIPT(babel)
const inputStyle = {
  width: 235,
  margin: 5
};

class CheckUserAge extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      input: "",
      userAge: ""
    };
    this.submit = this.submit.bind(this);
    this.handleChange = this.handleChange.bind(this);
  }
  handleChange(e) {
    this.setState({
      input: e.target.value,
      userAge: ""
    });
  }
  submit() {
    this.setState({
      userAge: this.state.input
    });
  }
  render() {
    const buttonOne = <button onClick={this.submit}>Submit</button>;
    const buttonTwo = <button>You May Enter</button>;
    const buttonThree = <button>You Shall Not Pass</button>;
    return (
      <div>
        <h3>Enter Your Age to Continue</h3>
        <input
          style={inputStyle}
          type="number"
          value={this.state.input}
          onChange={this.handleChange}
        />
        <br />
        {this.state.userAge === ""
          ? buttonOne
          : this.state.userAge >= 18 ? buttonTwo : buttonThree}
      </div>
    );
  }
}
React.render(<CheckUserAge />, document.getElementById("app"));

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