how to use if else statement in ReactDOM.render code example

Example 1: inline if in html component

Condition ? Block_For_True : Block_For_False

Example 2: react if statement

render() {
  const isLoggedIn = this.state.isLoggedIn;
  return (
    <div>
      The user is <b>{isLoggedIn ? 'currently' : 'not'}</b> logged in.    </div>
  );
}