VisualizingState: Walkman State Machine Guard 2

WalkmanStateMachineGuard2.jsx

class Walkman extends React.Component {
 transition = (event) => {
   const preventTapeJam = /* ... */
   const shouldEject = event === 'STOP' && this.state.current === 'Stopped'
 
   if (!preventTapeJam) {
     /* … */
   } else if (shouldEject) {
     this.setState({ current: events.EJECT })
   }
 }
}