let moonPhase = 'full';

switch (moonPhase) {
  case 'full':
    console.log('Howl!');
    break;
  case 'mostly full':
    console.log('Arms and legs are getting hairier');
    break;
  case 'mostly new':
    console.log('Back on two feet');
    break;
  default:
    console.log('Invalid moon phase!');
    break;
}