```javascript
//FROM
switch (bird.type) {
case 'EuropeanSwallow':
return "average";
case 'AfricanSwallow':
return (bird.numberOfCoconuts > 2) ? "tired" : "average";
case 'NorwegianBlueParrot':
return (bird.voltage > 100) ? "scorched" : "beautiful";
default:
return "unknown";
}
//TO
class EuropeanSwallow {
get plumage() {
return "average";
}}
class AfricanSwallow {
get plumage() {
return (this.numberOfCoconuts > 2) ? "tired" : "average";
}
)
class NorwegianBlueParrot {
get plumage() {
return (this.voltage > 100) ? "scorched" : "beautiful";
}
}
```