class Person {
get officeAreaCode() {return this._telephoneNumber.areaCode;}
get officeNumber() {return this._telephoneNumber.number;}
}
class TelephoneNumber {
get areaCode() {return this._areaCode;}
get number() {return this._number;}
}
class Person {
get officeAreaCode() {return this._officeAreaCode;}
get officeNumber() {return this._officeNumber;}
inverse of Extract Class