[TypeScript] Getter와 Setter

Getter와 Setter

일반 멤버 변수처럼 사용 가능
어떠한 계산을 해야할 때 유용하게 사용 가능

 class User1 {
    firstName: string;
    lastName: string;
    fullName: string;
    constructor(firstName: string, lastName: string) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.fullName = `${firstName} ${lastName}` // 한번 할당 되면 그대로 고정
    }
  }
  const user1 = new User1('sumin', 'hong');
  console.log(user1);
  user1.firstName = 'eunmi';
  console.log(user1.fullName) // sumin hong

  class User2 {
    firstName: string;
    lastName: string;
    get fullName(): string {
      return `${this.firstName} ${this.lastName}`
    }
    constructor(firstName: string, lastName: string) {
      this.firstName = firstName;
      this.lastName = lastName;
    }
  }
  const user2 = new User1('sumin', 'hong');
  console.log(user2);
  user2.firstName = 'eunmi';
  console.log(user2.fullName) // eunmi hong

  class User {
    get fullName(): string {
      return `${this.firstName} ${this.lastName}`;
    }
    private internalAge = 4;
    get age(): number {
      return this.internalAge;
    }
    set age(num: number) {
      if (num < 0) {
      }
      this.internalAge = num;
    }
    constructor(private firstName: string, public lastName: string) { }
  }
  const user = new User('Steve', 'Jobs');
  user.age = 6;
  console.log(user.fullName);