[typescript]class static

Mon Mar 24

typescript

Author：Noritaka

class Person {
  static species = 'Homo sapiens';
  static isAdult(age: number) {
    if (age > 17) return true;
    return false;
  }
  readonly id: number = 32;
  constructor(readonly name: string, protected age: number) {
  }
  incrementAge() {
    this.age += 1;
  }
  greeting(this: Person) {
    console.log(`Hello! My name is ${this.name}. I am ${this.age} years old.`);
  }
}

class Teacher extends Person {
  get subject() {
    if (!this._subject) {
      throw new Error('There is no subject.');
    }
    return this._subject;
  }
  set subject(value) {
    this._subject = value;
  }
  constructor(name: string, age: number, private _subject: string) {
    super(name, age);
  }
  greeting() {
    console.log(`Hello! My name is ${this.name}. I am ${this.age} years old. I teach ${this._subject}.`)
  }
}
console.log(Person.species);
console.log(Person.isAdult(38));
console.log(Teacher.species);
console.log(Teacher.isAdult(10));