JavaScriptda OOPda meros olishda konstruktor

Meros olish paytida ota-ona konstruktorini qayta belgilash mumkin. Keling, misol orgali ko'rib chiqaylik. Faraz qilaylik, bizda quyidagi ota-ona klass mavjud:

javascriptclass User {
  constructor(name, surn) {
    this.name = name;
    this.surn = surn;
  }
  
  getName() {
    return this.name;
  }
  getSurn() {
    return this.surn;
  }
}

Faraz qilaylik, ota-ona klassidan quyidagi klass meros bo'lib qoladi:

javascriptclass Student extends User {
  
}

Faraz qilaylik, biz voris klassda konstruktorni kengaytirishni, unga qo'shimcha parametrlar qo'shishni xohlaymiz:

javascriptclass Student extends User {
  constructor(name, surn, year) {
    
  }
}

Bunday holda, biz birinchi qator sifatida super orqali ota-ona konstruktorini chaqirishimiz shart:

javascriptclass Student extends User {
  constructor(name, surn, year) {
    super();
  }
}

super buyrug'i aslida ota-ona konstruktoridir. Shuning uchun unga kerakli parametrlarni uzatamiz:

javascriptclass Student extends User {
  constructor(name, surn, year) {
    super(name, surn);
  }
}

Endi vorisda o'quv yilini vorisning o'z xususiyatiga yozamiz:

javascriptclass Student extends User {
  constructor(name, surn, year) {
    super(name, surn);
    this.year = year;
  }
}

Keling, o'quv yili uchun getter yaratamiz:

javascriptclass Student extends User {
  constructor(name, surn, year) {
    super(name, surn);
    this.year = year;
  }
  
  getYear() {
    return this.year;
  }
}