Static properties and methods

Описание: Mavzu:Static properties and methods;
1.Quyidagi kod qanday natija qaytaradi?

class Car {
static showType() {
return "This is a car.";
}
}
console.log(Car.showType());

a) "This is a car."
b) undefined
c) Error


2.Quyidagi kod qanday natija qaytaradi?

class Animal {
static staticMethod() {
return "I am static";
}
nonStaticMethod() {
return "I am non-static";
}
}
let tiger = new Animal();
console.log(tiger.staticMethod());

a) "I am static"
b) "I am non-static"
c) Error

3.Quyidagi kod qanday natija qaytaradi?

class User {
static sayHello() {
return "Hello, student!";
}
}
let student = new User();
console.log(student.sayHello());

a) "Hello, student!"
b) undefined
c) Error


4.Quyidagi kod qanday natija qaytaradi?

class Computer {
constructor(model) {
this.model = model;
}
static createDefault() {
return new this("Default Model");
}
}
let defaultPC = Computer.createDefault();
console.log(defaultPC.model);

a) "Default Model"
b) undefined
c) Error

5.Static metoddan foydalanib obyektlarni solishtirish

Tavsif:
Student nomli class yarating, uning constructori name va grade (ball) qabul qilsin.
static compare(s1, s2) nomli metod yozing, u ikki talabani grade bo‘yicha solishtirsin.
students massivini yaratib, uni compare metodidan foydalangan holda saralang va eng yuqori ball to‘plagan talabani
ekranga chiqaring.

Natija misoli:
console.log(students[0].name); // Eng yuqori ball to'plagan talaba ismi
6.Static metoddan meros olish
Tavsif:

Animal classini yarating va unda static kingdom() metodini yozing.
kingdom() metodi "Animalia" matnini qaytarsin.
Dog classi Animal dan meros olsin.
Dog classidan foydalanib kingdom() metodini chaqiring.

Natija misoli:
console.log(Dog.kingdom()); // "Animalia"
7.Xatoni toping va tuzating
Quyidagi kodda xatolik bormi? Agar bo‘lsa, uni tuzatib, to‘g‘ri ishlashini ta’minlang.

class Laptop {
static brand = "TechX";

constructor(model) {
this.model = model;
}

getBrand() {
return this.brand;
}
}

let myLaptop = new Laptop("X100");
console.log(myLaptop.getBrand());