Module4.js

//Task 1
function printOwnProperties(obj) {
    for (let key in obj) {
        if (obj.hasOwnProperty(key)) {
            console.log(`${key}: ${obj[key]}`);
        }
    }
}
const person = {
    name: "John",
    age: 30,
    occupation: "Developer"
};

printOwnProperties(person);

//Task 2
function checkProperty(str, obj){
    return obj.hasOwnProperty(str);
}
const child = {
    name: "John",
    age: 10,
    occupation: "Developer"
};
console.log(checkProperty("name", child));//true
console.log(checkProperty("family", child));//false

//Task 3
function createObject(){
    return Object.create(null);
}
const emptyObj = createObject();
console.log(emptyObj);
console.log(Object.getPrototypeOf(emptyObj));



//Task 4
function ElectricalAppliance(name, power) {
    this.name = name;
    this.power = power;
}


ElectricalAppliance.prototype.plugIn = function() {
    console.log(`${this.name} включен в розетку.`);
};


function DeskLamp(name, power) {
    ElectricalAppliance.call(this, name, power);
}


DeskLamp.prototype = Object.create(ElectricalAppliance.prototype);
DeskLamp.prototype.constructor = DeskLamp;



function Computer(name, power) {
    ElectricalAppliance.call(this, name, power);
}


Computer.prototype = Object.create(ElectricalAppliance.prototype);
Computer.prototype.constructor = Computer;



const deskLamp = new DeskLamp("Настольная лампа", 60);
const computer = new Computer("Компьютер", 500);


deskLamp.plugIn();
computer.plugIn();


const totalPower = deskLamp.power + computer.power;
console.log(`Потребляемая мощность: ${totalPower} Вт.`);


//Task 5
class ElectricalAppliance {
    constructor(name, power) {
        this.name = name;
        this.power = power;
    }

    plugIn() {
        console.log(`${this.name} включен в розетку.`);
    }
}

class DeskLamp extends ElectricalAppliance {
    constructor(name, power) {
        super(name, power);
    }
}

class Computer extends ElectricalAppliance {
    constructor(name, power) {
        super(name, power);
    }
}

const deskLamp = new DeskLamp("Настольная лампа", 60);
const computer = new Computer("Компьютер", 500);

deskLamp.plugIn();
computer.plugIn();

const totalPower = deskLamp.power + computer.power;
console.log(`Потребляемая мощность: ${totalPower} Вт.`);