const person = {

firstName: "John",

lastName: "Doe",

age: 30,

isStudent: false

};

console.log(person.firstName)

// class and object

class client{

info(){

console.log("welcome to p4n.in");

}

}

// call from object

obj = new client();

obj.info();

// object create method Object.create()

const animal = {

type: "Mammal",

sound: "Roar"

};

const lion = Object.create(animal);

lion.name = "Simba";

console.log(lion.name)

console.log(lion.type)

// Object Methods

const calculator = {

add: function(a, b) {

return a + b;

},

subtract: function(a, b) {

return a - b;

}

};

console.log(calculator.add(5, 3)); // 8

console.log(calculator.subtract(8, 2)); // 6

const p4n_calculator = {

gst: function(price, gst) {

finalprice = price*gst/100

finalprice = price+finalprice

console.log("final price : "+finalprice)

}

};

p4n_calculator.gst(1200,18);

// Object Properties and Methods

const student = {

firstName: "Alice",

lastName: "Smith",

age: 20,

greet: function() {

console.log(`Hello, I'm ${this.firstName} ${this.lastName}.`);

}

};

student.greet(); // "Hello, I'm Alice Smith."

// Object Iteration

const person1 = {

name: "John",

age: 20,

};

console.log(person1);

for (let key in person1) {

console.log(key, person1[key]);

}

person1.age = 33;

for (let key in person1) {

console.log(key, person1[key]);

}

const keys = Object.keys(person1);

const values = Object.values(person1);

const entries = Object.entries(person1);