Object Methods:
===============
1) assign():
============
==> It is an Object method
	which we can to create the new Object by copying the data from another object.
Syntax:
	Object.assign(target, source)

// User Profile
let userProfile = {
    name : "Ishika",
    mail : "ishika.jain@gmail.com",
    age : 30
}

// Update with new information
let updatedInfo = {
    mail : "jain.ishika@gmail.com",
    phone: "123-456-7890"
}

// new object with existing profile and updated informarion
let updatedUserProfile = Object.assign({},userProfile,updatedInfo)

console.log(userProfile);
console.log(updatedUserProfile);
=================================================
const defaultSettings = {
    theme : "dark",
    notifications : true,
    autoSave:true
};

const userSettings = {
    theme : "light",
    autoSave:false
};

const finalSettings = Object.assign({},defaultSettings,userSettings);

console.log(finalSettings);
=======================================================
2) entries():
=============
==> Object Method
==> return: an array of key-value pairs.

// User profile show as report.

const userProfile = {
    name : "Sachin",
    age : 30,
    mail : "sachin.josh@gmail.com",
    location : "Delhi"
};


console.log("The User Profile is = ");
console.log(userProfile);

console.log("The User Profile as Report:");

Object.entries(userProfile).forEach(([key,value]) =>{
    console.log(`${key.toUpperCase()} : ${value}`);
});

console.log(Object.entries(userProfile));

====================================================

fromEntries():
=============
==> Object method
==> create an object from list of key-value pairs.

// URL with Query Parameters ===> convert into Object
const queryString = '?name = John&age = 30&country = USA';
const queryParams = queryString.substring(1).split('&').map(param => param.split('='));

console.log(queryString);
console.log(queryParams);
const queryObject = Object.fromEntries(queryParams);
console.log(queryObject);
==================================================
Setter and Getter method:
=========================

==> JavaScript is kind of an Object Oriented Programming Language.
High-level Languages
	1) Functional Programming Languages/Procedural Programming languages
	2) Object Based Programming Languages
	3) Object Oriented Programming Languages
{
	line1;
	line2;
	line3;
	functions{	
	}
}

Object Oriented Programming System (OOPs)
=========================================
Concepts:
	class, Object, methods, constructor

principles:
	Encapsulation
	polymorphism
	inheritance
	abtsraction


==> to initialize the private data members of class, we can use "setters and getters" methods.
setter ==> setter can set the value for private variable
getter ==> used to get the value of private variable.
Note:
====
In JavaScript, there are no keywords available to denote access modifiers.
public data can be used without the prefixing of any symbol.
private data name can be prefixed with '_'
protected data name can be prefixed with '__'.

class ==> a blueprint
	collection of data members and methods
	==> logical entity.

object ==> a physical entity
	a reference/instance for the class.

// user profile
class UserPofile{
    constructor(firstName,lastName,age){
        // a constructor can be invoke at the time of object creation for a class.
        this.firstName = firstName;
        this.lastName = lastName;
        this._age = age; // private data member
        // to differentiating the local variable and class variable, this keyword can be used with class variables.
        // here: firstName, lastName and age ==> local variables
        // where as this.firstName, this.lastName and this.age ==> class variables/Instance Variables.
    }
    // getter method for fullName
    get fullName(){
        return `${this.firstName}${this.lastName}`
    }
    
    //setter method for full name
    set fullName(name){
        const[first,last] = name.split(" ");
        this.firstName = first || "";
        this.lastName = last || "";
    }
    // fullName is the property was added newly into UserProfile class.
    
    //getter method for private member age (existing)
    get age(){
        return this._age;
    }
    //setter method for private member age
    set age(value){
        if(value > 0 && value < 120){
            this._age = value;
        }
        else{
            console.error("Invalid age! Age must be between 1 to 120.");
        }
    }
}

// creation of an object
const user = new UserPofile("Ishika","Jain",26);
console.log(user.fullName);
console.log(user.age);
// update on the UserProfile Class Property.
user.fullName = "Jain Ishika";
console.log(user.fullName);

user.age = 30;
console.log(user.age);

user.age = -10;
console.log(user.age);