OBJECTS IN JAVASCRIPT PART-2

CRUD operations in JS:

• CRUD operations in JavaScript allow you to Create, Read, Update, and Delete data.
• These operations are fundamental for managing data in applications.

1. Create:
To create an object or add properties to an existing object:
example:
const user = {
name: "John",
age: 30
};
user.email = "[e-mail]";
console.log(user);
output:
{name: 'John', age: 30, email: '[e-mail]'}

2. Read:
To access properties of an object:
example:
const user = {
name: "John",
age: 30,
email: "[e-mail]"
};
// Using Dot Notation
console.log(user.name);
// Using Bracket Notation
console.log(user["email"]);
// Destructuring(TBD)
const { name, age } = user;
console.log(name, age);
output:
John
[e-mail]
John 30

3. Update:
To modify existing properties:
example:
const user = {
name: "John",
age: 30,
email: "[e-mail]"
};
user.age = 35;
user["email"] = "[e-mail]";
console.log(user);
output:
{name: 'John', age: 35, email: '[e-mail]'}

4. Delete:
To remove properties from an object:
example:
const user = {
name: "John",
age: 30,
email: "[e-mail]"
};
delete user.email;
console.log(user);
output:
{name: 'John', age: 30}

CONSTRUCTORS:

• In JavaScript, a constructor is a special function used to create and initialize objects.
• It’s typically used with the new keyword to produce multiple objects of the same type.
• constructor function names start with an uppercase letter.
• this inside the constructor refers to that new current object.
• This approach is useful when you need to create many objects with similar properties and methods.

example:
function Laptop(price,brand,storage,ram){
this. price = price;
this. brand = brand;
this. storage = storage;
this. ram = ram;
}
const hp01 = new Laptop(40000,"hp",512,8);
const lenovol1 = new Laptop(50000,"lenovo",1000,16);
const asusvivobook = new Laptop(48000,"asus",516,16);
const delld5 = new Laptop(45000,"dell",256,8);
console.log(hp01);
console.log(asusvivobook.ram);
console.log(lenovol1["price"])
output:
Laptop {price: 40000, brand: 'hp', storage: 512, ram: 8}
16
50000