Introduction to JavaScript Objects

In JavaScript, an object is a container in which we can store multiple pieces of information related to a single entity.

For example, if we want to store a student’s information, we can store their name, age, course, and city in a single object instead of storing them in separate variables.

let student = {
    name: "Rahul",
    age: 20,
    course: "JavaScript",
    city: "Delhi"
};

Here, Student is an object, and all the student-related information is stored in one place.

1. Creating Objects

Curly braces { } are used to create objects.

let student = { 
    name: "Rahul", 
    age: 20 
};

2. Properties

The data stored within an object is called properties.

let student = { 
    name: "Rahul", 
    age: 20 
};

Here:

• name → property
• “Rahul” → property value
• age → property
• 20 → property value

You can use the . dot operator to access the value of a property.

console.log(student.name);
console.log(student.age);

Output:

Rahul 20

3. Methods

The function inside an object is called a method.

let student = {
    name: "Rahul",
    greet: function() {
        console.log("Hello Rahul");
    }
};
student.greet();

Here greet() is a method. Its function is to print “Hello Rahul.”

Remember:

Object = Data + Action

Properties → Data within the object

Methods → Functions/Actions within the object

So, the main purpose of an object is to organize the information and actions associated with it into a single unit.