JavaScript Object Reference

Last Updated: 29 Aug, 2024

In JavaScript, objects are a key data type and form the foundation of modern JavaScript. Unlike primitive types (like numbers or strings), objects can store collections of key-value pairs and complex data. You can create them using the Object() constructor or with curly braces called object literals.

What are JavaScript Objects?

JavaScript objects are collections of properties, where each property is defined as a key-value pair. They are used to model real-world entities and complex data structures.

Syntax:

Objects can be created using either the object literal syntax {} or the Object() constructor.

objectName.methodName()

Example: Using function definition as property value and accessing with additional details.

// Object creation
let student = {
    name: "Martin",
    class: "12th",
    section: "A",
 
    studentDetails: function () {
        return this.name + " " + this.class
            + " " + this.section + " ";
    }
};
 
// Display object data
console.log("STUDENT " + student.studentDetails());

Output:

STUDENT Martin 12th A