JavaScript Core | VoidX Academy

9. Objects

Data Structures

Objects

While arrays are ordered lists, Objects store data in Key-Value pairs. They are the cornerstone of representing real-world entities in code.

📚 Object Creation & Access

const player = {
    username: "GhostUser",
    level: 42,
    isOnline: true
};

// Dot notation (Standard)
console.log(player.username);

// Bracket notation (Used when the key is dynamic)
const keyToFind = "level";
console.log(player[keyToFind]);

OutputGhostUser
42

✏️ Modifying Objects

const server = { name: "Main DB", status: "Active" };

// Updating a value
server.status = "Maintenance";

// Adding a new key-value pair
server.ip = "192.168.1.1";

console.log(server);

Output{ name: 'Main DB', status: 'Maintenance', ip: '192.168.1.1' }

🏗️ Nested Objects & Methods

Objects can contain other objects, and they can even contain functions (which are called "Methods").

const company = {
    name: "VoidX",
    ceo: {
        name: "Prince",
        city: "Tarkwa"
    },
    greet: function() {
        return "Welcome to " + this.name;
    }
};

console.log(company.ceo.city);
console.log(company.greet());

OutputTarkwa
Welcome to VoidX

9. Objects

Objects

📚 Object Creation & Access

✏️ Modifying Objects

🏗️ Nested Objects & Methods

Knowledge Check

9. Objects

Objects

📚 Object Creation & Access

✏️ Modifying Objects

🏗️ Nested Objects & Methods

Knowledge Check