Objects

An object stores key/value pairs — instead of numbered positions like an array, each value has a named key.

Syntax

const user = { name: "Ada", age: 25 };

Example

console.log(user.name);
user.age = 26;
for (const key in user) {
    console.log(key, user[key]);
}

Expected output

Ada
name Ada
age 26

Use object.property (dot notation) when the key name is known ahead of time, or object["property"] (bracket notation) when it's stored in a variable.

Practice

Create an object representing a book with title and author properties, then log `${title} by ${author}`.

const book = { title: "Dune", author: "Frank Herbert" };
console.log(`${book.title} by ${book.author}`);