Lære Objekter | Sektion

Stryg for at vise menuen

Objects are a core feature in JavaScript that let you group related data and values together. An object is a collection of properties, where each property has a name (called a key) and a value.

This key-value structure makes objects ideal for representing real-world entities and organizing information in a flexible way. You define an object using curly braces {} and each property is written as a pair: the key (as a string or identifier), followed by a colon, and then the value. Multiple properties are separated by commas.


              12345678
            
// Creating an object to represent a user profile
const userProfile = {
  username: "coder123",
  age: 28,
  email: "coder123@example.com",
  isActive: true
};
console.log(JSON.stringify(userProfile));

You can access the properties of an object using either dot notation or bracket notation. For instance, userProfile.username gives you the value "coder123".


              12345678910111213
            
const userProfile = {
  username: "coder123",
  age: 28,
  email: "coder123@example.com",
  isActive: true
};
console.log(JSON.stringify(userProfile));

// Accessing object properties using dot notation
console.log(userProfile.username); // Dot notation

// Accessing object properties using bracket notation
console.log(userProfile["email"]); // Bracket notation

To update a property, you simply assign a new value: userProfile.age = 29;. If you want to add a new property, just assign it: userProfile.location = "New York";.


              123456789101112131415
            
const userProfile = {
  username: "coder123",
  age: 28,
  email: "coder123@example.com",
  isActive: true
};
console.log(JSON.stringify(userProfile));

// Update the existing 'age' property
userProfile.age = 29;

// Add a new 'location' property
userProfile.location = "New York";

console.log(JSON.stringify(userProfile));

Objects let you organize related data under a single variable, making your code more readable and easier to maintain.

Var alt klart?

Tak for dine kommentarer!

Sektion 1. Kapitel 15

Spørg AI

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

Sektion 1. Kapitel 15