JavaScript Fundamentals

JavaScript brings webpages to life. You can update the DOM, respond to user actions, process data, and connect with external APIs.

Logic DOM Events

Key Concepts

Store and update values using let and const for strings, numbers, arrays, and objects.

Encapsulate reusable logic and call it with different inputs.

Select elements, update content, and react to clicks, typing, and form submissions.

Answer all questions and click submit to see your score.

1. Which keyword creates a block-scoped variable?

let var only define

2. What does DOM stand for?

Data Object Model Document Object Model Dynamic Output Method

3. Which method selects an element by id?

queryElements getElementById selectById

4. Which event fires when a button is pressed?

click hover loadend

5. Which array method creates a new array of transformed values?

map forEach push