The Front-End Web Developer Bootcamp - HTML, CSS, JS, and React - classList Method

The video tutorial covers five methods for manipulating CSS classes using JavaScript. It begins with an introduction to adding and removing classes through events, demonstrating how to create and remove classes dynamically. The tutorial then explores the length and toggle methods, showing how to measure the number of classes and toggle them on and off. Finally, it discusses the contain and item methods, which check for the presence of classes and retrieve class names by index. The tutorial emphasizes practical examples and debugging techniques using the console.

What is the primary purpose of using events to add classes in JavaScript?

• To create new CSS styles

• To change the HTML structure

• To dynamically apply styles based on user interaction

• To remove existing styles

How can you remove a class from an element using JavaScript?

• By using the 'delete' method

• By using the 'erase' method

• By using the 'remove' method

• By using the 'clear' method

What does the 'length' method return when used on a class list?

• The total number of elements

• The number of styles in the CSS file

• The number of classes applied to an element

• The length of the class name

What is the function of the 'toggle' method in JavaScript?

• To permanently add a class

• To switch between adding and removing a class

• To change the class name

• To permanently remove a class

How does the 'item' method function in relation to class lists?

• It removes a class

• It retrieves a class by its index

• It checks if a class exists

• It adds a new class

What does the 'contains' method return when a class is present?

• The index of the class

• False

• True

• The class name

Which method is most important for adding and removing classes with a single click?

• Length

• Contains

• Toggle

• Item