JavaScript Fundamentals and Concepts

In this video, Claire introduces JavaScript, a scripting language essential for adding dynamic functionality to web pages. She covers basic concepts such as variables, events, functions, and conditional statements. Claire demonstrates these concepts through a practical example involving a button and a box, showing how to manipulate the DOM using JavaScript. The video concludes with a discussion on using functions and conditionals to create dynamic effects, providing a foundational understanding of JavaScript for further learning.

What is the primary purpose of JavaScript in web development?

• To style web pages

• To manage databases

• To add dynamic functionality and interaction

• To structure web content

Which of the following best describes a variable in JavaScript?

• A CSS property

• A container for storing data

• A fixed value

• A type of event

What is an event in JavaScript?

• A function call

• A CSS style

• A user interaction like clicking or scrolling

• A variable declaration

How do you link an external JavaScript file to an HTML document?

• Using a style tag

• Using a script tag with a src attribute

• Using a link tag

• Using a meta tag

Where is it recommended to place the script tag in an HTML document?

• In the footer tag

• At the top of the body tag

• In the head tag

• At the bottom of the body tag

What does the querySelector method do in JavaScript?

• Selects the first element that matches a CSS selector

• Selects an HTML element by its ID

• Selects all elements with a specific class

• Selects an element by its tag name

Which method is used to select an element by its ID in JavaScript?

• getElementsByTagName

• getElementById

• querySelector

• getElementsByClassName

What is the purpose of an if-else statement in JavaScript?

• To declare variables

• To define functions

• To handle events

• To execute code based on a condition

Which operator is used for comparison in JavaScript?

• !=

• ===

• ==

• =

What happens when the condition in an if statement is false?

• The code inside the else block is executed

• The code inside the if block is executed

• The program stops

• The condition is re-evaluated