JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Variables, Constants, and Comments / 007

The video tutorial introduces JavaScript concepts, focusing on setting up a coding environment with dark mode and detachable console. It explains variables, including 'let' and 'constant', and their mutability. The tutorial covers variable operations, assignments, and error handling. It also discusses the deprecated 'var' keyword and the use of comments in code, both single-line and multi-line, to enhance code readability and maintainability.

What is the purpose of changing the theme to dark mode in the JavaScript setup?

• To increase screen brightness

• To improve code readability

• To reduce eye strain

• To enhance the aesthetic appeal

Which keyword is used to declare a variable that can be updated later in JavaScript?

• const

• let

• var

• update

What happens if you try to change the value of a 'const' variable?

• The value remains unchanged without error

• An error is thrown

• The value changes successfully

• The program crashes

In JavaScript, what is the flow of execution?

• Top to bottom

• Bottom to top

• Left to right

• Random order

What is the term used for assigning a value to a variable in JavaScript?

• Declaration

• Definition

• Initialization

• Assignment

What is the main reason to avoid using the 'var' keyword in modern JavaScript?

• It is slower than 'let' and 'const'

• It requires more memory

• It is not supported in all browsers

• It can lead to unexpected behavior due to hoisting

Which keyword was used before 'let' and 'const' were introduced in JavaScript?

• var

• int

• float

• string

Which of the following is a correct way to comment a single line in JavaScript?

• /* comment */

• // comment

• # comment

How can you comment multiple lines in JavaScript?

• Using # at the start of each line

• Using to end the comment

• Using /* to start and */ to end the comment

• Using // at the start of each line

What is the purpose of comments in JavaScript code?

• To execute hidden code

• To provide explanations or notes

• To change variable values

• To increase code execution speed