Introduction to JavaScript

Which of the following is not a number data type in JavaScript?

• -50

• 20.04

• -1292.38101

• "123"

How do comments look like in JavaScript?

• //

• @@

• &&

• **

Can you change the value of a const?

• Yes

• No

How many options can a boolean variable have?

• 1

• 2

• 3

• 4

Can variables change their type in JavaScript?

• Yes

• No

Which of the following is an invalid string?

• "Hello"

• `Hello`

• "Hello'

• 'Hello'

What is the index of the letter G in 'VIBGYOR'?

• 1

• 2

• 3

• 4

Which string method makes text uppercase in JavaScript?

• .toUpperCase()

• .TOUPPERCASE()

• .UpperCase()

• .ToUpperCase()

What does the string method .trim() do?

• Removes all text

• Removes all whitespace

• Removes a specific part of the text

• Replaces whitespaces

What is the output of "Hello".indexOf('l')

• 3

• 4

• -1

• 2