Which data type represents a block of reusable code in JavaScript?

Which data type represents an intentional absence of any value in JavaScript?

A). Null

B). Undefined

C). String

D). Number

What is the data type of the value 'null' (with quotes) in JavaScript?

A). String

B). Number

C). Null

D). Undefined

What will be the result of typeof 'hello' in JavaScript?

A). String

B). Number

C). Undefined

D). Function

What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?

A). '105'

B). 105

C). 15

D). '15'

Which data type represents positive infinity in JavaScript?

A). Infinity

B). Number

C). NaN

D). Null

What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?

A). '5'

B). 5

C). '10'

D). 10

What is the outcome of typeof [1, 2, 3] in JavaScript?

A). String

B). Number

C). Array

D). Object

What is the result of 0 / 0 in JavaScript?

A). Infinity

B). 0

C). NaN

D). 1

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

A). Array

B). Symbol

C). Map

D). Tuple

What is the data type of the value 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Null