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

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

A). Number

B). String

C). Boolean

D). Undefined

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

A). Array

B). Symbol

C). Map

D). Tuple

Which operator checks if an object is an instance of a specific object type in JavaScript?

A). instanceof

B). typeof

C). isInstanceof

D). isTypeOf

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

A). String

B). Object

C). Function

D). Number

What is the result of 0 / 0 in JavaScript?

A). Infinity

B). 0

C). NaN

D). 1

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

A). Number

B). Boolean

C). String

D). Undefined

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

A). '5'

B). 5

C). '10'

D). 10

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

A). Null

B). Undefined

C). String

D). Number

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'

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

A). String

B). Number

C). Null

D). Undefined