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

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

A). Number

B). Boolean

C). String

D). Undefined

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

A). String

B). Number

C). Null

D). Undefined

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

A). String

B). Number

C). Array

D). Object

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

A). String

B). Boolean

C). Number

D). Null

Which of the following is a primitive data type in JavaScript?

A). Object

B). Array

C). Function

D). Boolean

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 does NaN represent in JavaScript?

A). Not a Number

B). Infinity

C). Positive Infinity

D). Negative Infinity

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

A). '5'

B). 5

C). '10'

D). 10

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

A). instanceof

B). typeof

C). isInstanceof

D). isTypeOf

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

A). Number

B). String

C). Boolean

D). Undefined