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

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

A). String

B). Object

C). Function

D). Number

Which data type represents unique and immutable values in JavaScript introduced in ES6?

A). Symbol

B). Object

C). Array

D). Function

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 42 in JavaScript?

A). String

B). Boolean

C). Number

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

A). String

B). Number

C). Null

D). Undefined

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

A). Number

B). Boolean

C). String

D). Undefined

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

A). Object

B). Array

C). Function

D). Boolean

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

A). Null

B). Undefined

C). String

D). Number

What is the outcome of typeof undefined in JavaScript?

A). String

B). Undefined

C). Null

D). Number