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

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

A). Object

B). Array

C). Function

D). Boolean

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

A). String

B). Boolean

C). Number

D). Null

Which data type represents positive infinity in JavaScript?

A). Infinity

B). Number

C). NaN

D). Null

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 unique and immutable values in JavaScript introduced in ES6?

A). Symbol

B). Object

C). Array

D). Function

What is the result of 0 / 0 in JavaScript?

A). Infinity

B). 0

C). NaN

D). 1

Which of these is a complex or reference data type in JavaScript?

A). Number

B). Boolean

C). Object

D). String

What is the outcome of typeof undefined in JavaScript?

A). String

B). Undefined

C). Null

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

A). '5'

B). 5

C). '10'

D). 10