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

What is the outcome of typeof undefined in JavaScript?

A). String

B). Undefined

C). Null

D). Number

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

A). Object

B). Array

C). Function

D). Boolean

What will let x = null; console.log(typeof x); output in JavaScript?

A). Object

B). Null

C). Undefined

D). Number

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

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 undefined in JavaScript?

A). Number

B). Boolean

C). String

D). Undefined

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

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

A). Number

B). Boolean

C). Object

D). String