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

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 the following is not a valid data type in JavaScript?

A). Array

B). Symbol

C). Map

D). Tuple

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'

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

A). Number

B). Boolean

C). Object

D). String

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 an intentional absence of any value in JavaScript?

A). Null

B). Undefined

C). String

D). Number

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

A). Symbol

B). Object

C). Array

D). Function

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

A). Object

B). Array

C). Function

D). Boolean