What will typeof [1, 2, 3] return?

What is the data type of an array in JavaScript?

A). Array

B). Object

C). Collection

D). List

Which operator checks both value and type for equality in JavaScript?

A). ==

B). !=

C). ===

D). !==

What will typeof NaN return?

A). number

B). NaN

C). undefined

D). object

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

A). String

B). Number

C). Object

D). Boolean

Which function can convert a number to a string in JavaScript?

A). toString()

B). parseInt()

C). String()

D). Number()

What is the output of typeof null?

A). null

B). undefined

C). object

D). number

What is the data type of 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Object

What is the result of null === undefined?

A). 1

B). 0

C). Error

D). NaN

How do you declare a variable with an undefined value?

A). let x;

B). let x = '';

C). let x = 0;

D). let x = null;

What is the output of '5' - 3?

A). 2

B). 2

C). 53

D). Error