What is the data type of 42 in JavaScript?

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 result of null === undefined?

A). 1

B). 0

C). Error

D). NaN

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

A). String

B). Number

C). Object

D). Boolean

What is the output of typeof function() {}?

A). function

B). object

C). undefined

D). number

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

A). ==

B). !=

C). ===

D). !==

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

A). array

B). object

C). number

D). list

What is the data type of an array in JavaScript?

A). Array

B). Object

C). Collection

D). List

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

A). toString()

B). parseInt()

C). String()

D). Number()

Which symbol is used to denote a string template literal?

A). ''

B).

C). ``

D). {}

What is the output of '5' + 3?

A). 8

B). 53

C). 8

D). Error