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

Which method can be used to convert a string to a number in JavaScript?

A). parseInt()

B). toString()

C). toNumber()

D). parseStr()

What is the result of null === undefined?

A). 1

B). 0

C). Error

D). NaN

What is the output of typeof null?

A). null

B). undefined

C). object

D). number

What will typeof NaN return?

A). number

B). NaN

C). undefined

D). object

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

A). array

B). object

C). number

D). list

How do you declare a variable with an undefined value?

A). let x;

B). let x = '';

C). let x = 0;

D). let x = null;

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

A). toString()

B). parseInt()

C). String()

D). Number()

What is the result of typeof Symbol('id')?

A). symbol

B). object

C). string

D). undefined

What is the data type of 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Object

What is the output of '5' + 3?

A). 8

B). 53

C). 8

D). Error