Which of the following is not a primitive data type 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;

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

A). toString()

B). parseInt()

C). String()

D). Number()

What is the data type of an array in JavaScript?

A). Array

B). Object

C). Collection

D). List

What is the result of null === undefined?

A). 1

B). 0

C). Error

D). NaN

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

A). array

B). object

C). number

D). list

What will typeof NaN return?

A). number

B). NaN

C). undefined

D). object

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

A). symbol

B). object

C). string

D). undefined

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

A). function

B). object

C). undefined

D). number

What is the data type of 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Object

Which symbol is used to denote a string template literal?

A). ''

B).

C). ``

D). {}