Which of the following is a falsy value 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 method can be used to convert a string to a number in JavaScript?

A). parseInt()

B). toString()

C). toNumber()

D). parseStr()

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

A). ==

B). !=

C). ===

D). !==

What is the output of '5' - 3?

A). 2

B). 2

C). 53

D). Error

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 '5' + 3?

A). 8

B). 53

C). 8

D). Error

What will typeof NaN return?

A). number

B). NaN

C). undefined

D). object

What is the data type of true in JavaScript?

A). String

B). Boolean

C). Number

D). Object

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

A). symbol

B). object

C). string

D). undefined

What is the output of typeof null?

A). null

B). undefined

C). object

D). number