What will typeof NaN return in JavaScript?

What will be the result of the following code: let z = '123'; z = Number(z); console.log(typeof z);?

A). string

B). number

C). undefined

D). boolean

Which operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

What is the initial type of a variable declared with let a;?

A). null

B). number

C). undefined

D). object

What will typeof null return in JavaScript?

A). null

B). undefined

C). object

D). number

What will be the result of typeof function() {} in JavaScript?

A). function

B). object

C). undefined

D). method

In JavaScript, what will be the type of a variable x after x = 5 + true;?

A). number

B). string

C). boolean

D). undefined

What happens when you add a number and a string in JavaScript?

A). An error is thrown

B). The number is converted to a string

C). The string is converted to a number

D). Both are converted to boolean

What is the type of the value returned by parseFloat('3.14abc')?

A). number

B). string

C). NaN

D). undefined

Which of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

What is the result of typeof [] in JavaScript?

A). array

B). object

C). list

D). undefined