What will typeof null 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 of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

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

A). null

B). number

C). undefined

D). object

What does the parseInt function do in JavaScript?

A). Converts a number to a string

B). Converts a string to an integer

C). Converts a boolean to a number

D). Converts an array to a number

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

A). number

B). string

C). NaN

D). undefined

What does the isNaN function do?

A). Checks if a value is not a number

B). Converts a value to a number

C). Checks if a value is a number

D). Converts a value to NaN

Given the code: let y = 10; y = true;, what is the type of y after execution?

A). number

B). boolean

C). string

D). object

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

A). function

B). object

C). undefined

D). method

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object

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

A). typeof

B). instanceof

C). type

D). isType