Which of the following values is considered falsy 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

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

A). number

B). string

C). boolean

D). undefined

What does it mean that JavaScript is dynamically typed?

A). Variables do not have types

B). Variables can change type

C). Variables must be declared with a type

D). Variables cannot change type

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

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

A). null

B). number

C). undefined

D). object

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

A). number

B). string

C). NaN

D). undefined

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object

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

A). function

B). object

C). undefined

D). method

What is the result of typeof [] in JavaScript?

A). array

B). object

C). list

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