What will typeof NaN return in JavaScript?
A). number
B). NaN
C). undefined
D). object
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). {}
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 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 will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType
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
Which type conversion happens automatically in the expression 3 + '5'?
A). Number to String
B). String to Number
C). Boolean to String
D). Number to Boolean