Answer & Solution
Answer: Option A
Solution:
The isNaN function determines if a value is NaN (Not-a-Number).
Q
What does the isNaN function do?
Related Questions on Average
What will be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
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 NaN return in JavaScript?
A). number
B). NaN
C). undefined
D). object
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
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
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What is the type of the value returned by JSON.parse('null')?
A). null
B). string
C). object
D). undefined
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined
What is the type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType