Question

Which of the following method checks if its argument is not a number?

a) isNaN()

b) nonNaN()

c) NaN()

d) None of the above

Answer 1

Answer:-  A

reason:-The Number.isNaN() method determines whether a value is NaN (Not-A-Number). This method returns true if the value is of the type Number, and equates to NaN. Otherwise it returns false.