Answer & Solution
Answer: Option A
Solution:
The isNaN() function checks if a value is NaN. isNaN('Hello') returns true because 'Hello' is not a number.
Q
What is the result of isNaN('Hello')?
Related Questions on Average
What does (123.456).toFixed(1) return?
A). 4
B). 5
C). 45
D). 123
Which method returns the primitive value of a Number object?
A). toString()
B). valueOf()
C). toFixed()
D). parseFloat()
What does Number('123') return?
A). 123
B). 123
C). NaN
D). 23
What does parseInt('101', 2) return?
A). 5
B). 101
C). NaN
D). 2
What is the output of (255).toString(2)?
A). 255
B). 11111111
C). ff
D). 10
Which method returns a number in exponential notation?
A). toFixed()
B). toExponential()
C). toPrecision()
D). toString()
What does Number('123abc') return?
A). 123
B). NaN
C). 123abc
D). undefined
Which method would you use to check if a value is a finite number?
A). isNaN()
B). isFinite()
C). Number()
D). toFixed()
What does parseFloat('12.34abc') return?
A). 12
B). 34
C). NaN
D). undefined
What does the method parseInt('10.5') return?
A). 5
B). 11
C). 10
D). NaN