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 isFinite(123) return?
A). 1
B). 0
C). NaN
D). undefined
What does Number.isNaN('123') return?
A). 1
B). 0
C). NaN
D). undefined
What does Number('123') return?
A). 123
B). 123
C). NaN
D). 23
Which method can convert a number to a different base (e.g., hexadecimal)?
A). toString()
B). parseInt()
C). toFixed()
D). valueOf()
What does parseFloat('12.34abc') return?
A). 12
B). 34
C). NaN
D). undefined
How do you format a number to two decimal places?
A). toFixed(2)
B). toExponential(2)
C). toPrecision(2)
D). toString(2)
Which method would you use to check if a value is a finite number?
A). isNaN()
B). isFinite()
C). Number()
D). toFixed()
What is the output of (255).toString(2)?
A). 255
B). 11111111
C). ff
D). 10
What does (123.456).toFixed(1) return?
A). 4
B). 5
C). 45
D). 123
Which method converts a number to a string?
A). toFixed()
B). toString()
C). valueOf()
D). parseFloat()