Answer & Solution
Answer: Option B
Solution:
The Number.isNaN() method determines whether the passed value is NaN. Number.isNaN('123') returns false because '123' is not NaN.
Q
What does Number.isNaN('123') return?
Related Questions on Average
What does Number.isInteger(123.45) return?
A). 1
B). 0
C). NaN
D). undefined
Which method converts a number to a string?
A). toFixed()
B). toString()
C). valueOf()
D). parseFloat()
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 result of isNaN('Hello')?
A). 1
B). 0
C). NaN
D). undefined
What is the result of parseInt('0xF', 16)?
A). 15
B). 0
C). NaN
D). 16
What is the output of (255).toString(2)?
A). 255
B). 11111111
C). ff
D). 10
Which method would you use to check if a value is a finite number?
A). isNaN()
B). isFinite()
C). Number()
D). toFixed()
What does (123.456).toFixed(1) return?
A). 4
B). 5
C). 45
D). 123