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 parseInt('101', 2) return?
A). 5
B). 101
C). NaN
D). 2
What does Number.isNaN('123') return?
A). 1
B). 0
C). NaN
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 isFinite(123) return?
A). 1
B). 0
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 returns a number in exponential notation?
A). toFixed()
B). toExponential()
C). toPrecision()
D). toString()
Which method converts a number to a string?
A). toFixed()
B). toString()
C). valueOf()
D). parseFloat()
What is the result of parseInt('0xF', 16)?
A). 15
B). 0
C). NaN
D). 16
Which method converts a string to a floating point number?
A). parseFloat()
B). toFixed()
C). toPrecision()
D). Number()
What does Number('123') return?
A). 123
B). 123
C). NaN
D). 23