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 the method parseInt('10.5') return?
A). 5
B). 11
C). 10
D). NaN
What does parseInt('101', 2) return?
A). 5
B). 101
C). NaN
D). 2
Which method converts a number to a string?
A). toFixed()
B). toString()
C). valueOf()
D). parseFloat()
What does Number.isNaN('123') return?
A). 1
B). 0
C). NaN
D). undefined
What is the result of parseInt('0xF', 16)?
A). 15
B). 0
C). NaN
D). 16
Which method returns the primitive value of a Number object?
A). toString()
B). valueOf()
C). toFixed()
D). parseFloat()
What does toPrecision(3) do?
A). Formats a number to 3 decimal places
B). Returns a number in exponential notation
C). Returns a string with a number written with a specified length
D). Converts a number to a string
What does Number('123') return?
A). 123
B). 123
C). NaN
D). 23
What does Number('123abc') return?
A). 123
B). NaN
C). 123abc
D). undefined
What is the output of (255).toString(2)?
A). 255
B). 11111111
C). ff
D). 10