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 Number('123') return?
A). 123
B). 123
C). NaN
D). 23
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 isFinite(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 is the result of parseInt('0xF', 16)?
A). 15
B). 0
C). NaN
D). 16
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()
What does Number.isInteger(123.45) return?
A). 1
B). 0
C). NaN
D). undefined
Which method returns a number in exponential notation?
A). toFixed()
B). toExponential()
C). toPrecision()
D). toString()
What is the output of (255).toString(2)?
A). 255
B). 11111111
C). ff
D). 10