Q
What does Number.isNaN('123') return?

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.
Related Questions on Average

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

Which method can convert a number to a different base (e.g., hexadecimal)?

A). toString()

B). parseInt()

C). toFixed()

D). valueOf()

Which method converts a string to a floating point number?

A). parseFloat()

B). toFixed()

C). toPrecision()

D). Number()

What is the output of (255).toString(2)?

A). 255

B). 11111111

C). ff

D). 10

What does isFinite(123) return?

A). 1

B). 0

C). NaN

D). undefined

What does Number.isInteger(123.45) return?

A). 1

B). 0

C). NaN

D). undefined

What does parseFloat('12.34abc') return?

A). 12

B). 34

C). NaN

D). undefined

Which method returns a number in exponential notation?

A). toFixed()

B). toExponential()

C). toPrecision()

D). toString()

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