Beginner JavaScript
Q20 / 100

What is NaN in JavaScript?

Correct! Well done.

Incorrect.

The correct answer is B) Not a Number — a numeric value indicating an invalid arithmetic result

B

Correct Answer

Not a Number — a numeric value indicating an invalid arithmetic result

Explanation

NaN is of type "number" but represents invalid computations like 0/0 or parseInt("abc"). Use Number.isNaN() to check (typeof does not work reliably).

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