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Aptitude | JavaScript Course Quiz 3 | Question 10

  • Last Updated : 10 May, 2019

What will be the output of the following code?

 document.write(NaN == NaN);

(A) true
(B) false
(C) 1
(D) 0

Answer: (B)

Explanation: Equality operator (== and ===) cannot be used to test a value against NaN. Use Number.isNaN() or isNaN() instead.
Hence, it is not equal.

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