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How do you check that a number is NaN in JavaScript?

182 I just came across this technique in the book Effective JavaScript that is pretty simple: Since NaN is the only JavaScript value that is treated as unequal to itself, you can

2025 Oct 03

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floating point

NaN is designed to propagate through all calculations, infecting them like a virus, so if somewhere in your deep, complex calculations you hit upon a NaN, you don''t bubble out a seemingly

2024 Aug 06

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python

nan stands for Not A Number, and this is not equal to 0. Although positive and negative infinity can be said to be symmetric about 0, the same can be said for any value n,

2025 Sep 27

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What is the difference between NaN and NA?

I would like to know why some languages like R has both NA and NaN. What are the differences or are they equally the same? Is it really needed to have NA?

2025 May 10

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Why in numpy `nan == nan` is False while nan in [nan] is True?

nan not being equal to nan is part of the definition of nan, so that part''s easy. As for nan in [nan] being True, that''s because identity is tested before equality for containment in lists.

2024 Jul 30

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javascript

37 It''s a special case, NaN is the only thing in Javascript not equal to itself. Although the other answers about strings vs the NaN object are right too.

2025 Jul 10

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What''s the difference between nan, NaN and NAN

In numpy there are nan, NaN and NAN. What''s the sense of having all three, do they differ or any of these can be used interchangeably?

2024 Mar 12

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What is the difference between NaN and None?

NaN can be used as a numerical value on mathematical operations, while None cannot (or at least shouldn''t). NaN is a numeric value, as defined in IEEE 754 floating-point standard. None

2025 Nov 02

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