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- floating point - Why is NaN not equal to NaN? - Stack Overflow
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 sensible answer Otherwise by identity NaN NaN should equal 1, along with all the other consequences like (NaN NaN)==1, (NaN*1)==NaN, etc
- What is NaN (Not a Number) in the words of a beginner?
What is a NaN value or NaN exactly (in the words of a non-math professor)? Let's suppose you're working with real numbers - numbers like 1, π, e, -137, 6 626, etc In the land of real numbers, there are some operations that usually can be performed, but sometimes don't have a defined result For example, let's look at logarithms
- 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 always test if a value is NaN by checking it for equality to itself:
- Whats the difference between nan, NaN and NAN - Stack Overflow
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?
- python - How to check for NaN values - Stack Overflow
float('nan') represents NaN (not a number) But how do I check for it?
- javascript - Why is NaN === NaN false? - Stack Overflow
JavaScript automatic type conversion convert NaN into number, so checking if a number is not a number will always b false and NaN !== NaN will be true
- javascript - ¿Por qué NaN != NaN? - Stack Overflow en español
Tenía tiempo programando en JavaScript y nunca me había dado cuenta de esa peculiaridad que tiene con el valor NaN Decidí investigar y lo más que encontré fue: NaN - JavaScript | MDN [inglés]
- javascript - Is NaN equal to NaN? - Stack Overflow
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
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