NaN与任何其他值（包括NaN本身）进行比较的结果都是false，包括NaN == NaN。 这是因为NaN被定义为不等于任何其他值，甚至不等于它自己。 这是由于NaN的特殊性质导致的。 NaN的比较结果 …

float('nan') represents NaN (not a number). But how do I check for it?

Apr 16, 2010 · 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 …

Dec 14, 2019 · 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 …

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 is an …

Nov 6, 2013 · It seems that the IEEE 754 standard defines 16,777,214 32-bit floating point values as NaNs, or 0.4% of all possible values. I wonder what is the rationale for reserving so many useful …

Apr 11, 2010 · 16 NaN means "Not a Number" and is the result of undefined operations on floating point numbers like for example dividing zero by zero. (Note that while dividing a non-zero number by zero …

Jul 24, 2013 · 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?

Aug 8, 2011 · 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.

May 14, 2018 · What is the difference between Null, NaN and undefined in JavaScript? I have come across all three values, and have understood them to be “there isn’t anything here” in the context I …