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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.
Main question: What is a NaN value or NaN exactly (in the words of a non-math professor)? Furthermore i have a few questions about the whole circumstance, which giving me complaints in understanding what a NaN should be, which are not necessary to answer my main question but desired: What are operations which causing a NaN value as result?
What is NaN (Not a Number) in the words of a beginner?
It actually makes sense, because "A" is actually not a number. But what we really want to check is if myVar is exactly of value NaN. So isNaN () cannot help. Then what should we do instead? In the light that NaN is the only JavaScript value that is treated unequal to itself, so we can check for its equality to itself using !==
float('nan') represents NaN (not a number). But how do I check for it?
62 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. You're comparing the same two objects. If you tried the same thing with two different nan s, you'd get False:
Why in numpy nan == nan is False while nan in [nan] is True?