parseInt(null) == parseInt(null)
returns false.
Why? Shouldn't NaN be equal to NaN?
How exactly is NaN implemented in the javascript engine for this to be possible?
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it seems it is like "Does infinity equal to infinity" – asdf_enel_hak Nov 21 '17 at 12:30
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isNaN() is best to test because typeof(NaN)==typeof(42)==true – Alex K. Nov 21 '17 at 12:32
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1We can't use the comparison `=== NaN`, because the value `NaN` is unique in that it does not equal anything. Please see [this](https://javascript.info/number#tests-isfinite-and-isnan). – Ali Soltani Nov 21 '17 at 12:51