๐ขNaN
not a number.
JS โฉ scope โฉ global โฉ global object โฉ property โฉ NaN
( non-configurable, non-writable global object property )โ
a property of the global object. (that is, a variable in global scope).
equivalent to Number.NaN.
NaN
is the only value that doesn't equal to itselfโ
trichotomy law๏ผ a < b, a = b, a > b
doesn't apply to NaNโ
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