this is semantic wrong but it's valid....
isNaN(undefined) // true // Correct way Number.isNaN(undefined) //false
This makes sense if you assume isNaN means is Not a number, and not is the nan value!
isNaN
is Not a number
is the nan value
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this is semantic wrong but it's valid....
This makes sense if you assume
isNaNmeansis Not a number, and notis the nan value!