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NaN shits (javascript)
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| NaN==NaN // false, wtf? | |
| isNaN(NaN) // true | |
| isNaN(0/0) // true | |
| isNaN(10) // false | |
| isNaN("10") // false | |
| isNaN("any string that can't become number") // true | |
| isNaN(true) // false | |
| isNaN(false) // false | |
| typeof NaN === 'number' // true |
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isNaN(function() { return 55 }) // true
isNaN([1, 2, 3]) // true
So their logic works "most of the time" but not all of the time such as when you do 0/0. if you typeof (0/0) === "number" that will return true since 0/0 = 0 and 0 is a number.