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A comment on WTFJS – a list of funny and tricky JavaScript examples. Parent comment

Re:WTFJS – a list of funny and tricky JavaScript examples by goatlover on Monday July 31, 2017 @11:02AM (#14892625)
How is isNaN() implemented?
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Re:WTFJS – a list of funny and tricky JavaScript examples by Gaelan on Monday July 31, 2017 @11:21AM (#14892804) 

    function isNaN(x) { return x !== x }
It’s a native browser function so it may not actually be done that way, but that’s one way you could do it.
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