Is NaN equal to NaN?

Question

parseFloat(\"NaN\")

returns \"NaN\", but

parseFloat(\"NaN\") == \"NaN\"

returns false. Now, that\'s probably a go

Answer 1

When a JavaScript function returns NaN, this is not a literal string but an object property in the global space. You cannot compare it to the string "NaN".

See https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/NaN