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// проверка на NaN | |
/* | |
NaN является | |
единственным JavaScript-значением, которое считается | |
неравным самому себе, вы всегда можете протестировать | |
переменную на значение NaN путем проверки ее на нера- | |
венство самой себе: | |
*/ | |
function isReallyNaN(x) { | |
return x !== x; | |
} |
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