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Definition: isfinite is a global method that can be used to test for a number being too big for Javascript to handle. Unlike testing against Infinity directly which only allows you to test for a positive number overflow condition, using this method also tests for -Infinity. This is not a reserved word so you can declare your own variable or function called isfinite but if you do then you will not be able to use this method.
if (isfinite(x))
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