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103

How do I check if a number evaluates to infinity?

rated 0 times [ 104] [ 1] / answers: 1 / hits: 74375 / 14 Years ago, tue, january 18, 2011, 12:00:00

I have a series of Javascript calculations that (only under IE) show Infinity depending on user choices.

How does one stop the word Infinity appearing and for example, show 0.0 instead?

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answered 14 Years ago darrell · Accepted Answer

if (result == Number.POSITIVE_INFINITY || result == Number.NEGATIVE_INFINITY)

{

    // ...

}

You could possibly use the isFinite function instead, depending on how you want to treat NaN. isFinite returns false if your number is POSITIVE_INFINITY, NEGATIVE_INFINITY or NaN.

if (isFinite(result))

{

    // ...

}