JavaScript Number isFinite()
Examples
Is 123 finite?
Number.isFinite(123)
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Number.isFinite("123")
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Description
The Number.isFinite() method returns
true if a number is a finite number.
Infinite (not finite) numbers are Infinity,
-Infinity, or NaN
Otherwise it returns false.
See Also:
Difference Between isFinite() and Number.isFinite()
isFinite() returns true if a value is a finite number.
Number.isFinite() returns true if a number is a finite number.
In other words:
isFinite() converts the value to a number before testing it.
Examples
// This returns true
isFinite(123)
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// This returns false
Number.isFinite("123")
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Syntax
Number.isFinite(value)
Parameters
| Parameter | Description |
| value | Required. The value to be tested. |
Return Value
| Type | Description |
| A boolean | true if the value is a finite Number, otherwise false. |
More Examples
Number.isFinite(+1.23)
Number.isFinite(-1.23)
Number.isFinite('2005/12/12')
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Number.isFinite(5-2)
Number.isFinite(5/2)
Number.isFinite(0)
Number.isFinite(0/0)
Number.isFinite(Infinity)
Number.isFinite(-Infinity)
Number.isFinite(NaN)
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Browser Support
Number.isFinite() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
Number.isFinite() is not supported in Internet Explorer.
