54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
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---
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title: Number isFinite
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---
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# Number isFinite
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## Description
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The ```Number.isFinite()``` method checks if the value passed into it is a finite number. This method was introduced in ES6
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## Syntax
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```Number.isFinite(val)```
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### Parameters
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**val** - value to check for finiteness
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## Return value
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A [Boolean](https://guide.freecodecamp.org/javascript/booleans) indicating whether the value is a finite number or not.
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## Description
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```Number.isFinite``` is different from the global [isFinite()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isFinite) method, it doesn’t convert the tested value into a number. This means the value needs to be a number and finite to return true.
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## Examples
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```
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Number.isFinite(Infinity) // false
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Number.isFinite(-Infinity) // false
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Number.isFinite(1234) // true
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Number.isFinite(-1.11) // true
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Number.isFinite(0) // true
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Number.isFinite(3g55) // true
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Number.isFinite('1234') // false
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Number.isFinite('Hi') // false
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Number.isFinite('2005/12/12') // false
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Number.isFinite('0'); // false, would've been true with
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// global isFinite('0')
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Number.isFinite(null); // false, would've been true with
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// global isFinite(null)
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```
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<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
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#### More Information:
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<!-- Please add any articles you think might be helpful to read before writing the article -->
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[ECMA 2015 Docs](https://www.ecma-international.org/ecma-262/6.0/#sec-number.isfinite)
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<br>
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[Number.isFinite() MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite)
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