53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
---
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title: Number isInteger
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---
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# Number isInteger
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## Description
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The ```Number.isInteger()``` method determines whether the passed value is an integer. This method was introduced in ES6
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## Syntax
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```Number.isInteger(val)```
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### Parameters
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**val** - value to check for being an integer
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## Return value
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A [Boolean](https://guide.freecodecamp.org/javascript/booleans) indicating whether the value is an integer or not.
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## Description
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The method returns ```true``` if passed value is an integer, otherwise it returns ```false```. Infinite and ```NaN``` values return ```false```.
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## Examples
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```
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Number.isInteger(0); // true
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Number.isInteger(-0); // true
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Number.isInteger(1); // true
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Number.isInteger(2); // true
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Number.isInteger(-100001); // true
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Number.isInteger(999999999999999999999999); // true
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Number.isInteger(0.1); // false
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Number.isInteger(0.3); // false
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Number.isInteger(Math.PI); // false
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Number.isInteger(NaN); // false
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Number.isInteger(Infinity); // false
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Number.isInteger(-Infinity); // false
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Number.isInteger('10'); // false
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Number.isInteger(true); // false
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Number.isInteger(false); // false
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Number.isInteger([1]); // false
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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.isinteger)
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<br>
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[Number.isInteger() MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger)
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