lix-website/themes/lix/assets/bootstrap/node_modules/is-natural-number/README.md

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2024-04-27 03:39:10 +00:00
# is-natural-number.js
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Check if a value is a [natural number](https://wikipedia.org/wiki/Natural_number)
## Installation
### Package managers
#### [npm](https://www.npmjs.com/)
```
npm install is-natural-number
```
#### [Bower](http://bower.io/)
```
bower install is-natural-number
```
#### [Duo](http://duojs.org/)
```javascript
var isNaturalNumber = require('shinnn/is-natural-number.js');
```
### Standalone
[Download the script file directly.](https://raw.githubusercontent.com/shinnn/is-natural-number.js/master/is-natural-number.js)
## API
### isNaturalNumber(*number*, *option*)
*number*: `Number`
*option*: `Object`
Return: `Boolean`
It returns `true` if the first argument is one of the natural numbers. If not, or the argument is not a number, it returns `false`.
```javascript
isNaturalNumber(10); //=> true
isNaturalNumber(-10); //=> false
isNaturalNumber(10.5); //=> false
isNaturalNumber(Infinity); //=> false
isNaturalNumber('10'); //=> false
```
*Check [the test](./test.js) for more detailed specifications.*
#### option.includeZero
Type: `Boolean`
Default: `false`
By default the number `0` is not regarded as a natural number.
Setting this option `true` makes `0` regarded as a natural number.
```javascript
isNaturalNumber(0); //=> false
isNaturalNumber(0, {includeZero: true}); //=> true
```
## License
Copyright (c) 2014 - 2016 [Shinnosuke Watanabe](https://github.com/shinnn)
Licensed under [the MIT License](./LICENSE).