is-natural-number.js

Check if a number is a natural number

Installation

Package managers

npm

npm install is-natural-number

Bower

bower install is-natural-number

Duo

var isNaturalNumber = require('shinnn/is-natural-number.js');

Standalone

Download the script file directly.

API

isNaturalNumber(number, includeZero)

number: Number
includeZero: Boolean
Return: String

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.

isNaturalNumber(10); //=> true

isNaturalNumber(-10); //=> false
isNaturalNumber(10.5); //=> false
isNaturalNumber(Infinity); //=> false
isNaturalNumber('10'); //=> false

Check the test for more detailed specifications.

includeZero

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.

isNaturalNumber(0); //=> false
isNaturalNumber(0, true); //=> true

License

Copyright (c) 2014 - 2015 Shinnosuke Watanabe

Licensed under the MIT License.