1 # is-number [![NPM version](https://img.shields.io/npm/v/is-number.svg?style=flat)](https://www.npmjs.com/package/is-number) [![NPM downloads](https://img.shields.io/npm/dm/is-number.svg?style=flat)](https://npmjs.org/package/is-number) [![Build Status](https://img.shields.io/travis/jonschlinkert/is-number.svg?style=flat)](https://travis-ci.org/jonschlinkert/is-number)
3 > Returns true if the value is a number. comprehensive tests.
7 Install with [npm](https://www.npmjs.com/):
10 $ npm install --save is-number
15 To understand some of the rationale behind the decisions made in this library (and to learn about some oddities of number evaluation in JavaScript), [see this gist](https://gist.github.com/jonschlinkert/e30c70c713da325d0e81).
18 var isNumber = require('is-number');
23 See the [tests](./test.js) for more examples.
26 isNumber(5e3) //=> 'true'
27 isNumber(0xff) //=> 'true'
28 isNumber(-1.1) //=> 'true'
29 isNumber(0) //=> 'true'
30 isNumber(1) //=> 'true'
31 isNumber(1.1) //=> 'true'
32 isNumber(10) //=> 'true'
33 isNumber(10.10) //=> 'true'
34 isNumber(100) //=> 'true'
35 isNumber('-1.1') //=> 'true'
36 isNumber('0') //=> 'true'
37 isNumber('012') //=> 'true'
38 isNumber('0xff') //=> 'true'
39 isNumber('1') //=> 'true'
40 isNumber('1.1') //=> 'true'
41 isNumber('10') //=> 'true'
42 isNumber('10.10') //=> 'true'
43 isNumber('100') //=> 'true'
44 isNumber('5e3') //=> 'true'
45 isNumber(parseInt('012')) //=> 'true'
46 isNumber(parseFloat('012')) //=> 'true'
51 See the [tests](./test.js) for more examples.
54 isNumber('foo') //=> 'false'
55 isNumber([1]) //=> 'false'
56 isNumber([]) //=> 'false'
57 isNumber(function () {}) //=> 'false'
58 isNumber(Infinity) //=> 'false'
59 isNumber(NaN) //=> 'false'
60 isNumber(new Array('abc')) //=> 'false'
61 isNumber(new Array(2)) //=> 'false'
62 isNumber(new Buffer('abc')) //=> 'false'
63 isNumber(null) //=> 'false'
64 isNumber(undefined) //=> 'false'
65 isNumber({abc: 'abc'}) //=> 'false'
72 * [even](https://www.npmjs.com/package/even): Get the even numbered items from an array. | [homepage](https://github.com/jonschlinkert/even "Get the even numbered items from an array.")
73 * [is-even](https://www.npmjs.com/package/is-even): Return true if the given number is even. | [homepage](https://github.com/jonschlinkert/is-even "Return true if the given number is even.")
74 * [is-odd](https://www.npmjs.com/package/is-odd): Returns true if the given number is odd. | [homepage](https://github.com/jonschlinkert/is-odd "Returns true if the given number is odd.")
75 * [is-primitive](https://www.npmjs.com/package/is-primitive): Returns `true` if the value is a primitive. | [homepage](https://github.com/jonschlinkert/is-primitive "Returns `true` if the value is a primitive. ")
76 * [kind-of](https://www.npmjs.com/package/kind-of): Get the native type of a value. | [homepage](https://github.com/jonschlinkert/kind-of "Get the native type of a value.")
77 * [odd](https://www.npmjs.com/package/odd): Get the odd numbered items from an array. | [homepage](https://github.com/jonschlinkert/odd "Get the odd numbered items from an array.")
81 Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
85 _(This document was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme) (a [verb](https://github.com/verbose/verb) generator), please don't edit the readme directly. Any changes to the readme must be made in [.verb.md](.verb.md).)_
87 To generate the readme and API documentation with [verb](https://github.com/verbose/verb):
90 $ npm install -g verb verb-generate-readme && verb
95 Install dev dependencies:
98 $ npm install -d && npm test
105 * [github/jonschlinkert](https://github.com/jonschlinkert)
106 * [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
110 Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
111 Released under the [MIT license](https://github.com/jonschlinkert/is-number/blob/master/LICENSE).
115 _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.1.30, on September 10, 2016._