.config/coc/extensions/node_modules/coc-prettier/node_modules/has-values/node_modules/is-number/README.md

   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)
   2
   3 > Returns true if the value is a number. comprehensive tests.
   4
   5 ## Install
   6
   7 Install with [npm](https://www.npmjs.com/):
   8
   9 ```sh
  10 $ npm install --save is-number
  11 ```
  12
  13 ## Usage
  14
  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).
  16
  17 ```js
  18 var isNumber = require('is-number');
  19 ```
  20
  21 ### true
  22
  23 See the [tests](./test.js) for more examples.
  24
  25 ```js
  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'
  47 ```
  48
  49 ### False
  50
  51 See the [tests](./test.js) for more examples.
  52
  53 ```js
  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'
  66 ```
  67
  68 ## About
  69
  70 ### Related projects
  71
  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.")
  78
  79 ### Contributing
  80
  81 Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
  82
  83 ### Building docs
  84
  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).)_
  86
  87 To generate the readme and API documentation with [verb](https://github.com/verbose/verb):
  88
  89 ```sh
  90 $ npm install -g verb verb-generate-readme && verb
  91 ```
  92
  93 ### Running tests
  94
  95 Install dev dependencies:
  96
  97 ```sh
  98 $ npm install -d && npm test
  99 ```
 100
 101 ### Author
 102
 103 **Jon Schlinkert**
 104
 105 * [github/jonschlinkert](https://github.com/jonschlinkert)
 106 * [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
 107
 108 ### License
 109
 110 Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
 111 Released under the [MIT license](https://github.com/jonschlinkert/is-number/blob/master/LICENSE).
 112
 113 ***
 114
 115 _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.1.30, on September 10, 2016._