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- # is-number [](https://www.npmjs.com/package/is-number) [](https://npmjs.org/package/is-number) [](https://npmjs.org/package/is-number) [](https://travis-ci.org/jonschlinkert/is-number)
- > Returns true if the value is a number. comprehensive tests.
- Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
- ## Install
- Install with [npm](https://www.npmjs.com/):
- ```sh
- $ npm install --save is-number
- ```
- ## Usage
- 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).
- ```js
- var isNumber = require('is-number');
- ```
- ### true
- See the [tests](./test.js) for more examples.
- ```js
- isNumber(5e3) //=> 'true'
- isNumber(0xff) //=> 'true'
- isNumber(-1.1) //=> 'true'
- isNumber(0) //=> 'true'
- isNumber(1) //=> 'true'
- isNumber(1.1) //=> 'true'
- isNumber(10) //=> 'true'
- isNumber(10.10) //=> 'true'
- isNumber(100) //=> 'true'
- isNumber('-1.1') //=> 'true'
- isNumber('0') //=> 'true'
- isNumber('012') //=> 'true'
- isNumber('0xff') //=> 'true'
- isNumber('1') //=> 'true'
- isNumber('1.1') //=> 'true'
- isNumber('10') //=> 'true'
- isNumber('10.10') //=> 'true'
- isNumber('100') //=> 'true'
- isNumber('5e3') //=> 'true'
- isNumber(parseInt('012')) //=> 'true'
- isNumber(parseFloat('012')) //=> 'true'
- ```
- ### False
- See the [tests](./test.js) for more examples.
- ```js
- isNumber('foo') //=> 'false'
- isNumber([1]) //=> 'false'
- isNumber([]) //=> 'false'
- isNumber(function () {}) //=> 'false'
- isNumber(Infinity) //=> 'false'
- isNumber(NaN) //=> 'false'
- isNumber(new Array('abc')) //=> 'false'
- isNumber(new Array(2)) //=> 'false'
- isNumber(new Buffer('abc')) //=> 'false'
- isNumber(null) //=> 'false'
- isNumber(undefined) //=> 'false'
- isNumber({abc: 'abc'}) //=> 'false'
- ```
- ## About
- <details>
- <summary><strong>Contributing</strong></summary>
- Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
- </details>
- <details>
- <summary><strong>Running Tests</strong></summary>
- Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
- ```sh
- $ npm install && npm test
- ```
- </details>
- <details>
- <summary><strong>Building docs</strong></summary>
- _(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
- To generate the readme, run the following command:
- ```sh
- $ npm install -g verbose/verb#dev verb-generate-readme && verb
- ```
- </details>
- ### Related projects
- You might also be interested in these projects:
- * [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.")
- * [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.")
- * [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.")
- * [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. ")
- * [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.")
- * [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.")
- ### Contributors
- | **Commits** | **Contributor** |
- | --- | --- |
- | 38 | [jonschlinkert](https://github.com/jonschlinkert) |
- | 5 | [charlike](https://github.com/charlike) |
- ### Author
- **Jon Schlinkert**
- * [github/jonschlinkert](https://github.com/jonschlinkert)
- * [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
- ### License
- Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
- Released under the [MIT License](LICENSE).
- ***
- _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on October 17, 2017._
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