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is-number

> Returns true if the value is a number. comprehensive tests.

# Install

Install with npm:

$ 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.

var isNumber = require('is-number');

## true

See the tests for more examples.

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 for more examples.

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

## Related projects

- even: Get the even numbered items from an array. | homepage
- is-even: Return true if the given number is even. | homepage
- is-odd: Returns true if the given number is odd. | homepage
- is-primitive: Returns `true` if the value is a primitive. | homepage
- kind-of: Get the native type of a value. | homepage
- odd: Get the odd numbered items from an array. | homepage

## Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

## Building docs

_(This document was generated by verb-generate-readme (a verb generator), please don't edit the readme directly. Any changes to the readme must be made in .verb.md.)_

To generate the readme and API documentation with verb:

$ npm install -g verb verb-generate-readme && verb

## Running tests

Install dev dependencies:

$ npm install -d && npm test

## Author

Jon Schlinkert

- github/jonschlinkert
- twitter/jonschlinkert

## License

Copyright © 2016, Jon Schlinkert. Released under the MIT license.

This file was generated by verb-generate-readme, v0.1.30, on September 10, 2016.