is-number
Returns true if the value is a number. comprehensive tests.
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.
Install
Install with npm
$ npm i is-number --save
Usage
var isNumber = require('is-number');
true
See the tests for more examples.
isNumber(5e3)
isNumber(0xff)
isNumber(-1.1)
isNumber(0)
isNumber(1)
isNumber(1.1)
isNumber(10)
isNumber(10.10)
isNumber(100)
isNumber('-1.1')
isNumber('0')
isNumber('012')
isNumber('0xff')
isNumber('1')
isNumber('1.1')
isNumber('10')
isNumber('10.10')
isNumber('100')
isNumber('5e3')
isNumber(parseInt('012'))
isNumber(parseFloat('012'))
False
See the tests for more examples.
isNumber('foo')
isNumber([1])
isNumber([])
isNumber(function () {})
isNumber(Infinity)
isNumber(NaN)
isNumber(new Array('abc'))
isNumber(new Array(2))
isNumber(new Buffer('abc'))
isNumber(null)
isNumber(undefined)
isNumber({abc: 'abc'})
Other projects
Contributing
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
Run tests
Install dev dependencies:
$ npm i -d && npm test
Author
Jon Schlinkert
License
Copyright © 2015 Jon Schlinkert
Released under the MIT license.
This file was generated by verb-cli on November 22, 2015.