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    is-number
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/is-number package

    2.1.0 • Public • Published

    is-number NPM version Build Status

    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)      //=> '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'

    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.

    Install

    npm i [email protected]

    Version

    2.1.0

    License

    MIT

    Last publish

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