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is-number

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is-number

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


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Maintainers
2
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68,422,931
decreased by-8.35%

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Package description

What is is-number?

The is-number npm package is a simple utility for checking if a value is a number. It works with various types of numeric representations, including strings that can be coerced to numbers, and provides a straightforward API for determining if a value can be considered a number in JavaScript.

What are is-number's main functionalities?

Check if a value is a number

This feature allows you to check if a value is a number, including numeric strings.

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

console.log(isNumber(5)); // true
console.log(isNumber('5')); // true
console.log(isNumber('five')); // false

Check if a value is not a number

This feature allows you to check if a value is not a number, including strings that cannot be coerced to numbers and other non-numeric types.

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

console.log(isNumber('foo')); // false
console.log(isNumber([1, 2, 3])); // false

Check if a value is a finite number

This feature allows you to check if a value is a finite number, excluding Infinity, -Infinity, and NaN.

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

console.log(isNumber(Infinity)); // false
console.log(isNumber(-Infinity)); // false
console.log(isNumber(NaN)); // false

Other packages similar to is-number

Readme

Source

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.

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Last updated on 22 Nov 2015

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