{%= name %} {%= badge(“fury”) %}

{%= description %}

Install

{%= include(“install”) %}

Run tests

npm test

Usage

var isNumber = require('{%= name %}');

true

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'));

isNumber(Infinity);
isNumber('Infinity');

If you want Infinity to be false, just do:

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

function isNum(val) {
  return isNumber(val) && isFinite(val);
}

false

isNumber('3abc');
isNumber('abc');
isNumber('abc3');
isNumber('null');
isNumber('undefined');
isNumber([1, 2, 3]);
isNumber(function () {});
isNumber(new Buffer('abc'));
isNumber(null);
isNumber(undefined);
isNumber({abc: 'abc'});
isNumber({});
isNumber([]);

Notes

Instead of using isFinite(), you can also achieve similar results by using something like ((+n+1) / (+n+1) === 1)), but this alone allows values like null to pass as numbers (in JavaScript, the leading + coerces the value to a number, see this gist for some oddities).

Author

{%= include(“author”) %}

License

{%= copyright() %} {%= license() %}

---

{%= include(“footer”) %}