Package Exports

is-number

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (is-number) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

is-number

Is the value a number? Has extensive tests.

Install

Install with npm:

npm i is-number --save-dev

Run tests

npm test

Usage

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

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

Jon Schlinkert

License

This file was generated by verb-cli on September 21, 2014.