common-npm-package v1.0.0

is-null

Returns true if the value is null.

Install

Install with npm:

$ npm install --save is-null

Usage

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.

var isNull = require('is-null');

true

See the tests for more examples.

isNumber('')           //=> 'true'
isNumber('      ')     //=> 'true'
isNumber(null)         //=> 'true'
isNumber(undefined)    //=> 'true'
isNumber(NaN)          //=> 'true'
isNumber({})           //=> 'true'
isNumber([])           //=> 'true'
isNumber(-1)           //=> 'true'

False

See the tests for more examples.

isNumber('1')             //=> 'false'
isNumber(0)               //=> 'false'
isNumber([1, 2])          //=> 'false'
isNumber({a: 1})          //=> 'false'