empty-value

empty-value

:package: Check if a given value is empty in JS extending his "truthy" and "falsy" nature

Status

Installation

Using npm

npm install --save empty-value

The following values are considered to be empty:

• NaN
• 0 (0 as an integer)
• 0.0 (0 as a float)
• "0" (0 as a string)
• null
• false
• undefined
• "" (an empty string)
• " " (an string with only spaces)
• array( ) / [ ] (an empty array)
• { } (an empty object / no direct keys)

Usage

var empty = require('empty-value');

empty(true) //false
empty(12345) //false
empty(-12345) //false
empty('Lorem Ipsum is simply dummy text') //false
empty([1, 2, 3]) //false
empty({ foo: 'bar' }) //false
empty('{ "id" : 1 }') //false
empty(function () { }) //false

empty(NaN) //true
empty(0) //true
empty(0.0) //true
empty(null) //true
empty(false) //true
empty(undefined) //true
empty('0') //true
empty(''); //true
empty(' '); //true
empty([]) //true
empty({ }) //true

var proto = { foo: 'bar' };
var obj = Object.create(proto);
empty(obj) //true  Note: foo is not a directly property of obj

Using hooks

If empty can't guess the correct answer (IE: value is a function) before return FALSE you could use your own hook. See example bellow:

var myEmptyHook = function (value) {//i don't like functions
  return typeof value === 'function' ? true : false;
}
var func = function () {
  return 'bar';
}

empty(func, myEmptyHook); //true

License

MIT