Empty function script

[Darkranger85]

(I did indeed read the rules of this forum and while I'm not a "seasoned" javascript coder I thought that this script was simple enough to not matter. If that is unacceptable I apologize and you can feel free to delete this post)

Here is a function that allows you to use a PHP like 'empty()' function. It helped me a lot because it combines several other JS functions into one neat package.

function empty(obj) {
    if (typeof obj == 'undefined' || obj === null || obj === '') return true;
    if (typeof obj == 'number' && isNaN(obj)) return true;
    if (obj instanceof Date && isNaN(Number(obj))) return true;
    return false;
}

Hope this helps people as much as it helps me!

[Nile]

You can be less repetitive like this:

function empty(obj){
   return (typeof obj == 'undefined' || obj === null || obj === '') || (typeof obj == 'number' && isNaN(obj)) || (obj instanceof Date && isNaN(Number(obj)));
}

[rnd me]

Originally Posted by Nile

You can be less repetitive like this:

function empty(obj){
   return (typeof obj == 'undefined' || obj === null || obj === '') || (typeof obj == 'number' && isNaN(obj)) || (obj instanceof Date && isNaN(Number(obj)));
}

you can be less repetitive and properly handle arrays and objects like this :

function empty(obj){
   var u;
   if((''+obj)==="[object Object]"){for(var i in obj);return !i;}
   return  !+obj && (!{'0':1,false:1}[obj] );
}

[Alex Vincent]

I actually prefer Nile's version here, because it's more readable.