PHP style empty function for JavaScript
I often find myself wanting the empty() function of PHP in JavaScript, here it is:
function empty(val){
if(val == null || val == undefined)
return true;
switch(typeof val){
case 'string':
if(val.length != 0)
return false;
break;
case 'number':
if(val != 0)
return false;
break;
case 'boolean':
if(val == true)
return false;
break;
case 'object':
var hasProps = false;
for(var i in val) { hasProps = true; }
if(hasProps){
if(val['length'] != 0)
return false;
}
break;
default:
return false;
break;
}
return true;
}
Note how heavily we rely on typeof to inspect the data.
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Tags: empty, Javascript