OB Is empty
OB Is empty ( object ) : Boolean
| Parameter | Type | Description | |
|---|---|---|---|
| object | Object, Object | → | Structured object |
| Function result | Boolean | ← | True if object is empty or undefined, otherwise False |
Description
The OB Is empty command returns True if object is undefined or empty, and False if object is defined (initialized) and contains at least one property.
object can be an object varialble or a 4D object field.
Example
Here are the different results of this command as well as the OB Is defined command, depending on the context:
var $ref : Object
$empty:=OB Is empty($ref) // True
$def:=OB Is defined($ref) // False
OB SET($ref;"name";"Susie";"age";4)
// $ref="{"name":"Susie","age":4}"
$empty:=OB Is empty($ref) // False
$def:=OB Is defined($ref) // True
OB REMOVE($ref;"name")
OB REMOVE($ref;"age")
$empty:=OB Is empty($ref) // True
$def:=OB Is defined($ref) // True