OB Is empty
OB Is empty ( object ) -> Function result
| Parameter | Type | Description | |
|---|---|---|---|
| object | Object, Object Field | 🡒 | 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 must have been created using the C_OBJECT command or designate 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