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ABL Reference
Class Properties and Methods Reference : AddNull( ) method (JsonObject)
 

AddNull( ) method (JsonObject)

Creates a property with a given name and sets its value to null.
This method is useful for those situations where you know at compile time that you will be adding a JSON null value. To use one of the Add( ) overloadings, you must set a variable to the Unknown value (?) first, then call Add( ) with the variable. Using the Unknown value (?) value as a constant in one of the Add( ) overloadings causes a compilation error, because the compiler is unable to resolve the overloading to use.
On successful execution, this method returns TRUE.
Return type: LOGICAL
Access: PUBLIC
Applies to: Progress.Json.ObjectModel.JsonObject class

Syntax

AddNull( INPUT property-name AS CHARACTER )
property-name
A CHARACTER expression naming the new property to be created. This name may be any string that can be represented as a valid Unicode string.
If property-name is the empty string (""), is the Unknown value (?), or does not exist, a JsonError is raised.