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

IsNull( ) method (JsonObject)

Returns a LOGICAL indicating if a property in a JsonObject contains the null value.
Return type: LOGICAL
Access: PUBLIC
Applies to: Progress.Json.ObjectModel.JsonObject class


IsNull(INPUT property-name AS CHARACTER )
A CHARACTER expression naming the property to be tested.
A JsonError is raised if:
*property-name is the empty string (""), or is the Unknown value (?)
*The property does not exist