Returns a LOGICAL indicating if an element in a JsonArray contains the null value.

Return type: LOGICAL

Access: PUBLIC

Applies to: Progress.Json.ObjectModel.JsonArray class

Syntax

IsNull( INPUT index AS INTEGER )
index
An INTEGER identifying the element to be tested. Indexing into JsonArrays is 1-based.

A JsonError is raised if index is less than 1, is greater than the length of the JsonArray, or is the Unknown value (?).