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How can I load field values into an array using arcade expression?

Question asked by epena6 on Nov 10, 2017
Latest reply on Jul 7, 2020 by orrgvili

I am exploring Add Attribute Rule in ArcGIS Pro 2.1-beta.1.  I want to look at all values in an ID field, take the max value, and add 1. This way I can set up a rule that will always add the sequential number on INSERT.  How can I create an array of all existing values in an ID field? Is this possible with an arcade expression?