I would like to write an Arcade expression to generate a unique next sequence number in a feature class. which needs to compare two feature classes and generate unique number which is not included in either of feature classes.
Is there way to list all field values, display in console and pass them to array ?
You can use Max on a featureset, this would get you the highest number in each class, and then increment by one
https://developers.arcgis.com/arcade/function-reference/featureset_functions/#max
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