To provide more functionality on working with lists I would like to propose a ListExpressionEvaluator transformer. This would evaluate a specific expression on every item in a list. The result can overwrite a list item or form a new attribute on the list.
In the expression you would have access to the attributes of a list item, and all the attributes of the feature itself. As an example list:
someList[0].Value1 = 15 someList[0].Value2 = 30 someList[1].Value1 = 15 someList[1].Value2 = 20
The user would pick the list: somelist. The expression could be: MaxValue = max(Value1, Value2).
Which would leave the list as:
someList[0].Value1 = 30 someList[0].Value2 = 15 someList[0].MaxValue = 30 someList[1].Value1 = 15 someList[1].Value2 = 20 someList[1].MaxValue = 20
Bonus points for providing access to previous/subsequent list items, similar to the adjacent feature access on the AttributeCreator. This can of course be accomplished with Python or a ListExploder, but preferably we won't need Python and I can keep my features intact.
