Since August 31 it is possible to compose string variables, which is great. However, I miss more options:
1) Compose other variable types, mainly
integer
float
boolean
arrays
2) manipulate them with WDL (https://msdn.microsoft.com/en-us/library/azure/mt643789.aspx), as it is currently supported when editing Conditions in advanced mode
This way lots of use cases that require counters, string manipulation etc could be implemented directly with Microsoft Flow
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You can use any of the 70+ expressions from the Workflow Definition Language in Flow: https://flow.microsoft.com/blog/use-expressions-in-actions/