How to loop through items in data types?

A quick re-introduction to how to loop over workflows with List Shifter here: Live Bubbling with @keith: Let's Iterate Over Some Shtuff

Video that (eventually) explains how List Popper can help you build iterative workflows in your/the backend (see whut I did there?) here: List Popper and Friends: New SSA Plugin for Your Backend Workflow (API Workflow) Needs