Animation nodes, join a list / group of objects into a single mesh just struggling with this one, the solution in the picture does what I need but builds up rather than refreshing each frame. This problem stems from my general lack of programming nous.

I essentially want a set of instances that I'm generating elsewhere to be one mesh so that I can easily perform other operations / modifiers on them as a whole,

cheers

Chris
When you use a loop, you need to know, that loop inputs list of something, and break apart this list into elements inside loop. Output makes reverse things - all elements join into one list, so you don't need to do this dirty joining work.