Thanks, <@U4UGS5FC7> that’s definitely interesting...

# codereview

[arekolek]

Thanks, @raulraja that’s definitely interesting and useful information. In my example I actually have a list of `Node`s at top level (so a forest), not just one node (as in root node). But if I wanted to define flatMap for Node, that would probably be best as an extension function? I’m not sure how I could get rid of the intermediate collections, but I’ll look into the links you posted later.