EDIT: My question was originally “Is there a standard name for a function that flattens a list of lists, but only one level deep?”, but Chuck’s answer is phrased much closer to what I actually wanted to ask, so I renamed it. All three answers were useful to me, though. Thanks.
‘flatten’ seems to be a well-accepted name for a function that takes a tree and builds a list of atoms however deep they are nested, but what about a function that stops after just one level? So ((1 2) ((3 4) (5 6)) (7 8)) “somethings” to (1 2 (3 4) (5 6) 7 8). Does “something” have a common name across multiple languages/libraries?
The answers to this question:
Flattening a shallow list in Python
suggest that ‘chain’ might be a good guess, but is it common enough to be “standard”?
The function that takes a list of lists and returns a single list containing the contents of those lists is called “concat” in many functional languages (e.g. OCaml, F#, Haskell, Clojure).