FlatMap
Generated from the engine's own definition: compute-engine's symbol, which we neither extend nor document by hand. No examples yet — the crosswalk is the reason it has a page.
Map a function over a collection and concatenate the results into a single list, splicing collection-valued results and keeping scalar results as single elements.
FlatMap(collection<T>, mapping: (T) any -> U) -> list where T, Uas compute-engine declares it