"A function that returns the result of applying the given [[function|resulting]] function to the [[item|Entry.item]] of a given [[Entry]], discarding its `key`. Map<String,List<Item>> map = ... ; {Item?*} topItems = map.map(forItem(List<Item>.first));" see (`function forKey`) shared Result forItem<Item,Result>(Result resulting(Item item)) (Object->Item entry) given Item satisfies Object => resulting(entry.item);