Version 3.3.1 of package Map has just been released in GNU ELPA. You can now find it in M-x list-packages RET.
Map describes itself as: ========================== Map manipulation functions ========================== More at https://elpa.gnu.org/packages/map.html ## Summary: map.el provides generic map-manipulation functions that work on alists, plists, hash-tables, and arrays. All functions are prefixed with "map-". Functions taking a predicate or iterating over a map using a function take the function as their first argument. All other functions take the map as their first argument. ## Recent NEWS: [Not provided 🙁]