diff options
| -rw-r--r-- | lib/stdlib/src/maps.erl | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl index 3c798b7a04..43d10f4800 100644 --- a/lib/stdlib/src/maps.erl +++ b/lib/stdlib/src/maps.erl @@ -205,7 +205,7 @@ size(Val) -> K :: term(). without(Ks,M) when is_list(Ks), is_map(M) -> - maps:from_list([{K,V}||{K,V} <- maps:to_list(M), not lists:member(K, Ks)]); + lists:foldl(fun(K, M1) -> ?MODULE:remove(K, M1) end, M, Ks); without(Ks,M) -> erlang:error(error_type(M),[Ks,M]). @@ -216,8 +216,16 @@ without(Ks,M) -> Map2 :: map(), K :: term(). -with(Ks,M) when is_list(Ks), is_map(M) -> - maps:from_list([{K,V}||{K,V} <- maps:to_list(M), lists:member(K, Ks)]); +with(Ks,Map1) when is_list(Ks), is_map(Map1) -> + Fun = fun(K, List) -> + case ?MODULE:find(K, Map1) of + {ok, V} -> + [{K, V} | List]; + error -> + List + end + end, + ?MODULE:from_list(lists:foldl(Fun, [], Ks)); with(Ks,M) -> erlang:error(error_type(M),[Ks,M]). |