diff options
Diffstat (limited to 'lib/stdlib/src/maps.erl')
| -rw-r--r-- | lib/stdlib/src/maps.erl | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl index 4ef1638e6d..ba4d6a5c87 100644 --- a/lib/stdlib/src/maps.erl +++ b/lib/stdlib/src/maps.erl @@ -24,6 +24,7 @@ map/2, size/1, without/2, + with/2, get/3 ]). @@ -133,10 +134,10 @@ to_list(_) -> erlang:nif_error(undef). update(_,_,_) -> erlang:nif_error(undef). --spec values(Map) -> Keys when +-spec values(Map) -> Values when Map :: map(), - Keys :: [Key], - Key :: term(). + Values :: [Value], + Value :: term(). values(_) -> erlang:nif_error(undef). @@ -201,3 +202,13 @@ size(Map) when is_map(Map) -> 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)]). + + +-spec with(Ks, Map1) -> Map2 when + Ks :: [K], + Map1 :: map(), + 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)]). |