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authorBjörn-Egil Dahlberg <[email protected]>2016-04-13 19:06:05 +0200
committerBjörn-Egil Dahlberg <[email protected]>2016-04-27 15:26:54 +0200
commit8d5bc31684f8b6969b5bfde70e25b153d4018f61 (patch)
tree89e0c0987af5ba4e616fe958f3183165492dea83 /lib/stdlib
parent4c8d8550c4bb2e031440f9a0fdbe0e022247e695 (diff)
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stdlib: Add maps:update_with/3,4
Maps equivalent to dict:update/3,4
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/maps.erl42
1 files changed, 37 insertions, 5 deletions
diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl
index a8c2740617..ba9ad4f549 100644
--- a/lib/stdlib/src/maps.erl
+++ b/lib/stdlib/src/maps.erl
@@ -20,12 +20,12 @@
-module(maps).
--export([get/3,filter/2,fold/3, map/2,
- size/1,
+-export([get/3, filter/2,fold/3,
+ map/2, size/1,
+ update_with/3, update_with/4,
without/2, with/2]).
-
-%%% BIFs
+%% BIFs
-export([get/2, find/2, from_list/1,
is_key/2, keys/1, merge/2,
new/0, put/3, remove/2, take/2,
@@ -134,8 +134,40 @@ update(_,_,_) -> erlang:nif_error(undef).
values(_) -> erlang:nif_error(undef).
+%% End of BIFs
+
+-spec update_with(Key,Fun,Map1) -> Map2 when
+ Key :: term(),
+ Map1 :: map(),
+ Map2 :: map(),
+ Fun :: fun((Value1 :: term()) -> Value2 :: term()).
+
+update_with(Key,Fun,Map) when is_function(Fun,1), is_map(Map) ->
+ try maps:get(Key,Map) of
+ Val -> maps:update(Key,Fun(Val),Map)
+ catch
+ error:{badkey,_} ->
+ erlang:error({badkey,Key},[Key,Fun,Map])
+ end;
+update_with(Key,Fun,Map) ->
+ erlang:error(error_type(Map),[Key,Fun,Map]).
+
+
+-spec update_with(Key,Fun,Init,Map1) -> Map2 when
+ Key :: term(),
+ Map1 :: Map1,
+ Map2 :: Map2,
+ Fun :: fun((Value1 :: term()) -> Value2 :: term()),
+ Init :: term().
+
+update_with(Key,Fun,Init,Map) when is_function(Fun,1), is_map(Map) ->
+ case maps:find(Key,Map) of
+ {ok,Val} -> maps:update(Key,Fun(Val),Map);
+ error -> maps:put(Key,Init,Map)
+ end;
+update_with(Key,Fun,Init,Map) ->
+ erlang:error(error_type(Map),[Key,Fun,Init,Map]).
-%%% End of BIFs
-spec get(Key, Map, Default) -> Value | Default when
Key :: term(),