ft: 优化

src/template/utMapsFold.erl

@@ -1,6 +1,6 @@
 -module(utMapsFold).
 
--export([fold/1]).
+-export([fold/1, diff/2, diffKeys/2]).
 
 fold(Map) ->
    fold(maps:iterator(Map), []).
@@ -12,3 +12,50 @@ fold(Iterator, AccList) ->
       none ->
          AccList
    end.
+
+
+diff(Map1, Map2) ->
+   case map_size(Map1) =< map_size(Map2) of
+      true ->
+         diff_1(maps:next(maps:iterator(Map1)), Map1, Map2);
+      _ ->
+         diff_2(maps:next(maps:iterator(Map2)), Map1)
+   end.
+
+diff_1(none, Map1, _Map2) ->
+   Map1;
+diff_1({Key, _Value, NextIter}, Map1, Map2) ->
+   case maps:is_key(Key, Map2) of
+      true ->
+         diff_1(maps:next(NextIter), maps:remove(Key, Map1), Map2);
+      _ ->
+         diff_1(maps:next(NextIter), Map1, Map2)
+   end.
+
+diff_2(none, Map1) ->
+   Map1;
+diff_2({Key, _Value, NextIter}, Map1) ->
+   diff_2(maps:next(NextIter), maps:remove(Key, Map1)).
+
+diffKeys(Map1, Map2) ->
+   case map_size(Map1) =< map_size(Map2) of
+      true ->
+         diffKeys_1(maps:next(maps:iterator(Map1)), Map2, []);
+      _ ->
+         diffKeys_2(maps:next(maps:iterator(Map2)), Map1)
+   end.
+
+diffKeys_1(none, _Map2, Acc) ->
+   Acc;
+diffKeys_1({Key, _Value, NextIter}, Map2, Acc) ->
+   case maps:is_key(Key, Map2) of
+      true ->
+         diffKeys_1(maps:next(NextIter), Map2, Acc);
+      _ ->
+         diffKeys_1(maps:next(NextIter), Map2, [Key | Acc])
+   end.
+
+diffKeys_2(none, Map1) ->
+   maps:to_list(Map1);
+diffKeys_2({Key, _Value, NextIter}, Map1) ->
+   diffKeys_2(maps:next(NextIter), maps:remove(Key, Map1)).

src/testCase/utTestMap.erl

@@ -47,3 +47,12 @@ tt3(N, Map) ->
          not_found
    end,
    tt3(N - 1, Map).
+
+ll(A, B) ->
+   A -- B.
+
+mm(A, B) ->
+   utMapsFold:diff(A, B).
+
+
+

src/testCase/utTestTime.erl

@@ -27,7 +27,10 @@ tt2(N, Sec, Fun) ->
 %% 经过测试 ls1 和 sl1 效率最高
 %%%%%%%%%%%%%%%%% datetime 和 timestamp 互相转换 测试对比函数 start %%%%%%%%%%%%%%%%%%%
 ls1(LocalDate) ->
-   erlang:universaltime_to_posixtime(erlang:localtime_to_universaltime(LocalDate)).
+   erlang:universaltime_to_posixtime(LocalDate).
+
+ls12(LocalDate) ->
+   erlang:localtime_to_universaltime(LocalDate).
 
 
 %% 此方法很准