-module(maps_sum).
-export([correct1/1,
wrong1/1,
wrong2/1]).
-spec correct1(#{atom() => term()}) -> integer().
correct1(Data) ->
maps:fold(fun (_Key, Value, Acc) when is_integer(Value) ->
Acc + Value;
(_Key, _Value, Acc) ->
Acc
end, 0, Data).
-spec wrong1([{atom(),term()}]) -> integer().
wrong1(Data) ->
maps:fold(fun (_Key, Value, Acc) when is_integer(Value) ->
Acc + Value;
(_Key, _Value, Acc) ->
Acc
end, 0, Data).
-spec wrong2(#{atom() => term()}) -> integer().
wrong2(Data) ->
lists:foldl(fun (_Key, Value, Acc) when is_integer(Value) ->
Acc + Value;
(_Key, _Value, Acc) ->
Acc
end, 0, Data).
