refactor: leverage intersect_with

content/en/docs/languages/erlang/sampling.md

@@ -159,16 +159,12 @@ description(_) ->
     <<"AttributeSampler">>.
 
 should_sample(_Ctx, _TraceId, _Links, _SpanName, _SpanKind, Attributes, ConfigAttributes) ->
-  case maps:intersect(Attributes, ConfigAttributes) of
-    Intersection when map_size(Intersection) > 0 ->
-      Keys = maps:keys(Intersection),
-      ConfAttrPairs = [{maps:get(Key, Attr), maps:get(Key, Conf)} || Key <- Keys],
-      case lists:any(fun({A, B}) -> A == B end, ConfAttrPairs) of
-        true -> {?DROP, [], []};
-        _ -> {?RECORD_AND_SAMPLE, [], []}
-      end;
-    _ -> {?RECORD_AND_SAMPLE, [], []}
+  ConfAttrPairs = maps:intersect_with(fun (_key, Attr, Conf) -> {Attr, Conf} end, Attributes, ConfigAttributes),
+  case lists:any(fun({_, {A, B}}) -> A == B end, maps:to_list(ConfAttrPairs)) of
+    true -> {drop, [], []};
+    _ -> {record_and_sample, [], []}
   end
+end.
 ```
 
 {{% /tab %}} {{% tab Elixir %}}
@@ -189,12 +185,12 @@ defmodule AttributesSampler do
 
   def should_sample(_ctx, _trace_id, _links, _span_name, _span_kind, attributes, config_attributes) do
     attr_match =
-      Map.intersect(attributes, config_attributes)
-      |> Map.keys()
-      |> Enum.map(fn key -> {Map.get(attributes, key), Map.get(config_attributes, key)} end)
-      |> Enum.any?(fn {attr, conf} -> attr == conf end)
+      Map.intersect(attributes, config_attributes, fn _key, attr, conf -> {attr, conf} end)
+      |> Map.to_list()
+      |> Enum.any?(fn {_, {attr, conf}} -> attr == conf end)
 
     if attr_match, do: {:drop, [], []}, else: {:record_and_sample, [], []}
+  end
 end
 ```