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Add result type module and define pipe.
[hope.git]
/
src
/
hope_result.erl
diff --git a/src/hope_result.erl
b/src/hope_result.erl
new file mode 100644
(file)
index 0000000..
405f2e0
--- /dev/null
+++ b/
src/hope_result.erl
@@ -0,0
+1,18
@@
+-module(hope_result).
+
+-export_type([ t/2
+ ]).
+
+-export([ pipe/2
+ ]).
+
+
+-type t(A, B) :: {ok, A} | {error, B}.
+
+
+pipe([] , X) -> X;
+pipe([F|Fs], X) ->
+ case F(X)
+ of {error, _}=E -> E
+ ; {ok, Y} -> pipe(Fs, Y)
+ end.
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