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Add hope_option:return/2, which accepts a condition
[hope.git]
/
src
/
hope_option.erl
diff --git
a/src/hope_option.erl
b/src/hope_option.erl
index
5721628
..
7a87438
100644
(file)
--- a/
src/hope_option.erl
+++ b/
src/hope_option.erl
@@
-10,6
+10,7
@@
[ put/2
, get/2
, return/1
[ put/2
, get/2
, return/1
+ , return/2
, map/2
, iter/2
, pipe/2
, map/2
, iter/2
, pipe/2
@@
-27,10
+28,7
@@
-spec put(A, fun((A) -> boolean())) ->
t(A).
put(X, F) ->
-spec put(A, fun((A) -> boolean())) ->
t(A).
put(X, F) ->
- case F(X)
- of true -> {some, X}
- ; false -> none
- end.
+ return(X, F).
-spec get(t(A), Default :: A) ->
A.
-spec get(t(A), Default :: A) ->
A.
@@
-42,6
+40,14
@@
get(none , Y) -> Y.
return(X) ->
{some, X}.
return(X) ->
{some, X}.
+-spec return(A, fun((A) -> boolean())) ->
+ t(A).
+return(X, Condition) ->
+ case Condition(X)
+ of true -> {some, X}
+ ; false -> none
+ end.
+
-spec map(t(A), fun((A) -> (B))) ->
t(B).
map({some, X}, F) -> {some, F(X)};
-spec map(t(A), fun((A) -> (B))) ->
t(B).
map({some, X}, F) -> {some, F(X)};
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