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Faster filter #31

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11 changes: 6 additions & 5 deletions src/Result/Extra.elm
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Original file line number Diff line number Diff line change
Expand Up @@ -434,12 +434,13 @@ original value when a predicate matches.
-}
filter : e -> (a -> Bool) -> Result e a -> Result e a
filter err predicate result =
case Result.map predicate result of
Ok True ->
result
case result of
Ok a ->
if predicate a then
result

Ok False ->
Err err
else
Err err

Err _ ->
result
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