Fixed #195 (#199)

* Remove Result.fold

This wasnt' really fold and FSharp.Core implemented it

* Fixed defaultWith to use error in error case

Author: TheAngryByrd

src/FsToolkit.ErrorHandling.JobResult/JobResult.fs

@@ -18,9 +18,6 @@ module JobResult =
                  >> Job.result))
             jr
 
-    let inline foldResult ([<InlineIfLambda>] onSuccess) ([<InlineIfLambda>] onError) jr =
-        Job.map (Result.fold onSuccess onError) jr
-
     let inline eitherMap ([<InlineIfLambda>] onSuccess) ([<InlineIfLambda>] onError) jr =
         Job.map (Result.eitherMap onSuccess onError) jr
 
@@ -186,7 +183,7 @@ module JobResult =
 
     /// Extracts the contained value of an job-wrapped result if Ok, otherwise
     /// evaluates ifErrorThunk and uses the result.
-    let inline defaultWith ifErrorThunk jobResult =
+    let inline defaultWith ([<InlineIfLambda>] ifErrorThunk: 'error -> 'ok) jobResult =
         jobResult
         |> Job.map (Result.defaultWith ifErrorThunk)
 

src/FsToolkit.ErrorHandling.TaskResult/TaskResult.fs

@@ -21,9 +21,6 @@ module TaskResult =
                  >> Task.singleton)
         )
 
-    let inline foldResult ([<InlineIfLambda>] onSuccess) ([<InlineIfLambda>] onError) tr =
-        Task.map (Result.fold onSuccess onError) tr
-
     let inline ofAsync aAsync =
         aAsync
         |> Async.Catch

src/FsToolkit.ErrorHandling/AsyncResult.fs

@@ -244,7 +244,7 @@ module AsyncResult =
     /// Extracts the contained value of an async-wrapped result if Ok, otherwise
     /// evaluates ifErrorThunk and uses the result.
     let inline defaultWith
-        ([<InlineIfLambda>] ifErrorThunk: unit -> 'ok)
+        ([<InlineIfLambda>] ifErrorThunk: 'error -> 'ok)
         (asyncResult: Async<Result<'ok, 'error>>)
         : Async<'ok> =
         asyncResult

src/FsToolkit.ErrorHandling/Result.fs

@@ -87,15 +87,6 @@ module Result =
         | _, Error e, _
         | _, _, Error e -> Error e
 
-    let inline fold
-        ([<InlineIfLambda>] onOk: 'okInput -> 'output)
-        ([<InlineIfLambda>] onError: 'errorInput -> 'output)
-        (input: Result<'okInput, 'errorInput>)
-        : 'output =
-        match input with
-        | Ok x -> onOk x
-        | Error err -> onError err
-
     let inline ofChoice (input: Choice<'ok, 'error>) : Result<'ok, 'error> =
         match input with
         | Choice1Of2 x -> Ok x
@@ -252,12 +243,12 @@ module Result =
     /// Returns the contained value if Ok, otherwise evaluates ifErrorThunk and
     /// returns the result.
     let inline defaultWith
-        ([<InlineIfLambda>] ifErrorThunk: unit -> 'ok)
+        ([<InlineIfLambda>] ifErrorThunk: 'error -> 'ok)
         (result: Result<'ok, 'error>)
         : 'ok =
         match result with
         | Ok x -> x
-        | Error _ -> ifErrorThunk ()
+        | Error e -> ifErrorThunk e
 
     /// Same as defaultValue for a result where the Ok value is unit. The name
     /// describes better what is actually happening in this case.

tests/FsToolkit.ErrorHandling.JobResult.Tests/JobResult.fs

@@ -94,26 +94,6 @@ let map2Tests =
     ]
 
 
-[<Tests>]
-let foldResultTests =
-
-    testList "JobResult.foldResult tests" [
-        testCase "foldResult with Task(Ok x)"
-        <| fun _ ->
-            createPostSuccess validCreatePostRequest
-            |> JobResult.foldResult (fun (PostId id) -> id.ToString()) string
-            |> runJobSync
-            |> Expect.same (newPostId.ToString())
-
-        testCase "foldResult with Task(Error x)"
-        <| fun _ ->
-            createPostFailure validCreatePostRequest
-            |> JobResult.foldResult string (fun ex -> ex.Message)
-            |> runJobSync
-            |> Expect.same (commonEx.Message)
-    ]
-
-
 [<Tests>]
 let mapErrorTests =
     testList "JobResult.mapError tests" [
@@ -467,13 +447,13 @@ let defaultWithTests =
     testList "JobResult.defaultWith Tests" [
         testCase "defaultWith returns the ok value"
         <| fun _ ->
-            let v = JobResult.defaultWith (fun () -> 43) (toJob (Ok 42))
+            let v = JobResult.defaultWith (fun _ -> 43) (toJob (Ok 42))
 
             Expect.hasJobValue 42 v
 
         testCase "defaultValue invoks the given thunk for Error"
         <| fun _ ->
-            let v = JobResult.defaultWith (fun () -> 42) (toJob (Error err))
+            let v = JobResult.defaultWith (fun _ -> 42) (toJob (Error err))
 
             Expect.hasJobValue 42 v
     ]

tests/FsToolkit.ErrorHandling.TaskResult.Tests/TaskResult.fs

@@ -96,27 +96,6 @@ let map2Tests =
             |> Expect.hasTaskErrorValueSync getFollowersEx
     ]
 
-
-[<Tests>]
-let foldResultTests =
-
-    testList "TaskResult.foldResult tests" [
-        testCase "foldResult with Task(Ok x)"
-        <| fun _ ->
-            createPostSuccess validCreatePostRequest
-            |> TaskResult.foldResult (fun (PostId id) -> id.ToString()) string
-            |> runTaskSync
-            |> Expect.same (newPostId.ToString())
-
-        testCase "foldResult with Task(Error x)"
-        <| fun _ ->
-            createPostFailure validCreatePostRequest
-            |> TaskResult.foldResult string (fun ex -> ex.Message)
-            |> runTaskSync
-            |> Expect.same (commonEx.Message)
-    ]
-
-
 [<Tests>]
 let mapErrorTests =
     testList "TaskResult.mapError tests" [
@@ -469,13 +448,13 @@ let defaultWithTests =
     testList "TaskResult.defaultWith Tests" [
         testCase "defaultWith returns the ok value"
         <| fun _ ->
-            let v = TaskResult.defaultWith (fun () -> 43) (toTask (Ok 42))
+            let v = TaskResult.defaultWith (fun _ -> 43) (toTask (Ok 42))
 
             Expect.hasTaskValue 42 v
 
         testCase "defaultValue invoks the given thunk for Error"
         <| fun _ ->
-            let v = TaskResult.defaultWith (fun () -> 42) (toTask (Error err))
+            let v = TaskResult.defaultWith (fun _ -> 42) (toTask (Error err))
 
             Expect.hasTaskValue 42 v
     ]

tests/FsToolkit.ErrorHandling.Tests/AsyncResult.fs

@@ -436,12 +436,12 @@ let defaultErrorTests =
 let defaultWithTests =
     testList "AsyncResult.defaultWith Tests" [
         testCaseAsync "defaultWith returns the ok value"
-        <| (let v = AsyncResult.defaultWith (fun () -> 43) (toAsync (Ok 42))
+        <| (let v = AsyncResult.defaultWith (fun _ -> 43) (toAsync (Ok 42))
 
             Expect.hasAsyncValue 42 v)
 
         testCaseAsync "defaultValue invoks the given thunk for Error"
-        <| (let v = AsyncResult.defaultWith (fun () -> 42) (toAsync (Error err))
+        <| (let v = AsyncResult.defaultWith (fun _ -> 42) (toAsync (Error err))
 
             Expect.hasAsyncValue 42 v)
     ]

tests/FsToolkit.ErrorHandling.Tests/Result.fs

@@ -132,28 +132,6 @@ let applyTests =
             |> Expect.hasErrorValue emptyTweetErrMsg
     ]
 
-
-let foldTests =
-
-    testList "Result.fold tests" [
-        testCase "fold with Ok"
-        <| fun _ ->
-            let actual =
-                Tweet.TryCreate "foobar"
-                |> Result.fold (fun t -> t.Value) id
-
-            Expect.equal actual "foobar" "fold to string should succeed"
-
-        testCase "fold with Error"
-        <| fun _ ->
-            let actual =
-                Tweet.TryCreate ""
-                |> Result.fold (fun t -> t.Value) id
-
-            Expect.equal actual emptyTweetErrMsg "fold to string should fail"
-    ]
-
-
 let ofChoiceTests =
 
     testList "Result.ofChoice tests" [
@@ -504,13 +482,13 @@ let defaultWithTests =
     testList "defaultWith Tests" [
         testCase "defaultWith returns the ok value"
         <| fun _ ->
-            let v = Result.defaultWith (fun () -> 43) (Ok 42)
+            let v = Result.defaultWith (fun _ -> 43) (Ok 42)
 
             Expect.equal v 42 ""
 
         testCase "defaultValue invoks the given thunk for Error"
         <| fun _ ->
-            let v = Result.defaultWith (fun () -> 42) (Error err)
+            let v = Result.defaultWith (fun _ -> 42) (Error err)
 
             Expect.equal v 42 ""
     ]
@@ -821,7 +799,6 @@ let allTests =
         map2Tests
         map3Tests
         applyTests
-        foldTests
         ofChoiceTests
         resultCETests
         resultOperatorsTests