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+ Sequential for Choice with (v)options #629

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+ Sequential for Choice with (v)options #629

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16 changes: 15 additions & 1 deletion src/FSharpPlus/Extensions/Extensions.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -336,6 +336,20 @@ module Extensions =
| ValueSome x -> Choice2Of2 x
#endif

/// Returns the Choice2Of2 if it contains an Choice2Of2 element, otherwise the option inside a Choice1Of2.
static member Sequential (t: option<Choice<'T, 'Choice2Of2>>) : Choice<'T option, 'Choice2Of2> =
match t with
| Some (Choice1Of2 x) -> Choice1Of2 (Some x)
| Some (Choice2Of2 x) -> Choice2Of2 x
| None -> Choice1Of2 None

/// Returns the Choice2Of2 if it contains an Choice2Of2 element, otherwise the option inside a Choice1Of2.
static member Sequential (t: voption<Choice<'T, 'Choice2Of2>>) : Choice<'T voption, 'Choice2Of2> =
match t with
| ValueSome (Choice1Of2 x) -> Choice1Of2 (ValueSome x)
| ValueSome (Choice2Of2 x) -> Choice2Of2 x
| ValueNone -> Choice1Of2 ValueNone


/// Returns all Choice2Of2's combined, otherwise a sequence of all Choice1Of2 elements.
static member Parallel (choice2Combiner, t: seq<Choice<'T1, 'T2>>) =
Expand Down Expand Up @@ -438,4 +452,4 @@ module Extensions =
match t with
| ValueSome (Ok x) -> Ok (ValueSome x)
| ValueNone -> Ok ValueNone
| ValueSome (Error x) -> Error x
| ValueSome (Error x) -> Error x
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