Merge pull request #8 from dbosoft/pull/eitherextensions

ToEitherRight
ToEitherLeft
IfNoneAsync

+semver: major

due to update of Language.Ext to 4.0.3

Author: fw2568

src/Dbosoft.Functional/Dbosoft.Functional.csproj

@@ -16,11 +16,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="5.6.8">
+    <PackageReference Include="GitVersion.MsBuild" Version="5.8.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="LanguageExt.Core" Version="3.4.15" />
+    <PackageReference Include="LanguageExt.Core" Version="4.0.3" />
     <PackageReference Include="System.Threading.Tasks.Dataflow" Version="5.0.0" />
   </ItemGroup>
 

src/Dbosoft.Functional/EitherExtensions.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using LanguageExt;
+using LanguageExt.Common;
+
+namespace Dbosoft.Functional
+{
+    public static class EitherExtensions
+    {
+        
+        public static Task<Either<Error, TIn>> ToEitherRight<TIn>(this TIn right)
+        {
+            return Prelude.RightAsync<Error, TIn>(right).ToEither();
+        }
+
+        public static Task<Either<Error, TIn>> ToEitherLeft<TIn>(this Error error)
+        {
+            return Prelude.LeftAsync<Error, TIn>(error).ToEither();
+        }
+
+        public static Task<Either<Error, TIn>> IfNoneAsync<TIn>(this Task<Either<Error, Option<TIn>>> either,
+            Func<Task<Either<Error, TIn>>> noneFunc)
+        {
+            return either.ToAsync().Bind(r => r.MatchAsync(
+                    s => Prelude.Right<Error, TIn>(s),
+                    None: noneFunc).ToAsync()
+            ).ToEither();
+        }
+    }
+}