MonadCraft 0.15.0

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package MonadCraft --version 0.15.0
                    


                    

                
NuGet\Install-Package MonadCraft -Version 0.15.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="MonadCraft" Version="0.15.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="MonadCraft" Version="0.15.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="MonadCraft" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add MonadCraft --version 0.15.0
                    


                    

                
#r "nuget: MonadCraft, 0.15.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package MonadCraft@0.15.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=MonadCraft&version=0.15.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=MonadCraft&version=0.15.0
                    


                            Install as a Cake Tool

MonadCraft

Lightweight Optional and Result types with async helpers, LINQ support, and single-assert test coverage.

Installation

dotnet add package MonadCraft

Quickstart

Optional

var maybeName = Optional.Some("Ada");

var greeting = maybeName
	.Select(name => name.ToUpperInvariant())
	.Where(name => name.StartsWith('A'))
	.OrElse(Optional.None<string>())
	.GetValueOrDefault("Guest");

var safeNumber = Optional.Try(() => int.Parse("12"));

Result

var parsed = Result.Try<string, int>(
	() => int.Parse("42"),
	ex => ex.Message);

var validated = await parsed
	.EnsureAsync(value => Task.FromResult(value > 0), "must be positive")
	.RecoverAsync(error => Task.FromResult(-1));

var projection =
	from a in Result.Success<string, int>(2)
	from b in Result.Success<string, int>(3)
	select a + b; // 5

Key APIs

  • Optional<T>: Some, None, Try, Match/MatchAsync, Map/MapAsync, Bind/BindAsync, OnSome/OnNone (+ async), Where, OrElse, GetValueOrDefault, GetValueOrElse, ToEnumerable, ToResult.
  • Result<TError, TValue>: Success, Failure, Try/TryAsync, Match/MatchAsync, Map/MapAsync, MapError/MapErrorAsync, Bind/BindAsync, Ensure/EnsureAsync, Recover/RecoverAsync, OnSuccess/OnFailure (+ async), Switch/SwitchAsync overloads, GetValueOrDefault, GetValueOrElse, ToOptional.
  • Async extensions: OptionAsyncExtensions and ResultAsyncExtensions mirror the sync APIs for Task<Optional<T>> and Task<Result<TError,TValue>> (including OrElseAsync, EnsureAsync, RecoverAsync, ToOptionalAsync).

LINQ support

Both Optional<T> and Result<TError, TValue> implement Select/SelectMany so you can compose with query syntax.

var total =
	from a in Optional.Some(1)
	from b in Optional.Some(2)
	select a + b; // Some(3)

var combined =
	from a in Result.Success<string, int>(1)
	from b in Result.Success<string, int>(2)
	select a + b; // Success(3)
Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • net10.0

    • No dependencies.

  • net8.0

    • No dependencies.

  • net9.0

    • No dependencies.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on MonadCraft:

Package Downloads
RollCraft

A sophisticated library for creating dice expressions in .NET

GitHub repositories

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Version Downloads Last Updated
0.15.0 699 12/11/2025
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