libanvl.opt 2.4.4-rc

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher.
This is a prerelease version of libanvl.opt.
There is a newer prerelease version of this package available.
See the version list below for details. 
dotnet add package libanvl.opt --version 2.4.4-rc
                    


                    

                
NuGet\Install-Package libanvl.opt -Version 2.4.4-rc
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="libanvl.opt" Version="2.4.4-rc" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="libanvl.opt" Version="2.4.4-rc" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="libanvl.opt" />
                    


                            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 libanvl.opt --version 2.4.4-rc
                    


                    

                
#r "nuget: libanvl.opt, 2.4.4-rc"
#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 libanvl.opt@2.4.4-rc
#: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=libanvl.opt&version=2.4.4-rc&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=libanvl.opt&version=2.4.4-rc&prerelease
                    


                            Install as a Cake Tool

CI CodeQL Nuget (with prereleases) codecov

libanvl.Opt

A null-free optional value library for .NET.

  • An optional value is represented as the struct Opt<T>

See the Examples Tests for more on how to use Opt.

Requirements

.NET 8

Releases

  • NuGet packages are available on NuGet.org
    • Embedded debug symbols
    • Source Link enabled
  • NuGet packages from CI builds are available on the libanvl GitHub feed

Features

  • Immutable
  • Use Opt<T> instead of T? for optional values
  • Implicit conversion from T to Opt<T>
  • Deep selection of properties in complex objects
  • SomeOrDefault() for any type
  • Explicitly opt-in to exceptions with Unwrap()
  • Cast inner value to compatible type with Cast<U>()
  • SomeOrEmpty() for string and enumerables
  • Opts of IEnumerable<T> are iterable

Examples

class Car
{
	public string Driver { get; set;}
}

public void AcceptOptionalValue(Opt<Car> optCar, Opt<string> optName)
{
	if (optCar.IsSome)
	{
		optCar.Unwrap().Driver = optName.SomeOr("Default Driver");
	}

	if (optCar.IsNone)
	{
		throw new Exception();
	}

	// or use Unwrap() to throw for None

	Car bcar = optCar.Unwrap();
}

public void RunCarOperations()
{
	var acar = new Car();
	AcceptOptionalValue(acar, "Rick");

	Car? nocar = null;
	AcceptOptionalValue(Opt.From(nocar), Opt<string>.None)

	// use Select to project to an Opt of an inner property
	Opt<string> driver = acar.Select(x => x.Driver);
}
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 was computed.  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 was computed.  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.

  • net8.0

    • No dependencies.

NuGet packages (2)

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Package Downloads
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GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
2.7.7-beta 791 1/3/2025
2.7.6-beta 101 1/3/2025
2.7.5-beta 93 1/1/2025
2.6.11-beta 73 12/28/2024
2.5.4-rc 79 12/19/2024
2.4.4-rc 77 12/19/2024
2.3.7-rc 80 12/16/2024
2.2.14-rc 87 12/7/2024
2.1.9-rc 87 12/7/2024

https://github.com/libanvl/opt/releases/tag/v2.4.4-rc