FsToolkit.ErrorHandling.JobResult 5.0.0-beta004

This is a prerelease version of FsToolkit.ErrorHandling.JobResult.

There is a newer version of this package available.
See the version list below for details.

dotnet add package FsToolkit.ErrorHandling.JobResult --version 5.0.0-beta004

NuGet\Install-Package FsToolkit.ErrorHandling.JobResult -Version 5.0.0-beta004

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="FsToolkit.ErrorHandling.JobResult" Version="5.0.0-beta004" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="FsToolkit.ErrorHandling.JobResult" Version="5.0.0-beta004" />
                    

                            Directory.Packages.props

<PackageReference Include="FsToolkit.ErrorHandling.JobResult" />
                    

                            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 FsToolkit.ErrorHandling.JobResult --version 5.0.0-beta004

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: FsToolkit.ErrorHandling.JobResult, 5.0.0-beta004"

#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 FsToolkit.ErrorHandling.JobResult@5.0.0-beta004

#: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=FsToolkit.ErrorHandling.JobResult&version=5.0.0-beta004&prerelease
                    

                            Install as a Cake Addin

#tool nuget:?package=FsToolkit.ErrorHandling.JobResult&version=5.0.0-beta004&prerelease
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

FsToolkit.ErrorHandling

FsToolkit.ErrorHandling is a utility library to work with the Result type in F#, and allows you to do clear, simple and powerful error handling.

The library provides utility functions like map, bind, apply, traverse, sequence as well as computation expressions and infix operators to work with Result<'a, 'b>, Result<'a option, 'b>, Async<Result<'a, 'b>>, Async<Result<'a option, 'b>>, and Result<'a, 'b list>.

It was inspired by Chessie and Cvdm.ErrorHandling (the latter has now been merged into FsToolkit.ErrorHandling).

FsToolkit.ErrorHandling targets .NET Standard 2.0, .NET Standard2.1 and supports Fable.

Documentation

The documentation is available here.

Further material

The main resource as to learning this style of programming Railway Oriented Programming
However Result isn't a panacea, see what pitfalls and where you shouldn't use Result. In defense of Exceptions: Throw (away) your Result

Builds

GitHub Actions

NuGet

Package name	Release	Prelease
FsToolkit.ErrorHandling
FsToolkit.ErrorHandling.TaskResult
FsToolkit.ErrorHandling.JobResult
FsToolkit.ErrorHandling.AsyncSeq
FsToolkit.ErrorHandling.IcedTasks

Developing locally

Devcontainer

This repository has a devcontainer setup for VSCode. For more infomation see:

VSCode

Local Setup

.NET Core SDK
- v6.x
- v7.x
- v8.x

Optional

To test fable builds locally you will need:

Node
- v18.0.0 or Higher
- Not required but recommend that you use NVM to easily manage multiple versions of Node
Python
- v3.10.0 or higher
- Required for Fable-Python

Compiling

> build.cmd <optional buildtarget> // on windows
$ ./build.sh  <optional buildtarget>// on unix

Without specifying a build target, the default target is DotnetPack, which will run tests for all projects on dotnet and then pack the projects into nuget packages. For additional notable targets see below.

Build Targets

Clean - Will clean all projects bin and obj folders
DotnetTest - Will run tests for dotnet projects
NpmTest - Will run tests for fable-javascript projects
PythonTest - Will run tests for fable-python projects
RunTests - Will run tests for dotnet, fable-javascript and fable-python projects
FormatCode - Will run fantomas to format the codebase

This is not an exhausting list. Additional targets can be found in the ./build/build.fs file.

A motivating example

This example of composing a login flow shows one example of how this library can aid in clear, simple, and powerful error handling, using just a computation expression and a few helper functions. (The library has many more helper functions and computation expressions as well as infix operators; see the documentation for details.)

// Given the following functions:
//   tryGetUser: string -> Async<User option>
//   isPwdValid: string -> User -> bool
//   authorize: User -> Async<Result<unit, AuthError>>
//   createAuthToken: User -> Result<AuthToken, TokenError>

type LoginError = InvalidUser | InvalidPwd | Unauthorized of AuthError | TokenErr of TokenError

let login (username: string) (password: string) : Async<Result<AuthToken, LoginError>> =
  asyncResult {
    // requireSome unwraps a Some value or gives the specified error if None
    let! user = username |> tryGetUser |> AsyncResult.requireSome InvalidUser

    // requireTrue gives the specified error if false
    do! user |> isPwdValid password |> Result.requireTrue InvalidPwd

    // Error value is wrapped/transformed (Unauthorized has signature AuthError -> LoginError)
    do! user |> authorize |> AsyncResult.mapError Unauthorized

    // Same as above, but synchronous, so we use the built-in mapError
    return! user |> createAuthToken |> Result.mapError TokenErr
  }

Sponsor(s)

Product	Compatible and additional computed target framework versions.
.NET	net5.0 was computed. net5.0-windows was computed. net6.0 was computed. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 was computed. 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.
.NET Core	netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed.
.NET Standard	netstandard2.0 is compatible. netstandard2.1 is compatible.
.NET Framework	net461 was computed. net462 was computed. net463 was computed. net47 was computed. net471 was computed. net472 was computed. net48 was computed. net481 was computed.
MonoAndroid	monoandroid was computed.
MonoMac	monomac was computed.
MonoTouch	monotouch was computed.
Tizen	tizen40 was computed. tizen60 was computed.
Xamarin.iOS	xamarinios was computed.
Xamarin.Mac	xamarinmac was computed.
Xamarin.TVOS	xamarintvos was computed.
Xamarin.WatchOS	xamarinwatchos was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

.NETStandard 2.0
- FSharp.Core (>= 6.0.1)
- FsToolkit.ErrorHandling (>= 5.0.0-beta004)
- Hopac (>= 0.5.1)
- Microsoft.Bcl.AsyncInterfaces (>= 6.0.0)
.NETStandard 2.1
- FSharp.Core (>= 6.0.1)
- FsToolkit.ErrorHandling (>= 5.0.0-beta004)
- Hopac (>= 0.5.1)

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
5.0.1	101	7/12/2025
5.0.0	160	6/2/2025
5.0.0-beta014	143	6/2/2025
5.0.0-beta013	142	5/29/2025
5.0.0-beta012	148	5/1/2025
5.0.0-beta011	160	3/30/2025
5.0.0-beta010	121	3/21/2025
5.0.0-beta009	208	3/5/2025
5.0.0-beta008	110	3/2/2025
5.0.0-beta007	99	2/23/2025
5.0.0-beta006	101	2/21/2025
5.0.0-beta005	104	2/16/2025
5.0.0-beta004	113	2/4/2025
5.0.0-beta003	103	1/6/2025
5.0.0-beta002	108	12/21/2024
5.0.0-beta001	114	12/7/2024
4.18.0	234	10/23/2024
4.18.0-beta001	100	10/23/2024
4.17.0	168	9/23/2024
4.17.0-beta002	98	9/23/2024
4.17.0-beta001	112	9/23/2024
4.16.0	166	7/15/2024
4.15.3	151	7/14/2024
4.15.3-beta001	108	7/14/2024
4.15.2	153	5/2/2024
4.15.2-beta001	88	5/2/2024
4.15.1	241	1/15/2024
4.15.0	175	1/10/2024
4.14.0	177	1/2/2024
4.13.0	214	12/10/2023
4.13.0-beta002	129	12/10/2023
4.13.0-beta001	139	12/10/2023
4.12.0	185	11/27/2023
4.11.1	155	11/23/2023
4.11.0	173	11/11/2023
4.10.0	192	10/16/2023
4.9.0	262	7/10/2023
4.8.0	207	7/7/2023
4.7.0	228	6/21/2023
4.7.0-beta001	164	6/21/2023
4.6.0	261	4/20/2023
4.6.0-beta001	184	4/20/2023
4.5.0	284	3/27/2023
4.5.0-beta002	199	3/19/2023
4.5.0-beta001	184	3/6/2023
4.4.0	339	2/21/2023
4.3.0	381	1/20/2023
4.2.1	368	12/19/2022
4.2.0	399	12/17/2022
4.1.0	337	12/13/2022
4.1.0-beta001	191	12/13/2022
4.0.0	431	11/19/2022
4.0.0-beta001	207	11/19/2022
3.3.1	412	11/19/2022
3.3.1-beta004	192	11/19/2022
3.3.1-beta003	208	11/18/2022
3.3.1-beta002	203	11/18/2022
3.3.1-beta001	204	11/18/2022
3.3.0-beta001	216	11/9/2022
3.2.0	467	10/31/2022
3.2.0-beta001	200	10/31/2022
3.1.0	494	10/19/2022
3.0.1	430	10/18/2022
3.0.0	446	10/14/2022
3.0.0-beta008	217	10/14/2022
3.0.0-beta007	259	4/15/2022
3.0.0-beta006	233	4/5/2022
3.0.0-beta005	224	4/5/2022
3.0.0-beta004	227	4/5/2022
3.0.0-beta003	226	3/30/2022
3.0.0-beta002	231	2/21/2022
3.0.0-beta001	225	2/21/2022
2.13.0	635	1/11/2022
2.13.0-beta001	250	1/11/2022
2.12.0	379	1/6/2022
2.12.0-beta001	250	1/6/2022
2.11.1	1,023	12/1/2021
2.11.1-beta001	849	12/1/2021
2.11.0	3,393	11/24/2021
2.11.0-beta004	3,288	11/24/2021
2.11.0-beta002	3,184	11/24/2021
2.11.0-beta001	3,075	11/24/2021
2.10.0	433	11/13/2021
2.9.0	428	11/10/2021
2.9.0-beta001	280	11/10/2021
2.8.1	464	11/7/2021
2.8.0	460	11/7/2021
2.8.0-beta001	363	11/7/2021
2.7.1	464	10/19/2021
2.7.1-beta001	318	10/19/2021
2.7.0	620	8/2/2021
2.7.0-beta001	335	8/2/2021
2.6.0	433	7/7/2021
2.6.0-beta001	331	7/7/2021
2.5.0	527	5/26/2021
2.5.0-beta001	309	5/26/2021
2.4.0	467	5/23/2021
2.4.0-beta001	321	5/23/2021
2.3.0	423	5/14/2021
2.3.0-beta002	312	5/14/2021
2.2.0	447	4/21/2021
2.1.2	517	2/27/2021
2.1.1	458	2/26/2021
2.1.1-beta001	315	2/26/2021
2.1.0	532	2/26/2021
2.1.0-beta003	399	2/26/2021
2.1.0-beta002	351	2/25/2021
2.1.0-beta001	351	2/25/2021
2.0.0	858	11/20/2020
2.0.0-beta002	466	11/18/2020
2.0.0-beta001	457	8/29/2020
1.4.3	915	7/22/2020
1.4.0	691	6/5/2020
1.3.2	650	6/5/2020
1.3.1	686	5/29/2020
1.3.1-beta001	501	5/25/2020
1.3.0	699	5/25/2020
1.3.0-beta006	497	5/25/2020
1.3.0-beta005	531	5/25/2020
1.3.0-beta004	481	5/12/2020
1.2.6	747	2/15/2020
1.2.5	765	10/18/2019
1.2.4	683	10/10/2019
1.2.3	788	7/22/2019
1.2.2	760	5/31/2019
1.2.1	772	5/22/2019

- BREAKING: [Remove Ply and update to FSharp 6](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/248) Credits @TheAngryByrd
- BREAKING: [Remove MergeSources (and!) from some implementations like Result](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/261) Credits @TheAngryByrd
- BREAKING: [Merge TaskResult into Core library](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/285) Credits @TheAngryByrd
- This means FsToolkit.ErrorHandling.TaskResult is no longer a separate package and will not be updated. It is now part of the core library.
- BREAKING: [Rename retn to singleton](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/287) Credits @1eyewonder
- [Use Microsoft.Bcl.AsyncInterfaces in netstandard2.0 (Allows IAsyncDisposable and IAsyncEnumerable)](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/250) Credits @TheAngryByrd
- [Build against Net8](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/251) Credits @TheAngryByrd
- [Fix Overload Resolution to Align to Computation Expression used](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/252) Credits @TheAngryByrd
- [refactor!: Seq.sequenceResultM returns Array instead of seq](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/255) Credits @bartelink
- [feat(Seq): sequenceResultA](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/255) Credits @bartelink
- [Updated uses of Seq.append](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/290) Credits @1eyewonder
- [Add Option.traverseAsync and Option.sequenceAsync](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/298#event-15827853276) Credits @tw0po1nt
- [Add Require and Check helper methods](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/295) Credits @PI-Gorbo
- [Add new AsyncOption APIs and document all its other functions; minor fixes to documentation for Option module](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/307) Credits @tw0po1nt