FsToolkit.ErrorHandling.AsyncSeq
4.8.0
See the version list below for details.
dotnet add package FsToolkit.ErrorHandling.AsyncSeq --version 4.8.0
NuGet\Install-Package FsToolkit.ErrorHandling.AsyncSeq -Version 4.8.0
<PackageReference Include="FsToolkit.ErrorHandling.AsyncSeq" Version="4.8.0" />
paket add FsToolkit.ErrorHandling.AsyncSeq --version 4.8.0
#r "nuget: FsToolkit.ErrorHandling.AsyncSeq, 4.8.0"
// Install FsToolkit.ErrorHandling.AsyncSeq as a Cake Addin
#addin nuget:?package=FsToolkit.ErrorHandling.AsyncSeq&version=4.8.0
// Install FsToolkit.ErrorHandling.AsyncSeq as a Cake Tool
#tool nuget:?package=FsToolkit.ErrorHandling.AsyncSeq&version=4.8.0
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 and .NET Framework 4.6.1 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
Requirements
- .NET Core SDK
- Node
- v16.0.0 or LTS
- Not required but recommend that you use NVM to easily manage multiple versions of Node
Compiling
> build.cmd <optional buildtarget> // on windows
$ ./build.sh <optional buildtarget>// on unix
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)
<a href="https://www.ajira.tech"><img src="./Ajira-logo.png" alt="Ajira Technologies, India" width="200" /></a>
Product | Versions 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. |
.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. |
-
.NETStandard 2.0
- FSharp.Control.AsyncSeq (>= 3.2.1)
- FsToolkit.ErrorHandling (>= 4.8.0)
-
.NETStandard 2.1
- FSharp.Control.AsyncSeq (>= 3.2.1)
- FsToolkit.ErrorHandling (>= 4.8.0)
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 |
---|---|---|
4.15.2 | 46 | 5/2/2024 |
4.15.2-beta001 | 32 | 5/2/2024 |
4.15.1 | 430 | 1/15/2024 |
4.15.0 | 7,277 | 1/10/2024 |
4.14.0 | 248 | 1/2/2024 |
4.13.0 | 139 | 12/10/2023 |
4.13.0-beta002 | 92 | 12/10/2023 |
4.13.0-beta001 | 77 | 12/10/2023 |
4.12.0 | 130 | 11/27/2023 |
4.11.1 | 116 | 11/23/2023 |
4.11.0 | 113 | 11/11/2023 |
4.10.0 | 147 | 10/16/2023 |
4.9.0 | 2,001 | 7/10/2023 |
4.8.0 | 141 | 7/7/2023 |
4.7.0 | 140 | 6/21/2023 |
4.7.0-beta001 | 88 | 6/21/2023 |
4.6.0 | 2,675 | 4/20/2023 |
4.6.0-beta001 | 80 | 4/20/2023 |
4.5.0 | 1,055 | 3/27/2023 |
4.5.0-beta002 | 95 | 3/19/2023 |
4.5.0-beta001 | 104 | 3/6/2023 |
4.4.0 | 233 | 2/21/2023 |
4.3.0 | 293 | 1/20/2023 |
4.2.1 | 267 | 12/19/2022 |
4.2.0 | 283 | 12/17/2022 |
4.1.0 | 252 | 12/13/2022 |
4.1.0-beta001 | 89 | 12/13/2022 |
4.0.0 | 363 | 11/19/2022 |
4.0.0-beta001 | 107 | 11/19/2022 |
3.3.1 | 41,256 | 11/19/2022 |
3.3.1-beta004 | 100 | 11/19/2022 |
3.3.1-beta003 | 109 | 11/18/2022 |
3.3.1-beta002 | 95 | 11/18/2022 |
3.3.1-beta001 | 118 | 11/18/2022 |
3.3.0-beta001 | 118 | 11/9/2022 |
3.2.0 | 4,488 | 10/31/2022 |
3.2.0-beta001 | 94 | 10/31/2022 |
3.1.0 | 475 | 10/19/2022 |
3.0.1 | 365 | 10/18/2022 |
3.0.0 | 406 | 10/14/2022 |
3.0.0-beta008 | 125 | 10/14/2022 |
3.0.0-beta007 | 9,117 | 4/15/2022 |
3.0.0-beta006 | 121 | 4/5/2022 |
3.0.0-beta005 | 142 | 4/5/2022 |
3.0.0-beta004 | 116 | 4/5/2022 |
3.0.0-beta003 | 114 | 3/30/2022 |
3.0.0-beta002 | 133 | 2/21/2022 |
3.0.0-beta001 | 135 | 2/21/2022 |
2.13.0 | 6,596 | 1/11/2022 |
2.13.0-beta001 | 149 | 1/11/2022 |
2.12.0 | 252 | 1/6/2022 |
2.12.0-beta001 | 140 | 1/6/2022 |
2.11.1 | 1,322 | 12/1/2021 |
2.11.1-beta001 | 751 | 12/1/2021 |
2.11.0 | 3,205 | 11/24/2021 |
2.11.0-beta004 | 3,146 | 11/24/2021 |
2.11.0-beta002 | 3,152 | 11/24/2021 |
2.11.0-beta001 | 3,072 | 11/24/2021 |
- [Added cancellableTaskValidation feature, tests, and documentation](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/217) Credits @1eyewonder