Focal.Json 0.9.2

There is a newer version of this package available.
See the version list below for details.
dotnet add package Focal.Json --version 0.9.2
NuGet\Install-Package Focal.Json -Version 0.9.2
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="Focal.Json" Version="0.9.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Focal.Json --version 0.9.2
#r "nuget: Focal.Json, 0.9.2"
#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.
// Install Focal.Json as a Cake Addin
#addin nuget:?package=Focal.Json&version=0.9.2

// Install Focal.Json as a Cake Tool
#tool nuget:?package=Focal.Json&version=0.9.2


Lenses/Prisms/Traversals/etc. with an emphasis on usability in the F# programming environment

    `IFold<'s,'a>` <|-- `IGetter<'s,'a>`
    `ISetter<'s,'t,'a,'b>` <|-- `ITraversal<'s,'t,'a,'b>`
    `IFold<'s,'a>` <|-- `ITraversal<'s,'t,'a,'b>`
    `ITraversal<'s,'t,'a,'b>` <|-- `ILens<'s,'t,'a,'b>`
    `IGetter<'s,'a>` <|-- `ILens<'s,'t,'a,'b>`
    `ITraversal<'s,'t,'a,'b>` <|-- `IPrism<'s,'t,'a,'b>`
    class `IFold<'s,'a>` {
        ToSeq: ('s) -> seq<'a>
        ComposeWith: (IFold<'a,'b>) -> IFold<'s,'b>
    class `ISetter<'s,'t,'a,'b>` {
        Over: ('a -> 'b) -> 's -> 't
        ComposeWith: (ISetter<'a,'b,'c,'d>) -> ISetter<'s,'t,'c,'d>
    class `IGetter<'s,'a>` {
        Get: ('s) -> 'a
        ComposeWith: (IGetter<'a,'b>) -> IGetter<'s,'b>
    class `ITraversal<'s,'t,'a,'b>` {
        ComposeWith: (ITraversal<'a,'b,'c,'d>) -> ITraversal<'s,'t,'c,'d>
    class `ILens<'s,'t,'a,'b>` {
        ComposeWith: (ILens<'a,'b,'c,'d>) -> ILens<'s,'t,'c,'d>
    class `IPrism<'s,'t,'a,'b>` {
        Which: ('s) -> Result<'a,'t>
        Unto: ('b) -> 't
        ComposeWith: (IPrism<'a,'b,'c,'d>) -> IPrism<'s,'t,'c,'d>

Design Goals

The purpose of this project is to create an optics library that fits as well as possible into idiomatic F# code. This is largely accomplished by a combination of an explicitly defined interface hierarchy for the main optics types, and complimented by extension methods to allow for composing optics using a Fluent-like interface. The instances of said interfaces are implemented as records of matching fuctions. This is a large departure from the lens or optics libraries in Haskell, which rely on a much more powerful type system (and thus are capable of expressing far more that can be done within the confines of the F# type system).

That said, it is still possible to create very useful optics expressions, especially when paired with recursive type structures (as seen in Focal.Json) or code generation (as is done in FsGrpc).

Product Compatible and additional computed target framework versions.
.NET net6.0 is compatible.  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. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

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GitHub repositories

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Version Downloads Last updated
0.10.0 90 3/21/2024
0.9.3 882 5/10/2023
0.9.2 122 5/9/2023