Focal.Core 0.10.0

dotnet add package Focal.Core --version 0.10.0
NuGet\Install-Package Focal.Core -Version 0.10.0
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="Focal.Core" Version="0.10.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Focal.Core --version 0.10.0
#r "nuget: Focal.Core, 0.10.0"
#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.
// Install Focal.Core as a Cake Addin
#addin nuget:?package=Focal.Core&version=0.10.0

// Install Focal.Core as a Cake Tool
#tool nuget:?package=Focal.Core&version=0.10.0


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. In exchange for a reduced level of expressiveness, we are able to make heavy use of the auto-complete features available for F# in VSCode and Visual Studio.


JSON Examples

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. 
.NET Core netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.1 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen 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.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on Focal.Core:

Package Downloads

gRPC and Protocol Buffer compiler for F# projects


Code generation for idiomatic F# code generation from protocol buffers


Lenses/Prisms/Traversals/etc. for FSharp.Data.JsonValue types

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
0.10.0 686 3/21/2024
0.9.3 1,097 5/10/2023
0.9.2 5,797 5/9/2023