https://github.com/ekonbenefits/fsharp.interop.nulloptable

Missing OptionBuilder for F# filling the void to interop with C#'s ?. usage
https://github.com/ekonbenefits/fsharp.interop.nulloptable

fsharp monads null nullable option

Last synced: about 15 hours ago
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Missing OptionBuilder for F# filling the void to interop with C#'s ?. usage

• Host: GitHub
• URL: https://github.com/ekonbenefits/fsharp.interop.nulloptable
• Owner: ekonbenefits
• License: mit
• Created: 2018-04-14T01:22:21.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-11-15T21:54:36.000Z (11 months ago)
• Last Synced: 2025-09-08T18:45:44.932Z (29 days ago)
• Topics: fsharp, monads, null, nullable, option
• Language: F#
• Homepage: https://ekonbenefits.github.io/FSharp.Interop.NullOptAble/
• Size: 320 KB
• Stars: 5
• Watchers: 1
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# FSharp.Interop.NullOptAble [![NuGet Status](http://img.shields.io/nuget/v/FSharp.Interop.NullOptAble.svg?style=flat)](https://www.nuget.org/packages/FSharp.Interop.NullOptAble/)

Missing OptionBuilder for F# filling the void to interop with  C#'s `?.` usage.

It works with Nulls, Options, Nullables.

CI Builds available: [![MyGet Pre Release](https://img.shields.io/myget/ci-fsharp-optionbuilder/vpre/FSharp.Interop.NullOptAble.svg)](https://www.myget.org/feed/ci-fsharp-optionbuilder/package/nuget/FSharp.Interop.NullOptAble)

Build Statuses:

* Windows: [![Build status](https://ci.appveyor.com/api/projects/status/57yssc1q22p7j0y7/branch/master?svg=true)](https://ci.appveyor.com/project/jbtule/fsharp-interop-nulloptable/branch/master)

* Mac & Linux: [![Build Status](https://travis-ci.org/ekonbenefits/FSharp.Interop.NullOptAble.svg?branch=master)](https://travis-ci.org/ekonbenefits/FSharp.Interop.NullOptAble)

## Basic Info

There are more C# devs relying on the safe nav operator `?.` and so nulls will only get worse on the C# side, making it more likely null's are going to drop out of APIs.

This project creates an `option { }` computational expression and `chooseSeq { }` computational expression that allows binding `'T option`/`'T Nullable`/`'T:null` thus either returns an option or a sequence respectively.

With `chooseSeq` if you `yield!` another chooseSeq it will work recursively flatten or any sequence of `NonNullSeq`, list, or Set type. Any other sequence will be treated like a `T:null` object `yield!` and `let!` work with `'T option`/`'T Nullable`/`'T:null`

### Examples

```fsharp

let x = Nullable(3)

let y = Nullable(3)

option {

    let! x' = x

    let! y' = y

    return (x' + y')

} |> should equal (Some 6)

```

See more examples in [Tests/RealWorld.fs](https://ekonbenefits.github.io/FSharp.Interop.NullOptAble/RealWorld.html).

### Operator Examples

This library also has some operators available when specifically included

```fsharp

using FSharp.Interop.NullOptAble.Operators

```

You can find examples of them in [Tests/RealWorldOperators.fs](https://ekonbenefits.github.io/FSharp.Interop.NullOptAble/RealWorldOperators.html).