FSharp.Interop.NullOptAble

Missing OptionBuilder for F# filling the void to interop with C#'s ?. usage. It works with Nulls, Options, Nullables.

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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

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.

Operator Examples

This library also has some operators available when specifically included

using FSharp.Interop.NullOptAble.Operators

You can find examples of them in Tests/RealWorldOperators.fs.