Since it looks like Microsoft is pushing dotnet-interactive into VS notebooks it would be great to have some reference documentation here on how we could use that instead of the REPL in Visual Studio or LINQPad.

When attempting dotnet restore or dotnet build, the system responds with

error NU1101: Unable to find package FeatherHttp. No packages exist with this id in source(s): fsCheck-appVeyor, nuget.org

Adding a source for FeatherHttp would solve this.

Does this repo mean that 2nd edition of your amazing book is coming...? ;)

Hi, TDE for the book here - pleased to meet you!

The certificate for dotnet.myget.org has expired and from what I read online, they're not planning to renew it at all. This line therefore causes issues with dotnet build - but at least in my environment, when I removed it entirely it "just worked" ("it" being dotnet restore && dotnet build), probably because dotnet-core can already be found in official NuGet repos?

Hi, I don’t get why Try delegate is returning Exceptional if it is Run()ks purpose to wrap the result of the lambda call. Invoking „raw” Try delegate can still throw exception but return type of Exceptinal suggests that ir will not happen or am I completly off here?

Hi. It seems that provided code does not build with net5.0 target. I have for example a couple of compiling errors in EnumerableExt.cs (inside LaYumba.Functional lib) such as:

public static (IEnumerable<T> Passed, IEnumerable<T> Failed) Partition<T>
      (
         this IEnumerable<T> source,
         Func<T, bool> predicate
      )
      {
         var grouped = source.GroupBy(predicate);
         return
         (
            // Argument 2: cannot convert from 'System.Collections.Generic.IEnumerable<T>' to 'System.Func<System.Linq.IGrouping<bool, T>, bool>'
            Passed: grouped.Where(g => g.Key).FirstOrDefault(Enumerable.Empty<T>()),
            Failed: grouped.Where(g => !g.Key).FirstOrDefault(Enumerable.Empty<T>())
         );
      }

Maybe FirstOrDefault in .net6.0 provides a new overload taking an Enumerable?

Just discovered that you're writing a 2nd edition! Excellent news, my copy is getting very dog-eared from having been read many times!

Anyway, without wishing to be rude, may I make a request (that may be too late). The only drawback I felt the book had was that you used your own library, instead of using Language-Ext. I understand the educational reasons for developing a library as you went along, but at the end of the day, you yourself recommend Language-Ext as "a more fully-fledged functional library."

Thing is, Language-Ext suffers badly from a lack of good documentation. Your book could easily be that documentation, making it even more useful than it already is. Even if you just added a small paragraph at the end of each section showing how the concepts and code you just described would be done in Language-Ext, it would give a kick-start to those of us who are keen to put your ideas into practice, but are struggling to translate them.

This is NOT meant in any way to put down La Yumba, it's meant as a constructive comment to give the book a whole new dimension.

Thanks for listening, and thanks for writing what is (in my opinion anyway) probably the most important C# book ever written. Really, I mean that, no flattery here!

Hi there,

It would great to enable Github discussions on this repository as I'm sure there are plenty of developers who have read the excellent book by Enrico and have further questions, I'm sure a small community could develop here.

Cheers

Jon

Hi there, My name is Steph Gill, I'm Community Engager from Event Store. Several of the team at Event Store have read your book and really enjoyed it, especially Alexey Zimarev and Yves Lorphelin. I'd love to talk to you a bit more about it! Can you please email me at [email protected] so we can talk further?

Thanks and have a good day!

Steph Gill