Microsoft/visualfsharp

The Visual F# compiler and tools

td-ideabox

@td-ideabox

There is definitely a .dll generated

So I'm guessing I need to change a build setting or something?

Also thanks for your time!

Victor Peter Rouven Müller

@realvictorprm

Looks like. Sure no problem

td-ideabox

@td-ideabox

K, I'm working in Rider. Couldn't get things to play nice in Ionide.

I chose a Console Application

Victor Peter Rouven Müller

@realvictorprm

Console Application should work out

Alternatively you can try running the all although I'm a bit confused at this point :smile:

*dll=all

td-ideabox

@td-ideabox

So give mono <something>.dll a shot, k

Hmm, didn't do anything.

Victor Peter Rouven Müller

@realvictorprm

:confused: darn

I'm not familiar with Rider

Alternatively ask on the fsharp forums or in the Fsharp slack :smiley:

td-ideabox

@td-ideabox

Hah! so looking at the Rider output running a build, the command to get things happening is dotnet something.dll

And it works!

Thanks for rubberducking for me @realvictorprm !

Victor Peter Rouven Müller

@realvictorprm

Ah dotnet ja tue command kg used with .Met Code

Sorry german keyboard lol

No problem, I'm glad it works now for you :+1:

td-ideabox

@td-ideabox

So I can't get Ionide to see the packages I'm adding with Paket on OSX. Here's a vid of me creating a fresh project and trying to get JsonProviders, am I doing something wrong?

halp-with-ionide.mp4

Georg Haaser

@krauthaufen

https://github.com/krauthaufen/SwitchToNewThreadIssue

sorry wrong chat :-D

Leo Cavalcante

@leocavalcante

Hi folks, I'm reading about F# and trying to apply it to my daily job.
I was already been able to load a CSV file with the help of FSharp.Data from NuGet, but I did it a imperative style, I think. Now I'm trying to apply functional constructs, tried the following:

open System
open System.IO
open FSharp.Data

[<EntryPoint>]
let main argv =
  let data =
    argv.[0]
    |> Path.Combine Environment.CurrentDirectory
    |> CsvFile.Load

  printfn "%A" data.Headers

  0

What I'm missing here?
In my head argv.[0] is passed to the result of Path.Combine Environment.CurrentDirectory which curried already have the current dir as the first path then the combined result is given to CsvFile.Load.
Did I get |> and curring wrong?

Diego Esmerio

@Nhowka

I believe that you must use the tupled form as Path.Combine don't support currying

But the next step to CsvFile.Load is probably ok

Alexander Prooks

@aprooks

I usually create small F# helpers which adapt C# methods to F# functions. Makes much easier to consume and debug type inference issues if any

Yemi Bedu @ P&R

@pr-yemibedu

and it is okay to not always use the fluid style. you can make the intermittent let bindings and just get things done.

kelas

@kelas6666_twitter

hi Guys
in javascript I can write something like
var p = p1 || p0
in F# I'm writing
let p = if not (String.IsNullOrEmpty(p1)) then p1 else p0
is there a way to write this more succinctly?

Paul Agron

@nimzi

@kelas6666_twitter Just create your own function to wrap this or an operator

Paul Agron

@nimzi

Wondering if folks have experience with SQLProvider on NetCore.

Things work for me in VS Code but fail when I dotnet build

Trying to work against MySQL

mecusorin

@mecusorin_twitter

@forki I am stuck on the PR. Wanted to have a quick chat with you about what I am supposed to do. If I make the tests to pass (using the CI output log) by trimming the expectation text (then we lose info). I still cannot use
dotnet test FSharpSuite.Tests.fsproj
because in the build part the ngen crashes without any clue in the ngen.log file. Sergey mentioned something about fsi but need help to get started with that.

Sergey Tihon

@sergey-tihon

@mecusorin_twitter have you tried to run build.cmd in the root, then open solution in VS2019 and run test using Test runner?

mecusorin

@mecusorin_twitter

@sergey-tihon Don't have VS2019, the build is failing on ngen, no help from ngen /verbose to understand the issue. So dotnet test is out of the picture. I have VS2017 but is failing on build also.

@sergey-tihon
A) I should make the tests pass by mimicking the current compiler output? Scenario in which we want to limit future regressions having current state as a base. But we lose the intended behavior of the compiler declared in the old tests.

B) I'm doing things wrong by concatenating the Expectations from old tests. In this case how should I do?

Also the fsi thing you mentioned, can you help me get started? There is a fsx script somewhere?

Sergey Tihon

@sergey-tihon

Also the fsi thing you mentioned, can you help me get started? There is a fsx script somewhere?

This is a workaround if you cannot debug / run from VS.
You can start new instance of F# interactive, copy-paste the code snipped from your test and it will point you 1st waring/error

@mecusorin_twitter I think that A) is correct, I did check in my PRs all string from old test was an sub-strings of current error message from the compiler.
@forki confirmed that in new tests we need full error message for exact match.

mecusorin

@mecusorin_twitter

thanks

Patrik Andersson

@pandemonium

Is there a way to declare a Map field the same way: x: int list does a list<int>?

No way to prefix-apply more than one type parameter to a type constructor?

Loïc Denuzière

@Tarmil

@pandemonium yes you can do (int, string) Map for Map<int, string>

Robin Munn

@rmunn

@pandemonium Note that if you do (int, string) Map you'll get a compiler warning: "warning FS0062: This construct is for ML compatibility. The syntax '(typ,...,typ) ident' is not used in F# code. Consider using 'ident<typ,...,typ>' instead. You can disable this warning by using '--mlcompatibility' or '--nowarn:62'." So while you can do it, you probably shouldn't since (int, string) Map doesn't gain any particular readability benefits over Map<int, string> IMHO. (Whereas int list flows naturally like English, so it's more readable at a glance than list<int>).

Kor Boerema

@boeremak

Hi all, how do I add compiler directives using dotnet build that I can reference inside my program?

I have this in my docker file 'RUN dotnet build "testapp.fsproj" -c Release -o /app/build /p:DOCKER=true'

If I try #if DOCKER it does not work

I've seen the documentation for FSC and the properties but how do I get that from dotnet build?

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