f#

来源： https://stackoverflow.com/questions/29077352/f-difference-between-dictionary-hashtable-and-map

来源： https://stackoverflow.com/questions/29077352/f-difference-between-dictionary-hashtable-and-map

问题 I'm learning F# and I'm just trying to build Animate a pendulum program. Here's the code: https://rosettacode.org/wiki/Animate_a_pendulum#F.23 As far as I understand, VS 2019 doesn't support WinForms in F# (maybe, I'm wrong), so I have error messages, trying to copy/paste that code: What should I do? Thanks a lot ! 回答1: If you're looking to use Winforms on .NET core, you'll need to do the following in your project: Open the project file (double-click on the node in Visual Studio) Change the

问题 Using .NET Core 3 preview 4, the "API" template for a F# ASP.NET MVC project fails to build. This is without any changes to the template whatsoever. This is the code that fails: type Startup private () = member this.ConfigureServices(services: IServiceCollection) = // Add framework services. services.AddControllers().AddNewtonsoftJson() |> ignore With error ...\Startup.fs(23,35): error FS0039: The field, constructor or member 'AddNewtonsoftJson' is not defined. Maybe you want one of the

问题 I'm working with the SAFE stack (https://safe-stack.github.io/) and through the example dojo. It's great so far. I'd like to extend the example to include a button to login/auth via Google. So I looked at an example on the Google website (https://developers.google.com/identity/sign-in/web/build-button). And then I had a look how to do authentication using ASP.NET (https://docs.microsoft.com/en-us/aspnet/core/security/authentication/social/google-logins?view=aspnetcore-2.1&tabs=aspnetcore2x)

问题 I'm working with the SAFE stack (https://safe-stack.github.io/) and through the example dojo. It's great so far. I'd like to extend the example to include a button to login/auth via Google. So I looked at an example on the Google website (https://developers.google.com/identity/sign-in/web/build-button). And then I had a look how to do authentication using ASP.NET (https://docs.microsoft.com/en-us/aspnet/core/security/authentication/social/google-logins?view=aspnetcore-2.1&tabs=aspnetcore2x)

问题 According to this answer, F# supports OCaml style type parameters. The example in the question is: type 'a NestedList = List of 'a NestedList list | Elem of 'a However, I could not find this syntax documented anywhere in the F# documentation and moreover, I cannot get the F# compiler accept the syntax in the answer I gave the link to. This attempt to use multiple parameters are not accepted by the compiler: type ('a * 'b) SomeType = ('a * 'b) This however, works: type ('a , 'b) SomeType = ('a

问题 And more specifically, in FSI ? 回答1: You can programatically control the clipboard using the Clipboard class in the System.Windows.Forms namespace. (The required assembly is brought in by default to FSI.) open System.Windows.Forms Clipboard.SetText("Hello from FSI!") 来源： https://stackoverflow.com/questions/1791747/how-to-copy-to-the-clipboard-in-f

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Closed 6 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. I've searched on the Internet for comparisons between F# and Haskell but haven't found anything really definitive. What are the primary differences and why would I want to choose one over the other? 回答1: Haskell

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Closed 6 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. I've searched on the Internet for comparisons between F# and Haskell but haven't found anything really definitive. What are the primary differences and why would I want to choose one over the other? 回答1: Haskell