OO, streams and reactive computations along the way F# and Java are clearly quite different languages and belong to separate language families, but a comparison could still be fun. I have been working with Java lately, so why not compare C# and Java instead? …

Magic type inference of ML languages How does type inference work in ML languages like standard-ML, OCAML, F#, Elm, Reason and even Haskell? Let’s call it Magic. How does this kind of magic work? We are going to take a look at the case of F# but once you learn…

A small contrib to F# interactive This article is a bit of a post scriptum. Last year I wanted to add to fsharp interactive console (dotnet fsi) this directive #clear;; What it does? Nothing fancy but can still be useful.. System.Console.Clear() Unfortunately I had some troubles running and fixing the…

Turning legacy js into modern ts and back Babel is our Flux Capacitor! This month we were able to achieve some 😻 happy transformation* in our FE services, which are basically aspnetcore apps serving static content in the wwwroot folder, and relying on some obsolete js framework (durandaljs) for view, routing and navigation. We…

A little trick to only show test summary with PS core (or grep) If you also struggled with extra long verbose logs in dotnet test command, here is a little trick to just show failed or passed tests using a simple powershell command. dotnet tool install --global PowerShell Note: yes, powershell runs multi-platform so e.g. i am running this on a macos (would work also on other nix machines). dotnet test | select-string -Pattern "(Passed|Failed)!"

Understanding application dependencies in a single script file Setup (skip if you are ready) brew install --cask dotnet-sdk //mac winget install -e --id Microsoft.dotnet //win test your setup with dotnet fsi > "hello";; //always append commands with ;; else is multiline #quit;; //interactive commands have a trailing # symbol install vscode and ionide extension (or if…

Fable-Py We are going to compile F# to Python! Seriously Let’s get started, create an empty folder and an empty F# script file (app.fsx), as usual you need dotnet-sdk installed and vscode + ionide (or rider or visual studio). mkdir test-fable-py cd test-fable-py touch app.fsx code . Install Fable-Python dotnet new tool-manifest…

redis 101 in a No-line F# script Redis is a popular (the most popular?) key-value store db, with support for pubsub, streaming, and a ton of other features via its extensible modules. And the stack-exchange client is the de-facto battle-tested and future proof dotnet redis driver for your app. Here…

a series about learning aspnetcore using F# interactive Installing dotnet-sdk 🍰 brew install dotnet // mac winget install -e --id Microsoft.dotnet //win To follow along you need a working dotnet environment, so either from command line and vscode, or using the full fledged IDEs Visual Studio or Rider. If you use VsCode already…