F# Weekly #9, 2019 – VS 2019 RC, F# JSON TP for Fable & SwaggerProvider for .NET Core

Welcome to F# Weekly,

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A roundup of F# content from this past week:

News

• What’s new in Visual Studio 2019 RC for F#
• Visual Studio 2019 Release Candidate (RC) now available
• An update to C# versions and C# tooling
• How to port desktop applications to .NET Core 3.0
• What’s New for Xamarin Developers in Visual Studio 2019 Preview 2

Videos

• Don Syme – Keynote – F# Code I Love | Lambda Days 2019
• John Azariah – Empowering the Quantum revolution with Q# | Lambda Days 19
• Hot-reload your UI with F# – Chet Husk

Blogs

• What is a robot? – giuliohome
• JIRA work log API with F# and Azure Functions – Karl Solgård
• Panzer General Domain-Driven Design – Jamie Dixon
• Reactive Marble Testing with Functional Combinators in F# – Stijn Moreels
• K-means Using F# – Gaston Verelst
• .NET Inside Out Part 3 — How to override sealed function in C# – afish
• Is C# a low-level language? – Matt Warren

F# vNext:

• Enable SourceLink for FSharp.Core.pdb
• [WIP, FS-1043] Extension members visible to trait constraints
• F# RFC FS-1067 – Async.Sequential
• Recent language suggestions:
  • Allow undentation for constructors
  • Copy and Update Record Lambdas
  • Allow access to record type constructors in F#
  • Add compiler-known attribute for enforced tail recursion
  • Add a safe stackalloc function that returns a Span
  • Better ToString implementation for Result
  • Underscores in numeric literals after prefix and before suffix
  • Record-like member constraints
  • Option should implement Seq
  • Multiple pattern cases with ‘when’ clauses
  • Allow for pattern matching on anonymous records in a limited context
  • Allow IsByRefLike and IsReadOnly anonymous records

Open source projects

• Microsoft/jupyter-core – Library for writing Jupyter kernels in .NET Core
• PragmaticFlow/NBomber – Very simple load testing framework for Pull and Push scenarios.
• fable-compiler/Fable.JsonProvider – F# JSON Type Provider for Fable
• crowded/ply – High performance (Value)Task computation expressions for F#
• einarwh/escher-workshop – Workshop: Functional geometry with Escher and Elm.

New Releases

• FSharp.Compiler.Service 27.0.1
• WebSharper 4.5.9 (with F# anonymous record support)
• FCSWatch 0.5.0
• Fable.MaterialUI 3.1
• SwaggerProvider 0.10.0-beta05

That’s all for now. Have a great week.

Previous F# Weekly edition – #8, 2019