September 2015 – Sergey Tihon's Blog

F# Weekly #39, 2015

27/09/2015F# Weekly2 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

Preview of Visual F# Update 1 + fixed Express Sku support
Progressive F# Tutorials 2015
TheGamma
An F# type provider for SAS is just happening here. FsLab + SAS is coming soon.
The source browser engine behind referencesource.microsoft.com and source.roslyn.io is now open-source

Videos/Presentations

Jet.com scales with Azure, F#, and more with Rachel Reese – Scott Hanselman
TheGamma: Programming tools for data journalism – Tomas Petricek
F# for Scala developers – Alfonso Garcia-Caro
Some cool stuff I liked in F# while building a pet project in my spare time – Koen Metsu
F# in the Real World – Yan Cui
How machine learning helps cancer research – Evelina Gabasova
CppCon 2015: Bjarne Stroustrup “Writing Good C++14”

Blogs

Open Sourcing Surge – Alex Hardwicke
Exercises in Programming Style–Cookbook – Yan Cui
Sequential Logic Emulation with F# – Steven Pemberton
Mobile Apps w/ F# – Jeremy Abbott
Automating Xamarin Builds With FAKE – Part 1: Introduction And Setup – Jonathan Wood
Web with F#: From Scripts to Azure with Tomas Petricek
F# Friday – The Seq.skipWhile Function – Brad Collins

F# vNext News

Visual Studio F# 4.0 Update 1 Preview 09-23-2015
Don Syme is enabling F# type providers to more easily target portable profiles.
Recently proposed ideas:
- Allow “as” in match head

New releases

WebSharper 3.4.19

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

Previous F# Weekly edition – #38

F# Weekly #38, 2015

20/09/201520/09/2015F# Weekly2 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

Ionide – a suite of packages built on top of the Atom editor that allow cross platform F# development. (upcoming FsReveal integration)
Microsoft Research is working on an open-source distributed analytics platform, codenamed Prajna, that is similar to Apache Spark, and meant for building distributed cloud services.
Paket 2.0 + compatible VisualStudio and Atom addins (dependency groups were introduced)
Please help to improve the Xamarin F# experience by answering this quick survey.
edX F# course starts on Sept 28
Some reasons to consider HOPAC.
New Visual F# PowerTools small feature: go to referenced files from #load inside fsx scripts.
NuGet packages from .NET world.

Videos/Presentations

Little Introduction To Functional Programming & WCF Example in F# – Enrico Benini
Microsoft Data Science Technologies: Architecture Edition – Mark Tabladillo
Powering the Internet of Things – Roger Lipscombe
Brave New OCaml World – Marek Kubica

Blogs

Strengthening the building blocks of the digital world through research-industry collaboration – Don Syme
Creating web sites with Suave: How to contribute to F# Snippets – Tomas Petricek
Interview with Adam Granicz on WebSharper 3 – Pierre-Luc Maheu
Drone Builder – A Story of Drones, React, and F# – Frank A. Krueger
An Actor model example with Akka.NET – Claus Sørensen
Functional error handling – parsing command line arguments in F# – Leif Battermann
Exercises in Programming Style–Monolith – Yan Cui
Try WebSharper: on-hover type info – István Gansperger
F# Friday – The Seq.skip Function – Brad Collins
Cross-platform C# and F# in 2015 – Tim Jones

F# vNext News

New releases

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

Previous F# Weekly edition – #37

F# Weekly #37, 2015

14/09/2015F# Weekly4 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

F#’s ability to make Life Easier For Programmers is key to its popularity within industry.
F* (FStar) reworked and released as v0.9.0.
Community developed F# client for Event Store is listed on the site.
Contribute to the new version of fssnip! It is now deployed to Azure: fssnip.azurewebsites.net. Just a few issues to go!
MSBuild is going cross-platform with .NET Core!
John Harrison’s “Handbook of Practical Logic and Automated Reasoning”, ported to F#
F#unctional Londoners meetup just tipped over 1000 members!
All OWIN features is implemented in Suave.IO now.
F# Gotham – 17 Oct 2015
.NET DeveloperDays – 19-20 October 2015
Build Stuff 2015 Ukraine – 23-24 November 2015

Videos/Presentations

F# Type Providers: The Current State – Sergey Tihon
Tour of language landscape (katsconf) – Yan Cui

Blogs

Improving the link between research and industry in the programming world – Don Syme
In the age of the web: Typed functional-first programming revisited – Tomas Petricek
FAKE + Paket with an interview from the creator – Mark Gray
Word search puzzle in F# – Eric Lubisse
EjectABed Version 2 – Now Using the Raspberry Pi (Part 1) – Jamie Dixon
Know When to Fold’em – Adam Krieger
Canopy : Automate your browser tests the F# way! – Richard Kerslake
Exercises in Programming Style–Go Forth – Yan Cui
F# Friday – The Seq.takeWhile Function – Brad Collins
Series: Functional error handling in F# and C# – Leif Battermann
Turnpike Problem (F#) – Boris Kogan
Usando o “Project Euler” para aprender F# – Problemas 6, 7, 8, 9 e 10 – Elemar DEV

F# vNext News

New releases

WebSharper UI.Next 3.4.19

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

Previous F# Weekly edition – #34#35#36

F# Weekly #34,#35,#36, 2015

06/09/201506/09/2015F# Weekly3 Comments

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

List of F# community heroes for 2015
Jet. Realtime Pricing, Realtime Advertising
New MOOC: Programming in F#.
F# Gotham is coming…
Visual F# PowerTools now support lightweight interface implementation
Argu – a declarative CLI argument/XML configuration parser for F# applications
Suave.IO‏ : Hello World OWIN & Hello World, Nancy!
FsLab Visual Studio template now supports VS 2015.
“Machine Learning Projects for .NET Developers” is finally available on Amazon
Paket 2.0 will introduce “Groups” and “Analyzers“
Announcing Availability of ASP.NET 5 Beta7
Mono 4.2.0 is released

Videos/Presentations

Suave from Scratch with Henrik Feldt
Fake+Paket With Steffen Forkmann
10 Ways of Getting Started with F# – Tomas Petricek
5th Anniversary – Manipulating Data Trees in Fungible with Rick Minerich
Fsharp – Kolja Dummann
Обзор F# 4.0 – Дмитрий Власов (slides)
Introdução ao F# – Fabiano Arruda
FSharp On The Desktop – Birmingham FP 2015 – Phillip Trelford
Datatype Generic Programming in F# – Ernesto Rodriguez ,Wouter Swierstra

Blogs

Recursive types, catamorphisms and folds – Scott Wlaschin
Real-time analytics with Apache Storm – now in F# – Eugene Tolmachev
F# – Flexera FNOC WCF with Basic Auth – Ramón Soto Mathiesen
F# Card Game Part 2 – Dealing Cards – Reid Evans
Error: Successive arguments should be separated by spaces or tupled – Reid Evans
YC.PrettyPrinter vs Microsoft.Text.StructuredFormat
When x, y, and z are great variable names – Mark Seemann
Try WebSharper: snippet versioning, gist import, and other enhancements now available – Adam Granicz
Computation expression approach for calling REST API – Kimserey Lam
New tools allow Microsoft’s functional language to work better with Visual Studio – Paul Krill
F# Friday – The List.append Function – Brad Collins
_____101 |> F# Coding Ecosystem: Paket && Atom w/ Paket – Λdrøn
Wake County Voter Analysis Using FSharp, AzureML, and R – Jamie Dixon
Single page application in F# with WebSharper UI.Next – Kimserey Lam
F# Light Changes and Features – Heather
Hackatron Prime – Mark Gray
FSharpArm – part 2 – Frank Joppe
Code Reuse with the SqlProgrammabilityProvider – Reid Evans
F# Friday – The Seq.take and Seq.truncate Functions – Brad Collins
Canopy : Automate your browser tests the F# way! – Antoine Sauvinet
Facebook Api Using F# – Jamie Dixon
Live F# coding and snippets with dependencies in Try WebSharper – Adam Granicz
F# – Monty Hall problem – Yan Cui
Best game programming books – Laurent Lepinay
Exercises in Programming Style–Style 1 – Yan Cui
Where did the Functional Languages come from? – FunctionalWorks
“Getting” Functional Programming – Steve Gilham
Decomposition Problem with F#, Dynamic Programming – Boris
Stateless services on Azure Service Fabric in F# – Isaac Abraham
Wake County Voter Analysis Using FSharp, AzureML, and R – Jamie Dixon
Swagger for F# Web Apps – Sergey Tihon
Important Languages You’ve Never Heard Of – Jeff Cogswell
Random Art – Phillip Trelford

F# vNext News

New releases

fszmq 12.1.1
FAKE v4.3.6 (“soft dependencies”, TFS and VisualStudioOnline support, FluentMigrator)
F# Azure Storage Type Provider 1.3.0
SourceLink.Fake 1.1.0
Logary 3.4.1
WebSharper 3.4.14
FSharp.RDF 1.1.4
FSharp.Qualia 0.1.4
CoreTweet.FSharp 0.5.3
F# mode for Emacs 20150902.732
atom-fsharp 0.13.0

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

Previous F# Weekly edition – #33

Swagger for F# Web Apps

06/09/201506/09/2015F#15 Comments

Swagger is a simple yet powerful representation of your RESTful API. With the largest ecosystem of API tooling on the planet, thousands of developers are supporting Swagger in almost every modern programming language and deployment environment. With a Swagger-enabled API, you get interactive documentation, client SDK generation and discoverability.

Swagger is very powerful framework that is able to generate schema and rich UI for your RESTful API. As I know, Swagger is very popular framework especially in the non-.NET world. You probably have already seen Swagger UI (like this) at several resources.

It turns out that it is not hard to use Swagger for .NET F# apps. There is a project called Swashbuckle, which adds Swagger to WebApi projects.

First of all, you need to create F# ASP.NET Web API project. You can do it using “F# Web Application templates (MVC 5 and Web API 2.2) by Ryan Riley and Daniel Mohl“. Choose “Web API 2.2 and Katana 3.0” option in project creation wizard.

So, now you have F# Web App with RESTful API: CarsController with two services ‘/api/cars‘ and ‘/api/car/{id}‘. Everything is awesome but we do not have UI that is able to show a list of available services, their parameters and return types. Swashbuckle will help us here, we need to install ‘Swashbuckle.Core‘ package to our web app.

Install-Package Swashbuckle.Core

The last step is to update HttpConfiguration in Startup.fs in proper way to register Swagger. Add following three lines to the end of RegisterWebApi method.

open Swashbuckle.Application

type Startup() =
    static member RegisterWebApi(config: HttpConfiguration) =
        // ...
        // Swagger configuration
        config
          .EnableSwagger(fun c -> c.SingleApiVersion("v1", "My API") |> ignore)
          .EnableSwaggerUi();

That’s all! When you start your web application and open ‘/swagger/ui/index‘ URI you will see beautiful documentation for your RESTful API.