Krzysztof Cieślak

Current sessions

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Reinventing MVC pattern for web programming with F#

The MVC pattern has been one of the most important architectural patterns for server-side web development - it has been implemented and popularized by frameworks like Ruby On Rail or ASP.NET MVC. However, this pattern was traditionally coupled with object-oriented programming. In the talk, I will show how to reinvent MVC pattern, and structure your web application in a functional language - F#.

The talk will cover some brief introduction to F# - modern functional programming language running on .Net platform, show how to model MVC layers using functional composition, and at the end show some examples of applying MVC pattern with Saturn - opinionated, web development framework for F# which implements the server-side, functional MVC pattern

Challenges of post-OSS world.

OSS has won. After years of convincing people to use open source software, fighting with false dichotomy between OSS and industrial, commercial software, and defending against negative biases, position of OSS is no longer disputed – it's been used by the vast majority of companies around the world, it has become default choice when choosing technologies, it powers the internet, our PCs, mobile phones and most devices we use every day, it's been accepted by huge, conservative companies that were against the whole concept a few years ago.

But were we ready for that? Have we built enough foundations for this new world, or are we just building the castle on the sand and another disaster like Heartblead is going to happen? Are assumptions on which we’ve built our mental model about OSS still correct in 2018? And what's the future of the OSS ecosystem?

LSP - magic behind your IDE

Language Server Protocol (LSP) is a project that has changed how editor tooling is built over the past two years. It is a specification of the communication between a client (editor) and a server that provides language tooling capabilities such as autocomplete, tooltips, etc. It reduces the m-times-n problem to the m-plus-n problem —similar to how Virtual Machines solve the same problem for deploying code to many platforms.

In the talk, I'll give general overview of the protocol, show some of its capabilities and explain why it is so important. I'll also dive into some sample implementations, showing you how you can leverage LSP to create rich editing experience for many different editors.

Behind F# editor tooling

F# editor tooling is in a unique position among FP languages - cross-platform, feature-rich, stable, innovative and supported and actively developed by both OSS community and commercial vendors. It's also ubiquitous - powered by the compiler which is developed with tooling in mind.

By the end of the talk, you should have an idea of how to design pieces of a compiler so that accurate tooling can be built, how constraints of a language affect tooling, and some of the challenges tooling developers face.

F# Full Stack with SAFE

F# excels at building efficient, scalable and robust web solutions. Web programming is based around receiving a single HTTP request and replying with a result, which maps very well to a stateless, functional approach. Advantages to using F# for web programming include using high level, declarative, composable code, interop with rich .Net ecosystem, and using battle-tested solutions like Kestrel and ASP.NET Core. The introduction of the [SAFE stack](https://safe-stack.github.io/) presents significant productivity gains for .NET developers to build full stack web applications in F# which run on both the server and in the user’s web browser, whilst taking advantage of F#'s functional-first feature set and capabilities, including reduce bug rates and quicker time to market.

In this talk you'll learn how to write end-to-end applications that run on the server (across Mac, Windows or Linux) and browser using F# for the entire system and effectively use the SAFE stack toolchain including .Net CLI, Fable, and Saturn tooling.

Let's code together - bringing F# to JS world.

Javascript has conquered the software development world - developers can use it in the browser, on the server, to write mobile apps, on the desktop with Electron, and even to create serverless services. Whether you like the language or not, the truth is JS developers have built an incredible ecosystem with libraries and tools to do almost anything.

During the talk, I'll show how to bring the power of F# - robust, static type system with type inference, pattern matching, and immutable design, and succinct syntax - to this vast and rich JS world using Fable - F# to JS compiler.

It will be a practical talk, showing various use cases of Fable - from building React-based web applications, through building serverless, edge web services using Cloudflare Workers, creating mobile apps, to building VSCode extensions.

Past and future events

.NET Conf: Focus on F# A Tour of F# Editor Tooling	29 Jul 2021
Lambda Days 2020 Behind F# editor tooling	13 Feb 2020 - 14 Feb 2020 Kraków, Lesser Poland, Poland
Scale By The Bay 2019 Hacking F# in JS ecosystem	13 Nov 2019 - 15 Nov 2019 San Francisco, California, United States
BRISTECH 2019 LSP: the magic behind your IDE	7 Nov 2019 Bristol, England, United Kingdom
Workshop - SAFE Stack (focused on Fable & Elmish)	21 Oct 2019 - 25 Oct 2019 Zürich, Zurich, Switzerland
F# Zurich User Group Reinventing MVC pattern for web programming with F#	24 Oct 2019 Zürich, Zurich, Switzerland
Open F# 2019 Keynote - Ionide. The OSS Story SAFE Stack Dojo	25 Sep 2019 - 27 Sep 2019 San Francisco, California, United States
Fable Conf 2019 Building F# Tooling	6 Sep 2019 - 7 Sep 2019 Antwerpen, Flanders, Belgium
Prage F# User Group State of the union	9 Apr 2019 Prague, Hlavní město Praha, Czechia
F# eXchange 2019 Reinventing MVC pattern for Web Programming with F#	4 Apr 2019 - 5 Apr 2019 London, England, United Kingdom
FOSDEM 2019 Hacking F# in JS ecosystem Reinventing MVC pattern for web programming with F# Panel: OSS and .Net	2 Feb 2019 - 3 Feb 2019 Brussels, Brussels Capital, Belgium
Workshop - F# development with SAFE Stack Workshop - F# development with SAFE Stack	7 Nov 2018 Vienna, Austria
FableConf 2018 + RemmidemmiConf 2018 Keynote - Future of F# web development	26 Oct 2018 - 27 Oct 2018 Berlin, Germany
Open F# 2018 Web Programming with F# and SAFE Stack (workshop) Reinventing MVC pattern for web programming with F# Challenges of post-OSS world.	27 Sep 2018 - 28 Sep 2018 San Francisco, California, United States
OSCon Portland 2018 Getting started with Fable - F# to JS compiler	16 Jul 2018 - 19 Jul 2018 Portland, Oregon, United States
NDC Oslo 2018	13 Jun 2018 - 15 Jun 2018
New Crafts Paris 2018 Challenges of post-OSS world	17 May 2018 - 18 May 2018 Paris, Île-de-France, France
flatMap(Oslo) 2018 Getting started with Fable - F# to JS compiler (workshop)	2 May 2018 - 3 May 2018 Oslo, Norway
NYC F# User Group Reinventing MVC pattern for web programming with F#	25 Apr 2018 New York City, New York, United States
Talk for Jet.com Challenges of post-OSS world.	24 Apr 2018 Hoboken, New Jersey, United States
The Hanselminutes podcast F# and the functional SAFE Stack with Krzysztof Cieślak	23 Mar 2018
Workshop - Introduction to F#	22 Jan 2018 - 24 Jan 2018 Kaunas, Lithuania
CodeMotion Milan 2017 Hacking F# in JS ecosystem	10 Nov 2017 - 11 Nov 2017 Milan, Lombardy, Italy
Remmidemmi Conf 2017 Path to happiness with OSS	4 Nov 2017 Berlin, Germany
FableConf 2017 Building editor tooling with Fable Write your own VS Code extension - workshop	22 Sep 2017 - 23 Sep 2017 Bordeaux, Nouvelle-Aquitaine, France
New Crafts Paris 2017 Hacking F# in JS ecosystem	17 May 2017 - 19 May 2017 Paris, Île-de-France, France
Get.Net Lodz 2017 Hacking F# in JS ecosystem	22 Apr 2017 Łódź, Łódź Voivodeship, Poland
F# eXchange 2017 What's new in F# xplat tooling in 2017?	6 Apr 2017 - 7 Apr 2017 London, England, United Kingdom
.Net Fringe 2016 Getting productive with F# Open Source tooling	10 Jul 2016 - 12 Jul 2016 Portland, Oregon, United States
F# Technology Creators Workshop Ionide - new features	13 May 2016 - 14 May 2016 Cambridge, England, United Kingdom
F# eXchange 2016 Forge - F# CLI tooling	15 Apr 2016 London, England, United Kingdom
NDC London 2016 Ionide and state of F# open source environment	11 Jan 2016 London, England, United Kingdom

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