The slogan

Write once, run anywhere

• Sun Microsystems
• Java cross-platform benefits
• Copied to make my talk more catchy

https://en.wikipedia.org/wiki/Write_once,_run_anywhere

History

• F# evolution
• influential platforms / tools
• possibly not in chronological order

https://fsharp.org/history/

FAKE - F# Make

Desktop

• .NET Core
• .NET SDK
  • templates
  • watch mode

NET Core 3.0 Supported OS

• Windows Client | 7 SP1+, 8.1 | x64, x86
• Windows 10 Client | Version 1607+ | x64, x86
• Windows Server | 2008 R2 SP1+ | x64, x86
• Mac OS X | 10.12+ | x64
• Red Hat Enterprise Linux | 6 | x64
• Fedora | 28 | x64
• Debian | 9 | x64, ARM32, ARM64
• Ubuntu | 16.04+ | x64, ARM32, ARM64
• Linux Mint | 18 | x64
• openSUSE | 42.3+ | x64
• SUSE Enterprise Linux (SLES) | 12 SP2+ | x64
• Alpine Linux | 3.8+ | x64, ARM64

Desktop Demo

• 3 Operating systems:
  • OSX (local MacBook)
  • Windows (Virtualbox, Vagrant)
  • Ubuntu (Virtualbox, Vagrant)
• Create console app using .NET SDK
• Print OS information
• Run the app on all OS
• Run "watch" mode

https://www.vagrantup.com/

Desktop Demo recap

• Cross-platform .NET SDK
• Easy to set up
• Caution: "watch" + multi OS doesn't work with Paket
• What about GUI?

Web

• Frameworks
  • Fable
  • WebSharper
• Output
  • JavaScript
  • HTML
  • CSS

Web Demo

• Fable + Elmish + React template
• Hot Module Replacement
• https://fable.io/repl/
• Fable - React Server Side
• Giraffe view engine - F# to HTML
• Fable Material UI - F# to CSS
• F# Type provider for CSS

Web Demo recap

• Seamless integration with JS ecosystem
• Ability to output also HTML/CSS from F#
• Not only Web - Node.js

Desktop GUI

• Electron https://electronjs.org/
  • uses Node.js and Chromium
  • F# -> Fable -> JS -> Electron
• Fabulous
  • WPF
  • GTK
  • Mac

Desktop GUI Demo

• 3 Operating systems:
  • OSX (local MacBook)
  • Windows (Virtualbox, Vagrant)
  • Ubuntu (Virtualbox, Vagrant)
• Create app from fable-electron template
• Print OS information
• Run the app on all OS

Desktop GUI Demo Recap

• Cross-platform ElectronJS
• Easy to set up
• Other options available

Mobile

• Frameworks
  • Xamarin + Fabulous
  • React Native (again via Fable)
• Targets
  • Android
  • iOS

Mobile Demo

• iOS and Android
• Fabulous dotnet template

Mobile talks

• Jim Bennett - Build Cross-Platform Mobile Apps Using Fabulous
• Kunjan Dalal - From Concept to Creation in a Week with Fabulous

IoT

• .NET Core to ARM architecture
  • linux-arm
  • win-arm

https://twitter.com/sforkmann/status/1049722323262160898

Docker

https://hub.docker.com/_/microsoft-dotnet-core

• >10M pulls from Docker Hub
• Featured Repos:
  • .NET Core SDK
  • ASP.NET Core Runtime
  • .NET Core Runtime
  • .NET Core Runtime Dependencies
  • .NET Core Samples

Docker

--deploy docker option for SAFE Template

Other platforms & tools

Tests

• https://github.com/fsprojects/FsUnit
• https://github.com/haf/expecto
• https://github.com/fscheck/FsCheck
• https://github.com/SwensenSoftware/unquote
• https://github.com/lefthandedgoat/canopy

Fake

--> https://fake.build/

Jupyter Notebooks

https://github.com/fsprojects/IfSharp

Fez

https://github.com/kjnilsson/fez

--> FEZ - fsharp type safety for the BEAM (F# eXchange '18)

Pulumi

--> Lightning Talk: Cloud Infrastructure as F#

More?

Mixing platforms

SAFE - Web

• Web server: F# -> .NET Core
• Web client: F# -> JavaScript
• Shared F# code:
  • Remote call protocols
  • Server-side & client-side validation
  • etc...
• https://safe-stack.github.io/docs/
• https://github.com/SAFE-Stack/SAFE-BookStore

SAFE - Mobile

• REST API: F# -> .NET Core
• Mobile apps: F# -> JS -> React Native -> iOS + Android
• Shared F# code:
  • Business logic
  • Mobile device OS classification
  • etc...
• https://github.com/SAFE-Stack/SAFE-Nightwatch

SAFE - IoT

• Web server: F# -> .NET Core
• Web client: F# -> JavaScript
• Raspberry PI: F# -> .NET Core (linux-arm RID)
• Shared F# code:
  • Determining firmware
  • Communication protocol
  • etc...
• https://github.com/forki/audio

SAFE - Desktop

• Remote Desktop in a browser (alpha version)
• Device Agent:
  • F# -> .NET Core and .NET 4.0
  • Windows, OSX and Linux
• Browser viewer: F# -> JS
• Shared F# code:
  • HTTP & WebSocket payload DTOs
  • JSON serialisation (Thoth.Json)
  • Protocol for Web Remote Desktop (Apache Guacamole)

SAFE - All inclusive?

• Desktop
• Mobile
• Web
• IoT
• Docker
• Serverless
• Other?

SAFE Talks

• Anthony Brown - Workshop: Up and Running with the SAFE Stack
• Tomasz Heimowski - F# SAFE Stack: Current State