The document discusses getting started with F# web development. It provides an overview of F# and compares it to C#, demonstrates F# concepts like pattern matching, and shows examples of building web applications and services with F# using frameworks like ASP.NET MVC, Web API, Service Stack, Nancy and Azure. It also discusses reactive and asynchronous programming in F# for web development.

1. Getting Started
with F# Web
Development
• Daniel Mohl
• @dmohl
• blog.danielmohl.com
• github.com/dmohl
1

2. 2 June 16, 2012
 DanielMohl
 @dmohl
 blog.danielmohl.com
 github.com/dmohl
 Getting Started with F# Web Development

3. 3 June 16, 2012

4. 4 June 16, 2012

5. 5 June 16, 2012
Daniel Mohl
F# MVP and C# Insider
danmohl@gmail.com
www.twitter.com/dmohl
blog.danielmohl.com

6. 6 June 16, 2012
What Are We Doing?
 Why F#?
 F# Primer/Review
 F#/C# ASP.NET MVC 4 Example
 ASP.NET Web API, Service Stack, Nancy,
Frank
 Windows Azure
 WebSharper Example

7. 7 June 16, 2012
Why Functional? Why F#?
 Simple Code to Solve Complex Problems
 Terse Yet Readable
 Less Errors
 The Move to Multi-core (immutable by default)
 Programming in the Small (Single Responsibility
Principle)
 Higher Level Language Provides Optimization
Opportunities
 Code That is Correct More Often
 Features Not In Other Mainstream Languages
 Staying Ahead of the Competition
 Why Functional Programming Matters
 F# in the Enterprise

8. 8 June 16, 2012
Why F# for Web Dev?
 Asynchronous Workflows and Reactive
Programming
 F#/JavaScript Commonalities
 Easier to support next generation web
development
 HTML5 (Web Sockets, Canvas)
 Asynchronous and Reactive Programming
Web Socket Example
Canvas Example
Twitter Feed Sample (Reactive Programming)

9. 9 June 16, 2012
F# Primer/Review
 Whitespace Matters
 The let Keyword
 Pattern Matching
 More During the Demos

10. 10 June 16, 2012
Whitespace Matters
//F# //C#
open System using System;
let doSomething val =
namespace ConsoleApplication1
val + val
{
Console.WriteLine class Program
(doSomething 1) {
static int doSomething(int val)
{
return val + val;
}
static void Main(string[] args)
{
Console.WriteLine(
doSomething(1));
}
}
}

11. 11 June 16, 2012
The let Keyword
//F# //C#
open System using System;
let val2 = 1
namespace ConsoleApplication1
let doSomething val =
{
val + val2 class Program
Console.WriteLine {
(doSomething 1) static int val2 = 1;
static int doSomething(int val)
{
return val + val2;
}
static void Main(string[] args)
{
Console.WriteLine(
doSomething(1));
}
}

12. 12 June 16, 2012
Pattern Matching
Kind of like a switch/case statement, but so
much more!
Example 1:
let boolVal = true
match boolVal with
| true -> printf “was true”
| _ -> printf “was not true”
Example 2:
let name = "Dan", "Mohl"
match name with
| _, "Smith" -> printf "Found a Smith"
| "Don", _ -> printf "Found a Don"
| "Dan", "Mohl" -> printf "Found Dan Mohl"
| _ -> printf "Name not found"

13. 13 June 16, 2012
A Few General Examples
 Sample F# Script (Simple Strategy Pattern
Example)
 Fetch Museum List (Async Example)
 Twitter Feed (Reactive Programming
Example)
 Interactive DirectX

14. 14 June 16, 2012
F#/C# ASP.NET MVC 4
Example
http://visualstudiogallery.msdn.microsoft.co
m/3d2bf938-fc9e-403c-90b3-8de27dc23095

15. 15 June 16, 2012
F#/C# ASP.NET Web API
http://visualstudiogallery.msdn.microsoft.co
m/3d2bf938-fc9e-403c-90b3-8de27dc23095

16. 16 June 16, 2012
Sidebar
Windows 9?

17. 17 June 16, 2012
Windows 8

18. 18 June 16, 2012
Windows 9?

19. 19 June 16, 2012
Other Web Frameworks
- Service Stack
- Nancy
- Frank

20. 20 June 16, 2012
F# and Azure
- Fog - https://github.com/dmohl/Fog

21. 21 June 16, 2012
WebSharper Example
http://visualstudiogallery.msdn.microsoft.co
m/en-us/288b94ea-0ea7-4dde-8906-
f72eb22fbe1b
Check out http://fpish.net for an example
of a live site built with WebSharper.

22. 22 June 16, 2012
More Information
 Books - http://msdn.microsoft.com/en-
us/fsharp/gg262865.aspx
 F# MSDN - http://msdn.microsoft.com/en-
us/fsharp/gg262865.aspx
 Blogs
 Twitter
 Ask – F# has the greatest community around

23. 23 June 16, 2012
Daniel Mohl
F# MVP and C# Insider
danmohl@gmail.com
www.twitter.com/dmohl
blog.danielmohl.com