1. 45 F#antastic minutes!
Getting Started with F#
Alex Casquete
acasquete

2. Alex Casquete
acasquete

3. Functional Programming
is not new
but is ignored
until now

4. The Challenges
Process large datasets
Scale to processors & computers
Easily testing
Declarative logic

5. “Take the next ticket from a list. If the
ticket is not printed, send to print. If
there are more tickets in the list, go to
the begining.”

6. “Run the first command for every
customer for which the second
command returns true.”

7. “Send to print every ticket that is not printed.”

8. “Take the next ticket from a list. If the
ticket is not printed, send to print. If
there are more tickets in the list, go to
the begining.”
“Send to print every ticket that is not printed.”

9. Thinking difɘrɘntly
Say “what” rather than “how”

10. Thinking difɘrɘntly in C#
Imperative
foreach (Ticket t in Tickets)
{
if (!t.IsPrinted)
{
Print(t);
}
}
Declarative
Tickets
.Where(t=>!t.IsPrinted).ToList()
.ForEach(t => Print(t));

11. Functional Basic Concepts
Demo: From C# to F#

12. Functional Basic Concepts
Immutability
Recursion
Higher order

13. <ironic>
10 Reasons not to use
Functional Programming
</ironic>

14. Reason 1
I don't want to follow the latest fad

15. Reason 2
I get paid by the line
I get paid by the line
I get paid by the line

16. Reason 3
{ I love me some curly braces }

17. Reason 4
string s = “I like to see explicit types”;

18. Reason 5
I like to fix vugs

19. Reason 6
I live in the debugger

20. Reason 7
I don't want to think about
every little detail

21. Reason 8
I like to check for != nulls

22. Reason 9
I like to use
design patterns everywhere

23. Reason 10
It's very freaky

24. Why use F#?
The Five C’s

25. Conciseness
Convenience
Correctness
Concurrency
Completeness

26. Understanding F#

27. F# 3.0
Data, Services,
Information
Access
F# 2.0
Transformations,
Analysis,
Algorithms,
Code, Parallel
C#, HTML5, JS
Presentation,
Publication,
Experience

28. Type providers
Demo: OData, WSDL

29. More Resources?

31. http://Fsharp.org
http://FsharpForFunAndProfit.com
http://www.fssnip.net/

32. Thanks! Questions?
Alex Casquete
acasquete