The document discusses the F# programming language. It provides an overview of F# including that it is a functional, object-oriented .NET language. It also summarizes key features of F# like strong typing, higher-order functions, pattern matching and compares syntax examples to C#. Additionally, it mentions resources for learning F# such as books, jobs listings, conferences and community sites.

1. F# Eye 4 the C# GuyPhillip Trelford@ptrelfordhttp://trelford.com/blog

3. Thoughtworks Tech RadarJuly 2011

4. Visual F#

5. The F in F# standsfor FUN

6. Halo 3 with F# Skills

7. XBLA: Path to Go – F# AI

8. F#Strongly TypedFunctionalObject OrientatedOpen Source.Net languageIn Visual Studio

9. Functional ProgrammingPure FunctionsHigher Order FunctionsPattern Matching

10. Pure Functions - Excel

11. Higher Order FunctionsF# Map/Reduceletmapf xs = seq { for x inxsdoyield f x }letreducefinititems =letmutablecurrent = initfor item in items docurrent <- f current itemcurrentC# Map/ReducepublicstaticIEnumerable<R> Map<T, R> (thisIEnumerable<T> xs,Func<T, R> f){foreach (var x in xs)yieldreturn f(x);}publicstatic RReduce<T, R> (thisIEnumerable<T> xs, R init,Func<R, T, R> f){varcurrent = init;foreach (var x in xs)current = f(current, x);return current;}

12. Pattern MatchingF#match day with| 0 ->"Sunday"| 1 ->"Monday"| 2 ->"Tuesday"| 3 ->"Wednesday"| 4 ->"Thursday"| 5 ->"Friday"| 6 ->"Saturday"| _ –>invalidArg"Invalid day"C#switch (day) { case0: return"Sunday"; case1: return"Monday"; case2: return"Tuesday"; case3: return"Wednesday"; case4: return"Thursday"; case5: return"Friday"; case6: return"Saturday"; default:thrownewArgumentException("day"); }

13. demos

14. Light SyntaxF#type Person(name:string,age:int) =/// Full namememberperson.Name = name/// Age in yearsmemberperson.Age = ageC#publicclassPerson{public Person(string name, int age) { _name = name; _age = age; }privatereadonlystring _name;privatereadonlyint _age;///<summary>/// Full name///</summary>publicstring Name {get { return _name; } }///<summary>/// Age in years///</summary>publicint Age {get { return _age; } }}

15. Unit Testing toExplorative TestingF# NUnitopenNUnit.Framework[<TestFixture>]moduleMathTest = [<Test>]let ``2 + 2 should equal 4`` () =Assert.AreEqual(2 + 2, 4)C# NUnitusingNUnit.Framework;[TestFixture]publicclassTest{ [Test]publicvoidTwoPlusTwoShouldEqualFour(){Assert.AreEqual(2 + 2, 4); }}

16. Domain Model - POStypeCode = stringtype Name = stringtype Price = decimaltype Product = Product of Code * Name * Pricetype Quantity = decimaltypeSaleLineItem = Product * Quantity

17. F# 3.0 (Beta)Type Providers

18. Units of Measure

19. Units in CellstypearithmeticOp = Add | Sub | Mul | DivtypelogicalOp = Eq| Lt | Gt | Le | Ge | Netype formula =| Negof formula| Expof formula * formula| ArithmeticOpof formula * arithmeticOp * formula| LogicalOpof formula * logicalOp * formula| NumofUnitValue| Ref ofint * int| Range ofint * int * int * int| Fun of string * formula list

20. SUMMARY

21. TIOBE Index August 2011 - F# enters Top 20

22. F# Jobs

23. Meet the F#ersTwitter #fsharp

24. F# Books

25. @jbandi#chtd Quote from "future of .net" Have a look at F# for two days and you will find yourself two years ahead of your peer .netdevs. #fsharp

26. Q & ALinkshttp://fsharp.nethttp://fssnip.nethttp://tryfsharp.orgContact@ptrelfordphil@trelford.comhttp://trelford.com/blog