![Demo.... Source available @ github: https://github.com/ramik/Demo/blob/master/FunctionalTutorial/CSharpExamples/PresisDemo/SlideDemo.fsAnd if you don’t have internet access, snapshotted source just for youmodule SlideDemoopen System;type PresentationKeeper(name: string, employer : string) = member lollis.name = name member fuulis.employer = employer override this.ToString() = name + ", " + employerlet Rami = PresentationKeeper("Rami Karjalainen", "Reaktor")let Tuomas = PresentationKeeper("Tuomas Hietanen", "Basware")let topics = [ (2, "Functional programming from c# perspective, Linq principles", Tuomas); (1, "Functional programming in general", Rami); (3, "F# examples: ’basic’ stuff", Rami); (4, "F# and C# interoperability", Rami); (5, "F# vs. C#", Tuomas) ]let formatTopic topic keeper = String.Format ("{0} ({1})", topic, keeper.ToString())let pimpTheList = topics |> Seq.sortBy (fun (prio,_,_) -> prio) |> Seq.map (fun (_, a, b) -> a,b) |> Seq.map (fun x -> (formatTopic (fst x) (snd x)))let printPimped x = x |> Seq.iter (fun c -> printfn "%s" c)](https://image.slidesharecdn.com/fsharppresisshare-110620163349-phpapp02/85/F-and-functional-programming-7-320.jpg)
F# and functional programming
- 1. Functional programming and F#Sanko.net meeting 8.6.2011
- 2. AgendaFunctional programming from c# perspective, Linq principlesFunctional programming in generalF# and C# interoperabilityF# examples: ’basic’ stuffF# vs. C#
- 3. AgendaFunctional programming from c# perspective, Linq principlesFunctional programming in generalF# and C# interoperabilityF# examples: ’basic’ stuffF# vs. C# Eh?There’s a bug in the Agenda!!!Wrong order and names missing!
- 4. This happens, when you Powerpoint without test harness! Lets kick the PowerPoint and.... Correct the agenda using....
- 5. F#?This happens, when you Powerpoint without test harness! Lets kick the PowerPoint and.... Correct the agenda using....
- 6. F#?This happens, when you Powerpoint without test harness! Lets kick the PowerPoint and.... Correct the agenda using....Java guy? Great!
- 7. Demo.... Source available @ github: https://github.com/ramik/Demo/blob/master/FunctionalTutorial/CSharpExamples/PresisDemo/SlideDemo.fsAnd if you don’t have internet access, snapshotted source just for youmodule SlideDemoopen System;type PresentationKeeper(name: string, employer : string) = member lollis.name = name member fuulis.employer = employer override this.ToString() = name + ", " + employerlet Rami = PresentationKeeper("Rami Karjalainen", "Reaktor")let Tuomas = PresentationKeeper("Tuomas Hietanen", "Basware")let topics = [ (2, "Functional programming from c# perspective, Linq principles", Tuomas); (1, "Functional programming in general", Rami); (3, "F# examples: ’basic’ stuff", Rami); (4, "F# and C# interoperability", Rami); (5, "F# vs. C#", Tuomas) ]let formatTopic topic keeper = String.Format ("{0} ({1})", topic, keeper.ToString())let pimpTheList = topics |> Seq.sortBy (fun (prio,_,_) -> prio) |> Seq.map (fun (_, a, b) -> a,b) |> Seq.map (fun x -> (formatTopic (fst x) (snd x)))let printPimped x = x |> Seq.iter (fun c -> printfn "%s" c)
- 8. Why F#?
- 9. Why F#?Well, simply because its fun!
- 10. Why F#?Well, simply because its fun!(fun is reserved keyword, for expression)!
- 11. F# has / is:SuccintClosuresFunctionalGenericsDiscrimated unions.net official language (v4 )Pattern matchingTail recursion optimization TuplesImmutable by defaultasynchronous workflowsVery expressiveInteroperableType inferenceClassesInfinite lists etc. (laziness) Strongly typedHybrid (oo, imperative)Lambda expressions (anon func)REPL (interactive)OCaml
- 12. F# has / is:But for now, lets focus on this!Functional
- 13. Well, what is functional programming?Immutable constructs
- 14. Functions as first class ”citizens”
- 15. Recursion
- 16. No mutable state Many other concepts apply, but these are ones to focus in this presentation
- 17. Immutability:Object cannot be changed after creationIn C#, mark fields as readonlyNo mutable state no local variables
- 18. Functions as first class citizens:Functions can be passed as normal parameters CompositionHigher order functionsTakes a function as paramand/orReturns a function as outputFunctions as first class citizens:Functions can be passed as normal parameters CompositionHigher order functionsTakes a function as paramand/orReturns a function as outputTuomas will cover the deeps of the function theory later in the session
- 19. Recursion:In functional programming, no iteration or ”looping”Recursion is very important concept
- 20. Recursion:In functional programming, no iteration or ”looping”Recursion is very important conceptRecursion is very important, as without it ....
- 21. Recursion:In functional programming, no iteration or ”looping”Recursion is very important conceptRecursion is very important, as without it ....
- 22. Recursion:In functional programming, no iteration or ”looping”Recursion is very important conceptRecursion is very important, as without it ....Tail recursion or stack says bye!
- 23. Time to switch to Visual Studio!(for good this time)