An Introduction to Microsoft F#

The Discussion

• 

  This is really really cool, exactly what I've wanted to see in regards to F#.. I've seen so many little examples that really didn't help me envisage using this every day..
  
  let the |> fun commence
  
  (hurr!)
  

• 

  Wow - this the best show I've seen here so far - it even outperforms "don't fear the monads"
  Hope to see more of this stuff around.
  
  Thanks for the fun !

• 

  Appaluse!
  
  Encore.

• 

  Yea, I really enjoyed this presentation . One of best. It gives nice tasting of F#. I recommend this. 

• 

  regarding the pipeline (|>) operator example: couldn't one just write Seq.sum(Seq.map(nums,sqr) and get done with it?

• 

  |> is like . (dot) in C# - especially when talking about extension methods.

• 

  Thank you so much.  So much F# in so little time.  I've already had some fun with this language, and your presentation helps me to understand how to solve some practical business problems (like I do with C# and VB.NET, presently).
  
  Kudos!

• 

  Great Presentation!
  I am watchin git for the second time and coding along through the demo. However,  I am getting an error in the StockAnalyzer type... 
  

  type StockAnalyzer (lprices, days) =

  let prices =
          lprices
          |> Seq.map snd
          |> Seq.take days
  static member GetAnalyzers (tickers,days) = 
      tickers
      |> Seq.map loadPrices
      |> Seq.map (fun prices -> new StockAnalyzer (prices, days))
  member s.Return = 
      let lastPrice = prices |> Seq.nth 0
      let startPrice = prices |> Seq.nth (days - 1)    
      lastPrice / startPrice -1.
  
  ... the last line is not working ... getting "This value is not a function and cannot be applied" error when mouseover startPrice variable. Any advice for f# newbie? I am running the 1.9.6.2 version of f# with VS  integrated shell.
  Thanks!
  mspan
  www.fsharpener.blogspot.com

• 

  Isn't something like this more succinct but just as expressive without losing the declarative nature?
  
  exm.
  
  let sumOfSquares nums = sum (each nums sqr)
  
  sumOfSquares [0,2,5,8]

• 

  Very great presentation. Thanks Luca.
  
  The async stuff didn't work for me. In fact, neither AsyncGetResponse nor AsyncReadToEnd exist in my version (.Net 3.5 under MSVS2008). The Plot function of Graphics is also not available. Seems to me like a special library is needed...

• 

  Really good presentation. Looking forward for more of F#.

• 

  elvistcb: yes there is:
  (define (sum-of-squares nums) (fold-left + (map sqr nums)))
  (sum-of-squares '(0 2 5 8))
  

• 

  This is the best presentation I've ever seen come out of MSFT! Congrats. As a fresh CS grad, I've heard academic whispering about functional programming but have never had the opportunity nor took the initiative to dig any deeper and learn it for myself. I'm excited that a pragmatic, .NET interoperable, first-class functional language is on the way from Microsoft. Great work guys! After 20-odd years following the computer industry I've never been happier with Microsoft. F# (and Oslo) show that Microsoft is not being complacent. And after Apple's all-style-no-substance "I'm a Mac; I'm a PC" campaign I even find myself rooting for MSFT. But I'm rambling in short great work on F# and a great introductory presentation with a sprinkling of humour .

• 

  Awesome video. 

• 

  Good Presentation!

  After the presentation, I had some fun with this F#. 

  It's an interessting language like C#.

  Thanks.

  -Raja

  +1 404 424 4674

• 

  In regard to the examples, can you share the C# utilities and .dll files? 

  Thanks,

• 

  Can you post the code files used in the demo/talk?

  Thanks

• 

  Superb presentation, thanks.

• 

  Hello Luca,

   

  this video is fantastic!! Very intetresting. This F# remembers me the time when I was studing ML.

  Seems very very promising.

   Saluti da Reading - UK

   Marcco -- StockTrader

• 

  This is one of the greatest presentations. Thanks Luca, you're damn good)

• 

  Non capisco una cosa: lavori in Microsoft e mi sembri una persona in gamba, perche' non fai un bel corso di pronuncia inglese? Neanche nei film gli italiani parlano inglese in quel modo! :)
  -----
  I don't understand one thing: you are a Microsoft employee and yet you don't know how to pronounce english? Not even in movies italians pronounce english that way! :D

• 

  Bravissimo!

• 

  nice =)

• 

  Excellent talk mate.

• 

  @birbilis: more compact yes, simpler to understand no

• 

  Concise and entertaining one-hour intro to F#.
  Excellent 
  

• 

  @birbilis:
  Pipelining functions with classical C-Syntax gets messy when you have many functions with many parameters.
  Syntax itself changes the way you percieve programming -- it does indeed matter. If you use C# with and without LINQ, you notice how massive the difference between a functional approach and a sequential/imperative approach can be.
  I'm a big fan of the new functional features emerging in .NET, and this takes it a step further.

• 

  @Zibri:I am American and had no trouble understanding him.  His English is excellent.  Very nice video!

• 

  What an amayzing presentation!
  Teachs a lot! And the examples are practical application than to play with list of numbers and characters.
  Cheeeeeeeeeeeeeeerrrrrrrsssss
  

• 

  Such a relaxed presentation ! Good one

• 

  This is really an awesome presentation. Thanks

• 

  The best accent I've ever heard! :)

• 

  The best accent I've ever heard! :)

• 

  The best accent I've ever heard! :)

• 

  Excellent presentation!! Informative and comical at the same time

• 

  Hi!
  I entered the same code as in 38:11 but when I type "grid prices;;", I get "C:\Users\Victor\AppData\Local\Temp\stdin (4,1): error FS0039: The value or constructor ' grid ' is not defined"
  How can I solve the problem. Thanks for your reply!
  Great video by the way!
  /Victor

• 

  @Victor: thanks for your interest!  The best place to ask these questions is over at the MSDN F# forum (http://social.msdn.microsoft.com/Forums/en-US/fsharpgeneral/threads). The short answer to your question is that Luca had already defined "grid" in his project. If you want to use these sorts of charting features in your F# programs, check out this blog post (http://blogs.msdn.com/b/fsharpteam/archive/2011/04/15/getting-started-with-fsharpchart.aspx).

• 

  Great presentation. Shame it wasn't helped with some of the sad attempts at gotcha questions at the end. The biggest problem with this industry is the type who just want to demonstrate to them how 'smart' they are.

• 

  The code for getting the prices in C# using LINQ. It's kind of the same and little shorter.
  
  var prices = csv.Split('\n')
  .Skip(1)
  .Select(line => line.Split(','))
  .Where(values => values.Length == 7)
  .Select(values => new { Date = DateTime.Parse(values[0]), Price = values[6] });