And what happened to your blog?

posted by Jsoh

@35:00

that c# code could have been made a lot more compact with a linq statement when written in linq the f# and c# versions wouldnt look all that diffrent imo

posted by aL_

C

posted by Charles

but thats not my point, my point was that this perticular c# code is not representative of what c# is capable of, i argue that a c# linq query is not hugely diffrent from the f# example shown. there are plenty of other examples where f# really do provide a compact bit of code that really isnt possible to write in c# (pattern matching for example), im just saying a scenario like that would make for a better example of the f# coolness

beeing able to write f# extension methods usable from c# would be a really great enabler for doing just what your saying, using the right tool for the write job. surely you dont disagree with at part of my post?

posted by aL_

posted by Charles

i guess my awnser is that if most of my code is most easily written in c# but f# is more suitable for some parts, id make a c# project and pay the inconvecience of either integrating two projects or writing it all in c#

but if i can write the f# suitable parts in f# and expose them as extension methods, i dont have to choose at all

posted by aL_

C

posted by Charles

I currently try to make usefull F# examples for the company that I currently work for. I use C# for creating stuff like front-ends, main architecture, etc. And I build shared F# libraries to perform the actual computations/data processing in such a way that it easily plugs into the main architecture... (thanks to the excellent support for OO design and .NET in F# )

I love F# because it allows me to focus on the complex problem that I want to solve, without being distracted by all the plumbing code in the background.

p.s.: Thanks to all the people at C9 for all the excellent F# video's!

posted by Laurens

and again, beeing able to create extension methods in f# doesnt contradict what you're saying at all, it further enables it [im still not clear on if thats possible or not]

posted by aL_

posted by Jsoh

now if someone could just awnser my original question, the extension methods?

posted by aL_

What are you trying to accomplish by mixing languages?
C

posted by Charles

extension methods are available across projects and across languages that supports them. are you saying that there are separate versions of Enumerable/Queryable for each language? thats not how it works.. extension methods are just static methods that have been marked as extension methods by their respective compiler. now my question was if there was a syntax for doing that in f# and by extension, if the f# compiler can find and use extension methods.

i did awnser your question, i said that it depends on the situation and the code in question. putting a method like GetProductsWithPriceOver300 in a library just doesnt make sense, for that you use what ever language the rest of your project is in.  that however has absolutly nothing to do with my original post where i just pointed out that the c#/f# comparison in the video is not fair because the full capability of c# 3.0 wasnt used. had linq been used, the two code snipplets show would have been alot more similar.

what am i trying to accomplish? i belive you call it "using the right tool for the task". extension methods greatly streamline this process.

it actually turns out that you can [or at least were able to, again an update on the status of this would be great] create extension methods in f#. you do it with the "with" keyword in f# type declarations.. check out these links:

http://cs.hubfs.net/forums/thread/3451.aspx

http://blogs.msdn.com/dsyme/archive/2006/01/27/FSharpMeetsLinqOne.aspx

http://codebetter.com/blogs/matthew.podwysocki/archive/2008/09/10/object-oriented-f-extension-everything.aspx

posted by aL_

C

posted by Charles

to do what you describe i agree that your compiler prespective is correct it would be pretty cool to be able to do that though

sorry for beeing unclear, its 3 am here, maybe that's why 

posted by aL_

http://stackoverflow.com/questions/702256/f-extensions-in-c   [gotta love stackoverflow]

where an attribute is used to mark extension methods as such. what is the relationship between[<System.Runtime.CompilerServices.Extension>] and the f# "with" keyword? ive read something about extension members in f# but such a member that happens to be a method doenst seem to be the same thing as a "c# extension method"

again, more information on this would be really great

posted by aL_

posted by ni

posted by Charles

posted by ni