Scott Hanselman

Hanselminutes Podcast 29 - Dynamic vs Compiled Languages

August 16, '06 Comments [9] Posted in Podcast | Programming
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My twenty-ninth Podcast is up. This episode is about disruptive technologies like Ruby on Rails, the rise of dynamic languages and what it means to the average .NET developer.

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Links from the Show

BLINQ (heg)
ARSTechnica on BLINQ (hej)
Castle (hen)
LINQ (heh)
Ruby on Rails (hel)
ActiveRecord (hem)
C# 3.0 (hei)
FTP Online Tutorial on BLINQ (hek)

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Wednesday, August 16, 2006 8:13:20 PM UTC
Whats up with the time for the post. Its showing up as 4:57:20 pm, a future time.
surendra
Wednesday, August 16, 2006 8:16:30 PM UTC
Hm...that is weird. Maybe the time is off on the server.
Scott Hanselman
Wednesday, August 16, 2006 8:35:19 PM UTC
I know your good Scott but posting from the future ? ;)
OmegaSupreme
Wednesday, August 16, 2006 11:49:07 PM UTC
Scott,

This latest show is the best one to date. Keep up the good work.

I don't think that developing apps with dynamic languages has to be test-driven, but needs strong testing. Test-driven implies test first, and in a .NET Rocks show (I think one with Ted Neward) someone pointed out that test first loses some intellisense advantages since you are writing tests for methods/objects that don't exist yet. I think part of Carl's skepticism may have been based on the "test first" principles, not in strong, thorough testing overall.

I thought it was great that you pointed out Smalltalk has had these dynamic features for 30 years. Have you look at Smalltalk web application framework, Seaside?

http://www.seaside.st/

As I understand it, Seaside was written by a Ruby on Rails defector who was dissatisfied with the performance of the Ruby interpreter.

Also, I think one of the benefits of Ruby is that it is slipping some more functional programming paradigms into the mainstream, especially higher order functions. Just for fun, you might look into some of the functional/higher order programming things going on in the C++ world via boost, namely lambda and functional.

http://www.boost.org/libs/libraries.htm#Function-objects

Lastly, I would like to get your opinion on data access in ASP.NET. If you were starting a brand new ASP.NET 2.0 application, what would you use for Data Access? The Enterprise Libraries DAAB, NHibernate, Castle's ActiveRecord, or other? As an apps guy trying to learn web development on the side, this question has been troubling me quite a bit.

Anyway, keep up the good work.

Jim
Thursday, August 17, 2006 4:39:28 PM UTC
Where are the PDF transcripts? I looked all over the HanselMinutes site and didn't find them.
Thursday, August 17, 2006 5:12:48 PM UTC
Jon - we're currently transcribing July's...they are under the DOWNLOADS tab...
For example:
http://perseus.franklins.net/hanselminutes_0024.pdf
Scott Hanselman
Thursday, August 17, 2006 6:52:49 PM UTC
Hey Scott- great show! I too am a major fan of rails and am trying to bring it's simplicity (as far as DB's are concerned) into the .NET realm. For our recent beta of the Commerce Starter Kit, I created an "ActiveRecord" base class using generics. This base class will allow you to hook an object up to a DB table simply by

1) Inhereting from ActiveRecord
2) Creating public properties (although you need to do it a certain way, which is not complicated at all)

We don't use reflection either. Inhereting from this base class allows you to do all the CRUD stuff you normally would, as well as full querying (parameterized and sorted). I put together a webcast showing this off - you can see the link on our main page at http://www.commercestarterkit.org

Anyway- nuff about that. Dig the show! I just had a discussion about this very thing with an MS Tech Evangelist (J Sawyer). I was arguing the virtues of Duck Typing :) and we went all over the place about ASP.NET's propensity to (at times) breed complexity...
Friday, August 18, 2006 1:17:23 AM UTC
I think what was most telling about Carl's posture was his initial defensive "we've got stuff too!" comments. But it's good to hear his reaction because he's a smart enough guy and a lot of people I encounter will probably have those same questions.

This was a great show, especially hearing you guys go back and forth about test driven development. I've been trying to think of a way I can introduce it as more than a suggestion to my peers and hearing what you had to say was informative. Two of the big obstacles in our organization to something like this are:
1. Lack of abstract thinking which means that the powers that be have a hard time conceptualizing time saved in the bug/revision cycle since that has to be argued from estimation.
2. Magic deadlines; arbitrarily picked by someone (on a lot of projects including my current one we don't even know *who* picked the date to "finish"). The time of writing tests and training everyone on how to do TDD and coming up with an organized approach seems like unproductive time (see #1) to management.

I think the best thing about these new technologies is that they are as much about ideas as they are about implementations. ActiveRecord, Convention Over Configuration, Test Driven Development - all are agnostic of specific language.

As for dynamic languages my approach is as follows: using Watir and creating utilities for other developers on staff will probably be the best argument for using them. I also think there's a lot I learn by just seeing an approach and doing something similar in .NET -

Did I say that was a great podcast? You're on fire Scott -
Friday, August 18, 2006 9:25:57 PM UTC
I'd caution against saying that TDD and Testing eliminates the need to have compile-time checking of code (this is a statement I've seen made a lot lately). I think they are different and complimentary, and that having either doesn't remove the need/benefit of having the other as well.

One challange with making test cases the sole way to find bugs is that it requires the developer/tester to proactively think up every possible scenario where the code breaks. In reality, none of us are perfect, and there are always cases we forget to cover -- or discover and add later.

One nice benefit with having a type-safe compiler is that it will always perform at least one level of analysis on your code, and help verify/uncover a bunch of issues which you might otherwise forget. For example: type coersion/conversion issues dealing with floats/decimals/doubles/etc that a junior developer in a non type-safe environment could likely make mistakes with (and forget to test) will be automatically caught as a warning/error in C# or VB.NET.

Having a type-safe compiler doesn't at all eliminate the need for testing (a common misperception) or undercut the importance of TDD. But I would argue that it can significantly help in adding further robustness to a code-base.
Scott
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Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.