Dynamic Runtime

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Dynamic Runtime Languages - What's it all about?

• Ivan Porto Carrero Xero
• http//www.xero.com/nz
• http//flanders.co.nz/blog

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Agenda

• .NET as we know knew it
• The new .NET languages stack
• The DLR and why is it so cool ?
• Objects
• Duck typing
• Extending existing types
• Some ruby magic
• Meta programming
• Interop between C and Dynamic Languages

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.NET as we knew it
C
VB.NET

Common Language Runtime
4
The new .NET stack
C
VB.NET
IronPython
Base Class Libraries
DLR Runtime
Common Type system
Security
Class Loader, GC, JIT, Execution Support
Common Language Runtime
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The new languages stack
DLR
Frameworks
CLR
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The DLR and why is it so cool

• IMHO Best IDE on the market
• Shared dynamic subsystem
• Standard hosting environment
• Based on passing messages to objects
• Full access to the CLR
• Enable fast generation of dynamic code
• One true object

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The DLR and why is it so cool

• Classic implementation of a dynamic language

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The DLR and why is it so cool

• DLR One true object

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Objects

• Demo 1 Person class

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Duck typing

• If it looks like a duck and quacks like a
• Demo 2 similar properties

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Duck typing
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Extending existing types

• C 3.0 has got extension methods
• Ruby supports it natively
• Demo 4 extension methods

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Some ruby magic Mixins

• Simulating multiple inheritance using mixins.
• DRY you can separate all common logic out to one
  place.
• A little similar to an Interface and its
  implementation
• Works with Class (static) methods too

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Some ruby magic Mixins

• Demo 5 Taggable mixin
• Demo 6 Mixin with class methods

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Ruby magic method_missing

• Instead of throwing a NoMethodError
• Catch all for undefined methods
• Mostly used in delegation scenarios
• Syntactic sugar

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Ruby magic method_missing

• Demo 7 Delegation scenario
• Demo 8 Syntactic sugar

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Metaprogramming

• Avoiding boilerplate code
• Taking advantage of adding methods and classes at
  runtime
• Rails ActiveRecord is build on it
• ie. Dataformat drives the code

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Metaprogramming

• Demo 9 Build classes from csv files

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Interop C and Dyn. Lang.

• Core types reference mscorlib
• require mscorlib
• Pretty easy to build wpf apps
• Will allow choice between asp.net webforms or
  rails framework

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Language interop

• Demo 10 REPL
• extending ironruby with the C implementation of
  minutes.ago
• Demo 11
• Rss reader in WPF.

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References

• http//www.ironruby.net/
• http//rubyforge.org/projects/ironruby
• http//blogs.msdn.com/hugunin/
• http//www.iunknown.com/
• http//www.ruby-lang.org/en/
• http//flanders.co.nz/blog

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Questions?