Iron Sprog Tech Talk

IronSprog //kristiankristensen.dk twitter.com/kkristensen kristian.kristensen@microsoft.com

What makes a language “dynamic”?

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Eksempler C# class Program { static void Main(string[] args) { Console.WriteLine("Hello World"); } } Ruby puts “Hello World”

class Customer < ActiveRecord::Base end

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The traditional view of the world

“CLR hates Dynamic” “The speed of the current system is so low as to render the current implementation useless for anything beyond demonstration purposes.” – ActiveState’s report on Python for .NET “The CLI is, by design, not friendly to dynamic languages. Prototypes were built, but ran way too slowly.” – Jon Udell, InfoWorld, Aug. 2003

Dynamic Languages on .NET IronPython IronRuby Iron? VB.NET C# Common Language Runtime

Dynamic Languages on .NET IronPython IronRuby C# VB.NET Others… Dynamic Language Runtime Expression Trees Dynamic Dispatch Call Site Caching Python binder Rubybinder COMbinder JavaScriptbinder Objectbinder

.NET ?.? DLR2 The Common Language Runtime Script Hosting Compiler as a Service ??? .NET 4.0 DLR Expression Trees v2 Call Site Caching Dynamic Dispatch .NET 3.5 LINQ Expression Trees Extension Methods Silverlight .NET 2.0 Generics In Runtime Fast Delegates Dynamic Methods .NET 1.0 GC Reflection JIT BCL Dynamic Codegen Verifier Sandbox

Multiple Language Dynamic Dispatch IronPython x.Foo IronRuby x.Foo C# x.Foo VB.NET x.Foo Dynamic Language Runtime GetMember Name=“Foo”, IgnoreCase=false ObjectBinder PythonBinder RubyBinder COMBinder

Common Language = CLR + DLR Today’s view of the world

Iron languages arefirst class .NET citizens

IronPython “IronPythonis an open-source implementation of the Python programming language which is tightly integrated with the .NET Framework. IronPython can use the .NET Framework and Python libraries, and other .NET languages can use Python code just as easily.” - IronPython.net

IronRuby “IronRuby is a Open Source implementation of the Ruby programming language for .NET and Silverlight, heavily relying on Microsoft's Dynamic Language Runtime.” - IronRuby.net

IronWhat? True language implementation True to the language True to the community True to the experience Excellent performance Great integration with .NET Easy to use .NET libraries Easy to use other .NET languages Easy to use in .NET hosts Easy to use with .NET tools Implementation Running On .NET

[TestClass] public class StackTest{ [TestMethod] public void NewStackHasZeroElements(){ var s = new Stack<string>(); Assert.AreEqual<int>(0,s.Count); } [TestMethod] public void StackPeekTopElement() { var s = new Stack<string>(); s.Push("bob"); Assert.AreEqual<int>(1,s.Count); Assert.AreEqual<string>("bob",s.Peek()); } [TestMethod] public void StackPopTopElement() { var s = new Stack<string>(); s.Push("bob"); Assert.AreEqual<string>("bob",s.Pop()); Assert.AreEqual<int>(0,s.Count); } }

describe ".NET Stack Operations" do it "should create an instance with zero elements" do Stack.new.count.should.be 0 end it "should let us peek at the element pushed" do s = Stack.new s.push"bob" s.peek.should.be "bob" s.count.should.be 1 end it "should let us pop the element we pushed" do s = Stack.new s.push"bob" s.pop.should.be "bob" s.count.should.be 0 end end

describe ".NET Stack Operations" do ... end defdescribe(description) print "#{description}" yield puts "end" end

s.count.should.be 3 class PositiveExpectation definitialize(obj) @obj = objend defbe(other) if @obj != other print "Fail: wanted #{@obj} got #{other}" else print "Pass" end end end class Object defshould PositiveExpectation.new(self) end end

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// this code assumes language info in app.config varsetup = ScriptRuntimeSetup.ReadConfiguration(); varruntime = new ScriptRuntime(setup); varengine = return runtime.GetEngine("Python"); engine.Execute("2 + 2");

// or you can hard code a specific language varpy_engine= Python.CreateEngine(); py_engine.Execute("2 + 2"); varrb_engine= Ruby.CreateEngine(); rb_engine.Execute("2 + 2");

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