demo C# and Scala's lazy val and lambda capturing

command_prompt

$ csc test.cs
Microsoft (R) Visual C# Compiler version 2.0.0.61404
Copyright (C) Microsoft Corporation. All rights reserved.

$ mono test.exe eager
MainThread
$ mono test.exe
NewTestThread
$ scalac test.scala 
$ java -cp $SCALA_HOME/lib/*:. TestLazy eager
main
$ java -cp $SCALA_HOME/lib/*:. TestLazy
Thread-0

test.cs

using System;
using System.Threading;
using System.Linq;

class TestLazy {
  Lazy<string> Name = new Lazy<string>(() => Thread.CurrentThread.Name);

  static void Main(string[] args) {
    Thread.CurrentThread.Name = "MainThread";
    var test = new TestLazy();

    if (args.FirstOrDefault() == "eager") {
      // force evaluation of the lazy val
      var dummy = test.Name.Value;
    }

    var thread = new Thread(() => Console.WriteLine(test.Name.Value));
    thread.Name = "NewTestThread";
    thread.Start();
    thread.Join();
  }
}

test.scala

object TestLazy {
  def main(args: Array[String]) = {
    val test = new TestLazy()

    args.headOption match {
      case Some("eager") => test.name
      case _ =>
    }

    val thread = new Thread {
      override def run() = println(test.name)
    }
    thread.start
    thread.join
  }
}

class TestLazy {
  lazy val name = Thread.currentThread.getName
}