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Some Java programmers can t wrap their heads around the triple concepts of (1) type inference, (2) passing functions/higher-order functions and (3) immutability as the default way of writing code. Most Ruby programmers I ve met don t have those limitations. So, find a Ruby programmer who knows some Java libraries, or find a Java programmer who s done some moonlighting with Rails or Python or JavaScript, and you ve got a developer who can pick up Scala in a week and be very productive with Scala in two months.
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CHAPTER 9 SCALING YOUR TEAM
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Even with the limitation of weak IDE support, head-to-head people can write Scala code two to ten times faster than they can write Java code, and maintaining Scala code is much easier because of Scala s strong type system and code conciseness.
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Yeah, But How Compatible
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You can make the assertion that at the operational level, Scala code and Java code are indistinguishable. I wrote a Scala program and compiled it with -g:vars (put all the symbols in the class file), started the program under jdb (the Java Debugger) and set a break point. This is what I got:
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Step completed: "thread=main", foo.ScalaDB$$anonfun$main$1.apply(), line=6 bci=0 6 args.zipWithIndex.foreach(v => println(v)) main[1] dump v
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v = { _2: instance of java.lang.Integer(id=463) _1: "Hello" }
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foo.ScalaDB$$anonfun$main$1.apply (ScalaDB.scala:6) foo.ScalaDB$$anonfun$main$1.apply (ScalaDB.scala:6) scala.Iterator$class.foreach (Iterator.scala:387) scala.runtime.BoxedArray$$anon$2.foreach (BoxedArray.scala:45) scala.Iterable$class.foreach (Iterable.scala:256) scala.runtime.BoxedArray.foreach (BoxedArray.scala:24) foo.ScalaDB$.main (ScalaDB.scala:6) foo.ScalaDB.main (null)
main[1] print v
v = "(Hello,0)"
CHAPTER 9 SCALING YOUR TEAM
My code worked without any fancy footwork inside of the standard Java Debugger. The text of the line that I was on and the variables in the local scope were all there, just as if it was a Java program. The stack traces work the same way. The symbols work the same way. Everything works the same way. Scala code looks and smells and tastes to the JVM just like Java code. Now let s explore why.
A Tad Bit of History
A long time ago, when Java was Oak and it was being designed as a way to distribute untrusted code into set-top boxes (and later browsers), the rules defining how a program executed and what were the means of the instruction set (bytecodes) was super-important. Additionally, the semantics of the program had to be such that the Virtual Machine running the code could verify that (1) the code was well behaved and (2) the source code and the object code had the same meaning. For example, the casting operation in Java compiles down to a bytecode that checks that the class can actually be cast to the right thing and the verifier ensures that there s no code path that could put an unchecked value into a variable. Put another way, there s no way to write verifiable bytecode that can put a reference to a non-String into a variable that s defined as a String. It s not just at the compiler level but at the actual Virtual Machine level that object typing is enforced. In Java 1.0 days, there was nearly a 1:1 correspondence between Java language code and Java bytecode. Put another way, there was only one thing you could write in Java bytecode that you could not write in Java source code (it has to do with calling super in a constructor). There was one source code file per class file. Java 1.1 introduced inner classes, which broke the 1:1 relationship between Java code and bytecode. One of the things that inner classes introduced was access to private instance variables by the inner class. This was done without violating the JVM s enforcement of the privacy of private variables by creating accessor methods that were compiler-enforced (but not JVM-enforced) ways for the anonymous classes to access private variables. But the horse was out of the barn at this point anyway, because 1.1 brought us reflection, and private was no longer private. An interesting thing about the JVM: from 1.0 through 1.6, there has not been a new instruction added to the JVM. Wow. Think about it. Java came out when the 486 was around. How many instructions have been added to Intel machines since 1995 The Microsoft CLR has been around since 2000 and has gone through three revisions, and new instructions have been added at every revision, and source code compiled under an older revision does not work with newer revisions. On the other hand, I have Java 1.1 compiled code that works just fine under Java 1.6. Pretty amazing. Even to this day, Java Generics are implemented using the same JVM bytecodes that were used in 1996. This is why you get the type erasure warnings. The compiler knows the type, but the JVM does not, so a List<String> looks to the JVM like a List, even though the compiler will not let you pass a List<String> to something that expects a List<URL>. On
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