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Create DataMatrix in Font > scalac File1.scala File2.scala

> scalac File1.scala File2.scala
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CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
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However, startup time for the compiler is non-trivial. You can also compile using the fast Scala compiler, fsc:
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> fsc File1.scala File2.scala fsc is a separate compiler process that continues to run, waiting for new compilation jobs,
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even after the compilation process is finished. This results in much faster compilation times, but if you re on a machine with limited RAM, you might not want to keep the compilation process alive. If you are working on medium-sized to large projects, you probably use some sort of build tool such as Ant or Maven. There are Scala plug-ins for both Ant and Maven, so you can integrate Scala code into existing Java projects with very little effort and no requirement of using new build tools.1
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Your First Scala Programs
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In this section, we re going to write a couple of basic Scala programs. These programs will give you a sense of Scala s flavor and get you acquainted with running Scala programs.
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Hello World
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Yep, it s the ubiquitous Hello World program. In Scala, it s short, simple, and to the point. Open up your favorite text editor: Emacs, vi, TextMate, whatever. Create a new file called HelloWorld.scala and place the following line in it:
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println("Hello World!")
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Save the file. Open a terminal window or command prompt and change into the directory where the file is and type scala HelloWorld.scala. You should see
Hello World!
1. See http://www.scala-lang.org/node/91 for an up-to-date list of IDE plug-ins and other tools for creating Scala programs. You can join the Scala tools mailing list at http://www.scala-lang.org/node/199.
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
In Scala, you can write simple programs that look and feel like scripts that you would write in Ruby or Python. In this case, you re calling the println method with the string constant Hello World!. It s a thin layer on top of System.out.println(). Because println is used so frequently, it s part of Scala s Predef, the predefined stuff that s automatically part of every program. This is like the java.lang package that is automatically imported in every Java program.
Printing Some Numbers
Let s write a program that will print the numbers from 1 to 10 in the Print1.scala file:
for {i <- 1 to 10} println(i)
You can run the code by typing scala Print1.scala in the terminal. The program assigns the numbers 1 to 10 to the variable i and then executes println(i), which prints the numbers 1 to 10. for means much more in Scala than in Java. You can nest expressions in a for comprehension (the fancy Scala name for the for statement). In the Print2.scala file, put
for {i <- 1 to 10 j <- 1 to 10} println(i * j)
In this program, we re iterating over 1 to 10 in an outer loop and assigning each number to i. In the inner loop, we re also iterating from 1 to 10 and assigning each number to j. The product of i * j is printed, so you ll see 100 lines output. There are many more uses of the for comprehension that we ll cover later in the book.
Adding Things Up
The next program will read all the lines from the input and sum each line that contains a valid integer. This program introduces you to a substantial number of Scala s concepts, including passing functions as parameters, Scala s type system, immutable data structures, and more. It s a bit of a dive into the deep end, so let s go. Create a file called Sum.scala containing the code in Listing 2-1.
CHAPTER 2 SCALA SYNTAX, SCRIPTS, AND YOUR FIRST SCALA PROGRAMS
Listing 2-1. Sum.scala import scala.io._
def toInt(in: String): Option[Int] = try { Some(Integer.parseInt(in.trim)) } catch { case e: NumberFormatException => None } def sum(in: Seq[String]) = { val ints = in.flatMap(s => toInt(s)) ints.foldLeft(0)((a, b) => a + b) } println("Enter some numbers and press ctrl-D (Unix/Mac) ctrl-C (Windows)") val input = Source.fromInputStream(System.in) val lines = input.getLines.collect println("Sum "+sum(lines))
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