Scala basics: What is Scala?

24 November 2008 4 Comments

Many people do not know about the programming language Scala, or why they should care. I think you should care, because Scala has some nice secrets from which you can learn a lot. Scala is a great excuse for learning new things. Even if you never use Scala again, it can be a nice addition to any programmer’s toolbox.

No matter what language you are programming in, it is a good habit to look at new developments. New ways of doing stuff keeps your brain alive. You become a better programmer with your existing tools. And maybe you get some new tools in the process.

So, onto the first question, What is Scala?

What is Scala?

Scala is a relatively young programming language. It has the following distinguishing features:

Java compatible bytecode
Functional programming language

Java compatible bytecode

Scala is a bit special because it runs on the Java virtual machine. This means that Scala code will compile into Java compatible bytecode. For the Java programmers, this means you can integrate Scala directly into your Java projects. This means that it is possible to create a Java interface and implement it in Scala. Or call Scala methods from Java. It also means that you can use a truckload of existing Java libraries with Scala.

This is very neat, as you do not have to convert entire projects to Scala. You can use Scala in the spots where it fits, and use Java as the main language. This makes Scala look a lot more interesting, especially in big Java shops.

Functional programming language

Scala is a functional programming language. To give a tip-of-the-iceberg-idea: every function is an object. Scala gives the possibility to pass values, but also to pass calculations to methods. This is very powerful and opens a lot of doors to all kinds of new programming constructs.

In Scala, you can make the following constructs very easily:

Anonymous functions
Pass a function as argument to another function
Nested functions
Function as return value of a function

The Hello World example

As any post about a new programming language, I cannot omit the Hello World example.

So, download Scala, copy/paste the following code and get started!

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

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