This repo is a custom fork of https://github.com/yoeo/scala-explained.

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Scala explained

Scala is a programming language that let you write cool stuff like:

def sing(i: Int) = s"Happy Birthday ${ if (i == 3) "dear Tom" else "to You" }"
(1 to 4).map(sing).foreach(println)
/* -->
Happy Birthday to You
Happy Birthday to You
Happy Birthday dear Tom
Happy Birthday to You
*/

This website explains Scala features that will help you understand Scala programming. Each explanation is illustrated by a code snippet that can be copy-pasted into a Scala interpreter.

Talking about a Scala interpreter, here's how you can set up Scala programming tools:

Setup Scala environment

• For most cases JVM (usually provided by JDK) must be pre-installed in order to run Scala codes.

• When Java is ready, install Scala from the official website: https://www.scala-lang.org/download/.

• Verify the installation by checking Scala version with the command:

  scala -version
  # --> Scala code runner version 2.12.19 -- Copyright 2002-2024, LAMP/EPFL and Lightbend, Inc.

• Create a Scala source code file named HelloWorld.scala with the following content:

  // aligning the main class with the file name is not compulsory but recommended
  object HelloWorld {
    // the `main` method is the program entry point
    def main(args: Array[String]): Unit =
      println("Hello, world!")
  }

• Compile and run your Scala program using your favorite Scala environment (IntelliJ, sbt) or through a terminal:

  scala HelloWorld.scala
  # --> Hello, world!
  
  # or alternatively
  scalac HelloWorld.scala
  scala HelloWorld
  # --> Hello, world!

• You can also use Scala REPL, an interactive command-line environment for evaluating and executing small code snippets.

Start!

First of all, we will talk about Scala basic syntax.

If you are already familiar with Scala, you can learn more about Scala cool functional programming (FP) features here.

If you want to build beautiful software architectures, you can take a look at Scala mind blowing object concepts.

For the most curious among you, there is also an exhaustive list of Scala keywords and symbols with plenty of examples.

Enjoy.