Basics

Introduction

An excerpt from wiki

Scala is a general-purpose programming language providing support for both object-oriented programming and functional programming. The language has a strong static type system. Designed to be concise, many of Scala’s design decisions are aimed to address criticisms of Java.

It is executed in a JVM. .scala file compiles to executable byte code by scala compiler. Byte Code is executed in JVM on different Operating systems

Variables

Two types of variables in scala

  • immutable
    • any variable declared as val, can not be re-assigned. It is equivalent to Java final keyword.
      object Variables {
      def main(args: Array[String]): Unit = {
      println("Hello World");
          /*
          * Immuatable Variables
          */
          val definedInteger : Int = 3;
          definedInteger = 5 ; // gives compilation error, reassignement of val
      }
  }
  • mutable
    • any variable declared as var. It can be reassigned.
      /*
  * Mutable Variables
  */
  var mutableInteger : Int = 3;
  mutableInteger = 5 // reassignement is allowed