Getting Started – Scala

Let us start with

• Brief history of Scala
• Scala REPL or CLI

Brief History of Scala

Let us understand the history of Scala and also few details about this programming language

• Scala is JVM based programming language
• JVM – Java Virtual Machine is the abstraction layer between programming language and underlying operating system
• Scala programs will be compiled into Java byte code
• Even though Scala programs compiles into Java byte code – syntactically it is very different from Java
• Scala’s syntax follow Functional programming paradigm
• Martin Odersky is the founder of the language
• It is founded in Year 2001
• Scala is open source and object oriented
• Architecture of JVM based programming language

• List of JVM based programming languages

• Consolidated view of JVM based programming languages architecture

Scala REPL or CLI

As part of this topic we will understand what REPL is

• Make sure to set up Scala as per this blog post
• REPL stands for Read-Evaluate-Print-Loop
• It is also called as Command Line Interface
  • SQLPLUS
  • Python
  • and many more are traditional examples
• It is interactive way of validating the code
• Once you hit enter or control+D in :paste mode, the code will be
  • Read
  • Evaluated (Compiled and run)
  • Printed (output will be printed)
  • Looped (will wait for another code snippet)
• :help – to get the help of REPL
• :quit – to quit from REPL
• :javap – to see metadata of the compiled classes
• :paste – to come up with multi line code
• Here are the list of commands available