Learn SCALA with Real Code Examples

Download Scala from https://www.scala-lang.org/

Use SDKMAN! or package managers for installation

Install sbt (Scala Build Tool) for project management

Set up an IDE (IntelliJ IDEA, VSCode with Metals)

Verify installation via REPL with `scala` command

Install Scala via official website or SDKMAN!

Install sbt for project management

Use IDE with Scala plugin (IntelliJ or VSCode)

Test REPL commands with `scala`

Ensure Java JDK is installed and configured

application.conf - configuration file

build.sbt - project configuration

project/plugins.sbt - sbt plugin definitions

src/main/scala - application code

src/test/scala - test code

scala MyApp.scala - run Scala script

scalac MyApp.scala - compile Scala code

sbt run - run sbt project

sbt test - run tests

sbt clean compile - clean and build project

Use configuration files or resource bundles

Scala libraries like i18n for localization

Handle UTF-8 encoded strings

Switch languages at runtime via configuration

Support multiple locales in applications

Depends on target UI framework

Ensure accessible APIs when using Play or Scala.js

Provide semantic labels for HTML elements

Follow web accessibility standards

Test with screen readers when applicable

Scala itself has no UI

Used in backend or with web frameworks like Play

Front-end may use Scala.js for browser UI

Styling handled via HTML/CSS frameworks

Reactive UI through Scala.js or frontend frameworks

Immutable `val` for constant state

Mutable `var` for local state

Actors encapsulate state for concurrency

Option and Either for safe state handling

Case classes for structured data

Collections: List, Set, Map, Vector

Persistent and immutable by default

Pattern matching for data extraction

Serialization with JSON libraries (circe, play-json)

Interoperability with Java collections when needed