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Subjects

JAVASCRIPTHTMLCSSPYTHONSQLJAVACPPCSHARPPHPTYPESCRIPTCRUBYGOSWIFTKOTLINRUSTRBASHSCALAOBJECTIVE-CDARTPERLLUAMATLABXMLJSONMARKDOWNASSEMBLYLATEXYAMLSOLIDITYBLOCKCHAIN

Topics

Scala Basics

Introduction to ScalaInstalling ScalaScala REPLScala SyntaxScala VariablesScala Data TypesScala OperatorsScala CommentsScala Type InferenceScala ExpressionsScala Statements

Control Structures

Scala If-Else StatementsScala Match ExpressionsScala For LoopsScala While LoopsScala Do-While LoopsScala Break and Continue

Functions

Scala Function BasicsScala Function ParametersScala Return ValuesScala Anonymous FunctionsScala Higher-Order FunctionsScala Partial FunctionsScala CurryingScala Function Composition

Object-Oriented Programming

Scala ClassesScala ObjectsScala TraitsScala InheritanceScala ConstructorsScala Access ModifiersScala Companion ObjectsScala Case ClassesScala Sealed Traits

Collections

Scala ArraysScala ListsScala SetsScala MapsScala TuplesScala SequencesScala VectorsScala RangesScala Collection Operations

Functional Programming

Scala ImmutabilityScala Pure FunctionsScala RecursionScala Pattern MatchingScala Option TypeScala Either TypeScala Try TypeScala Lazy Evaluation

Advanced Topics

Scala ImplicitsScala Type ClassesScala GenericsScala VarianceScala Existential TypesScala Path-Dependent TypesScala Self-Type AnnotationsScala Structural Types

Concurrency and Parallelism

Scala FuturesScala PromisesScala ActorsScala Parallel CollectionsScala Async/Await

Testing and Debugging

Scala Unit TestingScala ScalaTest FrameworkScala Specs2 FrameworkScala Debugging Techniques

Scala Build Tools

Scala SBT (Simple Build Tool)Scala Maven IntegrationScala Gradle Integration

Scala Ecosystem

Scala Standard LibraryScala Play FrameworkScala AkkaScala SlickScala CatsScala Scalaz

Interoperability

Scala and Java InteropScala on JVMScala.js (JavaScript)Scala Native

Best Practices

Scala Code StyleScala Performance OptimizationScala Design PatternsScala Functional Design

SBT (Simple Build Tool) in Scala

SBT, or Simple Build Tool, is the de facto standard build tool for Scala projects. It provides a powerful and flexible framework for managing dependencies, compiling code, running tests, and packaging applications.

Purpose and Key Features

SBT streamlines the development process for Scala projects by offering:

  • Dependency management
  • Incremental compilation
  • Continuous compilation and testing
  • Integration with popular testing frameworks
  • Custom task definition
  • Plugin ecosystem

Basic Structure

An SBT project typically consists of the following elements:

  • build.sbt: The main build definition file
  • project/ directory: Contains additional build definitions and plugins
  • src/ directory: Houses the source code and test files

Example: build.sbt


name := "MyScalaProject"
version := "1.0"
scalaVersion := "2.13.6"

libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.9" % Test

Common SBT Commands

Here are some frequently used SBT commands:

  • sbt compile: Compiles the project
  • sbt test: Runs all tests
  • sbt run: Runs the main class
  • sbt package: Creates a JAR file
  • sbt console: Starts the Scala REPL with project classes and dependencies

Dependency Management

SBT simplifies dependency management. Add dependencies to your build.sbt file like this:


libraryDependencies ++= Seq(
  "org.typelevel" %% "cats-core" % "2.6.1",
  "com.typesafe.akka" %% "akka-actor" % "2.6.15"
)

Custom Tasks

SBT allows you to define custom tasks. Here's an example:


lazy val hello = taskKey[Unit]("Prints 'Hello, SBT!'")
hello := println("Hello, SBT!")

Run this task using sbt hello.

Best Practices

  • Keep your build.sbt file clean and organized
  • Use SBT plugins for common tasks
  • Leverage Scala.js for JavaScript compilation when needed
  • Utilize parallel collections for improved build performance
  • Integrate with unit testing frameworks like ScalaTest or Specs2

Integration with IDEs

Most Scala IDEs, such as IntelliJ IDEA and Visual Studio Code (with Metals), offer excellent SBT integration. This allows you to run SBT commands directly from your development environment.

Conclusion

SBT is a powerful tool that significantly enhances Scala development workflows. By mastering SBT, developers can streamline their build processes, manage dependencies efficiently, and improve overall productivity in Scala projects.