Scala Capstone Project

This is the final lesson of the Scala course. In this capstone project, you will apply everything you have learned so far — from Scala basics and functional programming to collections, immutability, error handling, and real-world project structure.

Completing this project demonstrates that you are ready to build production-grade Scala applications.

Project Overview

In this capstone project, you will build a Task Management System using Scala. The application allows users to create, update, delete, and list tasks.

This project reflects how Scala is used in backend services and data-processing systems.

Project Objectives

• Apply Scala syntax and functional programming concepts
• Use immutable data structures
• Work with collections effectively
• Implement clean project structure
• Write readable, maintainable Scala code

Project Structure

A simple and recommended project layout:

scala-capstone/
 ├── src/
 │   └── main/
 │       └── scala/
 │           ├── Task.scala
 │           ├── TaskManager.scala
 │           └── Main.scala
 └── build.sbt

Step 1: Task Model

Each task is represented using a Scala case class. This provides immutability and built-in utility methods.

case class Task(
  id: Int,
  title: String,
  description: String,
  completed: Boolean
)

Step 2: Task Manager Logic

The task manager handles task operations using an immutable list. Each operation returns an updated state.

class TaskManager {

  private var tasks: List[Task] = List()

  def addTask(task: Task): Unit =
    tasks = tasks :+ task

  def listTasks(): List[Task] =
    tasks

  def completeTask(id: Int): Unit =
    tasks = tasks.map {
      case t if t.id == id => t.copy(completed = true)
      case t => t
    }

  def deleteTask(id: Int): Unit =
    tasks = tasks.filterNot(_.id == id)
}

Step 3: Application Entry Point

The Main object demonstrates how the task manager works.

object Main extends App {

  val manager = new TaskManager

  manager.addTask(Task(1, "Learn Scala", "Complete Scala course", false))
  manager.addTask(Task(2, "Build Project", "Finish capstone project", false))

  println("All Tasks:")
  manager.listTasks().foreach(println)

  manager.completeTask(1)

  println("After Completion:")
  manager.listTasks().foreach(println)
}

Concepts Applied

• Case classes and immutability
• Collections and transformations
• Functional updates using map and filter
• Clean separation of logic
• Real-world Scala workflow

Optional Enhancements

• Add file-based persistence
• Implement CLI input
• Add error handling using Try
• Serialize tasks using JSON
• Extend into a web service

Course Completion

You have successfully completed the Scala course. You now understand both object-oriented and functional Scala and are ready to work on real-world projects.

This capstone marks your transition from learner to Scala practitioner.

What’s Next?

You can now move forward to advanced Scala frameworks, big data processing with Spark, or your next Dataplexa module.