Scala program examples

Category : Scala | Sub Category : Scala Programs | By Prasad Bonam Last updated: 2023-07-10 07:02:54 Viewed : 355

Scala program examples :

Here are a few Scala program examples that demonstrate various concepts:

1. Hello, World!: A simple Scala program that prints "Hello, World!" to the console.

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object HelloWorld {
  def main(args: Array[String]): Unit = {
    println("Hello, World!")
  }
}

2. Factorial Calculation: A program that calculates the factorial of a given number using recursion.

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object Factorial {
  def factorial(n: Int): Int = {
    if (n <= 0) 1
    else n * factorial(n - 1)
  }

  def main(args: Array[String]): Unit = {
    val num = 5
    val result = factorial(num)
    println(s"The factorial of $num is $result")
  }
}

3. Fibonacci Series: A program that generates the Fibonacci series up to a given number of terms.

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object Fibonacci {
  def fibonacci(n: Int): List[Int] = {
    def fibHelper(n: Int, a: Int, b: Int, acc: List[Int]): List[Int] = {
      if (n <= 0) acc
      else fibHelper(n - 1, b, a + b, a + b :: acc)
    }

    fibHelper(n, 0, 1, List(0))
  }

  def main(args: Array[String]): Unit = {
    val numTerms = 10
    val series = fibonacci(numTerms)
    println(s"The Fibonacci series up to $numTerms terms: $series")
  }
}

4. Case Class and Pattern Matching: A program that demonstrates the usage of case classes and pattern matching to represent and process geometric shapes.

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sealed abstract class Shape

case class Circle(radius: Double) extends Shape

case class Rectangle(width: Double, height: Double) extends Shape

case class Square(side: Double) extends Shape

object ShapeArea {
  def calculateArea(shape: Shape): Double = shape match {
    case Circle(radius) => math.Pi * radius * radius
    case Rectangle(width, height) => width * height
    case Square(side) => side * side
  }

  def main(args: Array[String]): Unit = {
    val circle = Circle(5.0)
    val rectangle = Rectangle(4.0, 6.0)
    val square = Square(3.0)

    val circleArea = calculateArea(circle)
    val rectangleArea = calculateArea(rectangle)
    val squareArea = calculateArea(square)

    println(s"Circle area: $circleArea")
    println(s"Rectangle area: $rectangleArea")
    println(s"Square area: $squareArea")
  }
}

These are just a few examples to give you a taste of Scala programming. Scala offers a wide range of features, such as functional programming, immutability, pattern matching, and type inference, which can greatly enhance the expressiveness and conciseness of your code.