README.md

Workshop 01 - Scala basics

Goal

To get familiar with:

• values:

    val a = 1; var b;
  

• functions:

    def some(a:Int):Int = ...
  

• classes:

    class A(a: Int){...}
  

• methods:

    class A {def a() = ...}
  

• inheritance:

    class A extends B with C {...}
  

• case classes:

    case class A(a:Int)
  

• objects:

    object A {...}
  

• packages

• pattern matching:

    a match {
        case 1 => {...}
        case _ => ...
    }
  

Materials

Scala School:

• Basics
• Basics continued

Exercise

1. The sygnum of a number is 1 is the number is positive, -1 if it is negative, and 0 if it is zero. Write a function taht computes this valie

2. Write a Scala equivalent for the Java loop:

    for (int i = 10; i >= 0; i--) System.out.println(i);
   

3. Write a function countdown(n: Int) that prints the numbers from n to 0

4. Write a function that computes x^n, where n is an integer. Use the following recursive definition:

   • x^n = y^2 if n is even and positive, where y = x^n/2
   • x^n = x * x^n-1 if n is odd and positive
   • x^0 = 1
   • x^n = 1/x^-n if n is negative