Scala Session Cheatsheet

1> 1 + 2
2> println("Hello, world!")
3> var x: Int = 42
4> x = 43
5> val msg: String = "Hello, world!"
6> msg = "Goodbye cruel world!" 
6> def my_max(x: Int, y: Int) = if (x > y) x else y
7> my_max(3, 5)
8> for (c <-"Stratosphere") println(c)
9> :q

10> abstract class Shape {
     def getArea(): Int
    }
11> class Rectangle(x: Int, y: Int) extends Shape {
        def getArea(): Int = x*y
    }
12> class Point(val x: Int, val y:Int)
13> class Circle(radius: Int, center: Point) extends Shape {
        def getArea(): Int = radius*radius*3
        override def toString = "{(" + center.x + "," + center.y + ")," + radius + "}"
    }

14> def fact(n: Int): Int = if (n == 0) 1 else n*fact(n-1)
15> def squares(lst: List[Int]) = lst.map(x => x*x)