ostretsov

class Animal
trait Furry extends Animal
trait HasLegs extends Animal
class Cat extends Animal with Furry with HasLegs
class Dog extends Furry with HasLegs
class Dog with Furry with HasLegs // won't work

ostretsov

class Animal
trait Furry extends Animal
trait HasLegs extends Animal

ostretsov

class Rectangle(width: Int, height: Int) {
  def getWidth: Int = width
  def getHeight: Int = height
}
class Square(side: Int) extends Rectangle(side, side) {
  def getSomething: Int = 1
}

def area(rectangle: Rectangle): Int = {
  rectangle.getHeight * rectangle.getWidth * rectangle.getSomething // it would't work!

ostretsov

class Rectangle(width: Int, height: Int) {
  def getWidth(): Int = width
  def getHeight(): Int = height
}
class Square(side: Int) extends Rectangle(side, side)

def area(rectangle: Rectangle): Int = {
  rectangle.getHeight() * rectangle.getWidth()
}

ostretsov

class Rectangle(width: Int, height: Int)
class Square(side: Int) extends Rectangle(side, side)

val s = new Square(5)

ostretsov

<?php
/**
 * (c) Artem Ostretsov <artem@ostretsov.ru>
 * Created at 15.10.2014 12:31
 */

namespace SP\EventBundle\Validator\Constraints;

use Symfony\Component\Validator\Constraint;

ostretsov

<?php
/**
 * (c) Artem Ostretsov <artem@ostretsov.ru>
 * Created at 15.10.2014 12:32
 */

namespace SP\EventBundle\Validator\Constraints;


use SP\EventBundle\Entity\EventRequest;

ostretsov

class A(l: Int) {
  private val length = l
}

class AMinified (private val length: Int) // avoid code smell

ostretsov

def f1() = 1
def f2 = 2

f1()
f1
//    f2()  // it doesn't work as expected!
f2

ostretsov

def f1(x: Int, y: Int) = x + y
def f2(x: Int)(y: Int) = x + y

println(f1(1, 2))
println(f2(1) {
  val a = 5
  val b = 6
  a + b
})