Scala

Question 1

Instantiate List

Answer 1

// List of Strings
val fruit: List[String] = List("apples", "oranges", "pears")

// List of Integers
val nums: List[Int] = List(1, 2, 3, 4)

// Empty List.
val empty: List[Nothing] = List()

// Two dimensional list
val dim: List[List[Int]] =
   List(
      List(1, 0, 0),
      List(0, 1, 0),
      List(0, 0, 1)
   )

Question 2

Pattern matching

Answer 2

val x: Int = Random.nextInt(10)

x match {
  case 0 => "zero"
  case 1 => "one"
  case 2 => "two"
  case _ => "other"
}

Question 3

Extension method

Answer 3

case class Circle(x: Double, y: Double, radius: Double)

extension (c: Circle)
  def circumference: Double = c.radius * math.Pi * 2

Question 4

Higher Order Function

Answer 4

def doSomethingWithStuff(strategy: Int => Int, x: Int) = strategy(x)

Question 5

Range (inclusive)

Answer 5

(1 to n)

Question 6

typealias

Answer 6

type bunchOfStuff = Int => Int

Question 7

Traits (interfaces)

Answer 7

trait BunchOfStuff {
  def doSomething(x: Int) : Int
}