Scala Exercises

exercises.scala

This is how we create an inclusive/exclusive range of Ints:

  val ie = 0 until 500

//1. Fill in the missing item to create a range of Ints from 1 to 100 inclusive

  val ints = 1 ??? 100

//2. Find the sum of the integers in this range

  val sum = ???

//3. Write a function to calculate the remainder of an integer when divided by 3.
//   Note we write % to denote remainder: e.g. 5 % 3 is 2

  val rem3: Int => Int = ???

//4. Partition all ints between 1 and 100 into those that are divisible by 3 and those that are not

  val (divisibleBy3, notDivisibleBy3) = ???

//5. Calculate the sum of those ints between 1 and 100 which are not divisible by 3

  val result = ???

//6. Construct a List[String] by taking each int j in the range 1 to 10 and making the String 'j + " men went to mow"'

  val mowers = 1 to 10 map ???

//7. Construct an Address class. It should have fields for house number (an Int), street name (a String), city (also a String), zip code (an Int) and country (a String)

  case class Address(???)

//8. Given a List of addresses; find the Set of cities in which they reside

  val cities = addresses ???

//9. Show 3 different ways of writing a function which maps a String to its length:

  val strlen1 = (s: String) => { s.length }

//10. Write a method which will group a Set of Strings by their length. The method's signature should look like this:

  def groupStringsByLength(s: Set[String]): Map[Int, Set[String]] = ???