iulianu

import scala.collection.JavaConverters._

// you can write to stdout for debugging purposes, e.g.
// println("this is a debug message")

object Task1Solution {

  def phoneMetric(number: Int): Long = {
    val numberStr = number.toString
    100000000000L * numberStr.size +

iulianu

import scala.annotation.tailrec
import scala.collection.JavaConverters._

// you can write to stdout for debugging purposes, e.g.
// println("this is a debug message")

object Task2Solution {
  class TransformationIterator(s: String, removable: String) extends Iterator[String] {
    var i = 0
    val remLen = removable.length

iulianu

require 'zlib'

APACHE_LINE_RX = /^([0-9\.]+)\s+\S+\s+\S+\s+\[[^\]]+\]\s+\"[^\"]+\"\s+(\d+)\s+(\d+).*$/
def parse_apache_line(text_line)
  if text_line =~ APACHE_LINE_RX
    {:ip => $1, :bytes => $3.to_i}
  else
    nil
  end
end

iulianu

import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
  def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = {
    data.map(v => MaybeFilter(query.filter(f(v)))).getOrElse(this)
  }
}

// example use case
import java.sql.Date

iulianu

sealed trait ContextDescription {
  def value: String
}
final case class EmailContext(value: String)  extends ContextDescription
final case class MobileContext(value: String) extends ContextDescription
// ...
Seq(EmailContext(email), MobileContext(mobile)).
  filter(_.value.nonEmpty).
  map( context =>
    LocalPersonContext(

iulianu

scala> val kidsNames = List("John", "George", "Victor")
kidsNames: List[String] = List(John, George, Victor)

scala> val beatlesNames = List("John", "Ringo", "Paul", "George")
beatlesNames: List[String] = List(John, Ringo, Paul, George)

scala> kidsNames.intersect(beatlesNames)
res2: List[String] = List(John, George)
// Looks reasonable!