Coverage.scala

Coverage.scala

 case class Shift(start: DateTime, end: DateTime)
                              
 case class Coverage(time: DateTime, amount: Int)
   
 def findCoverages(increment: Int, shifts: List[Shift]): List[Coverage] = {
  shifts.map(s => generateDates(increment, s.start, s.end))
    .flatten //Going from List[List[DateTime]] to List[DateTime]
    .groupBy(dt => dt) //just grouping by date, groupBy always returns a Map[Key, List[Value]]
    .map(kv => Coverage(kv._1, kv._2.size)) //when mapping over a Map/Dictionary, the parameter is a tuple, with _1 being the key and _2 being the value
   .toList                  
 }
  
  def generateDates(i: Int, startDate: DateTime, endDate: DateTime): List[DateTime] = 
    if (startDate.plusMinutes(i).isBefore( endDate) )
      startDate :: generateDates(i, startDate.plusMinutes(i), endDate) //generateDates(startDate.plusMinutes(i), endDate).prepend(startDate)
    else                     
      List(startDate)