CODEWITHSUNDEEP
scalafunctional-programmingrecursive-datastructures
DataT
DataT

Reputation: 85

Converting List of lists to Stream - Functional Programming

I am working on Scala to convert list of lists to list of customized object "Point" 

class Point(val x: Int, val y: Int) {
   var cX: Int = x
   var cY: Int = y
  }

Should I use Foreach or should I use Map or foreach in this case

def list_To_Point(_listOfPoints :List[List[String]]) : List[Point] = { 

    var elem = 
    lazy val _list:  List[Point] = _listOfPoints.map(p=> new Point(p[0],p[1])
      _list
  }

I couldn't figure out where the problem exactly ?

Upvotes: 0

Views: 231

Answers (2)

Stefan Kunze
Stefan Kunze

Reputation: 751

ugly as hell and untested but it should work (pls consider making your structures immutable) :

case class Point(x:Int,y:Int) 




object Point {


  def listToPoint(listOfPoints:List[List[String]]):List[Point] =
    listOfPoints.map(p => new Point(p(0).toInt,p(1).toInt))
}

Upvotes: 1

Marth
Marth

Reputation: 24832

 def listToPoint(l:List[List[String]]):List[Point] = 
     l.collect({case x::y::Nil => new Point(x.toInt,y.toInt)})

But you really shouldn't use a List[String] to represent what is basically (Int,Int) …

Upvotes: 4

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