CODEWITHSUNDEEP
scala
stretcherCase
stretcherCase

Reputation: 1

Scala case class type issue

I am trying understand some Scala code I was given to debug, and why it does not work as expected. (p.s. newbe alert wrt Scala).

case class ColNmbr(colNmbr: Int)

def getValidColumns(m: Matrix): List[ColNmbr] = {
    var l1 = matrix.zipWithIndex
    var l2 = l1.filter(tp => !checkCol(tp._1)).map(_._2)
    println("result:" + l2)

    l2
}

Matrix is just a List of Lists.

The code is supposed to return a list of column indexes of all matrix columns that pass a validity check which returns a boolean. The data is correct as at the println, but there is a type error because l2 is a List[Int] instead of a List[ColNmbr]. I cannot change the case class, so how do I get the types to match?

Upvotes: 0

Views: 89

Answers (1)

pedrorijo91
pedrorijo91

Reputation: 7865

case class ColNmbr(colNmbr: Int)

def getValidColumns(m: Matrix): List[ColNmbr] = {
    var l1 = matrix.zipWithIndex
    var l2 = l1.filter(tp => !checkCol(tp._1)).map(_._2)
    println("result:" + l2)

    l2.map(ColNmbr)
}

Upvotes: 1

Related Questions