Scala: hacker rank Update List

Objective :- https://www.hackerrank.com/challenges/fp-update-list

Solution :

def f(arr:List[Int]):List[Int] =
{
var l = scala.collection.mutable.ListBuffer.empty[Int]

var res = arr.foreach { x => if(x < 0) l+=(x)*(-1) else l+=x }
l.toList
}

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