Pyramid Array

My:
import scala.collection.mutable.ListBuffer
object Kata {
  def pyramid(n: Int): List[List[Int]] = {
  val arr =ListBuffer.empty[List[Int]]
  def fulling( index: Int=0): List[List[Int]]={
    if(n==0) {arr+=List.empty[Int]
      arr.remove(0)
      arr.toList}
    else if(index<=n) {arr+=List.fill(index)(1)
      fulling(index+1)}
    else arr.remove(0)
         arr.toList
  }
  fulling()
}
}

Other:
object Kata {

  def pyramid(n: Int): List[List[Int]] =
    List.tabulate(n)(i => List.fill(i+1)(1))
}

object Kata {
  def pyramid(n: Int): List[List[Int]] = {
    (1 to n).map(List.fill(_)(1)).toList
  }
}