Github user tillrohrmann commented on the pull request: https://github.com/apache/flink/pull/1220#issuecomment-146474169 A more scalaesque solution for the `partitionBox` method without using vars and for loops would be ``` def partitionBox(center: Vector, width: Vector): Seq[Vector] = { def partitionHelper(box: Seq[Vector], dim: Int): Seq[Vector] = { if (dim >= width.size) { box } else { val newBox = box.flatMap { vector => val (up, down) = (vector.copy, vector) up.update(dim, up(dim) - width(dim) / 4) down.update(dim, down(dim) + width(dim) / 4) Seq(up, down) } partitionHelper(newBox, dim + 1) } } partitionHelper(Seq(center), 0) } ```
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