Short Levenshtein distance implementation in Scala

EditDistance.scala

package net.tixxit.levenshtein

import scala.math.min

object EditDistance {
  def editDist[A](a: Iterable[A], b: Iterable[A]) =
    ((0 to b.size).toList /: a)((prev, x) =>
      (prev zip prev.tail zip b).scanLeft(prev.head + 1) {
          case (h, ((d, v), y)) => min(min(h + 1, v + 1), d + (if (x == y) 0 else 1))
        }) last
}

Usage:
println(editDist("sam","sam"))