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@tabrez
Forked from lambda-hacker/zip.scala
Created Feb 10, 2015
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// zip3 Lists
object ZipUtils {
def zip3[A, B, C] (xs: List[A], ys: List[B], zs: List[C]) : List[(A, B, C)] = {
def zip3_aux(xs: List[A], ys: List[B], zs: List[C],
acc: List[(A, B, C)]) : List[(A, B, C)] = (xs, ys, zs) match {
case (xh :: xt, yh :: yt, zh :: zt) => zip3_aux (xt, yt, zt, (xh, yh, zh) :: acc )
case _ => acc.reverse
}
zip3_aux(xs, ys, zs, Nil)
}
def zipWith [A,B,C] (f: (A, B) => C) (xs: List[A], ys: List[B]) : List[C] = {
xs zip ys map { case (x, y) => f(x, y) }
}
// zip3 Vectors
def zip3[A, B, C] (xs: Vector[A], ys: Vector[B], zs: Vector[C]) : Vector[(A, B, C)] = {
val l = xs.length min ys.length min zs.length
def zipaux (v: Int, acc: Vector[(A, B, C)]) : Vector[(A, B, C)] =
if (v == 0) acc
else zipaux(v - 1, acc :+ ( xs(l - v), ys(l - v), zs(l - v) ))
zipaux (l, Vector.empty)
}
}
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