Zippers

gistfile1.scala

scala> val z = zipper(Stream(9, 11), 7, Stream(23, 9))
z: scalaz.Zipper[Int] = <zipper>

scala> z.shows
res164: String = [11,9] 7 [23,9]

scala> val z0 = z.tryNext
z0: scalaz.Zipper[Int] = <zipper>

scala> z0.shows
res165: String = [11,9,7] 23 [9]

scala> val z1 = z0.insertLeft(11)
z1: scalaz.Zipper[Int] = <zipper>

scala> z1.shows
res166: String = [11,9,7] 11 [23,9]

scala> val z2 = z1.insertRight(89)
z2: scalaz.Zipper[Int] = <zipper>

scala> z2.shows
res167: String = [11,9,7,11] 89 [23,9]