Data commit

Task/Spiral-matrix/Scala/spiral-matrix.scala

@@ -0,0 +1,22 @@
+class Folder(){
+  var dir = (1,0)
+  var pos = (-1,0)
+  def apply(l:List[Int], a:Array[Array[Int]]) = {
+    var (x,y) = pos  //start position
+    var (dx,dy) = dir //direction
+    l.foreach {e => x = x + dx; y = y + dy; a(y)(x) = e }  //copy l elements to array using current direction
+    pos = (x,y)
+    dir = (-dy, dx) //turn
+  }
+}
+def spiral(n:Int) = {
+  def dup(n:Int) = (1 to n).flatMap(i=>List(i,i)).toList
+  val folds = n :: dup(n-1).reverse  //define fold part lengths
+	
+  var array = new Array[Array[Int]](n,n)
+  val fold = new Folder()
+
+  var seq = (0 until n*n).toList  //sequence to fold
+  folds.foreach {len => fold(seq.take(len),array); seq = seq.drop(len)}
+  array
+}