Initial data commit

Task/Sorting-algorithms-Quicksort/Elena/sorting-algorithms-quicksort.elena

@@ -0,0 +1,49 @@
+import extensions;
+import system'routines;
+import system'collections;
+
+extension op
+{
+    quickSort()
+    {
+        if (self.isEmpty()) { ^ self };
+
+        var pivot := self[0];
+
+        auto less := new ArrayList();
+        auto pivotList := new ArrayList();
+        auto more := new ArrayList();
+
+        self.forEach:(item)
+        {
+            if (item < pivot)
+            {
+                less.append(item)
+            }
+            else if (item > pivot)
+            {
+                more.append(item)
+            }
+            else
+            {
+                pivotList.append(item)
+            }
+        };
+
+        less := less.quickSort();
+        more := more.quickSort();
+
+        less.appendRange(pivotList);
+        less.appendRange(more);
+
+        ^ less
+    }
+}
+
+public program()
+{
+    var list := new int[]{3, 14, 1, 5, 9, 2, 6, 3};
+
+    console.printLine("before:", list.asEnumerable());
+    console.printLine("after :", list.quickSort().asEnumerable());
+}