moving all labs to old dir

old/lectures/lec5/p2/task3.js

@@ -0,0 +1,8 @@
+let arr = [12, 17, 12, 67, 23, 67, 8, 8, 9, 12, 8];
+
+let newArr = arr.filter(function (item, index) {
+    return arr.indexOf(item) === index;
+});
+
+alert(newArr);
+//12,17,67,23,8,9