feat: add topic6 -> left rotation by 1 element

Author: ExploitEngineer

Topic6/index.js

@@ -0,0 +1,8 @@
+// Left rotation by 1 element
+let arr1 = [1, 2, 3, 4, 5];
+let copy = arr1[0];
+for (let i = 0; i < arr1.length - 1; i++) {
+  arr1[i] = arr1[i + 1];
+}
+arr1[arr1.length - 1] = copy;
+console.log(arr1);