refactor and stretch exercise completed.

Author: Dan2Clouted

Sprint-1/refactor/includes.js

@@ -1,8 +1,7 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+  for (const element of list) {
     if (element === target) {
       return true;
     }

Sprint-1/stretch/aoc-2018-day1/solution.js

@@ -0,0 +1,3 @@
+function sum(list) {
+  return list.reduce((a, b) => a + b, 0);
+}