diff --git a/src/arrays.js b/src/arrays.js
index b995952..eb70e77 100644
--- a/src/arrays.js
+++ b/src/arrays.js
@@ -8,11 +8,19 @@ const each = (elements, cb) => {
   // Iterates over a list of elements, yielding each in turn to the `cb` function.
   // This only needs to work with arrays.
   // based off http://underscorejs.org/#each
+  for (let i = 0; i < elements.length; i++) {
+    cb(elements[i], i);
+  }
 };
 
 const map = (elements, cb) => {
   // Produces a new array of values by mapping each value in list through a transformation function (iteratee).
   // Return the new array.
+ const newArr = [];
+  for (let i = 0; i < elements.length; i++) {
+    newArr.push(cb(elements[i]));
+  }
+  return newArr;
 };
 
 const reduce = (elements, cb, memo = elements.shift()) => {