diff --git a/assignments/array-methods.js b/assignments/array-methods.js
index f3862361e..275b5f7da 100644
--- a/assignments/array-methods.js
+++ b/assignments/array-methods.js
@@ -57,29 +57,33 @@ const runners = [
 
 // ==== Challenge 1: Use .forEach() ====
 // The event director needs both the first and last names of each runner for their running bibs. Combine both the first and last names and populate a new array called `fullNames`. This array will contain just strings.
-let fullNames = [];
+runners.forEach(runner => (runner.full_name = `${runner.first_name} ${runner.last_name}`));
+let fullNames = runners.map(runner => runner['full_name']);
 console.log(fullNames);
 
-// ==== Challenge 2: Use .map() ====
-// The event director needs to have all the runners' first names in uppercase because the director BECAME DRUNK WITH POWER. Populate an array called `firstNamesAllCaps`. This array will contain just strings.
-let firstNamesAllCaps = [];
+let firstNamesAllCaps = runners.map(runner => runner['first_name'].toUpperCase());
 console.log(firstNamesAllCaps);
 
 // ==== Challenge 3: Use .filter() ====
 // The large shirts won't be available for the event due to an ordering issue. We need a filtered version of the runners array, containing only those runners with large sized shirts so they can choose a different size. This will be an array of objects.
-let runnersLargeSizeShirt = [];
+let runnersLargeSizeShirt = runners.filter(runner => runner.shirt_size === 'L');
 console.log(runnersLargeSizeShirt);
 
 // ==== Challenge 4: Use .reduce() ====
 // The donations need to be tallied up and reported for tax purposes. Add up all the donations and save the total into a ticketPriceTotal variable.
-let ticketPriceTotal = 0;
+let donations = runners.map(runner => runner['donation']);
+let ticketPriceTotal = donations.reduce((total, donation) => total + donation);
 console.log(ticketPriceTotal);
 
 // ==== Challenge 5: Be Creative ====
 // Now that you have used .forEach(), .map(), .filter(), and .reduce().  I want you to think of potential problems you could solve given the data set and the 5k fun run theme.  Try to create and then solve 3 unique problems using one or many of the array methods listed above.
 
 // Problem 1
+// Samsumg changed their domain and now we need to correct all the emails for @samsung.com address to @sungsam.com
+runners.forEach(runner => (runner.email = runner.email.replace('@samsung.com', '@sungsam.com')));
+console.log(runners.filter(runner => runner.email.includes('sungsam')));
 
 // Problem 2
 
-// Problem 3
\ No newline at end of file
+
+// Problem 3
diff --git a/assignments/callbacks.js b/assignments/callbacks.js
index cb72e70c9..ba03fee40 100644
--- a/assignments/callbacks.js
+++ b/assignments/callbacks.js
@@ -41,29 +41,61 @@ const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'];
 
 function getLength(arr, cb) {
   // getLength passes the length of the array into the callback.
+  return cb(arr.length);
 }
 
+const testLen1 = getLength(items, length => `Array Length is ${length}`);
+console.log(testLen1);
+
+
 function last(arr, cb) {
   // last passes the last item of the array into the callback.
+  return cb(arr[arr.length - 1]);
 }
 
+const testLast = last(items, item => `Last item is ${item}`);
+console.log(testLast); //Gum
+
+//====================================================
 function sumNums(x, y, cb) {
   // sumNums adds two numbers (x, y) and passes the result to the callback.
+  return cb(x + y);
 }
 
+const testSum = sumNums(1, 8, sum => `Sum is ${sum}`);
+console.log(testSum); //9
+
+//====================================================
 function multiplyNums(x, y, cb) {
   // multiplyNums multiplies two numbers and passes the result to the callback.
+  return cb(x * y);
 }
 
+const testMult = multiplyNums(2, 8, product => `Product is ${product}`);
+console.log(testMult); //Product is 16
+
+//====================================================
 function contains(item, list, cb) {
   // contains checks if an item is present inside of the given array/list.
   // Pass true to the callback if it is, otherwise pass false.
+  return cb(list.includes(item));
 }
 
+const testContains = contains('Notebook', items, includes => `Item included: ${includes}`);
+console.log(testContains); //Item included: true
+
+const testContains2 = contains('Book', items, includes => `Item included: ${includes}`);
+console.log(testContains2); //Item included: false
+//====================================================
 /* STRETCH PROBLEM */
 
 function removeDuplicates(array, cb) {
   // removeDuplicates removes all duplicate values from the given array.
   // Pass the duplicate free array to the callback function.
   // Do not mutate the original array.
+  return cb(array.filter((item, index) => array.indexOf(item) === index));
 }
+
+const items_dup = [...items, ...items];
+const testRemoveDuplicates = removeDuplicates(items_dup, arr => console.log(arr));
+//['Pencil', 'Notebook', 'yo-yo', 'Gum'
\ No newline at end of file
diff --git a/assignments/closure.js b/assignments/closure.js
index 4b399c098..306ba8d6e 100644
--- a/assignments/closure.js
+++ b/assignments/closure.js
@@ -4,9 +4,16 @@
 // that manipulates variables defined in the outer scope.
 // The outer scope can be a parent function, or the top level of the script.
 
+const closure = () => {
+  let closureData = '';
+  return data => (closureData += data);
+};
 
-/* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */
+const mytestClosure = closure();
+console.log(mytestClosure('Hi!'));
+console.log(mytestClosure(" ...here we are again hi"));
 
+/* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */
 
 // ==== Challenge 2: Implement a "counter maker" function ====
 const counterMaker = () => {
@@ -16,18 +23,56 @@ const counterMaker = () => {
   //      NOTE: This `counter` function, being nested inside `counterMaker`,
   //      "closes over" the `count` variable. It can "see" it in the parent scope!
   // 3- Return the `counter` function.
+  let count = 1;
+  return () => {
+    return count++;
+  };
 };
+
 // Example usage: const myCounter = counterMaker();
 // myCounter(); // 1
 // myCounter(); // 2
+console.log('Counter V1');
+const mycounter = counterMaker();
+console.log(`This should be 1: ${mycounter()}`);
+console.log(`This should be 2: ${mycounter()}`);
 
 // ==== Challenge 3: Make `counterMaker` more sophisticated ====
 // It should have a `limit` parameter. Any counters we make with `counterMaker`
 // will refuse to go over the limit, and start back at 1.
+const counterMaker2 = (limit = 10) => {
+  let count = 1;
+  return () => {
+    return count > limit ? (count = 1) : count++;
+  };
+};
+
+console.log('Counter V2');
+const counterV2 = counterMaker2(2);
+console.log(`This should be 1: ${counterV2()}`);
+console.log(`This should be 2: ${counterV2()}`);
+console.log(`This should be 1: ${counterV2()}`);
 
 // ==== Challenge 4: Create a counter function with an object that can increment and decrement ====
-const counterFactory = () => {
+const counterFunction = (limit = 10) => {
   // Return an object that has two methods called `increment` and `decrement`.
   // `increment` should increment a counter variable in closure scope and return it.
   // `decrement` should decrement the counter variable and return it.
+  let count = 0;
+  return {
+    increment: () => {
+      count = count >= limit ? 1 : count + 1;
+      return count;
+    },
+    decrement: () => {
+      count = count >= limit ? 0 : count - 1;
+      return count;
+    },
+  };
 };
+
+console.log('Counter V3');
+const counterV3 = counterFunction();
+console.log(`This should be 1: ${counterV3.increment()}`);
+console.log(`This should be 2: ${counterV3.increment()}`);
+console.log(`This should be 1: ${counterV3.decrement()}`);
\ No newline at end of file