diff --git a/starter-code/src/functions-and-arrays.js b/starter-code/src/functions-and-arrays.js
index 720d3dcf5..5d73cc596 100644
--- a/starter-code/src/functions-and-arrays.js
+++ b/starter-code/src/functions-and-arrays.js
@@ -1,19 +1,107 @@
 // Iteration #1: Find the maximum
+function maxOfTwoNumbers(num1, num2){
+  if (num1 > num2) {
+    return num1;
+  } else if (num2 > num1){
+    return num2;
+  } else
+    return num1;
+    return num2;
+}
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
+function findLongestWord (array){
+  if (array.length === 0){
+    return null;
+  } else if (array.length > 0) {
+      var longestWord = "";
+      array.forEach(function(word){
+        if (word.length > longestWord.length) {
+        longestWord = word;
+        return longestWord;
+    }
+    });
+    return longestWord;
+  }
+}
+
+
 // Iteration #3: Calculate the sum
 
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
+function sumNumbers (array){
+  sum = 0;
+  for (var i = 0; i < array.length; i++){
+    sum += array[i]
+  }
+  return sum
+}
+
+function sum (array){
+  if (array.length === 0){
+    return 0;
+  } else if (array.length == 1) {
+    return array [i];
+  } else if (array.length > 1){
+    var totalSum = 0;
+    for (let i = 0; i < array.length; i++){
+      switch (typeof(array[i])){
+        case "boolean":
+          if (array[i]){
+            totalSum++;
+          }
+        case "string":
+          totalSum += array[i].length;
+          break;
+        case "number":
+          totalSum += array[i];
+          break;
+        default:
+          throw new Error(); 
+      }
+    }
+  }
+  return totalSum;
+}
+
 // Iteration #4: Calculate the average
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
+function averageNumbers(array){
+  if (array.length === 0){
+    return null;
+  } else {
+    average = sumNumbers(array) / array.length;
+    return average;
+  }
+}
+
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
+function averageWordLength (array){
+  if (array.length === 0){
+    return null;
+  } else {
+    average = array.join('').length / array.length
+    return average;
+  }
+}
+
+function avg (array){
+  if (array.length === 0){
+    return null;
+  } else {
+    average = (sum(array) / array.length);
+    return average;
+  }
+}
+
+
 // Iteration #5: Unique arrays
 const wordsUnique = [
   'crab',
@@ -29,9 +117,33 @@ const wordsUnique = [
   'bring'
 ];
 
+
+function uniquifyArray (array){
+  if (array.length === 0){
+    return null;
+  } else {
+    return array.filter((a,b) => array.indexOf(a) === b)
+  }
+}
+
+console.log(uniquifyArray(words));
+
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
+
+function doesWordExist (array, word){
+  if (array.length === 0){
+    return null;
+  } else {
+    if (array.includes(word) === true){
+      return true;
+    } else {
+      return false;
+    }
+  }
+}
+
 // Iteration #7: Count repetition
 const wordsCount = [
   'machine',
@@ -47,6 +159,18 @@ const wordsCount = [
   'matter'
 ];
 
+
+function howManyTimes (array, word){
+  if (array.length === 0){
+    return 0;
+  } else {
+    var count = 0;
+    array.forEach((value) => (value === word && count++)
+    );
+    return count;
+  }
+}
+
 // Iteration #8: Bonus
 
 const matrix = [
@@ -71,3 +195,4 @@ const matrix = [
   [20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54],
   [1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]
 ];
+