diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..bc9ca10f 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -9,12 +9,13 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+// Example 1 // console.log is returning undefined due to the "a" variable has not been assigned a value
+
 let a;
 console.log(a);
 
 
-// Example 2
+// Example 2 // console.log is returning undefined as "hello" has been assigned to the function sayHello() which does not have a return value
 function sayHello() {
     let message = "Hello";
 }
@@ -23,7 +24,8 @@ let hello = sayHello();
 console.log(hello);
 
 
-// Example 3
+// Example 3 //console.log is returning undefined as the parameter "user" has not been assigned a value
+
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
@@ -31,6 +33,8 @@ function sayHelloToUser(user) {
 sayHelloToUser();
 
 
-// Example 4
+// Example 4 // console.log is returning undefined as in JavaScript, arrays are zero-indexed with the first element of an array being 0,
+// the second element being 1 etc. In this example, there are three elements, however, the index ends at 2. Therefore, arr[3] returns
+// undefined as the index ends at 2.
 let arr = [1,2,3];
 console.log(arr[3]);
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..e1c86ff4 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,16 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+     let evenArr = [];
+  let index = 0;
+  while (n > evenArr.length) {
+    if (index % 2 === 0) {
+      evenArr.push(index);
+    }
+    index ++;
+    //console.log(evenArr);
+  }
+  console.log(evenArr);
 }
 
 evenNumbers(3); // should output 0,2,4
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..d49bb3b2 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,14 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    let index = 0;
+
+  while (index < birthdays.length) {
+    if (birthdays[index].includes("July")) {
+      return birthdays[index];
+    }
+    index ++;
+  }
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..0da3cde3 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,7 +7,14 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+   let sum = 0;
+  let index = 0;
+
+  do {
+    sum += index * 2;
+    index ++;
+  } while (index < n);
+  return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..3aee25aa 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,7 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
-    console.log(String.fromCharCode(97 + i));
-    i++;
+for (let i = 0; i <26; i++) {
+  console.log(String.fromCharCode(97 + i));
 }
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
index 081002b2..dc4cc9ae 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -26,7 +26,9 @@ const AGES = [
     49
 ];
 
-// TODO - Write for loop code here
+for (let index = 0; index < WRITERS.length; index ++) {
+  console.log(`${WRITERS[index]} is ${AGES[index]} years old`);
+}
 
 /*
 The output should look something like this:
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
index 65585c6a..98dbe375 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,12 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (let busStop of tubeStations) {
+  console.log(busStop);
+}
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let char of str) {
+  console.log(char.toUpperCase());
+}
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..2b28c708 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+   let arr = [];
+    for (const element of cities) {
+        if (temperatureService(element)) {
+           arr.push(`The temperature in ${element} is ${temperatureService(element)} degrees`);
+        } 
+    } return arr;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..9f0e5a4a 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,7 +10,17 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+    let index = 0;
+    let arr = [];
+    do {
+        arr.push(generateRandomNumber());        
+        if (arr[index] > 50) {
+            arr = arr[index];
+        }
+        index ++;
+    }
+    while (index <= arr.length);
+    return arr
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..9757e9f1 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,8 +5,12 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
-}
+      let arr = [];
+    for (const element of allArticleTitles) {
+        if (element.length <= 65) {
+            arr.push(element);
+        }
+    }return arr;
 
 /*
     The editor of the FT likes short headlines with only a few words!
@@ -14,7 +18,12 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+   const sortedArr = allArticleTitles.sort((a,b) => {
+        // console.log(a.split(" ").length);
+        return a.split(" ").length - b.split(" ").length;
+    });
+    return sortedArr[0];
+} 
 }
 
 /*
@@ -23,7 +32,12 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+   let array = []
+    for (const element of allArticleTitles){
+        if ( /\d/.test(element)) {
+            array.push(element);
+        }
+    } return array;
 }
 
 /*
@@ -31,8 +45,17 @@ function headlinesWithNumbers(allArticleTitles) {
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
-}
+    let arrNumOfCharacters = [];
+    let total = 0;
+    let average = 0;
+    for (const element of allArticleTitles) {
+        arrNumOfCharacters.push(element.trim().length);
+    }
+    for (const element of arrNumOfCharacters) {
+         total = total + element;
+    }
+     average = total / arrNumOfCharacters.length;
+     return Math.round(average);
 
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..85fa1d9c 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -34,7 +34,9 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+   const average = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS.map(prices => prices.reduce((a, b) => a + b) / prices.length);
+    // console.log(average)
+    return average.map(value => Number(value.toFixed(2)))
 }
 
 /*
@@ -48,7 +50,8 @@ function getAveragePrices(closingPricesForAllStocks) {
     The price change value should be rounded to 2 decimal places, and should be a number (not a string)
 */
 function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+    const priceChange = closingPricesForAllStocks.map(prices => prices[prices.length - 1] - prices[0]);
+    return priceChange.map((value) => Number(value.toFixed(2)));
 }
 
 /*
@@ -64,7 +67,10 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    const sortedArr = closingPricesForAllStocks.map(prices => prices.sort((a, b) => b - a));
+    return sortedArr.map((prices, index) => {
+        return `The highest price of ${STOCKS[index].toUpperCase()} in the last 5 days was ${prices[0].toFixed(2)}`;
+    })
 }
 
 
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
index 31f8052c..88cd69cb 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -8,9 +8,12 @@
     Using a loop, complete the function below so it returns the factorial of the number being passed in. 
 */
 
-function factorial(input) {
-    // TODO
-}
+function factorial(sum) {
+  let count = 1;
+    for (let index = sum; index >= 1; index --) {
+        count *= index;
+    }
+    return count  }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..33b3befd 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -11,7 +11,22 @@
 */
 
 function getHighestRatedInEachGenre(books) {
-    // TODO
+     let genreList = ["non-fiction", "children", "cooking"];
+    let maxRatingTitles = [];
+    for (const genre of genreList) {
+        let maxRating = 0;
+        let maxIndex = 0;
+        for (let i = 0; i < books.length; i++) {
+            if (books[i].genre === genre) {
+                if (books[i].rating > maxRating) {
+                    maxRating = books[i].rating;
+                    maxIndex = i;
+                }
+            }
+        }
+        maxRatingTitles.push(books[maxIndex].title);
+    }
+    return maxRatingTitles;
 }
 
 
diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
index 9ef9aec7..f8f4812f 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -14,7 +14,11 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+    let fibSeq = [0, 1];
+  for (let i = 0; n > fibSeq.length; i++) {
+    fibSeq.push(fibSeq[fibSeq.length - 1] + fibSeq[fibSeq.length - 2]);
+  }
+  return fibSeq;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */