diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..974fdd23 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -10,27 +10,25 @@
 */
 
 // Example 1
-let a;
+let a = 1;
 console.log(a);
 
-
 // Example 2
 function sayHello() {
-    let message = "Hello";
+  let message = "Hello";
+  return message;
 }
 
 let hello = sayHello();
 console.log(hello);
 
-
 // Example 3
 function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+  console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
-
+sayHelloToUser("some value");
 
 // Example 4
-let arr = [1,2,3];
-console.log(arr[3]);
+let arr = [1, 2, 3];
+console.log(arr);
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..c00b78fc 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -5,10 +5,33 @@
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
 
+// function evenNumbers(n) {
+//     // TODO
+
+//     while(n ){
+//         console.log();
+//     }
+// }
+
+//experiment
+
 function evenNumbers(n) {
-    // TODO
+  // TODO
+    let numArray = [0,1,2,3,4,5,6,7,8,9];
+    let counter = 0;
+    let stringVal = [];
+
+    while (counter<n) {
+        stringVal[counter] = numArray[counter] * 2;
+        counter++;
+        
+    }
+    
+    console.log(stringVal);
+
 }
 
+
 evenNumbers(3); // should output 0,2,4
 evenNumbers(0); // should output nothing
 evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..33ddffd7 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -18,6 +18,13 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+    let i = 0; 
+    while (i < birthdays.length) {
+        if (birthdays[i].includes("July")) {
+            return birthdays[i];
+         }
+        i++;
+     }
 }
 
 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..748ce2d8 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,9 +7,25 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+  // TODO
+    let numArray = [0,1,2,3,4,5,6,7,8,9,10];
+    let counter = 0;
+    let sum = 0;
+
+    do {
+        // if (numArray[counter] % 2 == 0) {
+            sum += counter * 2;
+            
+        // } else { 
+            
+        // }
+         counter++;
+
+     } while (counter < n);
+
+    return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
\ No newline at end of file
+console.log(evenNumbersSum(10)); // should output 90
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..a6f19419 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,9 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+// let i = 0;
+for (let i = 0; i < 26;i++) {
     console.log(String.fromCharCode(97 + i));
-    i++;
+    // 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..c5c1ebd7 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -28,6 +28,10 @@ const AGES = [
 
 // TODO - Write for loop code here
 
+for (let i = 0; i < WRITERS.length; i++) {
+    console.log(WRITERS[i] + " is " + AGES[i] + " 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..513dd394 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -10,7 +10,14 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
-
+for (let i = 0; i < tubeStations.length; i++) {
+    console.log(tubeStations[i]);
+ }
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+let newString = "";
+for (let i = 0; i < str.length; i++) {
+    newString = str[i].toUpperCase();
+    console.log(newString);
+ }
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..aaacf4c5 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -13,6 +13,13 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let tempArray = [];
+    for (let i = 0; i < cities.length; i++) { 
+      let temp = temperatureService(cities[i]);
+        // console.log(temp);
+        tempArray[i] = "The temperature in " + cities[i] + " is " + temp + " degrees";
+    }
+    return tempArray
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..f927803b 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,15 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let randomNumber = 0;
+
+    do {
+        randomNumber = generateRandomNumber();
+    }
+    while (randomNumber <= 50);
+           
+    return randomNumber;
+
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..37f149f6 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,6 +5,17 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
+
+    let newArray = [];
+    for (let i = 0; i < allArticleTitles.length;i++) { 
+
+        if (allArticleTitles[i].length <= 65) {
+            newArray.push(allArticleTitles[i]);
+         }
+        // console.log(newArray[i]);
+
+    }
+    return newArray;
     // TODO
 }
 
@@ -15,6 +26,19 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let spaceCounter = [];
+    let spaceCounterSize = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        spaceCounter.push(allArticleTitles[i].split(" "));
+        // console.log(spaceCounter);
+        spaceCounterSize.push(spaceCounter[i].length);
+    }
+    // console.log(spaceCounter);
+
+    // console.log(spaceCounterSize);
+    // console.log(Math.min.apply(Math,spaceCounterSize));
+
+    return allArticleTitles[spaceCounterSize.indexOf(Math.min.apply(Math,spaceCounterSize))];
 }
 
 /*
@@ -24,14 +48,30 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+
+    let newArray = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      if (/\d/.test(allArticleTitles[i])) {
+        newArray.push(allArticleTitles[i]);
+      }
+    }
+    // console.log(newArray);
+    return newArray;
 }
 
+// return /\d/.test(str);
+// /\d/.test(allArticleTitles[i]))
 /*
     The Financial Times wants to understand what the average number of characters in an article title is.
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let average = 0;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        average += allArticleTitles[i].length;
+    }
+    return parseInt(average / allArticleTitles.length);
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..37b85abe 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -11,11 +11,11 @@
 const STOCKS = ["aapl", "msft", "amzn", "googl", "tsla"];
 
 const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
-    [179.19, 180.33, 176.28, 175.64, 172.99], // AAPL
-    [340.69, 342.45, 334.69, 333.20, 327.29], // MSFT
-    [3384.44, 3393.39, 3421.37, 3420.74, 3408.34], // AMZN
-    [2951.88, 2958.13, 2938.33, 2928.30, 2869.45], // GOOGL
-    [1101.30, 1093.94, 1067.00, 1008.87, 938.53] // TSLA
+  [179.19, 180.33, 176.28, 175.64, 172.99], // AAPL
+  [340.69, 342.45, 334.69, 333.2, 327.29], // MSFT
+  [3384.44, 3393.39, 3421.37, 3420.74, 3408.34], // AMZN
+  [2951.88, 2958.13, 2938.33, 2928.3, 2869.45], // GOOGL
+  [1101.3, 1093.94, 1067.0, 1008.87, 938.53], // TSLA
 ];
 
 /*
@@ -34,7 +34,20 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  // TODO
+  let sum = 0;
+  let averageVal = 0;
+  let averagesArray = [];
+  for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+      sum += closingPricesForAllStocks[i][j];
+    }
+    averageVal = sum / closingPricesForAllStocks[i].length;
+    averagesArray.push(parseFloat(averageVal.toFixed(2)));
+    sum = 0;
+  }
+  console.log(averagesArray);
+  return averagesArray;
 }
 
 /*
@@ -48,7 +61,24 @@ 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
+  // TODO
+
+    let difference = 0;
+    let differenceArray = [];
+    
+
+
+  for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+        difference = closingPricesForAllStocks[i][closingPricesForAllStocks[i].length-1] - closingPricesForAllStocks[i][0];
+    }
+            console.log(difference);
+
+    differenceArray.push(parseFloat(difference.toFixed(2)));
+    difference = 0;
+  }
+  console.log(differenceArray);
+  return differenceArray;
 }
 
 /*
@@ -64,31 +94,42 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+  // TODO
+    
+    let highestValue = 0;
+    let highestValueArray = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+            highestValue = Math.max.apply(Math, closingPricesForAllStocks[i]);
+        }
+                 highestValueArray.push("The highest price of " + stocks[i].toUpperCase() + " in the last 5 days was " + highestValue.toFixed(2));
+   
+     }
+    console.log(highestValueArray);
+    return highestValueArray;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {
-    expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
-        [176.89, 335.66, 3405.66, 2929.22, 1041.93]
-    );
+  expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([
+    176.89, 335.66, 3405.66, 2929.22, 1041.93,
+  ]);
 });
 
 test("should return the price change for each stock", () => {
-    expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
-        [-6.2, -13.4, 23.9, -82.43, -162.77]
-    );
+  expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([
+    -6.2, -13.4, 23.9, -82.43, -162.77,
+  ]);
 });
 
 test("should return a description of the highest price for each stock", () => {
-    expect(highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS)).toEqual(
-        [
-            "The highest price of AAPL in the last 5 days was 180.33",
-            "The highest price of MSFT in the last 5 days was 342.45",
-            "The highest price of AMZN in the last 5 days was 3421.37",
-            "The highest price of GOOGL in the last 5 days was 2958.13",
-            "The highest price of TSLA in the last 5 days was 1101.30"
-        ]
-    );
+  expect(
+    highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS)
+  ).toEqual([
+    "The highest price of AAPL in the last 5 days was 180.33",
+    "The highest price of MSFT in the last 5 days was 342.45",
+    "The highest price of AMZN in the last 5 days was 3421.37",
+    "The highest price of GOOGL in the last 5 days was 2958.13",
+    "The highest price of TSLA in the last 5 days was 1101.30",
+  ]);
 });
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
index 31f8052c..c5e8c2e8 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -10,6 +10,11 @@
 
 function factorial(input) {
     // TODO
+    let factorial = 1;
+    for (let i = input; i > 0; i--) {
+        factorial *= i;
+    }
+    return factorial;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..8d99d600 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -11,72 +11,107 @@
 */
 
 function getHighestRatedInEachGenre(books) {
-    // TODO
-}
+  // TODO
+
+  let highestValueArray = [];
+  let genreChildrenArray = [];
+  let genreNonFictionArray = [];
+  let genreCookingArray = [];
+
+  // books.forEach(element => element.);
+
+  books.forEach((element) => {
+    if (element.genre === "children") {
+      genreChildrenArray.push(element);
+    } else if (element.genre == "cooking") {
+      genreCookingArray.push(element);
+    } else {
+      genreNonFictionArray.push(element);
+    }
+  });
+
+    genreChildrenArray.sort((r1, r2) => 
+        r1 < r2 ? 1 :  (r1.rating > r2.rating) ? -1 : 0
+    ); 
 
+    genreCookingArray.sort((r1, r2) =>
+      r1 < r2 ? 1 : r1.rating > r2.rating ? -1 : 0
+    ); 
+
+    genreNonFictionArray.sort((r1, r2) =>
+      r1 < r2 ? 1 : r1.rating > r2.rating ? -1 : 0
+    ); 
+
+    highestValueArray.push(genreChildrenArray[0].title);
+    highestValueArray.push(genreCookingArray[0].title);
+    highestValueArray.push(genreNonFictionArray[0].title);
+
+  console.log(highestValueArray);
+  return highestValueArray;
+}
 
 /* ======= Book data - DO NOT MODIFY ===== */
 const BOOKS = [
-    {
-        title: "The Lion, the Witch and the Wardrobe",
-        genre: "children",
-        rating: 4.7
-    },
-    {
-        title: "Sapiens: A Brief History of Humankind",
-        genre: "non-fiction",
-        rating: 4.7
-    },
-    {
-        title: "Nadiya's Fast Flavours",
-        genre: "cooking",
-        rating: 4.7
-    },
-    {
-        title: "Harry Potter and the Philosopher's Stone",
-        genre: "children",
-        rating: 4.8
-    },
-    {
-        title: "A Life on Our Planet",
-        genre: "non-fiction",
-        rating: 4.8
-    },
-    {
-        title: "Dishoom: The first ever cookbook from the much-loved Indian restaurant",
-        genre: "cooking",
-        rating: 4.85
-    },
-    {
-        title: "Gangsta Granny Strikes Again!",
-        genre: "children",
-        rating: 4.9
-    },
-    {
-        title: "Diary of a Wimpy Kid",
-        genre: "children",
-        rating: 4.6
-    },
-    {
-        title: "BOSH!: Simple recipes. Unbelievable results. All plants.",
-        genre: "cooking",
-        rating: 4.6
-    },
-    {
-        title: "The Book Your Dog Wishes You Would Read",
-        genre: "non-fiction",
-        rating: 4.85
-    },
-]
-
+  {
+    title: "The Lion, the Witch and the Wardrobe",
+    genre: "children",
+    rating: 4.7,
+  },
+  {
+    title: "Sapiens: A Brief History of Humankind",
+    genre: "non-fiction",
+    rating: 4.7,
+  },
+  {
+    title: "Nadiya's Fast Flavours",
+    genre: "cooking",
+    rating: 4.7,
+  },
+  {
+    title: "Harry Potter and the Philosopher's Stone",
+    genre: "children",
+    rating: 4.8,
+  },
+  {
+    title: "A Life on Our Planet",
+    genre: "non-fiction",
+    rating: 4.8,
+  },
+  {
+    title:
+      "Dishoom: The first ever cookbook from the much-loved Indian restaurant",
+    genre: "cooking",
+    rating: 4.85,
+  },
+  {
+    title: "Gangsta Granny Strikes Again!",
+    genre: "children",
+    rating: 4.9,
+  },
+  {
+    title: "Diary of a Wimpy Kid",
+    genre: "children",
+    rating: 4.6,
+  },
+  {
+    title: "BOSH!: Simple recipes. Unbelievable results. All plants.",
+    genre: "cooking",
+    rating: 4.6,
+  },
+  {
+    title: "The Book Your Dog Wishes You Would Read",
+    genre: "non-fiction",
+    rating: 4.85,
+  },
+];
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the highest rated book in each genre", () => {
-    expect(new Set(getHighestRatedInEachGenre(BOOKS))).toEqual(new Set(
-        [
-            "The Book Your Dog Wishes You Would Read",
-            "Gangsta Granny Strikes Again!",
-            "Dishoom: The first ever cookbook from the much-loved Indian restaurant"
-        ]
-    ));
-});
\ No newline at end of file
+  expect(new Set(getHighestRatedInEachGenre(BOOKS))).toEqual(
+    new Set([
+      "The Book Your Dog Wishes You Would Read",
+      "Gangsta Granny Strikes Again!",
+      "Dishoom: The first ever cookbook from the much-loved Indian restaurant",
+    ])
+  );
+});
diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
index 9ef9aec7..b4a7340a 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -15,6 +15,17 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+    let fibonacciNumber = 0;
+    let fibonacciArray = [0,1];
+    for (let i = 1; i < n; i++) {
+        fibonacciNumber = (fibonacciArray[i] + fibonacciArray[i - 1]);
+        fibonacciArray.push(fibonacciNumber);
+        
+
+    }
+    // console.log(fibonacciArray);
+    fibonacciArray.pop();
+    return fibonacciArray;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */