diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..5a1b90eb 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,25 +12,32 @@
 // Example 1
 let a;
 console.log(a);
-
+// a has been declared by no value has been assigned.
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+  let message = "Hello";
 }
 
 let hello = sayHello();
 console.log(hello);
-
+// function sayHello has been declared by no value returned from the function
+// hello has been assigned the function sayHello which does not return anything
+// There is nothing for console.log to output so response is undefined.
 
 // Example 3
 function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+  console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+// function sayHelloToUser is being called without an argument
+// sayHelloToUser expects an argument so will output undefined in the logged response
+// for variable 'user' after outputting 'Hello '
 
 // Example 4
-let arr = [1,2,3];
+let arr = [1, 2, 3];
 console.log(arr[3]);
+
+// there are only 3 entries ranging from [0] to [2] in the array 'arr'
+// arr [3] doesn't have a value (because it's the 4th array element) so will show undefined.
diff --git a/1-exercises/B-array-literals/exercise.js b/1-exercises/B-array-literals/exercise.js
index 51eba5cc..c0d61235 100644
--- a/1-exercises/B-array-literals/exercise.js
+++ b/1-exercises/B-array-literals/exercise.js
@@ -5,8 +5,12 @@
 */
 
 let numbers = []; // add numbers from 1 to 10 into this array
-let mentors; // Create an array with the names of the mentors: Daniel, Irina and Rares
-
+for (let i = 0; i < 10; i++) {
+  numbers.push(i);
+}
+let mentors = []; // Create an array with the names of the mentors: Daniel, Irina and Rares
+let names = ["Daniel", "Irina", "Rares"];
+mentors.push(...names);
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */
diff --git a/1-exercises/C-array-get-set/exercise.js b/1-exercises/C-array-get-set/exercise.js
index 5ca911d5..9c1d01d7 100644
--- a/1-exercises/C-array-get-set/exercise.js
+++ b/1-exercises/C-array-get-set/exercise.js
@@ -5,11 +5,11 @@
 */
 
 function first(arr) {
-  return; // complete this statement
+  return arr[0]; // complete this statement
 }
 
 function last(arr) {
-  return; // complete this statement
+  return arr[arr.length - 1]; // complete this statement
 }
 
 /* 
diff --git a/1-exercises/C-array-get-set/exercises2.js b/1-exercises/C-array-get-set/exercises2.js
index 6b6b007a..39d0bf74 100644
--- a/1-exercises/C-array-get-set/exercises2.js
+++ b/1-exercises/C-array-get-set/exercises2.js
@@ -7,6 +7,8 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
+numbers.push(4);
+numbers[0] = 2;
 
 /* 
   DO NOT EDIT BELOW THIS LINE
diff --git a/1-exercises/D-for-loop/exercise.js b/1-exercises/D-for-loop/exercise.js
index 081002b2..cf702908 100644
--- a/1-exercises/D-for-loop/exercise.js
+++ b/1-exercises/D-for-loop/exercise.js
@@ -11,22 +11,19 @@
 */
 
 const WRITERS = [
-    "Virginia Woolf",
-    "Zadie Smith",
-    "Jane Austen",
-    "Bell Hooks",
-    "Yukiko Motoya"
-]
-
-const AGES = [
-    59,
-    40,
-    41,
-    63,
-    49
+  "Virginia Woolf",
+  "Zadie Smith",
+  "Jane Austen",
+  "Bell Hooks",
+  "Yukiko Motoya",
 ];
 
+const AGES = [59, 40, 41, 63, 49];
+
 // 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/E-while-loop-with-array/exercise.js b/1-exercises/E-while-loop-with-array/exercise.js
index d584cd75..b74d92d2 100644
--- a/1-exercises/E-while-loop-with-array/exercise.js
+++ b/1-exercises/E-while-loop-with-array/exercise.js
@@ -5,19 +5,30 @@
 */
 
 const BIRTHDAYS = [
-    "January 7th",
-    "February 12th",
-    "April 3rd",
-    "April 5th",
-    "May 3rd",
-    "July 11th",
-    "July 17th",
-    "September 28th",
-    "November 15th"
+  "January 7th",
+  "February 12th",
+  "April 3rd",
+  "April 5th",
+  "May 3rd",
+  "July 11th",
+  "July 17th",
+  "September 28th",
+  "November 15th",
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+  // TODO
+  //   for (let i = 0; i < BIRTHDAYS.length; i++) {
+  //     if (BIRTHDAYS[i].includes("July")) {
+  //       return BIRTHDAYS[i];
+  //     }
+  //   }
+
+  for (let birthday of BIRTHDAYS) {
+    if (birthday.includes("July")) {
+      return birthday;
+    }
+  }
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..f7a0e1b3 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -2,7 +2,7 @@
     Imagine we're making a weather app!
     
     We have a list of cities that the user wants to track.
-    We also already have a temperatureService function which will take a city as a parameter and return a temparature.
+    We also already have a temperatureService function which will take a city as a parameter and return a temperature.
 
     Implement the function below:
         - take the array of cities as a parameter
@@ -12,52 +12,50 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+  const weatherInCities = [];
+  for (const city of cities) {
+    let cityTemperature = temperatureService(city);
+    let cityStatement = `The temperature in ${city} is ${cityTemperature} degrees`;
+    weatherInCities.push(cityStatement);
+  }
+  return weatherInCities;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {
-    let temparatureMap  = new Map();
-
-    temparatureMap.set('London', 10);
-    temparatureMap.set('Paris', 12);
-    temparatureMap.set('Barcelona', 17);
-    temparatureMap.set('Dubai', 27);
-    temparatureMap.set('Mumbai', 29);
-    temparatureMap.set('São Paulo', 23);
-    temparatureMap.set('Lagos', 33);
-    
-    return temparatureMap.get(city);
+  let temparatureMap = new Map();
+
+  temparatureMap.set("London", 10);
+  temparatureMap.set("Paris", 12);
+  temparatureMap.set("Barcelona", 17);
+  temparatureMap.set("Dubai", 27);
+  temparatureMap.set("Mumbai", 29);
+  temparatureMap.set("São Paulo", 23);
+  temparatureMap.set("Lagos", 33);
+
+  return temparatureMap.get(city);
 }
 
 test("should return a temperature report for the user's cities", () => {
-    let usersCities = [
-        "London",
-        "Paris",
-        "São Paulo"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in London is 10 degrees",
-        "The temperature in Paris is 12 degrees",
-        "The temperature in São Paulo is 23 degrees"
-    ]);
+  let usersCities = ["London", "Paris", "São Paulo"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in London is 10 degrees",
+    "The temperature in Paris is 12 degrees",
+    "The temperature in São Paulo is 23 degrees",
+  ]);
 });
 
 test("should return a temperature report for the user's cities (alternate input)", () => {
-    let usersCities = [
-        "Barcelona",
-        "Dubai"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in Barcelona is 17 degrees",
-        "The temperature in Dubai is 27 degrees"
-    ]);
+  let usersCities = ["Barcelona", "Dubai"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in Barcelona is 17 degrees",
+    "The temperature in Dubai is 27 degrees",
+  ]);
 });
 
 test("should return an empty array if the user hasn't selected any cities", () => {
-    expect(getTemperatureReport([])).toEqual([]);
-});
\ No newline at end of file
+  expect(getTemperatureReport([])).toEqual([]);
+});
diff --git a/2-mandatory/2-financial-times.js b/2-mandatory/2-financial-times.js
index 2ce6fb73..fa7c5ef1 100644
--- a/2-mandatory/2-financial-times.js
+++ b/2-mandatory/2-financial-times.js
@@ -5,16 +5,39 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+  const charLimit = 65;
+  const articlesUnderLimit = [];
+
+  for (const articleTitle of allArticleTitles) {
+    if (articleTitle.length <= charLimit) {
+      articlesUnderLimit.push(articleTitle);
+    }
+  }
+  return articlesUnderLimit;
 }
 
 /*
     The editor of the FT likes short headlines with only a few words!
     Implement the function below, which returns the title with the fewest words.
-    (you can assume words will always be seperated by a space)
+    (you can assume words will always be separated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+  // TODO
+  let shortestTitle = "";
+  let shortestSpaceCount = 0;
+  for (const title of allArticleTitles) {
+    if (shortestTitle === "") {
+      shortestTitle = title;
+      shortestSpaceCount = title.split(" ").length - 1;
+    } else {
+      let currentSpaceCount = title.split(" ").length - 1;
+      if (currentSpaceCount < shortestSpaceCount) {
+        shortestTitle = title;
+        shortestSpaceCount = currentSpaceCount;
+      }
+    }
+  }
+  return shortestTitle;
 }
 
 /*
@@ -22,8 +45,19 @@ function titleWithFewestWords(allArticleTitles) {
     Implement the function below to return a new array containing all the headlines which contain a number.
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
+
+function containsNumbers(str) {
+  return /[0-9]/.test(str);
+}
+
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+  let numberArticles = [];
+  for (const title of allArticleTitles) {
+    if (containsNumbers(title)) {
+      numberArticles.push(title);
+    }
+  }
+  return numberArticles;
 }
 
 /*
@@ -31,51 +65,62 @@ function headlinesWithNumbers(allArticleTitles) {
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+  // TODO
+  let charCount = 0;
+  const articleTitleCount = allArticleTitles.length;
+  for (const articleTitle of allArticleTitles) {
+    charCount += articleTitle.length;
+  }
+  const averageCharCount = Math.round(charCount / articleTitleCount);
+  return averageCharCount;
 }
 
-
-
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [
-    "Streaming wars drive media groups to spend more than $100bn on new content",
-    "Amazon Prime Video India country head: streaming is driving a TV revolution",
-    "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights",
-    "British companies look to muscle in on US retail investing boom",
-    "Libor to take firm step towards oblivion on New Year's Day",
-    "Audit profession unattractive to new recruits, says PwC boss",
-    "Chinese social media users blast Elon Musk over near miss in space",
-    "Companies raise over $12tn in 'blockbuster' year for global capital markets",
-    "The three questions that dominate investment",
-    "Brussels urges Chile's incoming president to endorse EU trade deal",
+  "Streaming wars drive media groups to spend more than $100bn on new content",
+  "Amazon Prime Video India country head: streaming is driving a TV revolution",
+  "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights",
+  "British companies look to muscle in on US retail investing boom",
+  "Libor to take firm step towards oblivion on New Year's Day",
+  "Audit profession unattractive to new recruits, says PwC boss",
+  "Chinese social media users blast Elon Musk over near miss in space",
+  "Companies raise over $12tn in 'blockbuster' year for global capital markets",
+  "The three questions that dominate investment",
+  "Brussels urges Chile's incoming president to endorse EU trade deal",
 ];
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("should only return potential headlines", () => {
-    expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(new Set([
-        "British companies look to muscle in on US retail investing boom",
-        "Libor to take firm step towards oblivion on New Year's Day",
-        "Audit profession unattractive to new recruits, says PwC boss",
-        "The three questions that dominate investment"
-    ]));
+  expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(
+    new Set([
+      "British companies look to muscle in on US retail investing boom",
+      "Libor to take firm step towards oblivion on New Year's Day",
+      "Audit profession unattractive to new recruits, says PwC boss",
+      "The three questions that dominate investment",
+    ])
+  );
 });
 
 test("should return an empty array for empty input", () => {
-    expect(potentialHeadlines([])).toEqual([]);
+  expect(potentialHeadlines([])).toEqual([]);
 });
 
 test("should return the title with the fewest words", () => {
-    expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual("The three questions that dominate investment");
+  expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual(
+    "The three questions that dominate investment"
+  );
 });
 
 test("should only return headlines containing numbers", () => {
-    expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual(new Set([
-        "Streaming wars drive media groups to spend more than $100bn on new content",
-        "Companies raise over $12tn in 'blockbuster' year for global capital markets"
-    ]));
+  expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual(
+    new Set([
+      "Streaming wars drive media groups to spend more than $100bn on new content",
+      "Companies raise over $12tn in 'blockbuster' year for global capital markets",
+    ])
+  );
 });
 
 test("should return the average number of characters in a headline", () => {
-    expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
+  expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
 });
diff --git a/2-mandatory/3-stocks.js b/2-mandatory/3-stocks.js
index 72d62f94..64821442 100644
--- a/2-mandatory/3-stocks.js
+++ b/2-mandatory/3-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 +34,18 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  let stockAveragePrices = [];
+  for (const companyPrices of closingPricesForAllStocks) {
+    const daysCount = companyPrices.length;
+    let companyPriceTotal = 0;
+    for (const singlePrice of companyPrices) {
+      companyPriceTotal += singlePrice;
+    }
+    const averageStockPrice =
+      Math.round((companyPriceTotal / daysCount) * 100) / 100;
+    stockAveragePrices.push(averageStockPrice);
+  }
+  return stockAveragePrices;
 }
 
 /*
@@ -48,7 +59,17 @@ 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
+  const stockPriceDifferences = [];
+  for (const companyPrices of closingPricesForAllStocks) {
+    const firstPricePosition = 0;
+    const lastPricePosition = companyPrices.length - 1;
+    const stockPriceDiff =
+      companyPrices[lastPricePosition] - companyPrices[firstPricePosition];
+    const stockPriceDiffRounded = Math.round(stockPriceDiff * 100) / 100;
+    stockPriceDifferences.push(stockPriceDiffRounded);
+  }
+  return stockPriceDifferences;
 }
 
 /*
@@ -64,31 +85,48 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+  // TODO
+  const highestStockPrices = [];
+  let stockCounter = 0;
+  for (const companyPrices of closingPricesForAllStocks) {
+    let highestPrice = 0;
+    for (const singlePrice of companyPrices) {
+      if (singlePrice > highestPrice) {
+        highestPrice = singlePrice;
+      }
+    }
+    let highestPriceRounded = Math.round(highestPrice * 100) / 100;
+    let stockUpperCase = stocks[stockCounter].toUpperCase();
+    stockCounter++;
+    let highestPriceEntry = `The highest price of ${stockUpperCase} in the last 5 days was ${highestPriceRounded.toFixed(
+      2
+    )}`;
+    highestStockPrices.push(highestPriceEntry);
+  }
+  return highestStockPrices;
 }
 
-
 /* ======= 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-radio-stations.js b/3-extra/1-radio-stations.js
index 577076e9..4b9e4f18 100644
--- a/3-extra/1-radio-stations.js
+++ b/3-extra/1-radio-stations.js
@@ -14,7 +14,13 @@
  */
 
 // `getAllFrequencies` goes here
-
+function getAllFrequencies() {
+  let frequencies = [];
+  for (let i = 87; i <= 108; i++) {
+    frequencies.push(i);
+  }
+  return frequencies;
+}
 /**
  * Next, let's write a function that gives us only the frequencies that are radio stations.
  * Call this function `getStations`.
@@ -25,7 +31,16 @@
  * - Return only the frequencies that are radio stations.
  */
 // `getStations` goes here
-
+function getStations() {
+  const allFrequencies = getAllFrequencies();
+  const onlyRadioFrequencies = [];
+  for (const frequency of allFrequencies) {
+    if (isRadioStation(frequency)) {
+      onlyRadioFrequencies.push(frequency);
+    }
+  }
+  return onlyRadioFrequencies;
+}
 /*
  * ======= TESTS - DO NOT MODIFY =======
  * Note: You are not expected to understand everything below this comment!
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..ef49a93b 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -9,74 +9,104 @@
     Implement a function which takes the array of books as a parameter, and returns an array of book titles.
     Each title in the resulting array should be the highest rated book in its genre.
 */
+let highestBooks = [];
+let highBook = {};
+let finalList = [];
 
-function getHighestRatedInEachGenre(books) {
-    // TODO
+function checkGenreListing(genreToCheck) {
+  for (let i = 0; i < highestBooks.length; i++) {
+    if (highestBooks[i].genre === genreToCheck) {
+      return i;
+    }
+  }
+  return -1;
 }
 
+function getHighestRatedInEachGenre(books) {
+  for (let i = 0; i < books.length; i++) {
+    let positioning = checkGenreListing(books[i].genre);
+    if (positioning >= 0) {
+      if (books[i].rating > highestBooks[positioning].rating) {
+        highestBooks[positioning].title = books[i].title;
+        highestBooks[positioning].rating = books[i].rating;
+      }
+    } else {
+      highBook.title = books[i].title;
+      highBook.genre = books[i].genre;
+      highBook.rating = books[i].rating;
+
+      highestBooks.push(highBook);
+      highBook = {};
+    }
+  }
+  for (let i = 0; i < highestBooks.length; i++) {
+    finalList.push(highestBooks[i].title);
+  }
+  return finalList;
+}
 
 /* ======= 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..6e118ff3 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -14,24 +14,28 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+  // TODO
+  const fiboList = [0, 1];
+  for (let i = 2; i < n; i++) {
+    let nextNum = fiboList[i - 2] + fiboList[i - 1];
+    fiboList.push(nextNum);
+  }
+  return fiboList;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the first 10 numbers in the Fibonacci Sequence", () => {
-    expect(generateFibonacciSequence(10)).toEqual(
-        [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
-    );
+  expect(generateFibonacciSequence(10)).toEqual([
+    0, 1, 1, 2, 3, 5, 8, 13, 21, 34,
+  ]);
 });
 
 test("should return the first 5 numbers in the Fibonacci Sequence", () => {
-    expect(generateFibonacciSequence(5)).toEqual(
-        [0, 1, 1, 2, 3]
-    );
+  expect(generateFibonacciSequence(5)).toEqual([0, 1, 1, 2, 3]);
 });
 
 test("should return the first 15 numbers in the Fibonacci Sequence", () => {
-    expect(generateFibonacciSequence(15)).toEqual(
-        [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377]
-    );
-});
\ No newline at end of file
+  expect(generateFibonacciSequence(15)).toEqual([
+    0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,
+  ]);
+});