diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..a3d06ede 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -10,12 +10,12 @@
 */
 
 // Example 1
-let a;
+let a; // there is no value has been added to a therefore a is undefined. 
 console.log(a);
 
 
 // Example 2
-function sayHello() {
+function sayHello() { // there is no parameter passed to the function's argument. 
     let message = "Hello";
 }
 
@@ -28,9 +28,9 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser(); // again there is no value been passed when calling the function. it should look like sayHelloToUser(value);
 
 
 // Example 4
-let arr = [1,2,3];
-console.log(arr[3]);
+let arr = [1,2,3]; 
+console.log(arr[3]); // there are only 2 elements in this array (starting from 0), so the output will be undefined. 
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..8e810d3a 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -5,10 +5,18 @@
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
 
+const evenArray = [];
+
 function evenNumbers(n) {
-    // TODO
+  let i = 0;
+  while (evenArray.length < n) {
+    evenArray.push(i);
+    i += 2;
+  }
+
+  console.log(evenArray.toString());
 }
 
-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
+// evenNumbers(3); // should output 0,2,4
+// evenNumbers(0); // should output nothing
+evenNumbers(20); // 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..e7d5661d 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,10 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+//    let i = 0; 
+//    while (i < BIRTHDAYS.length){
+    return BIRTHDAYS.find(BIRTHDAYS => BIRTHDAYS === "July 11th"); 
+//    } // TODO
 }
 
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+console.log(findFirstJulyBDay(BIRTHDAYS.toString())); // should output "July 11th"
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..6c613fbc 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -5,11 +5,24 @@
     
     Using a do-while loop, write a function which returns the sum of the first n even numbers (starting from 0)
 */
-
+let i = 0;
+let total = 0; 
+const evenArray = [];
+// let sum = 0;
 function evenNumbersSum(n) {
-    // TODO
+ 
+  do {
+    if (i%2 === 0){
+      evenArray.push(i);
+      total = total + i; 
+    }
+   i++; 
+    
+  } while (evenArray.length < n);
+
+  return total; 
 }
 
-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(3)); // should output 6
+console.log(evenNumbersSum(10)); // should output 0
+// 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..61227311 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..919ae992 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -11,23 +11,20 @@
 */
 
 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 < AGES.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..0154ec0f 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,16 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (const eachStation of tubeStations){
+    console.log(eachStation); 
+}
+
+
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (element of str){
+    console.log(element.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..00d9160d 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let tempReport = []; 
+    for (let city of cities){
+        let temp = temperatureService(city); 
+        tempReport.push(`The temperature in ${city} is ${temp} degrees`); 
+    }
+    return tempReport; 
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..7162ada0 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,7 +10,13 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+   let generateNum; 
+
+   do{
+    generateNum = generateRandomNumber();
+   }
+   while(generateNum <= 50); 
+   return generateNum; 
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..534f4c2d 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,7 +5,12 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let articleArr = []; 
+    for (const element of allArticleTitles) {
+        if (element.length <= 65){ 
+            articleArr.push(element); 
+        }
+        return articleArr; 
 }
 
 /*
@@ -14,7 +19,8 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let fewestWords = (a, b) => a.length <= b.length ? a : b; 
+    return allArticleTitles.reduce(fewestWords); 
 }
 
 /*
@@ -22,16 +28,40 @@ 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 checkTitleContainNum(title){
+    for(let character of title){
+        if(character >= '0' && character <= '9'){
+            return true; 
+        }
+        else {
+            return false; 
+        }
+    }
+}
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+   let articleWNum = []; 
+
+   for (let title of allArticleTitles){
+    if(checkTitleContainNum(title)){
+        articleWNum.push(title); 
+    }
+   }
+   return articleWNum; 
 }
 
+
 /*
     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 totalChar = 0; 
+
+    for(let title of allArticleTitles){
+        totalChar += title.length; 
+    }
+    return Math.round(totalChar / allArticleTitles.length); 
 }
 
 
@@ -79,3 +109,4 @@ test("should only return headlines containing numbers", () => {
 test("should return the average number of characters in a headline", () => {
     expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
 });
+
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..4e42c9af 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -34,7 +34,27 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  let averages = [];
+
+  for (let pricesForStock of closingPricesForAllStocks) {
+    averages.push(getAveragePricesForStock(pricesForStock));
+  }
+
+  return averages;
+}
+
+function getAveragePricesForStock(pricesForStock) {
+  let total = 0;
+
+  for (let price of pricesForStock) {
+    total += price;
+  }
+
+  return roundTo2Decimals(total / pricesForStock.length);
+}
+
+function roundTo2Decimals(num) {
+  return Math.round(num * 100) / 100;
 }
 
 /*
@@ -48,7 +68,19 @@ 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
+  let changes = [];
+
+  for (let pricesForStock of closingPricesForAllStocks) {
+    changes.push(getPriceChangeForStock(pricesForStock));
+  }
+
+  return changes;
+}
+
+function getPriceChangeForStock(pricesForStock) {
+  let priceChange =
+    pricesForStock[pricesForStock.length - 1] - pricesForStock[0];
+  return roundTo2Decimals(priceChange);
 }
 
 /*
@@ -64,9 +96,41 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let descriptions = [];
+
+    for(let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let highestPrice = getHighestPrice(closingPricesForAllStocks[i]);
+        descriptions.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPrice.toFixed(2)}`);
+    }
+
+    return descriptions;
 }
 
+function getHighestPrice(pricesForStock) {
+    
+    let highestPriceSoFar = 0;
+
+    for(let price of pricesForStock) {
+       
+        if(price > highestPriceSoFar) {
+            highestPriceSoFar = price;
+        }
+    }
+
+    return highestPriceSoFar;
+}
+
+function highestPriceDescriptionsAlternate(closingPricesForAllStocks, stocks) {
+    let descriptions = [];
+
+    for(let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let highestPrice = Math.max(...closingPricesForAllStocks[i]);
+        descriptions.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPrice.toFixed(2)}`);
+    }
+
+    return descriptions;
+
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {