diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..d20baa2a 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,7 +12,7 @@
 // Example 1
 let a;
 console.log(a);
-
+/* we didn't assign any value for our variable */
 
 // Example 2
 function sayHello() {
@@ -21,6 +21,7 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
+/* there is no parameter in our function */
 
 
 // Example 3
@@ -29,8 +30,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
-
+/* we didn't give any value to our parameter in function  */
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+/* there is no index number 3 in this array we have only 0,1,2 */ 
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..d6581b72 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+  let number = 0;
+  let arr = [];
+  while (n > 0) {
+    arr.push(number);
+    number += 2;
+    n--;
+  }
+  arr = arr.join(",");
+  console.log(arr);
 }
 
 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..e87b0ffa 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 currentIndex = 0;
+    while (currentIndex < birthdays.length) {
+      if (birthdays[currentIndex].includes("July")) {
+        return birthdays[currentIndex];
+      }
+      currentIndex++;
+    }
 }
 
 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..dc716da3 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -8,6 +8,14 @@
 
 function evenNumbersSum(n) {
     // TODO
+     let number = 0;
+     let total = 0;
+     do {
+       total += number;
+       number += 2;
+       n--;
+     } while (n > 0);
+     return total;
 }
 
 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..25c05c09 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,12 @@
 
 
 // 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++;
-}
+// let i = 0;
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
 // The output shouldn't change.
+for (i = 0; i < 26; i++) {
+    console.log(String.fromCharCode(97 + i));
+}
\ No newline at end of file
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
index 081002b2..2002a071 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,6 +27,9 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for (i = 0; i <= 5; 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..af6db988 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -4,13 +4,20 @@
 
 // TODO Use a for-of loop to output each of the tube stations below.
 let tubeStations = [
-    "Aldgate",
-    "Baker Street",
-    "Picadilly Circus",
-    "Oxford Street",
-    "Tottenham Court Road"
+  "Aldgate",
+  "Baker Street",
+  "Picadilly Circus",
+  "Oxford Street",
+  "Tottenham Court Road",
 ];
 
+for (let el of tubeStations) {
+  console.log(el);
+}
 
 // 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())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..1effe46c 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+  // TODO
+  let result = [];
+  for (let i = 0; i < cities.length; i++) {
+      result.push(`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`);
+  }
+  return result;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..2b48cf56 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,11 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let number = generateRandomNumber();
+    do {
+      number = generateRandomNumber();
+    } while (number < 50);
+    return number;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..bbde457a 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -6,15 +6,36 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+   return allArticleTitles.filter(items => items.length <= 65);
+// let headlines = [];
+
+//     for(let title of allArticleTitles) {
+//         if(title.length <= 65) {
+//             headlines.push(title);
+//         }
+//     }
+
+//     return headlines;
 }
 
+
 /*
     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)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    //TODO
+    let arr = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      arr.push(allArticleTitles[i].split(" ").length);
+    }
+    // return allArticleTitles[arr.indexOf(Math.min(...arr))];
+    const fewestWords = Math.min(...arr);
+    const indexOfArticle = arr.indexOf(fewestWords);
+    const articleTitle = allArticleTitles[indexOfArticle];
+    return articleTitle;
+
 }
 
 /*
@@ -24,6 +45,18 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    // let arrayNum = []
+    // for (let el of ARTICLE_TITLES) {
+    //     for (let ele of el){
+    //     if (ele.includes(Number)) {
+    //         return arrayNum.push(ele.includes(Number));
+    //     }
+    // }
+    //     return arrayNum
+    // }
+     return allArticleTitles.filter((element) =>
+       [...element].find((number) => number >= "0" && number <= "9")
+     );
 }
 
 /*
@@ -32,6 +65,11 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let sum = 0;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      sum += allArticleTitles[i].length;
+    }
+    return Math.round(sum / allArticleTitles.length);
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..4f915fd3 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -33,10 +33,27 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Solve the smaller problems, and then build those solutions back up to solve the larger problem.
         Functions can help with this!
 */
+function calculateAverage(arr) {
+  let sum = 0;
+  for (let price of arr) {
+    sum += price;
+  }
+  const average = sum / arr.length;
+  return average;
+}
+
+
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  const myArr = [];
+  for (let stock of closingPricesForAllStocks) {
+    const average = calculateAverage(stock);
+    const formattedAverage = Number(average.toFixed(2));
+    myArr.push(formattedAverage);
+  }
+  return myArr;
 }
 
+
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
     Implement the below function, which
@@ -48,7 +65,15 @@ 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 myArra = [];
+    for (let price of closingPricesForAllStocks) {
+      let firstDay = price[0];
+      let lastDay = price[price.length - 1];
+      let difference = lastDay - firstDay;
+      myArra.push(Number(difference.toFixed(2)));
+    }
+    return myArra;
 }
 
 /*
@@ -65,6 +90,17 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let arr = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+      arr.push(
+        `The highest price of ${stocks[
+          i
+        ].toUpperCase()} in the last 5 days was ${Math.max(
+          ...closingPricesForAllStocks[i]
+        ).toFixed(2)}`
+      );
+    }
+    return arr;
 }
 
 
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
index 31f8052c..6acfa989 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -10,6 +10,11 @@
 
 function factorial(input) {
     // TODO
+    let sum = 1
+    for (let i = 1; i <= input; i++){
+         sum *= i 
+    }
+    return sum
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..547d005d 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -12,6 +12,22 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+    const result = books.reduce((acc, cur) => {
+      const groupByGenre = cur.genre;
+      if (!acc[groupByGenre]) {
+        acc[groupByGenre] = [];
+      }
+      acc[groupByGenre].push(cur);
+      return acc;
+    }, {});
+    const genreName = Object.keys(result);
+    const arr = [];
+    for (let i = 0; i < genreName.length; i++) {
+      arr.push(
+        result[genreName[i]].sort((a, b) => b.rating - a.rating)[0].title
+      );
+    }
+    return arr;
 }
 
 
diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
index 9ef9aec7..19534567 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -15,6 +15,11 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+    let fibo = [0, 1];
+    for (let i = 0; i < n - 2; i++) {
+      fibo.push(fibo[i] + fibo[i + 1]);
+    }
+    return fibo;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */