diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..121aa6b3 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,13 +12,15 @@
 // Example 1
 let a;
 console.log(a);
-
+//In this example, we see undefined because our variable doesn't have any value.
 
 // Example 2
 function sayHello() {
     let message = "Hello";
+    // In this example, We don't have return, so I would write return in this line. =>  return message;
 }
 
+
 let hello = sayHello();
 console.log(hello);
 
@@ -29,8 +31,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
-
+//In this example,We do not have an argument because this is a function that has parameters, so outside the function it should have a value.
+//I mean => sayHelloToUser(" we should write some string because od user")for example : sayHelloToUser("dear volunteer");
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+ //We have an array with the indexes o, 1, and 2 here, so there isn't index 3. we can Write arr[0] or arr[1] or arr [2]
\ No newline at end of file
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..e94ee5e1 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+  let num= 0 ;
+  let arr =[]
+  while(n > 0){
+   arr.push(num)
+   num += 2
+   n--
+  }
+  console.log(arr)
 }
-
 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..ff7c4b55 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,16 @@ 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..5c2ecaa3 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 result = 0;
+     let i = 0 * 2;
+     do{
+        result += i * 2; 
+        i++;
+     }while(i < n)
+
+     return result 
 }
 
 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..4842c01d 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++;
+// }
+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..4bc28ab2 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,7 +27,10 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+for(i = 0;i <= WRITERS.length;i++ ){
+    const result=`${WRITERS[i]} is ${AGES[i]} years old `
+    console.log(result)
+}
 /*
 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..7d83d7f8 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,13 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for(const element of tubeStations ){
+    console.log(element)
+}
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for(const element of str){
+  console.log(element.toLocaleUpperCase())
+}
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..1e6224f7 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+      let  temperature=[];
+    // for(let i = 0;i < cities.length; i++){
+        for(const city of cities){
+        temperature.push(`The temperature in ${city} is ${temperatureService(city)} degrees`)
+    }
+    return temperature;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..a53b5699 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,7 +10,12 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+       let random = generateRandomNumber() ;
+    let  i = 0;
+    do{
+        random = generateRandomNumber() 
+    }while ( random <= 50)
+ return random;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..1d181bef 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,7 +5,13 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+     let arr =[];
+    for (let article of allArticleTitles){
+        if (article.length <= 65){
+            arr.push(article)
+        }
+    }
+    return arr;
 }
 
 /*
@@ -14,7 +20,11 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+     let arr = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      arr.push(allArticleTitles[i].split(" ").length);
+    }
+    return allArticleTitles[arr.indexOf(Math.min(...arr))];
 }
 
 /*
@@ -23,7 +33,17 @@ 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 arr=[]
+    for (let article of allArticleTitles){
+        for (let char of article){
+            if (char>="0" && char<="9"){
+                arr.push (article);
+                break;
+            }
+
+        }
+    }
+    return arr
 }
 
 /*
@@ -31,7 +51,11 @@ function headlinesWithNumbers(allArticleTitles) {
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+     let sum=0;
+    for (let article of allArticleTitles){
+        sum+=article.length;
+    }
+    return Math.round(sum/allArticleTitles.length)
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..da8be378 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -34,7 +34,16 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+    let averageArr=[];
+    for (let closingPricesForStock of closingPricesForAllStocks){
+        let sum =0;
+        for (let item of closingPricesForStock){
+            sum=sum+item;
+        }
+        averageArr.push(Number((sum/closingPricesForStock.length).toFixed(2)));
+
+    }
+    return averageArr;
 }
 
 /*
@@ -48,7 +57,12 @@ 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 arr=[];
+   for (let closingPricesForStock of closingPricesForAllStocks){    
+    arr.push(Number((closingPricesForStock[closingPricesForStock.length-1]-closingPricesForStock[0]).toFixed(2)));
+
+   }
+   return arr;
 }
 
 /*
@@ -64,7 +78,11 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 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..2036d2ac 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -9,7 +9,11 @@
 */
 
 function factorial(input) {
-    // TODO
+      let sum = 1
+    for (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..e109e872 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
+     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..24f7c13e 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -14,7 +14,11 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+      let fib = [0, 1];
+    for (let i = 0; i < n - 2; i++) {
+      fib.push(fib[i] + fib[i + 1]);
+    }
+    return fib;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */