diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..2096366a 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,6 +12,7 @@
 // Example 1
 let a;
 console.log(a);
+we did not define a.
 
 
 // Example 2
@@ -21,6 +22,7 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
+we need to call hello () not just hello 
 
 
 // Example 3
@@ -29,8 +31,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
+there is no variable and definition Here.
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+there is nothing for [3] it is empty
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..10a96c0c 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,8 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let i = 0; 
+
+while (i<=n){
+  if(i%2==0)
+    i++;
+
+}
 }
+console.log(evenNumbers());
 
 evenNumbers(3); // should output 0,2,4
 evenNumbers(0); // should output nothing
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..81beea03 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -18,6 +18,11 @@ 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"
+console.log(findFirstJulyBDay(BIRTHDAYS)); // should output “July 11th”
\ No newline at end of file
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..6d146b1f 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,9 +7,20 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
-}
+    let counter = 1;
+    let sum = 0;
+    
+    do {
+      if (counter % 2 === 0) {
+        sum = sum + counter;
+      }
+      counter ++;
+    } while (counter <= n){
 
+    return sum;
+}}
+
+    // TODO
 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
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..c7901d7b 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,8 @@
 
 
 // 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));
 }
 // 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..cc33f916 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,6 +27,13 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for (let i=0; i<(WRITERS.length); i++){
+    
+console .log ((`${WRITERS [i]} is  ${AGES[i]} years old`))
+}
+
+// (WRITERS,AGES).forEach((WRITER, AGE) =>  console .log (`${WRITER } is  ${AGE} 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..fdf1b133 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -10,7 +10,12 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
-
+for (let tubeStation of tubeStations){
+    console.log(tubeStation.toUpperCase(""));
+}
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let tube of str){
+    console.log(tube.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..6a9bf866 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,52 +12,51 @@
 */
 
 function getTemperatureReport(cities) {
-    // 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;
 }
-
-
 /* ======= 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-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..053c8e71 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -5,12 +5,18 @@
 
 // This function shouldn't be changed
 function generateRandomNumber() {
-    console.log("Generating number...");
-    return Math.round(Math.random() * 100);
+     console.log("Generating number...");
+     return Math.round(Math.random() * 100);
+
 }
 
 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..79a02d2d 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,6 +5,8 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
+ 
+    return allArticleTitles.filter(items=> items.length < 65);
     // TODO
 }
 
@@ -14,6 +16,11 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
+    let title = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        title.push(allArticleTitles [i].split (' ').length);
+    }
+    return allArticleTitles[title.indexOf(Math.min(...title))];
     // TODO
 }
 
@@ -24,13 +31,22 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+  return allArticleTitles.filter((element) =>
+       [...element].find((number) => number >= "0" && number <= "9")
+     );
 }
 
+
 /*
     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) {
+ let sum = 0;
+ for (let i = 0; i < allArticleTitles.length; i++) {
+   sum += allArticleTitles[i].length;
+ }
+ return Math.round(sum / allArticleTitles.length);
     // TODO
 }
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..c79b592f 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -33,10 +33,28 @@ 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(newPrice) {
+  let sum = 0;
+  for (let price of newPrice) {
+    sum += price;
+  }
+  const average = sum / newPrice.length;
+  return average;
+}
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  // TODO
+  const myPrice = [];
+  for (let stock of closingPricesForAllStocks) {
+    const average = calculateAverage(stock);
+    const formattedAverage = Number(average.toFixed(2));
+    myPrice.push(formattedAverage);
+  }
+  return myPrice;
 }
 
+// let stocks = ["aapl", "msft", "amzn", "googl", "tsla"];
+// showStocks(stocks);
+// changeInPrices(closingPricesLast5Days);
 /*
     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
@@ -48,6 +66,14 @@ 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) {
+      let myPrice1 = [];
+      for (let price of closingPricesForAllStocks) {
+        let firstDay = price[0];
+        let lastDay = price[price.length - 1];
+        let difference = lastDay - firstDay;
+        myPrice1.push(Number(difference.toFixed(2)));
+      }
+      return myPrice1;
     // TODO
 }
 
@@ -64,6 +90,17 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
+     let newPrice = [];
+     for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+       newPrice.push(
+         `The highest price of ${stocks[
+           i
+         ].toUpperCase()} in the last 5 days was ${Math.max(
+           ...closingPricesForAllStocks[i]
+         ).toFixed(2)}`
+       );
+     }
+     return newPrice;
     // TODO
 }
 
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
index 31f8052c..c72058b0 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -9,6 +9,11 @@
 */
 
 function factorial(input) {
+    let sum = 1;
+    for (i = 1; i <= input; i++) {
+      sum *= i;
+    }
+    return sum;
     // TODO
 }
 
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..5d3eedc6 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -11,6 +11,22 @@
 */
 
 function getHighestRatedInEachGenre(books) {
+    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;
     // TODO
 }
 
diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
index 9ef9aec7..0c79ef92 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -14,24 +14,27 @@
 */
 
 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;
+  // TODO
 }
 
 /* ======= 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,
+  ]);
+});