CodeYourFuture · AzinYad · Aug 18, 2022 · Aug 19, 2022 · Aug 19, 2022 · Aug 22, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -12,15 +12,17 @@
 // Example 1
 let a;
 console.log(a);
-
+// here a hasn't assigned to any value. 
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+    let message = "Hello"; 
+    // this function doesn't return any value.
 }
 
+
 let hello = sayHello();
-console.log(hello);
+console.log(hello); 
 
 
 // Example 3
@@ -29,8 +31,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
-
+// user hasn't been defined here when we called the function
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+// There are only 3 parameters in this array so there isn't any index number of 3, indexes start from 0 to one less than the array length which is two here
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -1,12 +1,19 @@
 /*
     while loops can be useful when you want to execute some code as long as some condition is true.    
 
-    Using a while loop, complete the function below so it logs (using console.log) the first n even numbers as a comma-seperated string.
+    Using a while loop, complete the function below so it logs (using console.log) the first n even numbers as a comma-separated string.
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
 
 function evenNumbers(n) {
     // TODO
+    let array=[]
+    let i=0 
+    while ( i < n) {
+        array.push(i * 2)
+        i++
+    }
+   console.log(array.toString())
 }
 
 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
@@ -18,6 +18,13 @@ 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
@@ -8,6 +8,14 @@
 
 function evenNumbersSum(n) {
     // TODO
+    let i=0
+    let sum=0
+    do {
+        sum+=(i*2)
+        i++
+    }
+    while (i < n)
+    return sum
 }
 
 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
@@ -6,9 +6,9 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+
+for (i = 0; i < 26; i++) {
     console.log(String.fromCharCode(97 + i));
-    i++;
+
 }
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -28,6 +28,10 @@ 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
@@ -10,7 +10,14 @@ let tubeStations = [
     "Oxford Street",
     "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.
+// TODO Use a for-of loop to capitalize and output each letter in the string separately.
 let str = "codeyourfuture";
+
+for (const letter of str) {
+    console.log(letter.toUpperCase())
+}
diff --git 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
@@ -13,6 +13,12 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let tempRepo=[]
+    for (i=0 ; i < cities.length ; i++){
+        let temp=temperatureService(cities[i])
+        tempRepo.push(`The temperature in ${cities[i]} is ${temp} degrees`)
+    }
+return tempRepo
 }
 
 

diff --git 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 num;
+    do {
+        num = generateRandomNumber();
+    } while (num <= 50) 
+        return num;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,24 +6,62 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    let acceptedTitles=[]
+    let lengthCheck=0
+    for ( i=0 ; i < allArticleTitles.length ; i++){
+         lengthCheck= allArticleTitles[i].length
+     if (lengthCheck <= 65){
+        acceptedTitles.push(allArticleTitles[i])
+     }
+    }
+    return acceptedTitles
 }
 
+// function potentialHeadlines(allArticleTitles){
+//     let acceptedTitles=[]
+//     for (element of allArticleTitles){
+//        ( element.length <= 65 )? acceptedTitles.push(element):next
+//     }
+//     return acceptedTitles
+// }
+
 /*
     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)
+    Implement the function below, which returns the title with the fewest words.e
+    (you can assume words will always be separated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
-}
+    let minValue
+    let indexOfShortestTitle
+    let wordCountOFTitles=[]
+    let i=0
+    do {
+        let wordCount= allArticleTitles[i].trim().split(" ").length
+        wordCountOFTitles.push(wordCount)
+        i++
+   }
+   while(i < allArticleTitles.length)
 
+    minValue= Math.min(...wordCountOFTitles)
+    indexOfShortestTitle=wordCountOFTitles.indexOf(minValue)
+
+    return allArticleTitles[indexOfShortestTitle]
+}
 /*
-    The editor of the FT has realised that headlines which have numbers in them get more clicks!
+    The editor of the FT has realized that headlines which have numbers in them get more clicks!
     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 headlinesWithNumbers(allArticleTitles) {
     // TODO
+    let titleWithNum=[]
+   for (const title of allArticleTitles){
+        if (/\d/.test(title)){
+        titleWithNum.push(title)
+        }
+    }
+    return titleWithNum
 }
 
 /*
@@ -32,6 +70,11 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let sum=0
+     for (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
@@ -33,8 +33,35 @@ 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 getAveragePrices(closingPricesForAllStocks) {
+//     // TODO
+//     let averageArray=[]
+//     for (const array of closingPricesForAllStocks){
+//         let sum=0
+//         let average=0
+//         for (const value of array){
+//             sum+=value
+//         }
+//         average= parseFloat((sum / closingPricesForAllStocks[i].length).toFixed(2))
+//         averageArray.push(average)
+//     }
+//      return   averageArray
+// }
+
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+let aveArray=[]
+    for (i=0 ; i< closingPricesForAllStocks.length;i++){
+        let sum=0
+        let average=0
+        let j=0
+        do{
+            sum+= closingPricesForAllStocks[i][j]
+            j++
+        }while(j< closingPricesForAllStocks[i].length)
+         average= parseFloat((sum / closingPricesForAllStocks[i].length).toFixed(2))
+        aveArray.push(average)
+    }
+    return aveArray
 }
 
 /*
@@ -49,6 +76,13 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    let priceChangeArray=[]
+    for(i=0 ; i< closingPricesForAllStocks.length ; i++){
+         let priceChange=0
+       priceChange =parseFloat((closingPricesForAllStocks[i][(closingPricesForAllStocks[i].length -1)]-closingPricesForAllStocks[i][0]).toFixed(2))
+       priceChangeArray.push(priceChange)
+    }
+   return priceChangeArray 
 }
 
 /*
@@ -60,11 +94,20 @@ function getPriceChanges(closingPricesForAllStocks) {
         - Returns an array of strings describing what the highest price was for each stock.
             For example, the first element of the array should be: "The highest price of AAPL in the last 5 days was 180.33"
             The test will check for this exact string.
-    The stock ticker should be capitalised.
+    The stock ticker should be capitalized.
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let describingArray=[]
+    let max
+    let description
+    for (i=0 ; i< stocks.length ; i++){
+        max= Math.max(...closingPricesForAllStocks[i])
+        description= `The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${max.toFixed(2)}`
+        describingArray.push(description)
+    }
+    return describingArray
 }
 
 

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -10,6 +10,15 @@
 
 function factorial(input) {
     // TODO
+    let result=1
+    if (input===0 || input===1){
+        return 1
+    }else if (input > 1){
+        for (let i=input ;i > 1;  i--){
+            result*=i
+        }
+    }
+    return result
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -15,8 +15,25 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+    let sum=0
+    let fibonacciArray=[0]
+
+if(n===1){
+      return fibonacciArray  
+}   else if (n>=2){
+        fibonacciArray.push(1)
+        for (i=2 ; i < n ; i++){
+        sum=fibonacciArray[fibonacciArray.length-1] +fibonacciArray[fibonacciArray.length-2] 
+        fibonacciArray.push(sum)
+        }
+        return fibonacciArray
+    }else {
+    return `you should insert a positive integer number`
+   }
 }
 
+console.log(generateFibonacciSequence(4))
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the first 10 numbers in the Fibonacci Sequence", () => {
     expect(generateFibonacciSequence(10)).toEqual(