CodeYourFuture · s-shah-coder · Jan 13, 2022 · Jan 13, 2022 · mahri09 · Jan 14, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -11,7 +11,8 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); 
+// We declare the variable 'a' but we haven't assigned a value to it yet.
 
 
 // Example 2
@@ -22,6 +23,8 @@ function sayHello() {
 let hello = sayHello();
 console.log(hello);
 
+// We are not returning anything from the function body and so the default return is undefined.
+
 
 // Example 3
 function sayHelloToUser(user) {
@@ -30,7 +33,11 @@ function sayHelloToUser(user) {
 
 sayHelloToUser();
 
+// We are not providing any arguments for the function call and so the user is undefined.
+
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); 
+
+// arr[3] is the 4th item of the array which has not been assigned a value and so it's undefined.
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,17 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let arr = [];
+    let i = 0;
+    while (i%2 === 0 && n > 0 && n > arr.length) {
+        arr.push(i);
+        i+=2;
+    }
+    return arr.toString();
 }
 
+console.log(evenNumbers(3));
+
 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
@@ -17,7 +17,14 @@ 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
@@ -7,7 +7,16 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let i = 0;
+    let sumTotal = 0;
+    do {
+        i++;
+        if (i % 2 == 0) {
+            sumTotal += i * 3;
+        }
+    } while (i < n);
+
+    return sumTotal;
 }
 
 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 +6,13 @@
 
 
 // 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 (let i = 0; i < 26; i++) {
+    console.log(String.fromCharCode(97 + i));
+}
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 < WRITERS.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
@@ -11,6 +11,14 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (let trainStops of tubeStations) {
+    console.log(trainStops);
+}
 
-// 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 (let letterCapitalize of str) {
+    console.log(letterCapitalize.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
@@ -12,10 +12,14 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let newArray = [];
+    for (let i = 0; i < cities.length; i++){
+        newArray.push("The temperature in " + cities[i] + " is " + temperatureService(cities[i]) + " degrees");
+
+    }
+    return newArray;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -10,9 +10,15 @@ 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 ===== */
 
 test("Returned value should always be greater than 50", () => {

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -5,33 +5,75 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let newArray = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].length <= 65) {
+            newArray.push(allArticleTitles[i]);
+        }
+    }
+    return newArray;
 }
 
 /*
     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)
+    (you can assume words will always be separated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
-}
+  let newString=''
+  for (let i = 0; i < allArticleTitles.length; i++) {
+    if (
+      newString.length < 1 ||
+      newString.split(" ").length > allArticleTitles[i].split(" ").length
+    ) {
+      newString = allArticleTitles[i];
+    }
+
+  }
+
+   return newString;
+} 
+
 
 /*
-    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 newClicks = [];
+
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        for (let letter of allArticleTitles[i])  {
+            if (letter === "0"||
+                letter === "1"||
+                letter === "2"||
+                letter === "3"||
+                letter === "4"||
+                letter === "5"||
+                letter === "6"||
+                letter === "7"||
+                letter === "8"||
+                letter === "9") {
+                newClicks.push(allArticleTitles[i])
+            }
+
+        }
+    }
+    return newClicks;
 }
 
 /*
     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 totalLength = 0;
+
+    for (let i = 0; i < allArticleTitles.length; i++) {
+          totalLength += allArticleTitles[i].length  
+    }
+    return (Math.round(totalLength / allArticleTitles.length))
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,8 +35,20 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let newAverage =[]
+    let sum = 0;
+    for(let i = 0; i < STOCKS.length; i++){
+        for( let j=0; j < CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i].length; j++){
+          sum += CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i][j]; 
+        }
+        newAverage.push(
+          ((sum /CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i].length).toFixed(2)) * 1);
+        sum = 0;
+    }
+   return newAverage;
 }
 
+
 /*
     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 +60,12 @@ 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
+    getPriceChange = [];
+    for (price of closingPricesForAllStocks) {
+        let priceChange = Number((price[price.length -1] - price[0]).toFixed(2));
+        getPriceChange.push(priceChange);
+    }
+    return getPriceChange;
 }
 
 /*
@@ -60,11 +77,15 @@ 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
+    highestPriceLast5Days = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        highestPriceLast5Days.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${Math.max(...closingPricesForAllStocks[i]).toFixed(2)}`);
+    }
+    return highestPriceLast5Days;
 }
 
 

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -9,9 +9,16 @@
 */
 
 function factorial(input) {
-    // TODO
+    if (input === 0 || input === 1)
+        return 1;
+     for(let i = input -1; i >= 1 ; i--) {
+        input *= i;
+     }
+     return input;
 }
 
+console.log(factorial(3))
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("3! should be 6", () => {

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -11,7 +11,15 @@
 */
 
 function getHighestRatedInEachGenre(books) {
-    // TODO
+
+    let newArray = [];
+
+    for (let i = 0; i < books.length; i++) {
+        if(books[i].rating > 4.8) {
+            newArray.push(books[i].title)
+        }
+    }
+    return newArray;
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -14,7 +14,14 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+    let fib = [0, 1];
+    let newFib = [0, 1];
+
+    for(let i = 2; i < n; i++) {
+        fib[i] = fib[i - 1] + fib[i - 2];
+        newFib.push(fib[i]);
+    }
+    return newFib;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */