CodeYourFuture · Danti8686 · Sep 19, 2022 · Sep 21, 2022 · Sep 21, 2022 · Sep 23, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -10,13 +10,14 @@
 */
 
 // Example 1
-let a;
+let a = "ahmed"; // in this example we shuold add value to the variable.
 console.log(a);
 
 
 // Example 2
 function sayHello() {
     let message = "Hello";
+    return message;           //in the examplewe need to write return to avoide the undefined.
 }
 
 let hello = sayHello();
@@ -28,9 +29,9 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser("Omer"); // for this example we miss to add value when we call the function.
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]);// because the arr has 3 item and the firest item start with 0 and 1 and 2 but there is no for item.
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,13 @@
 
 function evenNumbers(n) {
     // TODO
+    let myArray = [];
+    let i = 0;
+    while (n > myArray.length) {
+        myArray.push(i);
+        i += 2;
+    }
+console.log(myArray);
 }
 
 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
@@ -1,7 +1,8 @@
 /*
     Loops can be useful when working with arrays.
     In the below example, imagine we've defined an array holding the birthdays of your closest friends.
-    Use a while loop to search through the array until you find the first birthday in July, then return that birthday from the function.
+    Use a while loop to search through the array until you find the first birthday in 
+    July, then return that birthday from the function.
 */
 
 const BIRTHDAYS = [
@@ -18,6 +19,12 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+
+    let num = 0;
+	while (num < birthdays.length) {
+		if (birthdays[num].includes("July")) return birthdays[num];
+		num++;
+	}
 }
 
 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
@@ -8,7 +8,18 @@
 
 function evenNumbersSum(n) {
     // TODO
-}
+    const ourArray = []; 
+    let i = 0;
+
+    do {
+    ourArray.push(i);
+    i++;
+    } while (i < 10);
+      return i;
+    }
+
+    console.log(sumEvens(ourArray));
+
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0

diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,10 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+// let i = 0;
+// while(i < 26)
+for (let i = 0; i < 26; i++) {
     console.log(String.fromCharCode(97 + i));
-    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
@@ -27,6 +27,12 @@ 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");
+
+
+}
 
 /*
 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 +10,13 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
+for (i of tubeStations) {
+    console.log(i);
+}
 
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (i of str) {
+    console.log(i);
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -13,9 +13,16 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let report = [];
+    for(let city of cities) {
+        let temperature = temperatureService(city);
+        report.push(`The temperature in ${city} is ${temperature} degrees`);
+    }
+    return report;
 }
 
 
+
 /* ======= 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
@@ -11,6 +11,13 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let generatedNumber;
+
+    do {
+        generatedNumber = generateRandomNumber();
+    } while(generatedNumber <= 50); 
+
+    return generatedNumber;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,6 +6,15 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    let headlines = [];
+
+    for(let title of allArticleTitles) {
+        if(title.length <= 65) {
+            headlines.push(title);
+        }
+    }
+
+    return headlines;
 }
 
 /*
@@ -15,6 +24,22 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let fewestWordsSoFar;
+    let titleWithFewestWords;
+
+    for(let title of allArticleTitles) {
+
+        // working out the number of words in the title by splitting on the space character
+        // this will generate an array. Read more: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split
+        let numWords = title.split(' ').length;
+
+        if(fewestWordsSoFar === undefined || numWords < fewestWordsSoFar) {
+            fewestWordsSoFar = numWords;
+            titleWithFewestWords = title;
+        }
+    }
+
+    return titleWithFewestWords;
 }
 
 /*
@@ -24,6 +49,27 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    let articlesWithNumbers = [];
+
+    for(let title of allArticleTitles) {
+        // Making use of the new function created below
+        if(doesTitleContainANumber(title)) {
+            articlesWithNumbers.push(title);
+        }
+    }
+
+    return articlesWithNumbers;
+}
+
+// Creating another function to help break this problem down into smaller parts
+function doesTitleContainANumber(title) {
+    for(let character of title) {
+        if(character >= '0' && character <= '9') {
+            return true;
+        }
+    }
+
+    return false;
 }
 
 /*
@@ -32,6 +78,13 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let totalCharacters = 0;
+
+    for(let title of allArticleTitles) {
+        totalCharacters += title.length;
+    }
+
+    return Math.round(totalCharacters / allArticleTitles.length);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,6 +35,27 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let averages = [];
+
+    for(let pricesForStock of closingPricesForAllStocks) {
+        averages.push(getAveragePricesForStock(pricesForStock));
+    }
+
+    return averages;
+}
+
+function getAveragePricesForStock(pricesForStock) {
+    let total = 0;
+
+    for(let price of pricesForStock) {
+        total += price;
+    }
+
+    return roundTo2Decimals(total / pricesForStock.length);
+}
+
+function roundTo2Decimals(num) {
+    return Math.round(num * 100) / 100;
 }
 
 /*
@@ -48,7 +69,18 @@ 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
+    // TODOlet changes = [];
+
+    for(let pricesForStock of closingPricesForAllStocks) {
+        changes.push(getPriceChangeForStock(pricesForStock))
+    }
+
+    return changes;
+}
+
+function getPriceChangeForStock(pricesForStock) {
+    let priceChange = pricesForStock[pricesForStock.length - 1] - pricesForStock[0]
+    return roundTo2Decimals(priceChange);
 }
 
 /*
@@ -65,6 +97,39 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let descriptions = [];
+
+    for(let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let highestPrice = getHighestPrice(closingPricesForAllStocks[i]);
+        descriptions.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPrice.toFixed(2)}`);
+    }
+
+    return descriptions;
+}
+
+function getHighestPrice(pricesForStock) {
+    // initialising to 0, as we're expecting this value to be overriden by the first price in the array
+    let highestPriceSoFar = 0;
+
+    for(let price of pricesForStock) {
+        // if this price is higher than the highest price we've seen so far, it becomes the new highest price
+        if(price > highestPriceSoFar) {
+            highestPriceSoFar = price;
+        }
+    }
+
+    return highestPriceSoFar;
+}
+
+function highestPriceDescriptionsAlternate(closingPricesForAllStocks, stocks) {
+    let descriptions = [];
+
+    for(let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let highestPrice = Math.max(...closingPricesForAllStocks[i]);
+        descriptions.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPrice.toFixed(2)}`);
+    }
+
+    return descriptions;
 }
 
 

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;
+
+    let i = input
+    do {
+        result *= i;
+        i--;
+    } while(i > 0);
+
+    return result;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -12,6 +12,20 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+    let highestRated = {};
+
+    for(let book of books) {
+        // if this is the first time we're seeing this genre OR the rating we've seen is not as high as the current book
+        if(highestRated[book.genre] === undefined || highestRated[book.genre].rating < book.rating) {
+            // then this book is now the highest rated in the genre so far
+            highestRated[book.genre] = book;
+        }
+    }
+
+    // Here we just want to get the highest rated books (the values of the object)
+    // and then get the title for each one
+    return Object.values(highestRated)
+            .map(book => book.title);
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -15,6 +15,19 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+    let fibonacciSequence = [];
+
+    // just initialise the first 2 values in the sequence
+    fibonacciSequence[0] = 0;
+    fibonacciSequence[1] = 1;
+
+    // the remaining numbers can be calculated
+    for (i = 2; i < n; i++) {
+        // each number is equal to the sum of the previous 2 numbers
+        fibonacciSequence[i] = fibonacciSequence[i - 2] + fibonacciSequence[i - 1];
+    }
+
+    return fibonacciSequence;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */