CodeYourFuture · LexiisYing · Dec 17, 2022 · Jan 5, 2023 · Feb 15, 2023
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -11,26 +11,29 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); 
+// there's no values assigned to the variable.
 
 
 // Example 2
 function sayHello() {
     let message = "Hello";
 }
+// there's no output.
 
 let hello = sayHello();
 console.log(hello);
-
+// because the function sayhello does not return anything so this is not defined.
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+// no argument.
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+// there's no 4th(arr index 3) element in the arr. 
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,13 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let result = [];
+    let i = 0;
+    while(i < n) {
+        result.push(i * 2);
+        i++;
+    }
+    console.log(result.join());
 }
 
 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
@@ -17,7 +17,13 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    let i = 0;
+    while (i < BIRTHDAYS.length) {
+        if (BIRTHDAYS[i].startsWith("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 sum = 0;
+    let i = 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
@@ -7,8 +7,7 @@
 
 // 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
@@ -27,7 +27,9 @@ 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
@@ -1,5 +1,6 @@
 /*
-    A for-of loop is a easy and way of looping through the elements of an array, string or any other "iterable object" (think sequence of elements).    
+    A for-of loop is a easy and way of looping through the elements of an array, 
+    string or any other "iterable object" (think sequence of elements).    
 */
 
 // TODO Use a for-of loop to output each of the tube stations below.
@@ -10,7 +11,12 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
-
+for (let station of tubeStations) {
+    console.log(station);
+}
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let letter of str) {
+    console.log(letter.toUpperCase());
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -12,10 +12,17 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let report = [];
+    for (let city of cities) {
+        let temparature = temperatureService(city);
+        report.push(`The temperature in ${city} is ${temparature} 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
@@ -10,7 +10,12 @@ 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
@@ -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 headlines = [];
+    for (let title of allArticleTitles) {
+        if (title.length <= 65)
+            headlines.push(title)
+
+    }
+    return headlines;
 }
 
 /*
@@ -23,15 +29,27 @@ 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 articleWithNumbers = [];
+
+    for ( let title of allArticleTitles) {
+        if (character >= "0" && character <= "9") 
+        articleWithNumbers.push(title)
+    }
+
+    return articleWithNumbers;
 }
 
 /*
     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 totalCharacters = 0;
+
+    for (let title of allArticleTitles) {
+        totalCharacters += title.length;
+    }
+    return Math.round(totalCharacters / allArticleTitles.length);
 }
 
 

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -10,8 +10,23 @@
     Each title in the resulting array should be the highest rated book in its genre.
 */
 
+// From the solution : 
 function getHighestRatedInEachGenre(books) {
-    // TODO
+    // this will be an object where the property will be a genre, and the value will be an object representing the book
+    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);
 }