CodeYourFuture · TresorBipa · Jul 9, 2022 · Jul 9, 2022 · Jul 9, 2022 · Jul 10, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -11,7 +11,7 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); // A: We haven't initialised the variable with a value.
 
 
 // Example 2
@@ -20,17 +20,18 @@ function sayHello() {
 }
 
 let hello = sayHello();
-console.log(hello);
+console.log(hello); // A: We aren't returning anything from the function body and thus the default return is undefined.
+
 
 
 // Example 3
 function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+    console.log(`Hello ${user}`); // A: We aren't providing any arguments for the function call and thus user is undefined.
 }
 
 sayHelloToUser();
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); //  A: arr[3] is the 4th item of the array which hasn't been assigned a value or the index 3 and thus it's undefined.
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -7,8 +7,17 @@
 
 function evenNumbers(n) {
     // TODO
+    let i = 0, str = ``;
+    while (n > 0) {
+        (n === 1) ? str += `${i}` :
+        str += `${i},`;
+        i += 2;
+        n--;
+    }
+    console.log(str);
 }
 
+
 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
@@ -16,8 +16,31 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
+// COUNTER VARIABLE
+let i = 0;
+
+// HELPER FUNCTION
+function notInJuly (date) {
+
+    return date.search("July") === -1;
+
+}
+
 function findFirstJulyBDay(birthdays) {
     // TODO
+
+    while (i < birthdays.length) {
+
+        if (notInJuly(birthdays[i])) {
+
+            i++;
+            continue;
+
+        }
+
+        return birthdays[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 +8,18 @@
 
 function evenNumbersSum(n) {
     // TODO
+
+    let arr = [], i = 0;
+    do {
+        if (i % 2 !== 0) {
+            i++;
+            continue;
+        } else {
+            arr.push(i);
+            i += 2;
+        }
+    } while (arr.length < n);
+    return arr.reduce((a, b) => a + b);
 }
 
 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 +6,11 @@
 
 
 // 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 + 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 +28,15 @@ const AGES = [
 
 // TODO - Write for loop code here
 
+function showWritersAge(name, age) {
+    for (let i = 0; i < name.length; i++) {
+        console.log(`${name[i]} is ${age[i]} years old.`);
+    }
+    return;
+}
+
+showWritersAge(WRITERS, AGES);
+
 /*
 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 +11,15 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (let i = 0; i < tubeStations.length; i++) {
+    console.log(tubeStations[i]);
+}
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+
+for (let i = 0; i < str.length; i++) {
+    console.log(str[i].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
@@ -13,23 +13,25 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    return cities.map((value, index) => `The temperature in ${value} is ${temperatureService(value)} degrees`);
 }
 
 
+
 /* ======= 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);
+    let temperatureMap  = new Map();
+
+    temperatureMap.set('London', 10);
+    temperatureMap.set('Paris', 12);
+    temperatureMap.set('Barcelona', 17);
+    temperatureMap.set('Dubai', 27);
+    temperatureMap.set('Mumbai', 29);
+    temperatureMap.set('São Paulo', 23);
+    temperatureMap.set('Lagos', 33);
 
-    return temparatureMap.get(city);
+    return temperatureMap.get(city);
 }
 
 test("should return a temperature report for the user's cities", () => {

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -11,8 +11,15 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+
+    let num = 0;
+    do {
+        num = generateRandomNumber();
+    } while (num < 51);
+    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
@@ -6,24 +6,38 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+
+    return allArticleTitles.filter( value => value.length <= 65);
 }
 
 /*
     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 shortestTitle = allArticleTitles[0];
+    allArticleTitles
+    .forEach((element, index) => {shortestTitle.length > element.length ? shortestTitle = element : 0;
+    });
+    return shortestTitle;
 }
 
 /*
     The editor of the FT has realised 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 isTitleWithNumber (element) {
+    return (element.match(/\d/gi) != null);
+}
+
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter(isTitleWithNumber);
 }
 
 /*
@@ -32,6 +46,13 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+
+    let amountOfTitles = 0, sumOfChar = 0;
+    for (let title of allArticleTitles) {
+        amountOfTitles++;
+        sumOfChar += title.length;
+    }
+    return Math.round(sumOfChar / amountOfTitles);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,6 +35,15 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+
+    return closingPricesForAllStocks.map((value, index) => {
+        let sum = 0, counter = 0;
+        for (let item of value) {
+            sum += item;
+            counter++;
+        }
+        return parseFloat((sum/counter).toFixed(2));
+    })
 }
 
 /*
@@ -49,6 +58,8 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+
+    return closingPricesForAllStocks.map(value => parseFloat((value[4] - value[0]).toFixed(2))); 
 }
 
 /*
@@ -65,6 +76,11 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+
+    return closingPricesForAllStocks.map((value, index) => {
+        value.sort((a, b) => b-a);
+        return `The highest price of ${stocks[index].toUpperCase()} in the last 5 days was ${value[0].toFixed(2)}`;
+    })
 }
 
 

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -10,6 +10,12 @@
 
 function factorial(input) {
     // TODO
+
+    let product = 1;
+    for (let i = input; i > 0; i -= 1) {
+      product *= i;
+    }
+    return product;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -12,6 +12,22 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+
+    const genre = [];
+  books.forEach((book) => {
+    if (!genre.includes(book.genre)) {
+      genre.push(book.genre);
+    }
+  });
+  const bestBooksOfGenres = [];
+  genre.forEach((genre) =>
+    bestBooksOfGenres.push(
+      books
+        .filter((book) => book.genre === genre)
+        .sort((bookA, bookB) => bookB.rating - bookA.rating)[0].title
+    )
+  );
+  return bestBooksOfGenres;
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -15,6 +15,15 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+
+    const fibonSequence = [0, 1];
+    for (let i = n - 2; i > 0; i -= 1) {
+      fibonSequence.push(
+        fibonSequence[fibonSequence.length - 2] +
+          fibonSequence[fibonSequence.length - 1]
+      );
+    }
+    return fibonSequence;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/README.md b/README.md
@@ -17,8 +17,7 @@ This is a **private** repository. Please request access from your Teachers, Budd
 
 - Each of the *.js files in the `1-exercises` folder can be run from the terminal using the `node` command with the path to the file. For example, `node 1-exercises/A-undefined/exercise.js` can be run from the root of the project.
 - To run the tests in the `2-mandatory` folder, run `npm run test` from the root of the project (after having run `npm install` once before).
-- To run the tests in the `3-extra` folder, run `npm run extra-tests` from the root of the project (after having run `npm install` once before).
-
+- To run the tests in the `3-extra` folder, run `npm run extra-tests` from the root of the project (after having run `npm install` once before)
 ## Instructions for submission
 
 For your homework, we'll be using [**test driven development**](https://medium.com/@adityaalifnugraha/test-driven-development-tdd-in-a-nutshell-b9e05dfe8adb) to check your answers. Test driven development (or TDD) is the practice of writing tests for your code first, and then write your code to pass those tests. This is a very useful way of writing good quality code and is used in a lot of industries. You don't have to worry about knowing how this works, but if you're curious, engage with a volunteer to find out more! :)