CodeYourFuture · Arbeits-Sachen · Aug 15, 2022 · Aug 15, 2022 · Aug 15, 2022 · Aug 15, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -11,12 +11,12 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); //Variable a didnt get a value assigned
 
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+    let message = "Hello"; //The function doesnt return anything
 }
 
 let hello = sayHello();
@@ -28,9 +28,9 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser(); //There is no string the function could take to fill the "user"
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); //The last array position is 2 not 3
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -5,8 +5,24 @@
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
 
-function evenNumbers(n) {
-    // TODO
+function evenNumbers(n)
+{
+    let total = "0";
+    let calc = 0;
+
+    if (n === 0)
+    {
+        return console.log("");
+    }
+
+    for(let i = 1; i < n; i++)
+    {
+        calc = calc + 2;
+
+        total = total + ", " + calc;
+    }
+
+    return console.log(total);
 }
 
 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
@@ -16,8 +16,19 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
-function findFirstJulyBDay(birthdays) {
-    // TODO
+function findFirstJulyBDay(birthdays)
+{
+    let Arrlength = birthdays.length;
+    i = 0;
+
+    while(i < Arrlength)
+    {
+        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
@@ -6,10 +6,21 @@
     Using a do-while loop, write a function which returns the sum of the first n even numbers (starting from 0)
 */
 
-function evenNumbersSum(n) {
-    // TODO
+function evenNumbersSum(n)
+{
+    total = 0;
+    i = 0;
+
+    do
+    {
+        total += i * 2
+        i++;
+    }
+    while ( i < n );
+
+    return total;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
+console.log(evenNumbersSum(10)); // should output 90
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,8 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+for(let 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 +27,10 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+for (let i = 0; i < WRITERS.length; i++)
+{
+    console.log(WRITERS[i] + " is " + AGES[i] + " old")
-    console.log(WRITERS[i] + " is " + AGES[i] + " old")
+    console.log(WRITERS[i] + " is " + AGES[i] + "years old")
-    console.log(WRITERS[i] + " is " + AGES[i] + " old")
+    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 +11,15 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (i of tubeStations)
-for (i of tubeStations)
+for (const station of tubeStations)
-for (i of tubeStations)
+for (const station 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.toUpperCase())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -11,8 +11,15 @@
         - Hint: you can call the temperatureService function from your function
 */
 
-function getTemperatureReport(cities) {
-    // TODO
+function getTemperatureReport(cities)
+{
+    let TemperatureArray = [];
+
+    for (let city of cities)
+    {
+        TemperatureArray.push("The temperature in " + city + " is " + temperatureService(city) + " degrees");
+    }
+    return TemperatureArray;
 }
 
 
@@ -60,4 +67,4 @@ test("should return a temperature report for the user's cities (alternate input)
 
 test("should return an empty array if the user hasn't selected any cities", () => {
     expect(getTemperatureReport([])).toEqual([]);
-});
+});
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -9,8 +9,16 @@ function generateRandomNumber() {
     return Math.round(Math.random() * 100);
 }
 
-function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+function getRandomNumberGreaterThan50()
+{
+    let total;
+    do
+    {
+        (total = generateRandomNumber());
+    }
+    while (total <= 50);
+
+    return total;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -1,40 +1,72 @@
 /*
     Imagine you are working on the Financial Times web site! They have a list of article titles stored in an array.
-
     The home page of the web site has a headline section, which only has space for article titles which are 65 characters or less.
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
-function potentialHeadlines(allArticleTitles) {
-    // TODO
+
+function potentialHeadlines(allArticleTitles)
+{
+    let AcceptedArticles = []
+
+    for (let i = 0; i < allArticleTitles.length; i++)
+    {
+        if (allArticleTitles[i].length <= 65)
+        {
+            AcceptedArticles.push(allArticleTitles[i]);
+        }
+    }
+    return AcceptedArticles;
 }
 
 /*
     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)
 */
-function titleWithFewestWords(allArticleTitles) {
-    // TODO
+
+function titleWithFewestWords(allArticleTitles)
+{
+    const shorter = (left, right) => left.length <= right.length ? left : right;
+
+    return allArticleTitles.reduce(shorter);
 }
 
 /*
     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 headlinesWithNumbers(allArticleTitles) {
-    // TODO
+
+function headlinesWithNumbers(allArticleTitles)
+{
+    let AcceptedArticles = [];
+
+    for (let i = 0; i < allArticleTitles.length; i++)
+    {
+        if (/\d/.test(allArticleTitles[i]))
+        {
+            AcceptedArticles.push(allArticleTitles[i]);
+        }
+    }
+    return AcceptedArticles;
 }
 
 /*
     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
-}
 
+function averageNumberOfCharacters(allArticleTitles)
+{
+    let AllChar = 0;
+    let Average = 0;
+    for (let i = 0; i < allArticleTitles.length; i++)
+    {
+        AllChar += (allArticleTitles[i].length);
+    }
 
+    return Math.round(Average = AllChar / allArticleTitles.length);
+}
 
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -33,8 +33,14 @@ 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
+//https://jrsinclair.com/articles/2019/five-ways-to-average-with-js-reduce/
+function getAveragePrices(closingPricesForAllStocks)
+{
+    //const reduce  = r => i => a => a.reduce(r, i);
+    //conatiner   =     getting items                      => got items.reduce          =>      add    /    length         .map previous  =>       round to 2 dec
+    const average = (closingPricesForAllStocks.map((array) => array.reduce((r, current) => r + current / array.length, 0))).map((element) => parseFloat(element.toFixed(2)));
+
+    return average;
 }
 
 /*
@@ -47,8 +53,12 @@ function getAveragePrices(closingPricesForAllStocks) {
                 (Apple's price on the 5th day) - (Apple's price on the 1st day) = 172.99 - 179.19 = -6.2
     The price change value should be rounded to 2 decimal places, and should be a number (not a string)
 */
-function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+
+function getPriceChanges(closingPricesForAllStocks)
+{
+    const PriceChange = (closingPricesForAllStocks.map((array) => array[array.length - 1] - array[0])).map((element) => parseFloat(element.toFixed(2)));
+
+    return PriceChange;
-function getPriceChanges(closingPricesForAllStocks)
-{
-    const PriceChange = (closingPricesForAllStocks.map((array) => array[array.length - 1] - array[0])).map((element) => parseFloat(element.toFixed(2)));
-
-    return PriceChange;
+function getPriceChanges(closingPricesForAllStocks)
+{
+    const priceChange = closingPricesForAllStocks.map((array) => array[array.length - 1] - array[0])
+    const result = priceChange.map((element) => parseFloat(element.toFixed(2));
+    return result;
-function getPriceChanges(closingPricesForAllStocks)
-{
-    const PriceChange = (closingPricesForAllStocks.map((array) => array[array.length - 1] - array[0])).map((element) => parseFloat(element.toFixed(2)));
-
-    return PriceChange;
+function getPriceChanges(closingPricesForAllStocks)
+{
+    const priceChange = closingPricesForAllStocks.map((array) => array[array.length - 1] - array[0])
+    const result = priceChange.map((element) => parseFloat(element.toFixed(2));
+    return result;
 }
 
 /*
@@ -63,11 +73,26 @@ function getPriceChanges(closingPricesForAllStocks) {
     The stock ticker should be capitalised.
     The price should be shown with exactly 2 decimal places.
 */
-function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
-}
 
+function highestPriceDescriptions(closingPricesForAllStocks, stocks)
+{
+    let HighestPriceText = [];
+
+    for(let i = 0; i < closingPricesForAllStocks.length; i++)
+    {
+        let AllHighestPrices = 0;
+        for(let i2 = 0; i2 < closingPricesForAllStocks[i].length; i2++)
+        {
+            if(closingPricesForAllStocks[i][i2] > AllHighestPrices)
+            {
+                AllHighestPrices = closingPricesForAllStocks[i][i2];
+            }
+        }
+        HighestPriceText.push("The highest price of " + STOCKS[i].toUpperCase() + " in the last 5 days was " + AllHighestPrices.toFixed(2));
+    }
 
+    return HighestPriceText;
+}
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {
     expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -8,8 +8,19 @@
     Using a loop, complete the function below so it returns the factorial of the number being passed in. 
 */
 
-function factorial(input) {
-    // TODO
+function factorial(input)
+{
+    let OriginalInput = input;
+    let Total = 1;
+    for (let i = 0; i < input; i++)
+    {
+        if(input > 0)
+        {
+            Total *= OriginalInput;
+            OriginalInput--;
+        }
+    }
+    return Total;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */