CodeYourFuture · softacoder · Feb 28, 2023 · Mar 1, 2023 · Mar 5, 2023 · Mar 5, 2023
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -13,24 +13,31 @@
 let a;
 console.log(a);
 
+// There is no values assigned. Therefore undefined
+
 
 // Example 2
 function sayHello() {
     let message = "Hello";
+// there is no return to call the function. Therefore undefined
 }
 
 let hello = sayHello();
 console.log(hello);
 
 
+
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+// There is no data in th brackets. Therefore undefined
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+//this array contain 3 items but the index start from 0 and will display until index[2]=3
+console.log(arr[2]);
diff --git a/1-exercises/B-array-literals/exercise.js b/1-exercises/B-array-literals/exercise.js
@@ -4,9 +4,9 @@
   Declare some variables assigned to arrays of values
 */
 
-let numbers = []; // add numbers from 1 to 10 into this array
+let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; // add numbers from 1 to 10 into this array
 let mentors; // Create an array with the names of the mentors: Daniel, Irina and Rares
-
+let mentors = ["Daniel", "Irina", "Rares"];
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */

diff --git a/1-exercises/C-array-get-set/exercise.js b/1-exercises/C-array-get-set/exercise.js
@@ -5,11 +5,11 @@
 */
 
 function first(arr) {
-  return; // complete this statement
+  return arr[0]; //if you assume it is a number array counting start at 0
 }
 
 function last(arr) {
-  return; // complete this statement
+  return arr[arr.lenght-1]; //you have an array and want the value of its array length 
 }
 
 /* 

diff --git a/1-exercises/C-array-get-set/exercises2.js b/1-exercises/C-array-get-set/exercises2.js
@@ -7,6 +7,8 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
+numbers.push("4");
+// https://www.w3schools.com/jsref/jsref_push.asp
 
 /* 
   DO NOT EDIT BELOW THIS LINE

diff --git a/1-exercises/D-for-loop/exercise.js b/1-exercises/D-for-loop/exercise.js
@@ -28,6 +28,11 @@ 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/E-while-loop-with-array/exercise.js b/1-exercises/E-while-loop-with-array/exercise.js
@@ -18,6 +18,15 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+    let i = 0;
+    while(i < birthdays.length){
+        if(birthdays[i].startsWith('July')){
+            return birthdays[i];
+        }
+        i++
+    }
 }
 
+// https://www.w3schools.com/jsref/jsref_startswith.asp
+
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -13,8 +13,23 @@
 
 function getTemperatureReport(cities) {
     // TODO
-}
 
+const temperatureReport = [];
+
+    for(let i = 0; i < cities.length; i++) {
+        const temperature = temperatureService(cities[i]);
+
+        temperatureReport.push(`The temperature in ${cities[i]} is ${temperature} degrees`);
+    }
+
+    return temperatureReport;
+}
+// I start with a function getTemperatureReport.
+// It has an array cities as parameter. Then a const variable equals to an empty array. A for loop is used to iterate 
+// over each city in the cities array. During each iteration, the temperatureService function is called with the current
+//  city as its argument to get the current temperature of that city. This temperature is then stored in a temperature 
+// variable. Finally, a string is constructed using template literals and the current city and temperature, and this string
+//  is added to the temperatureReport array using the push() method. After all cities have been processed, the temperatureReport array is returned by the function.
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

diff --git a/2-mandatory/2-financial-times.js b/2-mandatory/2-financial-times.js
@@ -4,37 +4,92 @@
     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
+    const headlines = [];
+    for (let articleTitle of allArticleTitles) {
+        if (articleTitle.length <= 65) {
+            headlines.push(articleTitle);
+        }
+    }
+    return headlines;
 }
 
+//I start with the function potentailHeadlines with an array argument. Inside the brakcets I have a local variable headlines
+// that equals and empty array. It is used to the for ... if loop. It checks one article of all articles you see declared in
+// the function. Then i have brackets with if and check the articles titles length is 65 or less. Next the .push method 
+// push the headlines. Then I use return the headlines.
+
+
 /*
     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
+    let shortestHeadlines = allArticleTitles[0];
+    // console.log(allArticleTitles[0])
+    for (let i = 1; i < allArticleTitles.length; i++) {
+        let currentTitle = allArticleTitles[i];
+        if (currentTitle.length < shortestHeadlines.length) {
+            shortestHeadlines = currentTitle  
+        }
+    }
+    return shortestHeadlines;
 }
-
+// I start with a function that want to find a title with fewest words. I have an array as a parameter. Inside the brackets
+// I use a let variable shortestHeadlines that equals allArticleTitles with counting from zero. I use a for... if loop with a
+// let variable i equals 1, if i is less than the length of allArticleTitles, i count 1. Then I have a let variable currentTitle
+// that equals allArticleTitles and the if statement that check if length of the currentTitle to shortestHeadlines then 
+// shortestHeadlines equals currentTitles. Then I return the variable for the function.  
 /*
     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
-}
+  let newArr = [];
+  for (let title of allArticleTitles) {
+    if (/[0-9]/.test(title) === true) {
+      newArr.push(title);
+    }
+  }
 
+  return newArr;
+}
+// I start with a function headlineWithNumbers with an array checking all article titles. Inside the brackets I have a let variable
+// with a new array to store article titles that contain at least a number. Then I use a for ... if loop that have let variable to
+// I use .test method to check for digits from 0 - 9. If there are at least a digit it return true and a title is added to newArr and
+// push to containing all articles with at least a number. 
+// 
 /*
     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 averageCharacter = 0;
+    let numberOfArticles = 0;
+    for (let articleTitle of allArticleTitles) {
+        averageCharacter += articleTitle.length;
+        numberOfArticles += 1;
+    }
+    return Math.round(averageCharacter / numberOfArticles);
 }
-
-
+// I start with a function that look for average number of characters with the array allArticleTitles as arguments. I use two let 
+// variables and both equals 0. I use a for loop with a variable that check article title of all article titles. Inside the innerbracket
+// I check if average character is article title with the length method. Then number of articles += 1. I return with .round method
+// and divide the two let variables averageCharacters and numberOfArticles.
 
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [

diff --git a/2-mandatory/3-stocks.js b/2-mandatory/3-stocks.js
@@ -33,10 +33,34 @@ 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
+
+  let arrayWithAveragePrices = [];
+
+  for (let arrayWithPrices of closingPricesForAllStocks) {
+    arrayWithAveragePrices.push(findAveragePrice(arrayWithPrices));
+  }
+  return arrayWithAveragePrices;
 }
 
+function findAveragePrice(array) {
+  let sum = 0;
+  for (let price of array) {
+    sum += price;
+  }
+  return Number((sum / array.length).toFixed(2));
+}
+ // I start with a function getAveragePrice and use an array as a parameter. Inside the brackets, I have a let variable arrayWithAveragePrices
+//  that equals to an empty array that we fill later in the code. I use a for loop and in the lopp I have a let variable with two
+// parameters arrayWithPrices / closingPricesForStocks. Inside the second bracket, I have arrayWithAveragePrices with a push method
+// I findAveragePrices from arrayWithPrices. Then I return the function and it match let variable arrayWithAveragePrices. 
+
+// I start with a function findAveragePrice and have array as parameter. Inside the brackets I use a let variable sum equals to 0.
+// I use a for loop that has a let variable with two parameters price / array. The second bracket, I have sum += price. Then I return
+// Number that will be the sum divided by the array and use the .toFixed method that specifies I have two decimals.
 /*
     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
@@ -47,9 +71,20 @@ 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
+      let changedPrices = [];
+  for (let arrayWithPrices of closingPricesForAllStocks) {
+    let changedPrice = arrayWithPrices[arrayWithPrices.length - 1] - arrayWithPrices[0];
+    changedPrices.push(Number(changedPrice.toFixed(2)));
+  }
+  return changedPrices;
 }
+// I start with a function getPriceChanges and have an array as my parameter. Inside the brickets I have a let variable that equals
+// an empty array. I use for loop and start with a let variable arrayWithPrices of ... . Then i do a bracket inside the first bracket
+// which means the let variable only execute 'til its closing bracket. It checks changedPrice equals arrayWithPrices that has its own 
+// array were I use the length method minus 1 minus arrayWithPrices start from 0. The changedPrice is pushed and price has two decimals
+// which is achieved by using the .toFixed method.
 
 /*
     As part of a financial report, we want to see what the highest price was for each stock in the last 5 days.
@@ -65,7 +100,21 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
-}
+    let arrayWithStrings = [];
+    for (let i = 0; i < stocks.length; i++) {
+        let stockOfName = stocks[i].toUpperCase();
+        let sortedArray = closingPricesForAllStocks[i].sort(function (a, b) {
+            return a-b});
+            let highestPrice = sortedArray[sortedArray.length -1];
+            let convertedPrice = highestPrice.toFixed(2);
+            arrayWithStrings.push(`The highest price of ${stockOfName} in the last 5 days was ${convertedPrice}`);
+
+        }
+        return arrayWithStrings;
+        // http://www.collectionsjs.com/sorted-array
+
+    }
+
 
 
 /* ======= TESTS - DO NOT MODIFY ===== */