CodeYourFuture · Junitalama · Mar 5, 2023 · Mar 5, 2023 · Mar 6, 2023 · Mar 6, 2023
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -13,24 +13,34 @@
 let a;
 console.log(a);
 
+//// a has been declared without value
+
 
 // Example 2
 function sayHello() {
     let message = "Hello";
+
 }
 
 let hello = sayHello();
 console.log(hello);
 
+// function sayHello has been declared without return value
+
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
+// function sayHelloToUser is being called without an argument
+
+
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+// arr [3] doesn't have a value.
diff --git a/1-exercises/B-array-literals/exercise.js b/1-exercises/B-array-literals/exercise.js
@@ -3,9 +3,9 @@
   --------------
   Declare some variables assigned to arrays of values
 */
+let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+let mentors = ["Daniel", "Irina", "Rares"];
 
-let numbers = []; // add numbers from 1 to 10 into this array
-let mentors; // Create an array with the names of the mentors: Daniel, Irina and 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
@@ -4,12 +4,16 @@
   Complete the functions below to get the first and last values from the array
 */
 
-function first(arr) {
-  return; // complete this statement
+function first(numbers) {
+  return numbers[0]; // complete this statement
 }
 
-function last(arr) {
-  return; // complete this statement
+function last(numbers) {
+  return numbers[numbers-1];// complete this statement
+}
+
+function last(names) {
+  return names[names.length-1];
 }
 
 /* 

diff --git a/1-exercises/C-array-get-set/exercises2.js b/1-exercises/C-array-get-set/exercises2.js
@@ -7,7 +7,8 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
-
+numbers.push(4);
+numbers[0] = 1;
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */

diff --git a/1-exercises/D-for-loop/exercise.js b/1-exercises/D-for-loop/exercise.js
@@ -10,23 +10,24 @@
     Using a for loop, output to the console a line about the age of each writer.
 */
 
-const WRITERS = [
+const writers = [
     "Virginia Woolf",
     "Zadie Smith",
     "Jane Austen",
     "Bell Hooks",
     "Yukiko Motoya"
 ]
 
-const AGES = [
+const ages = [
     59,
     40,
     41,
     63,
     49
 ];
-
-// 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
@@ -4,7 +4,7 @@
     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 = [
+const birthdays = [
     "January 7th",
     "February 12th",
     "April 3rd",
@@ -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"
+console.log(findFirstJulyBDay(birthdays)); // should output "July 11th"
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -12,7 +12,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let cityWeather = [];
+    for (let city of cities){
+        cityWeather.push(`The temperature in ${city} is ${temperatureService(city)} degrees`);
+    }
+return cityWeather; 
 }
 
 

diff --git a/2-mandatory/2-financial-times.js b/2-mandatory/2-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 titleCharacters = [];
+     for(let title of allArticleTitles) {
+        if(title.length <= 65) {
+            titleCharacters.push(title);
+        }
+     }
+return titleCharacters;
 }
 
 /*
@@ -14,24 +20,53 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let shortestHeadline;
+    let fewestNumberOfWords;
+    for(let title of allArticleTitles){
+        let numberOfWords = title.split(' ').length;
+        if (fewestNumberOfWords === undefined || numberOfWords < fewestNumberOfWords){
+            fewestNumberOfWords=numberOfWords;
+            shortestHeadline = title;
+        }
+    }
+return shortestHeadline;
 }
 
+
 /*
     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 containsNumbers(str) {
+  return /[0-9]/.test(str);
+}
+
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+  let titlesWithNumbers = [];
+
+  for(let title of allArticleTitles){
+        if (containsNumbers(title)== true) {
+            titlesWithNumbers.push(title); 
+        }
+
+  }
+
+return titlesWithNumbers;
 }
 
 /*
     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 countAllWords = 0;
+ let noOfArticles = allArticleTitles.length;
+ for(let title of allArticleTitles){
+   countAllWords = countAllWords + title.length;
+ }
+ let averageWords = Math.round(countAllWords/noOfArticles);
+ return averageWords;
 }
 
 

diff --git a/2-mandatory/3-stocks.js b/2-mandatory/3-stocks.js
@@ -34,8 +34,21 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+ let averagePrices = [];
+  for(let item of closingPricesForAllStocks){
+   let sum = 0;
+   let average = 0;
+        for(let i of item) {
+            sum +=i;
+        }
+
+       average = Math.round(sum/item.length *100)/100;
+       averagePrices.push(average);
+    }
+return averagePrices;
+
 }
+
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -48,7 +61,14 @@ 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
+    let priceChange = [];
+    for(let item of closingPricesForAllStocks){
+        let firstDayPrice = item[0];
+        let lastDayPrice = item[item.length-1];
+        priceChange.push(Math.round((lastDayPrice - firstDayPrice)*100)/100);
+
+    }
+return priceChange;   
 }
 
 /*
@@ -64,10 +84,20 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let report = [];
+    let highestPrice = 0;
+    let stock = 0;
+    for (let item of closingPricesForAllStocks) {
+        highestPrice = Math.max(...item).toFixed(2);
+        report.push(`The highest price of ${stocks[stock].toUpperCase()} in the last 5 days was ${highestPrice}`);
+        stock++;
+    }
+return report; 
 }
 
 
+
+
 /* ======= 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-radio-stations.js b/3-extra/1-radio-stations.js
@@ -13,7 +13,13 @@
  * - Should return this array to use in other functions
  */
 
-// `getAllFrequencies` goes here
+function getAllFrequencies(){
+  let listOfFrequencies = [];
+  for (let i =87; i<=108; i++) {
+    listOfFrequencies.push(i);
+   }
+return listOfFrequencies;
+}
 
 /**
  * Next, let's write a function that gives us only the frequencies that are radio stations.
@@ -24,7 +30,15 @@
  * - There is a helper function called isRadioStation that takes an integer as an argument and returns a boolean.
  * - Return only the frequencies that are radio stations.
  */
-// `getStations` goes here
+function getStations(){
+  let stations = [];
+  for (let item of getAllFrequencies()){
+    if(isRadioStation (item)){
+      stations.push(item);
+    }
+  }
+  return stations;
+}
 
 /*
  * ======= TESTS - DO NOT MODIFY =======