CodeYourFuture · MarvinLeeMarshall · Jul 14, 2022 · M3ntalist · Jul 14, 2022 · M3ntalist
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -9,12 +9,12 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+// Example 1 - The reason this would return and undefined error is due to the variable 'a' not having a value assigned to it.
 let a;
 console.log(a);
 
 
-// Example 2
+// Example 2 - This would be undefined as the function does not have a parameter.
 function sayHello() {
     let message = "Hello";
 }
@@ -23,14 +23,14 @@ let hello = sayHello();
 console.log(hello);
 
 
-// Example 3
+// Example 3 - This will be undefined as no user has been entered.
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
 
 
-// Example 4
+// Example 4 - This will be undefined as there is no 3rd index.
 let arr = [1,2,3];
 console.log(arr[3]);
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,14 @@
 
 function evenNumbers(n) {
     // TODO
+    let i = 0 
+    const arr = []
+    while (i < n && n > 0){
+        arr.push(i * 2)
+        console.log(arr[i])
+        i++
+    }
+    return arr.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
@@ -18,6 +18,8 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+    const findFirstJulyBDay = birthdays.filter((bDay) => bDay.startWith("July"))
+    return findFirstJulyBDay[0]
 }
 
 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 +8,17 @@
 
 function evenNumbersSum(n) {
     // TODO
+    if (n == 0) return 0
+    let i = 0
+    j = 1
+    sum = 0
+do {
+    i += 2
+    sum += i
+    j++
+}
+while (j < 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 +7,8 @@
 
 // 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 +27,9 @@ 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
@@ -12,5 +12,13 @@ let tubeStations = [
 ];
 
 
+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
@@ -13,6 +13,12 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let temperatureReport = [];
+    for (city of cities) {
+    let cityTemp = temperatureService(city);
+    temperatureReport.push(`The temperature in ${city} is ${cityTemp} degrees`);
+    }
+    return temperatureReport;
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,12 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let x = 0
+    do {
+        x = generateRandomNumber()
+    }
+    while (x <= 50)
+    return x;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,6 +6,7 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter((article) => article.length <= 65)
 }
 
 /*
@@ -15,6 +16,12 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let result = allArticleTitles[0]
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].split(' ').length < result.split(' ').length)
+        result = allArticleTitles[i];
+    }
+    return result 
 }
 
 /*
@@ -24,14 +31,23 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter((article) => article.match(/(\d+)/));
 }
 
 /*
     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 total = 0;
+    for (let title of allArticleTitles) {
+      total += title.length;
+    }
+    let average = total / allArticleTitles.length;
+    return Math.round(average);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,6 +35,19 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let stockPriceAverage = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+      let stockPriceTotal = 0;
+      let stockPrice = closingPricesForAllStocks[i];
+      for (let j = 0; j < stockPrice.length; j++) {
+        stockPriceTotal += stockPrice[j];
+      }
+      stockPriceAverage.push(
+        parseFloat((stockPriceTotal / stockPrice.length).toFixed(2))
+      );
+    }
+    return stockPriceAverage;
+
 }
 
 /*
@@ -49,6 +62,14 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    changedPrice = [];
+    for (const price of closingPricesForAllStocks) {
+      let priceDifference = parseFloat(
+        (price[price.length - 1] - price[0]).toFixed(2)
+      );
+      changedPrice.push(priceDifference);
+    }
+    return changedPrice;
 }
 
 /*
@@ -65,6 +86,17 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let highestPriceForEachStock = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    highestPriceForEachStock.push(
+        `The highest price of ${stocks[
+        i
+        ].toUpperCase()} in the last 5 days was ${Math.max(
+        ...closingPricesForAllStocks[i]
+        ).toFixed(2)}`
+);
+    }
+    return highestPriceForEachStock;
 }