CodeYourFuture · Nikolov87 · Sep 3, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -1,5 +1,5 @@
 /*
-    By now, you would have already seen "undefined", either in an error message or being output from your program.
+        By now, you would have already seen "undefined", either in an error message or being output from your program.
     But what does it mean? undefined represents the absence of a value.
 
     In some cases, undefined will be used by a programmer intentionally, and they will write code to handle it.
@@ -12,6 +12,7 @@
 // Example 1
 let a;
 console.log(a);
+//"a" is not set to any value
 
 
 // Example 2
@@ -21,16 +22,17 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
-
+//the function doesn't return any value 
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
-
+//is not declared the variables
 sayHelloToUser();
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+//index start from 0, this mean in "(arr[])" should be 2, not 3
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,13 @@
 
 function evenNumbers(n) {
     // TODO
+    let array = []
+    let i = 0;
+    while (i < n) {
+       array.push(i * 2);
+       i++;
+    }
+    console.log(array.toString());
 }
 
 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
@@ -17,7 +17,16 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
+    let i = 0;
+    while (i < birthdays.length) {
+        if (birthdays[i].includes("July")) {
+            return birthdays[i];
+        }
+         i++;
+    }
+
     // TODO
 }
 
 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 +6,17 @@
     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(number) {
+    let sum = 0;
+let i = 0;           
+do {
+    sum = i * (i + 1);  
+i++;
+} while (i < number);
+return sum;
 }
 
+
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
 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 +6,9 @@
 
 
 // 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
@@ -26,7 +26,9 @@ const AGES = [
     49
 ];
 
-// TODO - Write for loop code here
+    for (let i = 0; i < AGES.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
@@ -14,3 +14,7 @@ let tubeStations = [
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (let char of str) {
+    console.log(char.toUpperCase());
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -12,7 +12,13 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let arr = [];
+    for (const element of cities) {
+        if (temperatureService(element)) {
+           arr.push(`The temperature in ${element} is ${temperatureService(element)} degrees`);
+        } 
+    } return arr;
+
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -10,8 +10,11 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
-}
+    do {
+        value =  generateRandomNumber();
+     } while( value <= 50)
+     return value;
+    } 
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -5,7 +5,12 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let arr = [];
+    for (const element of allArticleTitles) {
+        if (element.length <= 65) {
+            arr.push(element);
+        }
+    }return arr;
 }
 
 /*

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -34,7 +34,18 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+    let total = 0;
+    let average = 0;
+    arrayOfAverages = [];
+    for (const subArray of closingPricesForAllStocks) {
+        for (const element of subArray) {
+            total = total + element;
+        }
+        average = total / subArray.length;
+        total = 0;        
+        arrayOfAverages.push(Math.round(average *100)/100);
+    }
+    return arrayOfAverages;
 }
 
 /*
@@ -48,7 +59,15 @@ 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 priceDifference = 0;
+    let arrayOfChanges = [];
+    for (const subArray of closingPricesForAllStocks) {
+
+        priceDifference = Math.round((subArray[subArray.length -1] - subArray[0]) * 100) /100;
+        arrayOfChanges.push(priceDifference);
+    }
+
+    return arrayOfChanges;
 }
 
 /*
@@ -64,7 +83,17 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let highestPriceEach = 0;
+    let arrayOfPrices = [];
+    let i = 0;
+    for (const subArray of closingPricesForAllStocks) {
+
+            highestPriceEach = Math.max(...subArray).toFixed(2);
+            arrayOfPrices.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPriceEach}`);
+            i++
+
+    }
+    return arrayOfPrices;
 }