CodeYourFuture · Mehreenaziz · Dec 8, 2022 · Dec 9, 2022 · Dec 9, 2022 · rami1207
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -1,3 +1,4 @@
+
 /*
     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.
@@ -12,6 +13,7 @@
 // Example 1
 let a;
 console.log(a);
+//Answer: variable "a" has not been assigned to a value and therefore not defined
 
 
 // Example 2
@@ -21,6 +23,7 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
+//Answer: a variable has been defined in the function but nothing is being returned from the function and it is therefore undefined.
 
 
 // Example 3
@@ -29,8 +32,11 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
+//Answer: the function has been called without an argument for the user variable, therefore it returns "Hello, undefined".
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+//Answer: there is no value in the array at position 3, as the count starts from
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,19 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let seqN = []; // creating and empty array
+    let i = 0; // create a variable i and assigned 0
+    let count = 0; // create a variable count and assigned 0
+
+    while (count < n) { // created a while loop that specifies while argument is less than variable count, execute the loop
+        seqN.push(i); // pushing i as an element to the array seqN
+        i = i + 2; // we add 2 to variable i
+        count = count + 1; // we add 1 to count, which now reflects the amount of times the loop has been executed, counting from 0
+    }
+
+    console.log(seqN.join()); // seqN array is being joined together as a string and then console logged
 }
 
-evenNumbers(3); // should output 0,2,4
+evenNumbers(3); // should output "0,2,4"
 evenNumbers(0); // should output nothing
-evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
+evenNumbers(10); // should output "0,2,4,6,8,10,12,14,16,18"
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(arrayOfBirthdays) {
+    let i = 0;
+    while (i < arrayOfBirthdays.length) {
+
+        if (arrayOfBirthdays[i].includes("July")) {
+            return arrayOfBirthdays[i]
+
+        }
+
+        i = i + 1;
+    }
 }
 
 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
@@ -7,7 +7,17 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let result = 0;
+    let i = 0;
+
+do {
+  i = i + 1;
+
+  if (i % 2 === 0) {
+    result = result + i;
+  }
+} while (i <= n);
+return result;
 }
 
 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
@@ -6,9 +6,15 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
-    console.log(String.fromCharCode(97 + i));
-    i++;
-}
+// let i = 0;
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
 // The output shouldn't change.
+
+
+for (let i = 0; i < 26; i++) {
+  console.log(String.fromCharCode(97 + i))
+}
+
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -37,3 +37,7 @@ Jane Austen is 41 years old
 Bell Hooks is 63 years old
 Yukiko Motoya is 49 years old
 */
+
+for (let i = 0; i < 5; i++) {
+  console.log(`${WRITERS[i]} is ${AGES[i]} years old`)
+}
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,14 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (const element of tubeStations) {
+  console.log(element);
+}
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (const letter of str) {
+    console.log(letter)
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -11,10 +11,23 @@
         - Hint: you can call the temperatureService function from your function
 */
 
+
+// let citiesArr = ['London', 'São Paulo', 'Paris', 'Barecelona']
+
 function getTemperatureReport(cities) {
-    // TODO
+    let cityWeather = [];
+  for (let i = 0; i < cities.length; i++) {
+    cityWeather.push(
+      `The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`
+    );
+  }
+  return cityWeather;
 }
 
+// console.log(getTemperatureReport('London'))
+
+
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

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

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -1,11 +1,11 @@
 /*
     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
+   return allArticleTitles.filter(items => items.length < 65);
 }
 
 /*
@@ -15,6 +15,11 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let arr = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      arr.push(allArticleTitles[i].split(" ").length);
+    }
+    return allArticleTitles[arr.indexOf(Math.min(...arr))];
 }
 
 /*
@@ -24,6 +29,18 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    // let arrayNum = []
+    // for (let el of ARTICLE_TITLES) {
+    //     for (let ele of el){
+    //     if (ele.includes(Number)) {
+    //         return arrayNum.push(ele.includes(Number));
+    //     }
+    // }
+    //     return arrayNum
+    // }
+     return allArticleTitles.filter((element) =>
+       [...element].find((number) => number >= "0" && number <= "9")
+     );
 }
 
 /*
@@ -32,6 +49,11 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let sum = 0;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      sum += allArticleTitles[i].length;
+    }
+    return Math.round(sum / allArticleTitles.length);
 }
 
 
@@ -78,4 +100,4 @@ test("should only return headlines containing numbers", () => {
 
 test("should return the average number of characters in a headline", () => {
     expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
-});
+});
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -4,7 +4,8 @@
     Imagine we a working for a finance company. Below we have:
         - an array of stock tickers
         - an array of arrays containing the closing price for each stock in each of the last 5 days.
-            For example, CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[2] contains the prices for the last 5 days for STOCKS[2] (which is amzn)
+            For example, CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[2] contains the prices for the last 5 days for
+             STOCKS[2] (which is amzn)
 */
 
 /* ======= Stock data - DO NOT MODIFY ===== */
@@ -23,7 +24,8 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
     Implement the below function, which
         - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input (remember, it's an array of arrays)
         - Returns an array containing the average price over the last 5 days for each stock. 
-            For example, the first element of the resulting array should contain Apple’s (aapl) average stock price for the last 5 days.
+            For example, the first element of the resulting array should contain Apple’s (aapl) average stock 
+            price for the last 5 days.
             The second element should be Microsoft's (msft) average price, and so on.
     The average value should be rounded to 2 decimal places, and should be a number (not a string)
 
@@ -33,9 +35,28 @@ 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 calculateAverage(arr) {
+  let sum = 0;
+  for (let price of arr) {
+    sum += price;
+  }
+  const average = sum / arr.length;
+  return average;
+}
+
+
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+  const myArr = [];
+  for (let stock of closingPricesForAllStocks) {
+    const average = calculateAverage(stock);
+    const formattedAverage = Number(average.toFixed(2));
+    myArr.push(formattedAverage);
+  }
+  return myArr;
 }
+    // TODO
+
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -49,6 +70,15 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+  let myArra = [];
+    for (let price of closingPricesForAllStocks) {
+      let firstDay = price[0];
+      let lastDay = price[price.length - 1];
+      let difference = lastDay - firstDay;
+      myArra.push(Number(difference.toFixed(2)));
+    }
+    return myArra;
+
 }
 
 /*
@@ -65,6 +95,17 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+     let arr = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+      arr.push(
+        `The highest price of ${stocks[
+          i
+        ].toUpperCase()} in the last 5 days was ${Math.max(
+          ...closingPricesForAllStocks[i]
+        ).toFixed(2)}`
+      );
+    }
+    return arr;
 }
 
 

diff --git a/package.json b/package.json
@@ -23,5 +23,8 @@
   "homepage": "https://github.com/CodeYourFuture/JavaScript-Core-1-Coursework-Week3#readme",
   "devDependencies": {
     "jest": "^26.6.3"
+  },
+  "dependencies": {
+    "mandatory": "^1.0.0"
   }
 }