CodeYourFuture · sasarkarimi · Sep 23, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -12,6 +12,7 @@
 // Example 1
 let a;
 console.log(a);
+//here by console.log we can print a's value. (a) has declared but has not initialized so it will return undefined.
 
 
 // Example 2
@@ -21,16 +22,17 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
-
+//because this function doesn't return message
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+//function call has no argument
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+//there is no element at index 3
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,16 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+	const even = [0, 2, 4, 6, 8, 10, 12, 14, 16, 18];
+
+	let string = "";
+	let count = 0;
+	while (count < n) {
+		string += `${even[count]},`;
+		count++;
+	}
+
+	console.log(string);
 }
 
 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
@@ -5,19 +5,23 @@
 */
 
 const BIRTHDAYS = [
-    "January 7th",
-    "February 12th",
-    "April 3rd",
-    "April 5th",
-    "May 3rd",
-    "July 11th",
-    "July 17th",
-    "September 28th",
-    "November 15th"
+	"January 7th",
+	"February 12th",
+	"April 3rd",
+	"April 5th",
+	"May 3rd",
+	"July 11th",
+	"July 17th",
+	"September 28th",
+	"November 15th",
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+	let count = 0;
+	while (count < birthdays.length) {
+		if (birthdays[count].includes("July")) return birthdays[count];
+		count++;
+	}
 }
 
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+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
+	const even = [0, 2, 4, 6, 8, 10, 12, 14, 16, 18];
+
+	let string = "";
+	let count = 0;
+
+	do {
+		string += `${even[count]},`;
+		count++;
+	} while (count < n);
+
+	return string;
 }
 
 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 +6,7 @@
 
 
 // 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++;
+for (let i = 0; i < 26; i++) {
+	console.log(String.fromCharCode(97 + i));
 }
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -11,29 +11,24 @@
 */
 
 const WRITERS = [
-    "Virginia Woolf",
-    "Zadie Smith",
-    "Jane Austen",
-    "Bell Hooks",
-    "Yukiko Motoya"
-]
-
-const AGES = [
-    59,
-    40,
-    41,
-    63,
-    49
+	"Virginia Woolf",
+	"Zadie Smith",
+	"Jane Austen",
+	"Bell Hooks",
+	"Yukiko Motoya",
 ];
 
-// TODO - Write for loop code here
+const AGES = [59, 40, 41, 63, 49];
+
+for (let i = 0; i < WRITERS.length; i++) {
+	console.log(`${WRITERS[i]} is ${AGES[i]} years old`);
+}
 
 /*
 The output should look something like this:
-
 Virginia Woolf is 59 years old
 Zadie Smith is 40 years old
 Jane Austen is 41 years old
 Bell Hooks is 63 years old
 Yukiko Motoya is 49 years old
-*/
+*/
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
@@ -4,13 +4,20 @@
 
 // TODO Use a for-of loop to output each of the tube stations below.
 let tubeStations = [
-    "Aldgate",
-    "Baker Street",
-    "Picadilly Circus",
-    "Oxford Street",
-    "Tottenham Court Road"
+	"Aldgate",
+	"Baker Street",
+	"Picadilly Circus",
+	"Oxford Street",
+	"Tottenham Court Road",
 ];
 
+for (let item of tubeStations) {
+	console.log(item);
+}
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (let item of str) {
+	console.log(item.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 report = [];
+
+
+    for (let i = 0; i < cities.length; i++) {
+      report[i] = `The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`;
+    }
+    return report;
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -11,8 +11,13 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let counter = 0; 
+
+    do {
+      counter = generateRandomNumber();
+    } while ( counter<=50);
+    return counter;
 }
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("Returned value should always be greater than 50", () => {

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -5,7 +5,11 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    if (allArticleTitles.length !== 0 ){
+        allArticleTitles = ARTICLE_TITLES.filter((el) => el.length <=65)
+        return allArticleTitles;
+    }
+      else return (allArticleTitles=[]);  
 }
 
 /*
@@ -14,7 +18,16 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+   for(let i = 0 ; i <allArticleTitles.length ;i++){
+    for (let j = i + 1 ; j < allArticleTitles.length;j++){
+        if (allArticleTitles [i].length> allArticleTitles[j].length){
+            let sahar = allArticleTitles [i];
+            allArticleTitles[i]=allArticleTitles[j];
+            allArticleTitles[j] = sahar ;
+        }
+    }
+   }
+   return allArticleTitles[0];
 }
 
 /*
@@ -24,14 +37,21 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter((element) => {
+        return /\d/.test(element);
 }
 
 /*
     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 sum = 0;
+
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      sum = sum + allArticleTitles[i].length;
+    }
+    return Math.round(sum / allArticleTitles.length);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -1,6 +1,5 @@
 /*
-    THESE EXERCISES ARE QUITE HARD. JUST DO YOUR BEST, AND COME WITH QUESTIONS IF YOU GET STUCK :)
-
+     THESE EXERCISES ARE QUITE HARD. JUST DO YOUR BEST, AND COME WITH QUESTIONS IF YOU GET STUCK :)
     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.
@@ -26,15 +25,20 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
             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)
-
     Hint 1: To calculate the average of a set of values, you can add them together and divide by the number of values.
         So the average of 5, 10 and 20 is (5 + 10 + 20) / 3 = 11.67
     Hint 2: If the problem seems complex, try breaking it down into smaller problems.
         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
+      return closingPricesForAllStocks.map(
+        (element) =>
+          +(
+            element.reduce((total, len) => total + len) / element.length
+          ).toFixed(2)
+      );
+
 }
 
 /*
@@ -49,6 +53,8 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+
+    return closingPricesForAllStocks.map((element)=>+(element[4]-element[0]).toFixed(2));
 }
 
 /*
@@ -64,7 +70,15 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+
+    let highPrice=[];
+
+    stocks.forEach((stock,item) => {
+        highPrice.push(
+          `The highest price of ${stock.toUpperCase()} in the last 5 days was ${Math.max(...closingPricesForAllStocks[item]).toFixed(2)}`
+        );
+    });
+    return highPrice;
 }
 
 
@@ -91,4 +105,4 @@ test("should return a description of the highest price for each stock", () => {
             "The highest price of TSLA in the last 5 days was 1101.30"
         ]
     );
-});
+});