CodeYourFuture · elahemortazavi · Dec 5, 2022 · Dec 7, 2022 · Bahare09 · Dec 16, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -12,25 +12,28 @@
 // Example 1
 let a;
 console.log(a);
-
+//a has not defined.
 
 // Example 2
 function sayHello() {
     let message = "Hello";
 }
+//no parameter  
 
 let hello = sayHello();
 console.log(hello);
-
+//sayhello() function will not return anything.
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+//no argument in envoked function
 
 // Example 4
+
 let arr = [1,2,3];
 console.log(arr[3]);
+//no 4th element
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 number = 0;
+    let output = [];
+    while (n > 0){
+        output.push(number);
+        number += 2;
+        n--;
+    }
+    output = output.join(',');
+    console.log(output);
+
 }
 
+
 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
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -16,8 +16,28 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
+// function findFirstJulyBDay(birthdays) {
+//     let i = 0;
+
+//     while(i < birthdays.length){
+//         if(birthdays[i].includes("july")) {
+//             return birthdays[i];
+//         }
+//         i++;
+//     }
+
+// }
+
+
 function findFirstJulyBDay(birthdays) {
     // TODO
+    let currentIndex = 0;
+    while (currentIndex < birthdays.length) {
+      if (birthdays[currentIndex].includes("July")) {
+        return birthdays[currentIndex];
+      }
+      currentIndex++;
+    }
 }
 
 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 +7,14 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let number = 0;
+     let sum = 0;
+     do {
+       sum += number;
+       number += 2;
+       n--;
+     } while (n > 0);
+     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
@@ -6,9 +6,14 @@
 
 
 // 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++;
-}
+
 // The output shouldn't change.
+// let i = 0;
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
+
+for (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
@@ -27,7 +27,9 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+for (i = 0; i <= 5; 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
@@ -8,9 +8,15 @@ let tubeStations = [
     "Baker Street",
     "Picadilly Circus",
     "Oxford Street",
-    "Tottenham Court Road"
+    "Tottenham Court Road",
 ];
-
+for (let i of tubeStations) {
+  console.log(i);
+}
 
 // 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
@@ -13,6 +13,11 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let result = [];
+  for (let i = 0; i < cities.length; i++) {
+      result.push(`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`);
+  }
+  return result;
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,18 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    //  let number = generateRandomNumber();
+    // do {
+    //   number = generateRandomNumber();
+    // } while (number < 50);
+    // return number;
+
+
+   let n;
+  do {
+    n = generateRandomNumber();
+  } while (n < 50);
+  return n;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,6 +6,17 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+//     let newArr = [];
+//     for(let i of allArticleTitles) {
+//         if(allArticleTitles.length <= 65){
+//             newArr.push(allArticleTitles[i]);
+//         }
+//     }
+//     return newArr;
+// }
+
+
+     return allArticleTitles.filter(items => items.length < 65);
 }
 
 /*
@@ -15,6 +26,11 @@ 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 +40,32 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    //  let newArr = []
+    // for (let i of ARTICLE_TITLES) {
+    //     for (let el of i){
+    //     if (el.includes(Number)) {
+    //         return newArr.push(el.includes(Number));
+    //     }
+    // }
+    //     return newArr;
+    // }
+
+// second solution
+
+     let NumberArray = []
+    const regex = /[0-9]/g;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].search(regex) >= 0) { NumberArray.push(allArticleTitles[i]) }
+    }
+    return NumberArray
+
+
+
+// third solution
+
+    //  return allArticleTitles.filter((element) =>
+    //    [...element].find((number) => number >= "0" && number <= "9")
+    //  );
 }
 
 /*
@@ -32,6 +74,11 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let total = 0;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      total += allArticleTitles[i].length;
+    }
+    return Math.round(total / allArticleTitles.length);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -33,8 +33,27 @@ 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 total = 0;
+  for (let price of arr) {
+    total += price;
+  }
+  const average = total / 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;
+
+
 }
 
 /*
@@ -49,6 +68,14 @@ 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 +92,17 @@ 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/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -10,6 +10,11 @@
 
 function factorial(input) {
     // TODO
+      let sum = 1
+    for (i = 1; i <= input; i++){
+         sum *= i 
+    }
+    return sum
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -12,6 +12,22 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+    const result = books.reduce((acc, cur) => {
+      const groupByGenre = cur.genre;
+      if (!acc[groupByGenre]) {
+        acc[groupByGenre] = [];
+      }
+      acc[groupByGenre].push(cur);
+      return acc;
+    }, {});
+    const genreName = Object.keys(result);
+    const arr = [];
+    for (let i = 0; i < genreName.length; i++) {
+      arr.push(
+        result[genreName[i]].sort((a, b) => b.rating - a.rating)[0].title
+      );
+    }
+    return arr;
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -15,6 +15,11 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+     let fibo = [0, 1];
+    for (let i = 0; i < n - 2; i++) {
+      fibo.push(fibo[i] + fibo[i + 1]);
+    }
+    return fibo;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */