CodeYourFuture · Ezgi3406 · Jan 13, 2022 · jstadnik · Jan 16, 2022 · hachi-ops
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -10,11 +10,15 @@
 */
 
 // Example 1
+// declare the variable a but we haven’t assign yet
+
+let a;
 let a;
 console.log(a);
 
 
 // Example 2
+// undefined is the return value of functions which don’t return a value 
 function sayHello() {
     let message = "Hello";
 }
@@ -24,6 +28,7 @@ console.log(hello);
 
 
 // Example 3
+// parameters for which no value is passed to the function it is undefined to.
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
@@ -32,5 +37,6 @@ sayHelloToUser();
 
 
 // Example 4
+// Array elements that do not have a value to undefined
 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
@@ -7,8 +7,17 @@
 
 function evenNumbers(n) {
     // TODO
+    let even=[]
+    let i =0
+
+    while(even.length<n){
+        even.push(i);
+        i+=2;
+
+    }return even;
 }
 
-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
+
+console.log(evenNumbers(3)); // should output 0,2,4
+console.log(evenNumbers(0)); // should output nothing
+console.log(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 +16,6 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
-function findFirstJulyBDay(birthdays) {
-    // TODO
-}
+const findFirstJulyBDay = BIRTHDAYS.find(e=>e.includes('July'));
+console.log(findFirstJulyBDay);
 
-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
@@ -7,8 +7,16 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
-}
+    let startNumber = 0;
+    let sum = 0;
+    do {
+      sum += startNumber * 2;
+      startNumber++;
+    } while (startNumber < n);
+    return sum;
+  }
+
+
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0

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
@@ -27,6 +27,14 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for (var 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
@@ -10,7 +10,19 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
+for(let 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(let element of str){
+    const myArr=str.toUpperCase().split('');
+    console.log(myArr);
+
+}
+
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -13,9 +13,17 @@
 
 function getTemperatureReport(cities) {
     // TODO
+  let cityWithTemperature = [];
+  for (let i = 0; i < cities.length; i++) {
+    let currentCity = cities[i];
+    let currentCityTemperature = temperatureService(currentCity);
+    cityWithTemperature.push(
+      `The temperature in ${currentCity} is ${currentCityTemperature} degrees`
+    );
+  }
+  return cityWithTemperature;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -8,10 +8,13 @@ function generateRandomNumber() {
     console.log("Generating number...");
     return Math.round(Math.random() * 100);
 }
-
-function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
-}
+  function getRandomNumberGreaterThan50() {
+    let randomNum;
+    do {
+      randomNum = generateRandomNumber();
+    } while (randomNum <= 50);
+    return randomNum;
+  }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,6 +6,8 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+   return allArticleTitles.filter((element) => element.length <= 65);
+
 }
 
 /*
@@ -15,7 +17,31 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
-}
+    let shortestTitleLength = Infinity;
+        return allArticleTitles.reduce((acc, title) => {
+          const titleLengthInWords = title.split(" ").length;
+          if (titleLengthInWords < shortestTitleLength) {
+            shortestTitleLength = titleLengthInWords;
+            return title;
+          } else {
+            return acc;
+          }
+        }, "");
+      }
+    //   function headlinesWithNumbers(allArticleTitles) {
+        //input is an array
+        //only return array entries that have numbers in
+        //return an array
+        //   return allArticleTitles.filter((title) => {
+        //     const matches = title.match(/\d/);
+        //     if (matches !== null) {
+        //       return true;
+        //     } else {
+        //       return false;
+        //     }
+        //   });
+
+// }
 
 /*
     The editor of the FT has realised that headlines which have numbers in them get more clicks!
@@ -24,14 +50,31 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
-}
+    const titlesToReturn = [];
+        const numbers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
+        allArticleTitles.forEach((title) => {
+          title.split("").forEach((character) => {
+            if (numbers.includes(character)) {
+              titlesToReturn.push(title);
+            }
+          });
+        });
+        return titlesToReturn;
+      }
+
 
 /*
     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 totalCharacterNumber = 0;
+  for (let i = 0; i < allArticleTitles.length; i++) {
+    totalCharacterNumber =
+      totalCharacterNumber + allArticleTitles[i].split("").length;
+  }
+  return Math.round(totalCharacterNumber / allArticleTitles.length);
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,7 +35,22 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
-}
+
+        return closingPricesForAllStocks.map((value, index) => {
+            let sum = 0, counter = 0;
+
+            for (let item of value) {
+                sum += item;
+                counter++;
+            }
+            average = parseFloat((sum/counter).toFixed(2))
+
+            console.log(average);
+            return average;
+        })
+    }
+
+
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -49,6 +64,14 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    let priceDiffArr=[];
+
+    for(let price of closingPricesForAllStocks){
+
+        let priceDiff=Number(price[price.length-1]-price[0])
+        priceDiffArr.push(parseFloat(priceDiff.toFixed(2)))
+    }
+    return priceDiffArr;
 }
 
 /*
@@ -65,6 +88,14 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let highestPriceByCompany = [];
+    for( let i = 0; i < closingPricesForAllStocks.length; i++ ){
+         let highestPrice = Math.max(...closingPricesForAllStocks[i]).toFixed(2);    
+         highestPriceByCompany.push(
+           `The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${highestPrice}`
+         );     
+    }
+    return highestPriceByCompany;  
 }
 
 

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -10,8 +10,16 @@
 
 function factorial(input) {
     // TODO
+    for (let i = input-1; i >=1; i--){
+        input = input* i;
+        console.log(input) 
+    }
+    return input;
+
 }
 
+
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("3! should be 6", () => {

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -12,6 +12,16 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+    let bookTitles=[];
+    for(let i=0; i<books.length; i++){
+        if(books[i].rating > 4.8){
+         bookTitles.push(books[i].title)   
+        }
+
+    }
+return bookTitles;
+
+
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -15,8 +15,19 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+
+    let fibonacci = [0, 1];
+    for(i = 2; i < n; i++) {
+        let y = fibonacci[i-2] + fibonacci[i-1]; 
+        fibonacci.push(y);
+    }
+
+
+  return fibonacci;
 }
 
+
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the first 10 numbers in the Fibonacci Sequence", () => {
     expect(generateFibonacciSequence(10)).toEqual(