CodeYourFuture · Monika39-maker · Jan 14, 2022 · Feb 2, 2022 · teniolao · Jan 21, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -13,14 +13,17 @@
 let a;
 console.log(a);
 
+//Answer: Because a has not been assigned any value
 
 // Example 2
 function sayHello() {
     let message = "Hello";
 }
 
+
 let hello = sayHello();
 console.log(hello);
+//Answer: Because the function is not returning anything
 
 
 // Example 3
@@ -29,8 +32,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
+//Answer: Because no arguement has been passed inside the function when calling it
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+//Answer: Because the arr has 3 elements in it. So arr[3] means 4th element which is not present in the arr
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,20 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let i = 0;
+    let evenNumberArray = []
+    while (evenNumberArray.length < n) {
+        if (i%2 === 0) {
+            let strNum = i.toString()
+            evenNumberArray.push(strNum);
+        }
+
+        i++
+    }
+
+    return evenNumberArray.join(',')
+
 }
-
-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
@@ -17,7 +17,11 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    for (let i = 0; i< birthdays.length; i++) {
+        if (birthdays[i].includes("July")) {
+            return birthdays[i]
+        }
+    }
 }
 
 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 +7,18 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let currentNum = 0;
+    let evenNumArr = [];
+
+    do {
+        if (currentNum%2 === 0 ) {
+            evenNumArr.push(currentNum)
+
+        } 
+        currentNum += 1;
+
+    } while (evenNumArr.length < n)
+    return evenNumArr.reduce((prevNum, num) => {return prevNum+num})
 }
 
 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 +6,8 @@
 
 
 // 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
@@ -28,6 +28,11 @@ const AGES = [
 
 // TODO - Write for loop code here
 
+
+for (let writerIndex = 0 ; writerIndex<WRITERS.length; writerIndex++) {
+    console.log(`${WRITERS[writerIndex]} is ${AGES[writerIndex]} 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 +10,14 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
+for (let station of tubeStations) {
+    console.log(station)
+}
 
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let letter of str) {
+    let capLetter = letter.toLocaleUpperCase()
+    console.log(capLetter)
+}
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 tempDetailArr = []
+    for (let cityName of cities) {
+        const cityTemp = temperatureService(cityName)
+        const tempDetail =  `The temperature in ${cityName} is ${cityTemp} degrees`
+        tempDetailArr.push(tempDetail)
+    }
+    return tempDetailArr
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -10,7 +10,13 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+    let randNumber = ''
+    do {
+        generateRandomNumber()
+        randNumber = generateRandomNumber()
+
+    } while (randNumber < 50)
+    return randNumber
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -5,7 +5,13 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let potentialArticles = []
+    for (let title of allArticleTitles) {
+        if (title.length <= 65) {
+            potentialArticles.push(title)
+        }
+    }
+    return potentialArticles;
 }
 
 /*
@@ -14,7 +20,14 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    for (let title of allArticleTitles) {
+        let titleWordsArr = title.split(' ');
+        if (titleWordsArr.length <= 6 ) {
+            return title
+        }
+    }
+
+
 }
 
 /*
@@ -23,15 +36,28 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+    let titleWithNumArr = []
+    for (let title of allArticleTitles) {
+        let reg = /\d/;
+        if (reg.test(title)) {
+            titleWithNumArr.push(title)
+        }
+    }
+    return titleWithNumArr;
 }
 
 /*
     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 numOfCharArr = []
+    for (let title of allArticleTitles) {
+        numOfCharArr.push(Number(title.length))
+    }
+    const totalOfChar =  numOfCharArr.reduce((prevTitleChar, currTitleChar) => {return prevTitleChar + currTitleChar});
+    const avgNumOfChar = (totalOfChar/numOfCharArr.length).toFixed()
+    return Number(avgNumOfChar)
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -34,7 +34,14 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+    let avgPricesArr = [];
+
+    for (let prices of closingPricesForAllStocks) {
+        let totalPrices = prices.reduce((prevPrice, currPrice) => { return (prevPrice + currPrice)})
+        let avgPrices = (totalPrices/5).toFixed(2)
+        avgPricesArr.push(Number(avgPrices))
+    }
+    return avgPricesArr
 }
 
 /*
@@ -48,7 +55,15 @@ 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 priceDiffArr = [];
+
+
+    for (let price of closingPricesForAllStocks) {
+
+        let priceDiff = (price[price.length - 1] - price[0]).toFixed(2)
+        priceDiffArr.push(Number(priceDiff))
+    }
+    return priceDiffArr
 }
 
 /*
@@ -64,7 +79,24 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let highestPriceDescriptionArr = [];
+
+
+
+    function compareFunction(a, b) {
+        return b-a
+    }
+
+
+    for (let currStock = 0; currStock < closingPricesForAllStocks.length; currStock++) {
+        const sortedPrice = closingPricesForAllStocks[currStock].sort(compareFunction)
+        const highestPrice = sortedPrice[0].toFixed(2);
+        const highestPriceInt = Number(highestPrice).toFixed(2)
+        const highestPriceDescription = `The highest price of ${stocks[currStock].toUpperCase()} in the last 5 days was ${highestPriceInt}`
+        highestPriceDescriptionArr.push(highestPriceDescription)
+
+    }
+    return highestPriceDescriptionArr
 }
 
 

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -9,7 +9,14 @@
 */
 
 function factorial(input) {
-    // TODO
+    let numReducedByOneArr = []
+    while (input !== 1) {
+        let newNum = input
+        numReducedByOneArr.push(newNum)
+        input--
+    }
+    const multipleOfAll = numReducedByOneArr.reduce((prev, curr) => {return prev * curr })
+    return multipleOfAll
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -10,8 +10,51 @@
     Each title in the resulting array should be the highest rated book in its genre.
 */
 
+let higherRatedBook = []
+let higherRate = 0;
+let genreArray = []
+
+// function to collect all the unique genres in the object and add it to the genreArray
+function createGenreArray(availableBooks) {
+
+    for (let everyBook of availableBooks) {
+        if (!genreArray.includes(everyBook.genre)) {
+            genreArray.push(everyBook.genre)
+        }
+    }
+    return genreArray
+}
+
 function getHighestRatedInEachGenre(books) {
-    // TODO
+    const allAvailableGenres = createGenreArray(books)
+
+
+
+    // let highestRating;
+    let highestRatedBooksArr = [];
+
+    for (let i = 0; i<allAvailableGenres.length; i++) {
+        let higherRating = 0 //to catch the highest rated book in a genre
+        let highestRatedTitle = "" //to catch the title of the highest rated book in a genre
+        for (let book of books) {
+
+            if (allAvailableGenres[i] === book.genre) {
+
+                if (higherRating < book.rating) {
+                    higherRating = book.rating; // higher rating changes every time it finds the higher rating in a genre
+                    highestRatedTitle = book.title // similarly, title changes for the higher rated book in a genre
+
+
+                }
+
+
+            }
+
+        }
+        highestRatedBooksArr.push(highestRatedTitle)
+
+    }
+    return highestRatedBooksArr
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -14,7 +14,15 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+    let fibonacciNumArr = [0, 1];
+
+    for (let i=2; i<n; i++) {
+      fibonacciNumArr[i] = fibonacciNumArr[i-2] + fibonacciNumArr[i-1]
+
+
+
+    }
+    return fibonacciNumArr
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */