CodeYourFuture · MatildaAko · Jan 12, 2022 · Jan 12, 2022 · Jan 12, 2022 · Jan 12, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -11,16 +11,17 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); // a has been declared but not initialized, as it does not have a value, it returns undefined.
 
 
 // Example 2
 function sayHello() {
     let message = "Hello";
-}
+} 
 
 let hello = sayHello();
 console.log(hello);
+// the function does not return anything
 
 
 // Example 3
@@ -29,8 +30,10 @@ function sayHelloToUser(user) {
 }
 
 sayHelloToUser();
+//when the function is called, there is no value given for the user argument, this results in the user variable being undefined
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+//arrays are zero indexed so the highest given index in this is 2 so there is no value in arr[3]
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let i = 0;
+    let result = [];
+    while (result.length < n) {
+        if (i % 2 === 0) {
+            result.push(i);
+        }
+        i++;
+    }
+    return result.toString();
 }
 
 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
@@ -17,7 +17,15 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    let julyDates = [];
+    let i = 0;
+    while (i < birthdays.length) {
+        if (birthdays[i].includes("July")) {
+            julyDates.push(birthdays[i]);
+        }
+        i++;
+    }
+    return julyDates[0];
 }
 
 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 numbers = [];
+    let sum = 0;
+    let i = 0;
+    do {
+        if (i % 2 === 0) {
+            sum += i;
+            numbers.push(i);
+        }
+        i++;
+    } while (numbers.length < n);
+    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 +6,7 @@
 
 
 // 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
@@ -26,7 +26,9 @@ const AGES = [
     49
 ];
 
-// 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 +10,12 @@ 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) {
+    console.log(letter.toUpperCase())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -12,7 +12,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let weather = [];
+    for (var i = 0; i < cities.length; i++) {
+        weather.push(`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`);
+    }
+    return weather;
 }
 
 

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 i = 0;
+    let x = 0;
+    do {
+        x = generateRandomNumber(i);
+        i++;
+    } while (x <= 50);
+    return x;
 }
 
 /* ======= 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 allowedTitles = [];
+    for (let title of allArticleTitles) {
+        if (title.length <= 65) {
+            allowedTitles.push(title);
+        }
+    }
+    return allowedTitles;
 }
 
 /*
@@ -14,7 +20,17 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let allTitles = potentialHeadlines(allArticleTitles);
+    let wordsLength = Infinity;
+    let titleWords = "";
+    for (let title of allTitles) {
+        let words = title.split(" ");
+        if (words.length < wordsLength) {
+            wordsLength = words.length;
+            titleWords = title;
+        }
+    }
+    return titleWords;
 }
 
 /*
@@ -23,15 +39,28 @@ 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 hasNumber = [];
+    for (title of allArticleTitles) {
+        if (title.match(/[0-9]/g)) {
+            hasNumber.push(title);
+        }
+    }
+    return hasNumber;
 }
 
 /*
     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 titles = [];
+    for (title of allArticleTitles) {
+        titles.push(title.length);
+    }
+    let total = titles.reduce((a, b) => {
+        return a + b;
+    })
+    return parseInt(total / titles.length)
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -34,7 +34,15 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+    let closingPrices = closingPricesForAllStocks;
+    let averagePrices = [];
+    for (let prices of closingPrices) {
+        let total = prices.reduce((a, b) => {
+            return a + b;
+        });
+        averagePrices.push(parseFloat((total / prices.length).toFixed(2)));
+    }
+    return averagePrices;
 }
 
 /*
@@ -47,8 +55,17 @@ function getAveragePrices(closingPricesForAllStocks) {
                 (Apple's price on the 5th day) - (Apple's price on the 1st day) = 172.99 - 179.19 = -6.2
     The price change value should be rounded to 2 decimal places, and should be a number (not a string)
 */
+function rounded(num) {
+    return parseFloat(num.toFixed(2));
+}
 function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+    let closingPrices = closingPricesForAllStocks;
+    let priceChange = [];
+    for (let prices of closingPrices) {
+        let change = prices[prices.length - 1] - prices[0];
+        priceChange.push(rounded(change));
+    }
+    return priceChange;
 }
 
 /*
@@ -64,31 +81,37 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
-}
+    let closingPrices = closingPricesForAllStocks;
+    let stock = stocks;
+    let highestArr = [];
 
+    for (let i = 0; i < closingPrices.length; i++) {
+        let highest = -Infinity;
+        for (let j = 0; j < closingPrices[i].length; j++) {
+            if (closingPrices[i][j] > highest) {
+                highest = closingPrices[i][j];
+            }
+        }
+        highestArr.push(`The highest price of ${stock[i].toUpperCase()} in the last 5 days was ${highest.toFixed(2)}`);
+    }
+    return highestArr;
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {
-    expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
-        [176.89, 335.66, 3405.66, 2929.22, 1041.93]
-    );
+    expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([176.89, 335.66, 3405.66, 2929.22, 1041.93]);
 });
 
 test("should return the price change for each stock", () => {
-    expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
-        [-6.2, -13.4, 23.9, -82.43, -162.77]
-    );
+    expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([-6.2, -13.4, 23.9, -82.43, -162.77]);
 });
 
 test("should return a description of the highest price for each stock", () => {
-    expect(highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS)).toEqual(
-        [
-            "The highest price of AAPL in the last 5 days was 180.33",
-            "The highest price of MSFT in the last 5 days was 342.45",
-            "The highest price of AMZN in the last 5 days was 3421.37",
-            "The highest price of GOOGL in the last 5 days was 2958.13",
-            "The highest price of TSLA in the last 5 days was 1101.30"
-        ]
-    );
+    expect(highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS)).toEqual([
+        "The highest price of AAPL in the last 5 days was 180.33",
+        "The highest price of MSFT in the last 5 days was 342.45",
+        "The highest price of AMZN in the last 5 days was 3421.37",
+        "The highest price of GOOGL in the last 5 days was 2958.13",
+        "The highest price of TSLA in the last 5 days was 1101.30",
+    ]);
 });
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -9,7 +9,16 @@
 */
 
 function factorial(input) {
-    // TODO
+    let num = [];
+    let i = 1;
+    while (i <= input) {
+        num.push(i);
+        i++;
+    }
+    let result = num.reduce((a, b) => {
+        return a * b;
+    })
+    return result;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
@@ -11,7 +11,20 @@
 */
 
 function getHighestRatedInEachGenre(books) {
-    // TODO
+    let sorted = books.sort((a, b) => {
+        return a.rating === b.rating ? 0 : a.rating < b.rating ? 1 : -1;
+    });
+    let i = 0;
+    let genres = [];
+    let topTitles = [];
+    while (genres.length < 3) {
+        if (!genres.includes(sorted[i].genre)) {
+            genres.push(sorted[i].genre);
+            topTitles.push(sorted[i].title);
+        }
+        i++;
+    }
+    return topTitles;
 }
 
 

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -14,7 +14,13 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+    let sequence = [0, 1];
+    let i = 1;
+    while (sequence.length < n) {
+        sequence.push(sequence[i] + sequence[i - 1]);
+        i++;
+    }
+    return sequence;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */