WM4-Micheale-Andemariam-javascript-core-1-coursework-week3

.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+    "editor.acceptSuggestionOnEnter": "on",
+    "editor.wordWrap": "on"
+}

1-exercises/A-undefined/exercise.js

@@ -10,12 +10,11 @@
 */
 
 // Example 1
-let a;
+let a;     // a is not assigned to any value
 console.log(a);
 
-
 // Example 2
-function sayHello() {
+function sayHello() { //  function sayHello() is not returning anything  
     let message = "Hello";
 }
 
@@ -28,9 +27,11 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser(); // function sayHelloToUser() is expecting a parameter but was never passed
 
 
 // Example 4
-let arr = [1,2,3];
+let arr = [1,2,3]; // Index 3 is not defined in the array.
 console.log(arr[3]);
+
+

1-exercises/B-while-loop/exercise.js

@@ -4,11 +4,21 @@
     Using a while loop, complete the function below so it logs (using console.log) the first n even numbers as a comma-seperated string.
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
-
+// n % 2 == 0
 function evenNumbers(n) {
     // TODO
+  let x = 1;
+  let y = 0;
+  let array = [];
+  while (x <= n) {
+    array.push(y);
+    x++;
+    y += 2;
+}
+    console.log(array.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

1-exercises/C-while-loop-with-array/exercise.js

@@ -16,8 +16,19 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
+
+
 function findFirstJulyBDay(birthdays) {
     // TODO
+    let count = 0;
+    let result = [];
+    while(count < birthdays.length){
+        if(birthdays[count].includes("July")){
+            result.push(birthdays[count])
+        }
+        count ++;
+    }
+    return result[0];
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"

1-exercises/D-do-while/exercise.js

@@ -8,8 +8,20 @@
 
 function evenNumbersSum(n) {
     // TODO
+    let sum = 0;
+    let x = 1;
+    let y = 0;
+    do {
+        sum = sum + y;
+        x++;
+        y += 2;
+    } while (x <= n) 
+    return sum;
 }
 
+
+
+
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
 console.log(evenNumbersSum(10)); // should output 90

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++;
-}
+// let i = 0;
+// while(i < 26) {
+//     // console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
 // The output shouldn't change.
+
+for (let i = 0; i < 26; i++) {
+        console.log(String.fromCharCode(97 + i));
+
+}

1-exercises/E-for-loop/exercise2.js

@@ -27,6 +27,18 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+let len;
+if (WRITERS.length === AGES.length) {
+    len = WRITERS.length;
+
+} else {
+    return;
+}
+
+for (let i = 0; i < len; i++){
+    console.log(`${WRITERS[i]} is ${AGES[i]} years old`)
+}
+
 
 /*
 The output should look something like this:

1-exercises/F-for-of-loop/exercise.js

@@ -10,7 +10,15 @@ let tubeStations = [
     "Oxford Street",
     "Tottenham Court Road"
 ];
-
+for (const 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 (const chr of str) {
+
+
+    console.log(chr.toUpperCase());
+}
+

2-mandatory/1-weather-report.js

@@ -12,7 +12,18 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    // TODO++
+    let strArr = []
+
+        for (let i = 0; i < cities.length; i++) {
+
+        // console.log(`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees` );
+            let textToDisplay = `The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`;
+            strArr.push(textToDisplay);
+
+
+    }
+    return strArr;
 }
 
 

2-mandatory/2-retrying-random-numbers.js

@@ -11,8 +11,16 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let result;
+    do {
+        result = generateRandomNumber();
+    } while (result <= 50); 
+        return result;
+
+
 }
 
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("Returned value should always be greater than 50", () => {
@@ -22,3 +30,4 @@ test("Returned value should always be greater than 50", () => {
     expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
     expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
 });
+

2-mandatory/3-financial-times.js

@@ -6,6 +6,13 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    let articleTitles = []
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].length <= 65) {
+            articleTitles.push(allArticleTitles[i]);
+        }
+    }
+    return articleTitles;
 }
 
 /*
@@ -14,7 +21,14 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let shortestTitle = allArticleTitles[0];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].match(/\s+/g).length <
+        shortestTitle.match(/\s+/g).length) {
+            shortestTitle = allArticleTitles[i];
+        }        
+    }
+    return shortestTitle;
 }
 
 /*
@@ -23,7 +37,13 @@ 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 titlesWithNum = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (/[0-9]/.test(allArticleTitles[i])) { // this reg exp checks numbers from 0 - 9
+         titlesWithNum.push(allArticleTitles[i]);
+        }
+    }
+    return titlesWithNum;
 }
 
 /*
@@ -32,6 +52,14 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let average = 0;
+    let sum= 0;
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        sum+= allArticleTitles[i].length;
+
+    }
+    average = Math.round(sum / allArticleTitles.length);
+    return average;
 }
 
 

2-mandatory/4-stocks.js

@@ -35,6 +35,21 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let averageArray = [];
+    let averagePrice;
+
+    for (const array of closingPricesForAllStocks) {
+        let num = 0;
+        for (const number of array) {
+            num += number;
+        }
+
+        averagePrice = num / 5;
+        averageArray.push(parseFloat(averagePrice.toFixed(2)));
+    }
+    return averageArray;
+
+
 }
 
 /*
@@ -76,7 +91,7 @@ test("should return the average price for each stock", () => {
 });
 
 test("should return the price change for each stock", () => {
-    expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
+    expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual( 
         [-6.2, -13.4, 23.9, -82.43, -162.77]
     );
 });

3-extra/1-factorial.js

@@ -10,6 +10,15 @@
 
 function factorial(input) {
     // TODO
+    let result = 1;
+
+    let i = input
+    do {
+        result *= i;
+        i--;
+    } while(i > 0);
+
+    return result;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

3-extra/2-array-of-objects.js

@@ -12,6 +12,14 @@
 
 function getHighestRatedInEachGenre(books) {
     // TODO
+    let highestRated = {};
+    for(let book of books) {
+        if(highestRated[book.genre] === undefined || highestRated[book.genre].rating < book.rating) {
+            highestRated[book.genre] = book;
+        }
+    }
+    return Object.values(highestRated)
+            .map(book => book.title);
 }
 
 

3-extra/3-fibonacci.js

@@ -15,6 +15,14 @@
 
 function generateFibonacciSequence(n) {
     // TODO
+    let fibonacciSequence = [];
+    fibonacciSequence[0] = 0;
+    fibonacciSequence[1] = 1;
+    for (i = 2; i < n; i++) {
+        fibonacciSequence[i] = fibonacciSequence[i - 2] + fibonacciSequence[i - 1];
+    }
+
+    return fibonacciSequence;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */