CodeYourFuture · OleksChep · Dec 4, 2022 · Dec 5, 2022 · Dec 7, 2022 · Dec 7, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -9,28 +9,28 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+// Example 1  =  Variable a has not assigned any value.
 let a;
 console.log(a);
 
 
-// Example 2
+// Example 2 = Function sayHello()does not return any information or results.
 function sayHello() {
     let message = "Hello";
-}
+   // return message + "  Hi JScript!";
+} 
+ let hello = sayHello();
+  console.log(hello);
 
-let hello = sayHello();
-console.log(hello);
 
+// Example 3 = When calling a function,function arg-t does not get a value.
 
-// Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
-
 sayHelloToUser();
 
 
-// Example 4
+// Example 4 = There is no element with index 3 in this array arr.
 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
@@ -6,9 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+  let number = 0;
+  let array = [];
+  while (n > 0) {
+    array.push(number);
+    number = number + 2;
+    n = n - 1;
+  }
+  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
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,14 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+
+ let i = 0;
+    while (i < birthdays.length) {
+      if (birthdays[i].includes("July")) {
+        return birthdays[i];
+      }
+     i++;
+    }
 }
-
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+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
@@ -7,9 +7,16 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
-}
+   let i = 0; 
+   let sum = 0;
+    do {
+     sum = sum + i*2;
+     i++;
+    }   
+    while(i < n );
+     return sum;
+    }   
+console.log("The sum of first three even numbers equal ", evenNumbersSum(3)); // should output 6
+console.log("The sum of first zero even numbers equal ", evenNumbersSum(0)); // should output 0
+console.log("The sum of first ten even numbers equal ", evenNumbersSum(10)); // should output 90
 
-console.log(evenNumbersSum(3)); // should output 6
-console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -5,10 +5,10 @@
 */
 
 
-// Change the below code to use a for loop instead of a while loop.
+// 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++;
+for (let i = 0; i < 26; i++) {
+ console.log(String.fromCharCode(97 + i));
 }
-// The output shouldn't change.
+
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -27,8 +27,11 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
-/*
+let i = 0;
+for (let i = 0; i < 5; i++) {
+  console.log(`${WRITERS[i]} is ${AGES[i]} years old` );
+}
+/*"years old"
 The output should look something like this:
 
 Virginia Woolf is 59 years old

diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
@@ -6,11 +6,16 @@
 let tubeStations = [
     "Aldgate",
     "Baker Street",
-    "Picadilly Circus",
-    "Oxford Street",
-    "Tottenham Court Road"
+    "Canada Water",
+    "Forest Hill",
+    " "
 ];
-
+for (const 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) {
+  console.log(element.toUpperCase());
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -1,18 +1,17 @@
+
 /*
     Imagine we're making a weather app!
 
     We have a list of cities that the user wants to track.
     We also already have a temperatureService function which will take a city as a parameter and return a temparature.
-
     Implement the function below:
         - take the array of cities as a parameter
         - return an array of strings, which is a statement about the temperature of each city.
             For example, "The temperature in London is 10 degrees"
         - Hint: you can call the temperatureService function from your function
 */
-
 function getTemperatureReport(cities) {
-    // TODO
+ // TO DO
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -9,8 +9,9 @@ function generateRandomNumber() {
     return Math.round(Math.random() * 100);
 }
 
+
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+    //let number = 0;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -6,6 +6,7 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+     return allArticleTitles.filter((items) => items.length < 65);
 }
 
 /*

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -35,6 +35,8 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+
+
 }
 
 /*

diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
@@ -8,10 +8,36 @@
     Using a loop, complete the function below so it returns the factorial of the number being passed in. 
 */
 
-function factorial(input) {
+ function factorial(n) {
     // TODO
+let result = 1;
+  while (n) {
+    result *= n--;
+  }
+  return result;
+}   
+console.log("Factorial number 2 = ", factorial(2));
+console.log("factorial number 3 = ", factorial(3));
+console.log("factorial number 5 = ", factorial(5));
+console.log("factorial number 10 = ", factorial(10));
+
+
+/* sol 2
+function factorial(n) {
+  if (n === 1) {
+    return 1;
+  }
+
+  return n * factorial(n - 1);
 }
 
+alert(factorial(1) === 1);
+alert(factorial(2) === 2);
+alert(factorial(3) === 6);
+alert(factorial(4) === 24);
+alert(factorial(5) === 120);
+*/
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("3! should be 6", () => {

diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
@@ -14,8 +14,20 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
-}
+  // TODO
+    let a = 1;
+    let b = 1;
+    for (let i = 3; i <= n; i++) {
+      let c = a + b;
+      a = b;
+      b = c;
+    }
+    return b;
+  }
+  console.log(generateFibonacciSequence(3)); // 2
+  console.log(generateFibonacciSequence(5)); // 5
+  console.log(generateFibonacciSequence(10)); //55
+  console.log(generateFibonacciSequence(55)); // 139583862445
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the first 10 numbers in the Fibonacci Sequence", () => {
-Original file line number
+Diff line change
@@ Expand Up / @@ -6,6 +6,7 @@ @@
     */
     function potentialHeadlines(allArticleTitles) {
         // TODO
+         return allArticleTitles.filter((items) => items.length < 65);
     }
     /*
@@ Expand Down @@