London 9 - Nataliia Zablotska - JS-Core-1 - Week 3

1-exercises/A-undefined/exercise.js

@@ -10,27 +10,26 @@
 */
 
 // Example 1
-let a;
+let a = 5;
 console.log(a);
 
-
 // Example 2
 function sayHello() {
-    let message = "Hello";
+  let message = "Hello";
+    console.log(message);
+  return message;
 }
 
 let hello = sayHello();
 console.log(hello);
 
-
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
-
+sayHelloToUser("Natalie");
 
 // Example 4
-let arr = [1,2,3];
-console.log(arr[3]);
+let arr = [1, 2, 3];
+console.log(arr[2]);

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

@@ -6,7 +6,12 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+  // TODO
+  let i = 0;
+  while (i < n * 2) {
+    console.log(i);
+    i += 2;
+  }
 }
 
 evenNumbers(3); // should output 0,2,4

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

@@ -5,19 +5,24 @@
 */
 
 const BIRTHDAYS = [
-    "January 7th",
-    "February 12th",
-    "April 3rd",
-    "April 5th",
-    "May 3rd",
-    "July 11th",
-    "July 17th",
-    "September 28th",
-    "November 15th"
+  "January 7th",
+  "February 12th",
+  "April 3rd",
+  "April 5th",
+  "May 3rd",
+  "July 11th",
+  "July 17th",
+  "September 28th",
+  "November 15th",
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+  let i = 0;
+
+  while (!birthdays[i].includes("July")) {
+    i++;
+  }
+  return birthdays[i];
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"

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

@@ -7,9 +7,21 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+  let numbersSum = 0;
+  let sum = "0"; // for checking
+  let i = 0;
+  do {
+    sum += " + " + i * 2; // for checking
+    numbersSum = numbersSum + i * 2; // numbersSum += i;
+    i = i + 1;
+  } while (i < n);
+  console.log(sum); // for checking
+  return numbersSum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
+// 0 + 2 + 4 = 6
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
+// 0
+console.log(evenNumbersSum(10)); // should output 90
+// 0 + 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18

1-exercises/E-for-loop/exercise1.js

@@ -4,11 +4,14 @@
     Change the while loop below into a for 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++;
+// 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.

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

@@ -11,22 +11,18 @@
 */
 
 const WRITERS = [
-    "Virginia Woolf",
-    "Zadie Smith",
-    "Jane Austen",
-    "Bell Hooks",
-    "Yukiko Motoya"
-]
-
-const AGES = [
-    59,
-    40,
-    41,
-    63,
-    49
+  "Virginia Woolf",
+  "Zadie Smith",
+  "Jane Austen",
+  "Bell Hooks",
+  "Yukiko Motoya",
 ];
 
-// TODO - Write for loop code here
+const AGES = [59, 40, 41, 63, 49];
+
+for (let i = 0; i < AGES.length; 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

@@ -4,13 +4,20 @@
 
 // TODO Use a for-of loop to output each of the tube stations below.
 let tubeStations = [
-    "Aldgate",
-    "Baker Street",
-    "Picadilly Circus",
-    "Oxford Street",
-    "Tottenham Court Road"
+  "Aldgate",
+  "Baker Street",
+  "Picadilly Circus",
+  "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());
+}

2-mandatory/1-weather-report.js

@@ -12,52 +12,54 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+  let myArray = [];
+  myArray.push(...cities);
+  let newArray = [];
+  for (let i = 0; i < myArray.length; i++) {
+    newArray.push(
+      `The temperature in ${myArray[i]} is ${temperatureService(
+        myArray[i]
+      )} degrees`
+    );
+  }
+  return newArray;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {
-    let temparatureMap  = new Map();
-
-    temparatureMap.set('London', 10);
-    temparatureMap.set('Paris', 12);
-    temparatureMap.set('Barcelona', 17);
-    temparatureMap.set('Dubai', 27);
-    temparatureMap.set('Mumbai', 29);
-    temparatureMap.set('São Paulo', 23);
-    temparatureMap.set('Lagos', 33);
-    
-    return temparatureMap.get(city);
+  let temparatureMap = new Map();
+
+  temparatureMap.set("London", 10);
+  temparatureMap.set("Paris", 12);
+  temparatureMap.set("Barcelona", 17);
+  temparatureMap.set("Dubai", 27);
+  temparatureMap.set("Mumbai", 29);
+  temparatureMap.set("São Paulo", 23);
+  temparatureMap.set("Lagos", 33);
+
+  return temparatureMap.get(city);
 }
 
 test("should return a temperature report for the user's cities", () => {
-    let usersCities = [
-        "London",
-        "Paris",
-        "São Paulo"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in London is 10 degrees",
-        "The temperature in Paris is 12 degrees",
-        "The temperature in São Paulo is 23 degrees"
-    ]);
+  let usersCities = ["London", "Paris", "São Paulo"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in London is 10 degrees",
+    "The temperature in Paris is 12 degrees",
+    "The temperature in São Paulo is 23 degrees",
+  ]);
 });
 
 test("should return a temperature report for the user's cities (alternate input)", () => {
-    let usersCities = [
-        "Barcelona",
-        "Dubai"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in Barcelona is 17 degrees",
-        "The temperature in Dubai is 27 degrees"
-    ]);
+  let usersCities = ["Barcelona", "Dubai"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in Barcelona is 17 degrees",
+    "The temperature in Dubai is 27 degrees",
+  ]);
 });
 
 test("should return an empty array if the user hasn't selected any cities", () => {
-    expect(getTemperatureReport([])).toEqual([]);
-});
+  expect(getTemperatureReport([])).toEqual([]);
+});

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

@@ -5,20 +5,24 @@
 
 // This function shouldn't be changed
 function generateRandomNumber() {
-    console.log("Generating number...");
-    return Math.round(Math.random() * 100);
+  console.log("Generating number...");
+  return Math.round(Math.random() * 100);
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+  let n;
+  do {
+    n = generateRandomNumber();
+  } while (n < 50);
+  return n;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("Returned value should always be greater than 50", () => {
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
 });