CodeYourFuture · ManSangSin · Feb 26, 2023 · Feb 26, 2023 · Mar 8, 2023 · Mar 17, 2023
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -9,12 +9,12 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+// Example 1: a is not assigned a value on the RHS.
 let a;
 console.log(a);
 
 
-// Example 2
+// Example 2: hello calls the sayHello() function, the sayHello() function assigns a string to a variable called "message" but does not return any data when called upon therefore consolelog() will return undefined as no value is returned from sayHello() function 
 function sayHello() {
     let message = "Hello";
 }
@@ -23,14 +23,14 @@ let hello = sayHello();
 console.log(hello);
 
 
-// Example 3
+// Example 3: sayHelloToUser() function is expecting an input called "user". as no input is specified when the function is called, undefined is assigned instead.
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
 
 
-// Example 4
+// Example 4: items in arrays start from 0 instead of 1, as item 4 does not exist in the array, an undefined is returned instead.
 let arr = [1,2,3];
 console.log(arr[3]);
diff --git a/1-exercises/B-array-literals/exercise.js b/1-exercises/B-array-literals/exercise.js
@@ -4,8 +4,8 @@
   Declare some variables assigned to arrays of values
 */
 
-let numbers = []; // add numbers from 1 to 10 into this array
-let mentors; // Create an array with the names of the mentors: Daniel, Irina and Rares
+let numbers = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; // add numbers from 1 to 10 into this array
+let mentors = [ "Daniel", "Irina", "Rares"]; // Create an array with the names of the mentors: Daniel, Irina and Rares
 
 /* 
   DO NOT EDIT BELOW THIS LINE

diff --git a/1-exercises/C-array-get-set/exercise.js b/1-exercises/C-array-get-set/exercise.js
@@ -5,11 +5,12 @@
 */
 
 function first(arr) {
-  return; // complete this statement
+  return arr[0]; // complete this statement
 }
 
 function last(arr) {
-  return; // complete this statement
+  arrLength = arr.length;
+  return arr[arrLength - 1]; // complete this statement
 }
 
 /* 

diff --git a/1-exercises/C-array-get-set/exercises2.js b/1-exercises/C-array-get-set/exercises2.js
@@ -7,6 +7,8 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
+numbers.push(4);
+numbers[0] = 1;
 
 /* 
   DO NOT EDIT BELOW THIS LINE

diff --git a/1-exercises/D-for-loop/exercise.js b/1-exercises/D-for-loop/exercise.js
@@ -27,7 +27,10 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+let numberOfWriters = WRITERS.length;
+for (let i = 0; i < numberOfWriters; i++) {
+    console.log(`${WRITERS[i]} is ${AGES[i]} years old`);
+}
 /*
 The output should look something like this:
 

diff --git a/1-exercises/E-while-loop-with-array/exercise.js b/1-exercises/E-while-loop-with-array/exercise.js
@@ -5,19 +5,26 @@
 */
 
 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 numberOfBirthdays = BIRTHDAYS.length;
+  for (let i = 0; i < numberOfBirthdays; i++) {
+    if (BIRTHDAYS[i].includes("July")) {
+      return BIRTHDAYS[i];
+      break;
+    }
+  }
+  // TODO
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -12,52 +12,58 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+  // TODO
+  let numberOfCities = cities.length;
+  const cityTempDataArr = [];
+  for (let i = 0; i < numberOfCities; i++) {
+    let cityTemp = temperatureService(cities[i]);
+    cityTempDataArr.push(
+      `The temperature in ${cities[i]} is ${cityTemp} degrees`
+    );
+  }
+  return cityTempDataArr;
 }
 
-
 /* ======= 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 array of same length as arguement", () => {
+  let usersCities = ["London", "Paris", "São Paulo"];
+  expect(getTemperatureReport(usersCities).length).toEqual(3);
+});
+
 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([]);
+});
diff --git a/2-mandatory/2-financial-times.js b/2-mandatory/2-financial-times.js
@@ -5,7 +5,15 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+  // TODO: iterate over all the articles in the input array and check if the article string is less than or equal to 65, if true: add to validTitleArr array.
+  let numberOfTitles = allArticleTitles.length;
+  let validTitleArr = [];
+  for (i = 0; i < numberOfTitles; i++) {
+    if (allArticleTitles[i].length <= 65) {
+      validTitleArr.push(allArticleTitles[i]);
+    }
+  }
+  return validTitleArr;
 }
 
 /*
@@ -14,7 +22,18 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+  // TODO: for each article string, split the string and count the number of words which should equal the number of array items. If the current number of array items is less than the value stored in the  shortestTitle variable, set current article title as the new value.
+  let shortestTitle = "";
+  for (const article of allArticleTitles) {
+    let wordsInTitleArr = article.split(" ");
+    let shortestTitleArr = shortestTitle.split(" ");
+    let wordCount = wordsInTitleArr.length;
+    let shortestTitleCount = shortestTitleArr.length;
+    if (wordCount < shortestTitleCount || shortestTitle === "") {
+      shortestTitle = article;
+    }
+  }
+  return shortestTitle;
 }
 
 /*
@@ -23,59 +42,80 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+  // TODO: iterate through each title, and iterate each character to check if character is a number. if true add to new array.
+  const articlesWithNumbers = [];
+  let numberOfArticles = allArticleTitles.length;
+  console.log(numberOfArticles);
+  for (let i = 0; i < numberOfArticles; i++) {
+    if (/[0-9]/.test(allArticleTitles[i])) {
+      articlesWithNumbers.push(allArticleTitles[i]);
+    }
+  }
+  return articlesWithNumbers;
 }
 
 /*
     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
+  // TODO: iterate through each title, and iterate each character. for each character add +1 to characterCount. divide characterCount by the number of articles. Use Math.round method
+  let characterCount = 0;
+  let numberOfArticles = allArticleTitles.length;
+  for (const article of allArticleTitles) {
+    for (const character of article) {
+      characterCount++;
+    }
+  }
+  return Math.round(characterCount / numberOfArticles);
 }
 
-
-
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [
-    "Streaming wars drive media groups to spend more than $100bn on new content",
-    "Amazon Prime Video India country head: streaming is driving a TV revolution",
-    "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights",
-    "British companies look to muscle in on US retail investing boom",
-    "Libor to take firm step towards oblivion on New Year's Day",
-    "Audit profession unattractive to new recruits, says PwC boss",
-    "Chinese social media users blast Elon Musk over near miss in space",
-    "Companies raise over $12tn in 'blockbuster' year for global capital markets",
-    "The three questions that dominate investment",
-    "Brussels urges Chile's incoming president to endorse EU trade deal",
+  "Streaming wars drive media groups to spend more than $100bn on new content",
+  "Amazon Prime Video India country head: streaming is driving a TV revolution",
+  "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights",
+  "British companies look to muscle in on US retail investing boom",
+  "Libor to take firm step towards oblivion on New Year's Day",
+  "Audit profession unattractive to new recruits, says PwC boss",
+  "Chinese social media users blast Elon Musk over near miss in space",
+  "Companies raise over $12tn in 'blockbuster' year for global capital markets",
+  "The three questions that dominate investment",
+  "Brussels urges Chile's incoming president to endorse EU trade deal",
 ];
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("should only return potential headlines", () => {
-    expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(new Set([
-        "British companies look to muscle in on US retail investing boom",
-        "Libor to take firm step towards oblivion on New Year's Day",
-        "Audit profession unattractive to new recruits, says PwC boss",
-        "The three questions that dominate investment"
-    ]));
+  expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(
+    new Set([
+      "British companies look to muscle in on US retail investing boom",
+      "Libor to take firm step towards oblivion on New Year's Day",
+      "Audit profession unattractive to new recruits, says PwC boss",
+      "The three questions that dominate investment",
+    ])
+  );
 });
 
 test("should return an empty array for empty input", () => {
-    expect(potentialHeadlines([])).toEqual([]);
+  expect(potentialHeadlines([])).toEqual([]);
 });
 
 test("should return the title with the fewest words", () => {
-    expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual("The three questions that dominate investment");
+  expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual(
+    "The three questions that dominate investment"
+  );
 });
 
 test("should only return headlines containing numbers", () => {
-    expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual(new Set([
-        "Streaming wars drive media groups to spend more than $100bn on new content",
-        "Companies raise over $12tn in 'blockbuster' year for global capital markets"
-    ]));
+  expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual(
+    new Set([
+      "Streaming wars drive media groups to spend more than $100bn on new content",
+      "Companies raise over $12tn in 'blockbuster' year for global capital markets",
+    ])
+  );
 });
 
 test("should return the average number of characters in a headline", () => {
-    expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
+  expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65);
 });