ZA2-Patou Mabando-JavaScript-core-1-Coursework-Week3

1-exercises/A-undefined/exercise.js

@@ -11,7 +11,7 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a);// Answer: The variable a is not defined. 
 
 
 // Example 2
@@ -20,17 +20,17 @@ function sayHello() {
 }
 
 let hello = sayHello();
-console.log(hello);
+console.log(hello);//  //Answer: Nothing is returned in this function
 
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser();// Hello is not defined.
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]);// Ansewer: Console.log(arr[3]) is undefined because arr element doest not have index 3.

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

@@ -6,7 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+  let i = 0;
+  let numbersList = [];
+  while (numbersList.length < n) {
+    if (i % 2 === 0) {
+      numbersList.push(i);
+    }
+    i++;
+  }
+  console.log(numbersList.toString());
 }
 
 evenNumbers(3); // should output 0,2,4

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

@@ -5,19 +5,27 @@
 */
 
 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
+  // TODO
+  arrayLength = birthdays.length;
+  i = 0;
+  while (i < arrayLength) {
+    if (birthdays[i].includes("July")) {
+      return birthdays[i];
+    }
+    i++;
+  }
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"

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

@@ -7,9 +7,16 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+  // TODO
+  let sum = 0;
+  let i = 0;
+  do {
+    sum += i * 2;
+    i++;
+  } while (i < n);
+  return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
+console.log(evenNumbersSum(10)); // should output 90

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

@@ -6,8 +6,7 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+for (i = 0; i < 26; i++) {
     console.log(String.fromCharCode(97 + i));
     i++;
 }

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

@@ -27,7 +27,9 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+for (let i = 0; i < WRITERS.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

@@ -14,3 +14,6 @@ let tubeStations = [
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let i = 0; i < str.length; i ++) {
+    console.log(str[i].toUpperCase())
+}

2-mandatory/1-weather-report.js

@@ -12,52 +12,50 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+  // TODO
+  let temperatureReport = [];
+  for (city of cities) {
+    let cityTemp = temperatureService(city);
+    temperatureReport.push(`The temperature in ${city} is ${cityTemp} degrees`);
+  }
+  return temperatureReport;
 }
 
-
 /* ======= 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/3-financial-times.js

@@ -5,7 +5,16 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+  // TODO
+  let headlines = [];
+
+  for (let eachTitle of allArticleTitles) {
+    if (eachTitle.length <= 65) {
+      headlines.push(eachTitle);
+    }
+  }
+
+  return headlines;
 }
 
 /*
@@ -14,7 +23,20 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+  // TODO
+  let leastWordsTillNow;
+  let headlineWithLeastWords;
+
+  for (let eachHeadline of allArticleTitles) {
+    let numberOfWords = eachHeadline.split(" ").length;
+
+    if (leastWordsTillNow === undefined || leastWordsTillNow > numberOfWords) {
+      leastWordsTillNow = numberOfWords;
+      headlineWithLeastWords = eachHeadline;
+    }
+  }
+
+  return headlineWithLeastWords;
 }
 
 /*
@@ -23,59 +45,79 @@ 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
+  let headlineTitlesWithNumbers = [];
+
+  for (let eachHeadline of allArticleTitles) {
+    if (headlineTitleHasNumbers(eachHeadline)) {
+      headlineTitlesWithNumbers.push(eachHeadline);
+    }
+  }
+
+  return headlineTitlesWithNumbers;
 }
 
 /*
     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
+  let characterTotal = 0;
 
+  for (let eachTitle of allArticleTitles) {
+    characterTotal += eachTitle.length;
+  }
 
+  return Math.round(characterTotal / allArticleTitles.length);
+}
 
 /* ======= 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);
 });