CodeYourFuture · Grajales-K · Dec 31, 2022 · Jan 3, 2023 · Jan 3, 2023
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -9,28 +9,35 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+
+//the variable did not contain any value. for this reason will be undefined
+//Example 1
 let a;
-console.log(a);
+console.log(a);  
 
 
+//this fuction did not have return, so when it's called will be undefined
 // Example 2
-function sayHello() {
-    let message = "Hello";
+function sayHello(a) {
+    let message = "Hello2";
 }
 
 let hello = sayHello();
 console.log(hello);
 
 
+// this will return hello and then undefined because we did not declare of the variable user.
 // Example 3
 function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+    console.log(`Hello ${user}`);  
 }
 
 sayHelloToUser();
 
 
+
+//this array contain 3 items but the index start from 0 and will display until index[2]=3
 // Example 4
 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 +6,16 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let result = []
+    let i = 0;
+    while(i < n){
+    result.push(i * 2)
+    i++
+}
+return result.join() //with join() we can display the length of the chain in te same line
 }
 
-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
+console.log(evenNumbers(3)); // should output 0,2,4
+console.log(evenNumbers(0)); // should output nothing
+console.log(evenNumbers(10)); // should output 0,2,4,6,8,10,12,14,16,18
+// console.log(evenNumbers(3))
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -16,8 +16,19 @@ const BIRTHDAYS = [
     "November 15th"
 ];
 
-function findFirstJulyBDay(birthdays) {
-    // TODO
+function findFirstJulyBDay(birthday) {
+    let i = 0
+    while(i < birthday.length){
+        if(birthday[i].startsWith('July')){
+            return birthday[i];
+        }
+        i++
+    }    
 }
 
+//this function will find the first word that start with July and will return it.
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+
+// String.prototype.startsWith()
+// The startsWith() method determines whether a string begins with the characters of a specified string, returning true or false as appropriate.
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
@@ -7,9 +7,20 @@
 */
 
 function evenNumbersSum(n) {
-    // 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
+
+
+
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,19 @@
 
 
 // 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))
+    // return String.fromCharCode(97 + i)
+}
+
+/*String.fromCharCode()
+The String.fromCharCode() static method returns a string created from the specified sequence of UTF-16 code units.
+https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode*/
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -28,7 +28,20 @@ const AGES = [
 
 // TODO - Write for loop code here
 
-/*
+for(let i = 0; i < WRITERS.length && AGES.length; i++){
+    console.log(WRITERS[i] + " is " + AGES[i] + " years old")
+}
+
+// ==================other option with interpolation===============
+
+// for(let i = 0; i < WRITERS.length; i++) {
+//     // Because we want to retrieve the element at the same index for both arrays, we can re-use the same variable i
+//     // We are also making use of string interpolation here - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
+//     console.log(`${WRITERS[i]} is ${AGES[i]} 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
@@ -1,5 +1,6 @@
 /*
-    A for-of loop is a easy and way of looping through the elements of an array, string or any other "iterable object" (think sequence of elements).    
+    A for-of loop is a easy and way of looping through the elements of an array, 
+    string or any other "iterable object" (think sequence of elements).    
 */
 
 // TODO Use a for-of loop to output each of the tube stations below.
@@ -11,6 +12,26 @@ let tubeStations = [
     "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());
+}
+
+let array = "a1, b2, c4, d5, g7, k8";
+
+for(let letter of array) {
+    console.log(letter.toUpperCase());
+}
+
+let chain ="i am a string";
+
+for(let letter of chain) {
+    console.log(letter.toUpperCase());
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -11,11 +11,19 @@
         - Hint: you can call the temperatureService function from your function
 */
 
+// function getTemperatureReport(cities) { 
+//     // TODO
+// }
 function getTemperatureReport(cities) {
-    // TODO
+    let cityWeather = [];
+  for (let i = 0; i < cities.length; i++) {
+    cityWeather.push(
+      `The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`
+    );
+  }
+  return cityWeather;
 }
 
-
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -1,16 +1,25 @@
 /*
-    In the below example, we want to keep calling generateRandomNumber until we get a value that is > 50.
+    In the below example, we want to keep calling generateRandomNumber
+    until we get a value that is > 50.
     Implement this using a do-while loop.
 */
 
 // This function shouldn't be changed
 function generateRandomNumber() {
     console.log("Generating number...");
-    return Math.round(Math.random() * 100);
+    return Math.round(Math.random() * 100); 
 }
 
+
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+    // TODO - implement using a do-while loo
+    let randomNumber;
+    do { 
+        randomNumber = generateRandomNumber();
+
+    } while (randomNumber < 50); //we will run this code, only if we received a value less than 50.
+    return randomNumber;
+
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -5,18 +5,32 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let shorTitles = [];
+    for (const title of allArticleTitles) {
+        if (title.length <= 65){
+            shorTitles.push(title);
+      }  
+   }
+   return shorTitles;
 }
 
+
 /*
     The editor of the FT likes short headlines with only a few words!
     Implement the function below, which returns the title with the fewest words.
     (you can assume words will always be seperated by a space)
 */
+
+
+// If you want to use the Math.min approach, first extract he lengths of each word and then pass those to the Math.max.
+
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+
 }
 
+
+
+
 /*
     The editor of the FT has realised that headlines which have numbers in them get more clicks!
     Implement the function below to return a new array containing all the headlines which contain a number.
@@ -34,7 +48,79 @@ function averageNumberOfCharacters(allArticleTitles) {
     // TODO
 }
 
+/*
+    Imagine you are working on the Financial Times web site! They have a 
+    list of article titles stored in an array.
 
+    The home page of the web site has a headline section, which only has 
+    space for article titles which are 65 characters or less.
+    Implement the function below, which will return a new array containing only article titles which will fit.
+*/
+// function potentialHeadlines(allArticleTitles) {
+//     let arr =[];
+//        for (let article of allArticleTitles){
+//            if (article.length <= 65){
+//                arr.push(article)
+//            }
+//        }
+//        return arr;
+//    }
+
+//    /*
+//        The editor of the FT likes short headlines with only a few words!
+//        Implement the function below, which returns the title with the fewest words.
+//        (you can assume words will always be seperated by a space)
+//    */
+//    function titleWithFewestWords(allArticleTitles) {
+//        let arr = [];
+//        for (let i = 0; i < allArticleTitles.length; i++) {
+//            arr.push(numberOfWords(allArticleTitles[i]));
+//        }
+//        return allArticleTitles[arr.indexOf(Math.min(...arr))];
+//    }
+
+//    function numberOfWords(title) {
+//        console.log(`title: ${title}`);
+//        let words = title.split(' ');
+//        console.log(`words: ${words}`);
+//        return words.length;
+//    }
+//    // new link in chat!!!
+//    /*let 
+//       on The editor of the FT has realised that headlines which have numbers in them get more clicks!n
+//        Implement the function below to return a new array containing all the headlines which ctain a number.
+//        (Hint: remember that you can also loop through the characters of a string if you need to)
+//    */
+//    function headlinesWithNumbers(allArticleTitles) {
+//        // TODO
+//        let arr= [];
+//        for (let article of allArticleTitles){
+//            for (let char of article){
+//                if (char>="0" && char<="9"){
+//                    arr.push (article);
+//                    break;
+//                }
+
+//            }
+//        }
+//        return arr
+//    }
+
+//    /*
+//        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
+//        let sum = 0; 
+//        for (let article of allArticleTitles){
+//            sum += article.length;
+
+//            }
+
+//        return Math.round(sum / allArticleTitles.length)
+//    }
+//    
 
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [