Excercises

foundations/data_types_and_conditionals/01_helloWorld/helloWorld.js

@@ -1,5 +1,5 @@
 const helloWorld = function() {
-  return ''
+  return 'Hello, World!'
 };
 
 module.exports = helloWorld;

foundations/data_types_and_conditionals/03_numberChecker/numberChecker.js

@@ -1,5 +1,5 @@
 function numberChecker(number) {
-  if (number === 6) {
+  if (number >= 10) {
     return true;
   } else {
     return false;

foundations/object_basics/01_calculator/calculator.js

@@ -1,25 +1,31 @@
-const add = function() {
+const add = function(a, b) {
+  return a+b;
 
 };
 
-const subtract = function() {
-
+const subtract = function(a,b) {
+  return a-b;	
 };
 
-const sum = function() {
+const sum = function(arr) {
+  return arr.reduce((elem, total) => elem+total,0);
 
 };
 
-const multiply = function() {
-
+const multiply = function(arr) {
+  return arr.reduce((elem, total) => elem*total,1);
 };
 
-const power = function() {
-
+const power = function(base, exponent) {
+	return base ** exponent;
 };
 
-const factorial = function() {
-
+const factorial = function(num) {
+	if(num === 0 || num === 1){
+    return 1;
+  }
+
+  return num * factorial(num-1);
 };
 
 // Do not edit below this line

foundations/object_basics/02_palindromes/palindromes.js

@@ -1,4 +1,24 @@
-const palindromes = function () {
+const palindromes = function (str) {
+    let l = 0;
+    let r = str.length-1;
+
+    const newStr = str.toLowerCase();
+
+    while (l < r){
+        while("!¡?¿.,-´ '".includes(newStr[l])){
+            l+=1;
+        }
+
+        while("!¡?¿.,-´ '".includes(newStr[r])){
+            r-=1;
+        }
+        if(newStr[l] !== newStr[r]){
+            return false;
+        }
+        l+=1;
+        r-=1;
+    }
+    return true;
 
 };
 

foundations/object_basics/03_fibonacci/fibonacci.js

@@ -1,6 +1,12 @@
-const fibonacci = function() {
+const fibonacci = function(num) {
+    if(num === 1 || num === 2){
+        return 1;
+    }
+
+    return fibonacci(num-1) + fibonacci(num-2);
 
 };
 
+
 // Do not edit below this line
 module.exports = fibonacci;

foundations/object_basics/04_getTheTitles/getTheTitles.js

@@ -1,4 +1,5 @@
-const getTheTitles = function() {
+const getTheTitles = function(books) {
+    return books.map(book => book.title);
 
 };
 

foundations/object_basics/05_findTheOldest/findTheOldest.js

@@ -1,6 +1,20 @@
-const findTheOldest = function() {
+const findTheOldest = function(arr) {
+    let oldest = 0;
+    let oldestName;
+
+    for(person of arr){
+        let deathYear = person.yearOfDeath ? person.yearOfDeath: 2025;
+        let age = deathYear - person.yearOfBirth;
+
+        if(age > oldest){
+            oldest = age;
+            oldestName = person;
+        } 
+    }
+    return oldestName;
 
 };
 
+
 // Do not edit below this line
 module.exports = findTheOldest;