diff --git a/extraObjIH.js b/extraObjIH.js
new file mode 100644
index 0000000..65467ad
--- /dev/null
+++ b/extraObjIH.js
@@ -0,0 +1,60 @@
+const ironhacker = {
+    firstName: 'Marko',
+    age: 39,
+    favoriteLanguage: 'JavaScript',
+    isSatisfied: true,
+    'works at': null,
+    isRemote: false,
+    address: {
+      country: 'Portugal',
+      city: 'Lisbon',
+    },
+  };
+  
+  // 1: Update age to 40 and console.log the new value
+  // ... your code here
+
+  ironhacker.age = 40;
+  console.log(ironhacker.age);
+  
+  // 2: Update ironhacker's place of work to 'Google' and console.log the new value
+  // ... your code here
+  ironhacker.placeofwork = "Google"; 
+
+ console.log(ironhacker.placeofwork)
+  
+  // 3: Remove the 'isRemote' property and console.log the new value of 'isRemote' to make sure it is undefined
+  // ... your code here
+  delete ironhacker.isRemote; 
+  console.log(ironhacker.isRemote)
+
+  // 4: Add a new property: 'didGraduate' and set it to a valid boolean value and console.log the new value
+  // ... your code here
+  ironhacker.didGraduate = true; 
+  console.log(ironhacker.didGraduate)
+
+  // 5: console.log all keys (property names) of the ironhacker object (you can print them as an array or as individual console.logs)
+  // ... your code here
+  console.log(ironhacker)
+  
+  // 6: check if ironhacker has property 'favoriteLanguage'. Console.log a boolean true or false depending if 'favoriteLanguage' exists as a preperty
+  // ... your code here
+  const hasfavoriteLanguage = ironhacker.hasOwnProperty("favoriteLanguage");
+  console.log(hasfavoriteLanguage);
+
+
+  // 7: BONUS: update the property city to be 'Porto' and console.log the new value
+  // - Note that it is nested inside another object.
+
+  
+  
+  // 8: BONUS: Complete the following function:
+  // it should print the country and city of the person with the following string structure:
+  // Our ironhacker FIRST_NAME is from CITY, COUNTRY
+  
+  function countryAndCity(person) {
+    // make sure to use the parameter person for their properties and to return the string
+  }
+  
+  console.log('Bonus 8.', countryAndCity(ironhacker));
+  
\ No newline at end of file
diff --git a/src/books.js b/src/books.js
index c8119bb..c2f0863 100644
--- a/src/books.js
+++ b/src/books.js
@@ -38,28 +38,71 @@
 
 
 // Your code here:
-const booksArray = [];
+const booksArray  = [
+  {
+    title: "The Old Man and the Sea",
+    pages: 128,
+    author: "Ernest Hemingway",
+    details: {
+      language: "English",
+      description: "One of Hemingway's most famous works, it tells the story of Santiago..."
+    }
+  },
+  {
+    title: "The Airbnb Story",
+    pages: 256,
+    author: "Leigh Gallagher",
+    details: {
+      language: "English",
+      description: "This is the remarkable behind-the-scenes story of the creation and growth of Airbnb..."
+    }
+  },
+  {
+    title: "Educated - A Memoir",
+    pages: 352,
+    author: "Tara Westover",
+    details: {
+      language: "English",
+      description: "Educated is an account of the struggle for self-invention..."
+    }
+  },
+  {
+    title: "The Art of Learning",
+    pages: 288,
+    author: "Josh Waitzkin",
+    details: {
+      language: "English",
+      description: "The Art of Learning takes readers through Waitzkin's unique journey to excellence. He explains in clear detail how a well-thought-out, principled approach to learning is what separates success from failure."
+    }
+  }
+];
 
 
 
 
-// Iteration 2 | Book Details
-function getBookDetails() {
-  // Your code here:
 
+// Iteration 2 | Book Details
+function getBookDetails(book) {
+  return (book.title + " - " + book.author + " - " + book.pages + " pages");
 }
 
+console.log(getBookDetails(booksArray[0])); //test
+ 
 
 
 // Iteration 3 | Delete Language
 // Your code here:
-
+booksArray.forEach(book => {
+  delete book.details.language;
+});
 
 
 
 // Iteration 4 | Estimated Reading Time
 // Your code here:
-
+booksArray.forEach(book => {
+  book.readingTime = Math.ceil(book.pages * 500 / 90); 
+});
 
 
 
@@ -86,15 +129,27 @@ const dictionary = {
     ],
 };
 
-function booksByAuthor() {
+function booksByAuthor(dictionary) {
   // Your code here:
-  
-}
-
-
+  newArray = [];
+  for(const author in dictionary){
+    dictionary[author].forEach(book => {
+        newArray.push({
+          author: author,
+          title: book[0],
+          pages: book[1]
+        });
+      });
+    }
+    return newArray;
+  }
 
 // Bonus: Iteration 6 | Average Page Count
-function averagePageCount() {
-  // Your code here:
+function averagePageCount(booksArray) {
+  // Your code here:booksArray.forEach(book => {
+    var averagePage = 0;
+    for(var i = 0; i < booksArray.length; i++){
+      averagePage += booksArray[i].pages;
+    } return averagePage / booksArray.length;
   
 }