diff --git a/src/books.js b/src/books.js
index c8119bb..0f1f5b2 100644
--- a/src/books.js
+++ b/src/books.js
@@ -38,14 +38,51 @@
 
 
 // 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: "Leight 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:
+function getBookDetails(book) {
+  return `${book.title} - ${book.author} - ${book.pages} pages`
 
 }
 
@@ -53,13 +90,22 @@ function getBookDetails() {
 
 // Iteration 3 | Delete Language
 // Your code here:
+for (const book of booksArray) {
+  delete book.details.language
+}
 
+console.log(booksArray)
 
 
 
 // Iteration 4 | Estimated Reading Time
 // Your code here:
+for (const book of booksArray) {
+  const time = Math.ceil((book.pages * 500) / 90)
+  book.readingTime = time
+}
 
+console.log(booksArray)
 
 
 
@@ -69,32 +115,57 @@ function getBookDetails() {
  The book info is stored in arrays with structure: [title, pages]. 
 */
 const dictionary = {
-    "J. K. Rowling": [
-        ["Harry Potter and the Philosopher's Stone", 223],
-        ["Harry Potter and the Chamber of Secrets", 251],
-        ["Harry Potter and the Prisoner of Azkaban", 317],
-        ["Harry Potter and the Goblet of Fire", 636],
-    ],
-    "Neal Stephenson": [
-        ["Cryptonomicon", 928],
-        ["Anathem", 1008],
-        ["Fall; or, Dodge in Hell", 896],
-    ],
-    "Malcolm Gladwell": [
-        ["Outliers", 320],
-        ["Blink", 287],
-    ],
+  "J. K. Rowling": [
+    ["Harry Potter and the Philosopher's Stone", 223],
+    ["Harry Potter and the Chamber of Secrets", 251],
+    ["Harry Potter and the Prisoner of Azkaban", 317],
+    ["Harry Potter and the Goblet of Fire", 636],
+  ],
+  "Neal Stephenson": [
+    ["Cryptonomicon", 928],
+    ["Anathem", 1008],
+    ["Fall; or, Dodge in Hell", 896],
+  ],
+  "Malcolm Gladwell": [
+    ["Outliers", 320],
+    ["Blink", 287],
+  ],
 };
 
-function booksByAuthor() {
+function booksByAuthor(dictionary) {
   // Your code here:
-  
+  let bookArr = [] // Create the bookArr that will contain the objects
+
+  for (const author in dictionary) { // Iterate through the dictionnary obj using for in loop
+    const booksAuthor = dictionary[author] // get the value of the obj properties - return an array
+
+    for (book of booksAuthor) { // Iterate through this array that contains the books group by author
+      const bookObj = { // Create an empty object bookObj that will contain the informations of each book
+        title: book[0], // Since the array books contain nested arrays - get the value of thoses nested arrays - the title of the book
+        pages: book[1], // The number of pages of the book
+        author: author // Get the author name attached to the book
+      }
+      bookArr.push(bookObj) // Push the new bookObj with properties title, pages and author to the bookArr array
+
+    }
+  }
+  return bookArr // Return the bookArr array that contains books objects
 }
 
+booksByAuthor(dictionary)
 
 
 // Bonus: Iteration 6 | Average Page Count
-function averagePageCount() {
+function averagePageCount(bookArr) {
   // Your code here:
-  
+  if(!bookArr.length){
+    return null
+  }
+  let sumPages = 0;
+  const numberOfBooks = bookArr.length
+  for (const bookObj of bookArr) {
+    sumPages += bookObj.pages
+  }
+  const averagePages = sumPages / numberOfBooks
+  return averagePages
 }