diff --git a/src/books.js b/src/books.js
index c8119bb..7e1d455 100644
--- a/src/books.js
+++ b/src/books.js
@@ -36,32 +36,73 @@
 //    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.
 // }
 
-
-// Your code here:
 const booksArray = [];
+let book1 = {
+  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..",
+  },
+};
 
+let book2 = {
+  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...",
+  },
+};
+let book3 = {
+  title: "Educated - A Memoir",
+  pages: 352,
+  author: "Tara Westover",
+  details: {
+    language: "English",
+    description: "Educated is an account of the struggle for self-invention...",
+  },
+};
 
-
+let book4 = {
+  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.",
+  },
+};
+booksArray.push(book1, book2, book3, book4);
 
 // Iteration 2 | Book Details
-function getBookDetails() {
-  // Your code here:
-
+function getBookDetails(book1) {
+  let str = `${book1.title} - ${book1.author} - ${book1.pages} pages`;
+  return str;
 }
 
-
+getBookDetails(book1);
 
 // Iteration 3 | Delete Language
-// Your code here:
-
-
+let booksArray2 = booksArray;
 
+// Your code here:
+for (let i = 0; i < booksArray2.length; i++) {
+  delete booksArray2[i].details.language;
+}
 
 // Iteration 4 | Estimated Reading Time
 // Your code here:
+for (let i = 0; i < booksArray.length; i++) {
+  booksArray[i].readingTime = Math.ceil((booksArray[i].pages * 500) / 90);
+}
 
-
-
+console.log(booksArray);
 
 // Bonus: Iteration 5 | Books Dictionary
 
@@ -69,32 +110,47 @@ 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() {
+[{ title: "Outliers", pages: 320, author: "Malcolm Gladwell" }, {}];
+
+function booksByAuthor(dictionary) {
   // Your code here:
-  
+  let newArr = [];
+  let authorNames = Object.keys(dictionary);
+  for (let i = 0; i < authorNames.length; i++) {
+    let authorName = authorNames[i];
+    let booksOfAuthor = dictionary[authorName];
+    for (let j = 0; j < booksOfAuthor.length; j++) {
+      let book = booksOfAuthor[j];
+      newArr.push({ title: book[0], pages: book[1], author: authorName });
+    }
+  }
+  return newArr;
 }
 
-
-
 // Bonus: Iteration 6 | Average Page Count
-function averagePageCount() {
+function averagePageCount(booksArray) {
   // Your code here:
-  
+  let sum = 0;
+  for (let i = 0; i < booksArray.length; i++) {
+    sum += booksArray[i].pages;
+  }
+  let avg = sum / booksArray.length;
+  return avg;
 }