add Book and Library functions

main.js

@@ -1 +1,74 @@
 // write your code here to make the tests pass
+var Library = function() {
+    var books = [];
+
+    var addBook = function(book) {
+        books.push(book);
+    }
+
+    var checkOutBook = function(book) {
+      for (var i = 0; i < books.length; i ++) {
+        if (books[i].getAttribute('title') == book.getAttribute('title')) {
+          if (book.getAttribute('checkedOut') == false) {
+            book.setAttribute('checkedOut', true)
+          } else {
+              console.log('Booked already checked out')
+          }
+        } else (
+          console.log("Book not in library!")
+        )
+      }
+    }
+
+    var returnBook = function(book) {
+        for (var i = 0; i < books.length; i ++) {
+          if (books[i].getAttribute('title') == book.getAttribute('title')) {
+            if (book.getAttribute('checkedOut') == true) {
+              book.setAttribute('checkedOut', false)
+            }
+          } else (
+            console.log("Book not in library!")
+          )
+        }
+      }
+
+    return {
+        addBook: addBook,
+        checkOutBook: checkOutBook,
+        returnBook: returnBook
+    }
+}
+
+var Book = function(title, author, checkedOut) {
+
+    var attributes = {
+        title: title,
+        author: author,
+        checkedOut: false
+    };
+
+    var getAttribute = function(attribute) {
+      if (attribute in attributes) {
+        return attributes[attribute];
+      } else {
+          console.log("Book does not have this attribute!")
+      }
+    };
+
+    var setAttribute = function(attribute, value) {
+      if (attribute in attributes) {
+        attributes[attribute] = value;
+      }
+    };
+
+    return {
+        getAttribute: getAttribute,
+        setAttribute: setAttribute
+    };
+};
+
+
+var library = Library()
+
+var hungerGames = Book("Hunger Games", "Suzanna Collins");
+library.addBook(hungerGames);