diff --git a/main.js b/main.js
index 220d2e1..f52ff3f 100644
--- a/main.js
+++ b/main.js
@@ -1 +1,73 @@
-// write your code here to make the tests pass
+let Library = function () {
+  let books = [];
+
+  let addBook = function (bookToAdd) {
+    books.push(bookToAdd);
+    // bookToAdd.setAttribute("checkedOut", false);
+    // console.log("adding", book.getAttribute("title"));
+  };
+
+  let checkOutBook = function (bookToCheckOut) {
+    // console.log(`Checkingout! ${bookToCheckOut.getAttribute('title')}`);
+    if (
+      books.find(function (book) {
+        // console.log(book.getAttribute('title'), bookToCheckOut.getAttribute('title'));
+        return (
+          book.getAttribute("title") === bookToCheckOut.getAttribute("title")
+        );
+      })
+    ) {
+      console.log("passed & book can be checked out!");
+      bookToCheckOut.setAttribute("checkedOut", true);
+      // console.log(`checkingOut ${bookToCheckOut} & checkedOut is ${book.getAttribute('checkedOut')}`)
+    } else {
+      console.log("This book is not available to loan.");
+    }
+  };
+
+  let returnBook = function (bookToReturn) {
+    console.log(`return: ${bookToReturn.getAttribute("title")}`);
+    if (
+      books.find(function (book) {
+        // console.log(book.getAttribute('title'), bookToCheckOut.getAttribute('title'));
+        return (
+          book.getAttribute("title") === bookToReturn.getAttribute("title")
+        );
+      })
+    ) {
+      console.log("passed & book can be returned!");
+      bookToReturn.setAttribute("checkedOut", false);
+    } else {
+      console.log("This is not one of our library's books.");
+    }
+  };
+
+  return {
+    addBook: addBook,
+    checkOutBook: checkOutBook,
+    returnBook: returnBook,
+  };
+};
+
+let Book = function (titleNew, authorNew) {
+  let attributes = {
+    title: titleNew,
+    author: authorNew,
+    checkedOut: false,
+  };
+
+  let getAttribute = function (attributeOfInterest) {
+    return attributes[attributeOfInterest];
+  };
+
+  let setAttribute = function (attributeOfInterest, value) {
+    if (attributes[attributeOfInterest] != undefined) {
+      attributes[attributeOfInterest] = value;
+    }
+  };
+
+  return {
+    getAttribute: getAttribute,
+    setAttribute: setAttribute,
+  };
+};