finish all modules

main.js

@@ -1 +1,69 @@
 // write your code here to make the tests pass
+let Library = () => {
+    let books = [];
+
+    let addBook = (bookToAdd) => {
+        // takes book title as an argument and pushes that title to the books array
+        books.push(bookToAdd);
+    };
+
+    let checkOutBook = (bookToCheckout) => {
+        // takes a book object as an argument and changes its checkedOut attribute to true, but only if that 
+        // book exists in the library , else console log an error 'this book is not available'
+        if (books.includes(bookToCheckout)/* && bookToCheckout.checkedOut === false*/) {
+            bookToCheckout.setAttribute('checkedOut', true);
+        }
+        else {
+            console.log(`${bookToCheckout} book is not available`)  
+        };
+
+    };
+
+    let returnBook = (bookToReturn) => {
+        // takes a book object as an argument and changes its checkedOut attribute to false, but only if that
+        // book exists in the library 
+        if (/*attributes.checkedOut === true &&*/ books.includes(bookToReturn)) {
+            bookToReturn.setAttribute('checkedOut', false);
+        }
+        else {
+            console.log(`${bookToReturn} book is not available`) 
+        };
+    }
+    return {
+    addBook: addBook,
+    checkOutBook: checkOutBook,
+    returnBook: returnBook
+    }
+};
+
+
+
+let Book = (title, author) => {
+    let attributes = {
+        title: title,
+        author: author,
+        checkedOut: false
+    };
+
+    let getAttribute = (attributeKey) => {
+        // returns the attribute value with the name from the interal attributes
+        // if (attributes[attributeKey]) {
+            return attributes[attributeKey];
+        // }
+
+    }
+
+    let setAttribute = (attributeKey, attributeValue) => {
+        console.log('inside setAttribute with attributeName', attributeKey, 'attributeValue', attributeValue)
+        // check to see if the attributeKey exists on the attributes object
+        if (attributes[attributeKey] != undefined) {
+            // set the attribute value to the property given by attributeValue
+                attributes[attributeKey] = attributeValue;
+        }
+
+    }
+    return {
+        setAttribute: setAttribute,
+        getAttribute: getAttribute
+    }
+};