Experiment7 Updated

-function addPrice(amount) {
+function addPrice(amount) {
     this.price = amount;
 }
 function book(title, author) {
@@ -13,6 +13,7 @@ console.log(bookList);
 console.log("After Sorting");
 bookList.sort(sortBook);
 // sortBook 이라는 comparing function을 완성하시오.
+// sortBook(a, b) { if (a > b) return 1; else if (a < b) return -1; else return 0;
 // 1 순위 : title
 // 2 순위 : author
 console.log(bookList);