diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 75ce6c1d..a0a425f3 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -33,12 +33,14 @@ function submit() {
     title.value == "" ||
     pages.value == null ||
     pages.value == ""
+    || author.value == null ||
+    author.value == ""
   ) {
     alert("Please fill all fields!");
     return false;
   } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
+    let book = new Book(title.value, author.value, pages.value, check.checked);
+    myLibrary.push(book);
     render();
   }
 }
@@ -54,7 +56,7 @@ function render() {
   let table = document.getElementById("display");
   let rowsNumber = table.rows.length;
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n-- {
+  for (let n = rowsNumber - 1; n > 0; n-- ) {
     table.deleteRow(n);
   }
   //insert updated row and cells
@@ -76,7 +78,7 @@ function render() {
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
-    if (myLibrary[i].check == false) {
+    if (myLibrary[i].check) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
@@ -90,14 +92,16 @@ function render() {
 
     //add delete button to every row and render again
     let delButton = document.createElement("button");
-    delBut.id = i + 5;
-    deleteCell.appendChild(delBut);
-    delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
-      myLibrary.splice(i, 1);
-      render();
+    delButton.id = i + 5;
+    deleteCell.appendChild(delButton);
+    delButton.className = "btn btn-warning";
+    delButton.innerHTML = "Delete";
+    delButton.addEventListener("click", function () {
+      const index = parseInt(this.id) - 5; // get index from button id
+      if (confirm(`Are you sure you want to delete "${myLibrary[index].title}"?`)) {
+        myLibrary.splice(index, 1);
+        render();
+      }
     });
   }
 }