Debugged the code

Author: HilolaRustam

debugging/book-library/script.js

@@ -1,19 +1,17 @@
 let myLibrary = [];
 
 window.addEventListener("load", function (e) {
-  populateStorage();
+if (localStorage.getItem("myLibrary")) {
+    myLibrary = JSON.parse(localStorage.getItem("myLibrary"));
+  } else {
+    populateStorage();
+  }
   render();
 });
-
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
-    let book2 = new Book(
-      "The Old Man and the Sea",
-      "Ernest Hemingway",
-      "127",
-      true
-    );
+    let book1 = new Book("Robinson Crusoe", "Daniel Defoe", "252", true);
+    let book2 = new Book("The Old Man and the Sea", "Ernest Hemingway", "127", true);
     myLibrary.push(book1);
     myLibrary.push(book2);
     render();
@@ -31,36 +29,40 @@ function submit() {
   if (
     title.value == null ||
     title.value == "" ||
+    author.value == null ||
+    author.value == "" ||
     pages.value == null ||
     pages.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();
   }
 }
 
-function Book(title, author, pages, check) {
-  this.title = title;
-  this.author = author;
-  this.pages = pages;
-  this.check = check;
+class Book {
+  constructor(title, author, pages, check) {
+    this.title = title;
+    this.author = author;
+    this.pages = pages;
+    this.check = check;
+  }
 }
 
 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
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
+    let row = table.insertRow(-1);
     let titleCell = row.insertCell(0);
     let authorCell = row.insertCell(1);
     let pagesCell = row.insertCell(2);
@@ -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 == true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
@@ -89,15 +91,15 @@ function render() {
     });
 
     //add delete button to every row and render again
-    let delButton = document.createElement("button");
+    let delBut = document.createElement("button");
     delBut.id = i + 5;
     deleteCell.appendChild(delBut);
     delBut.className = "btn btn-warning";
     delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delBut.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
     });
   }
-}
+}