From d7e7b4c954ca733135bda1a2bccde2af14f645de Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 17:47:07 +0100
Subject: [PATCH 01/19] fix error in render function for loo closing missing
 closing bracket

---
 debugging/book-library/script.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 75ce6c1d..222d0b76 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,5 +1,5 @@
 let myLibrary = [];
-
+it 
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
@@ -54,7 +54,7 @@ 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

From 11e500e7c6063c51b7ec3bfdec3880e682efff97 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 19:15:19 +0100
Subject: [PATCH 02/19] update delete button

---
 debugging/book-library/script.js | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 222d0b76..21e79ebf 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,5 +1,4 @@
 let myLibrary = [];
-it 
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
@@ -38,7 +37,7 @@ function submit() {
     return false;
   } else {
     let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
+    myLibrary.push(book);
     render();
   }
 }
@@ -89,7 +88,7 @@ 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";
@@ -101,3 +100,18 @@ function render() {
     });
   }
 }
+// My website should be able to:
+
+// - View a list of books that I've read
+// - Add books to a list of books that I've read
+// - Including title, author, number of pages and if I've read it
+// - If any of the information is missing it shouldn't add the book and should show an alert
+// - Remove books from my list
+
+// ## Bugs to be fixed
+
+// 1. Website loads but doesn't show any books
+// 2. Error in console when you try to add a book
+// 3. It uses the title name as the author name
+// 4. Delete button is broken
+// 5. When I add a book that I say I've read - it saves the wrong answer
\ No newline at end of file

From de9d89d280d60bb2fd874de45fb9e66cff2f9ff0 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 20:55:46 +0100
Subject: [PATCH 03/19] update add book function and inputs

---
 debugging/book-library/index.html |  2 +-
 debugging/book-library/script.js  | 13 +++++++++----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 23acfa71..e24a68f3 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -65,7 +65,7 @@ <h1>Library</h1>
           type="submit"
           value="Submit"
           class="btn btn-primary"
-          onclick="submit();"
+          id ="submit-btn"
         />
       </div>
     </div>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 21e79ebf..2c35bb52 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -15,7 +15,6 @@ function populateStorage() {
     );
     myLibrary.push(book1);
     myLibrary.push(book2);
-    render();
   }
 }
 
@@ -23,6 +22,12 @@ const title = document.getElementById("title");
 const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
+const submitBtn = document.getElementById("submit-btn");
+
+submitBtn.addEventListener("click", function (event) {
+  event.preventDefault();
+  submit();
+});
 
 //check the right input from forms and if its ok -> add the new book (object in array)
 //via Book function and start render function
@@ -36,7 +41,7 @@ function submit() {
     alert("Please fill all fields!");
     return false;
   } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
+    let book = new Book(title.value, author.value, pages.value, check.checked);
     myLibrary.push(book);
     render();
   }
@@ -55,7 +60,7 @@ function render() {
   //delete old table
   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++) {
@@ -110,7 +115,7 @@ function render() {
 
 // ## Bugs to be fixed
 
-// 1. Website loads but doesn't show any books
+// 1. Website loads but doesn't show any books => fixed
 // 2. Error in console when you try to add a book
 // 3. It uses the title name as the author name
 // 4. Delete button is broken

From 3dadc55f78fa39a9b252720f0bb2844aa4c32133 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 21:35:49 +0100
Subject: [PATCH 04/19] fixed delete button

---
 debugging/book-library/script.js | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 2c35bb52..31ec0fd4 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -81,9 +81,9 @@ function render() {
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
     if (myLibrary[i].check == false) {
-      readStatus = "Yes";
-    } else {
       readStatus = "No";
+    } else {
+      readStatus = "Yes";
     }
     changeBut.innerText = readStatus;
 
@@ -98,7 +98,7 @@ function render() {
     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();
@@ -116,7 +116,7 @@ function render() {
 // ## Bugs to be fixed
 
 // 1. Website loads but doesn't show any books => fixed
-// 2. Error in console when you try to add a book
-// 3. It uses the title name as the author name
-// 4. Delete button is broken
-// 5. When I add a book that I say I've read - it saves the wrong answer
\ No newline at end of file
+// 2. Error in console when you try to add a book => fixed
+// 3. It uses the title name as the author name => fixed
+// 4. Delete button is broken =>git 
+// 5. When I add a book that I say I've read - it saves the wrong answer => 
\ No newline at end of file

From 9fb77a91e8f2ff8478f497b30d537693bdc99d04 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 21:37:23 +0100
Subject: [PATCH 05/19] removed unused comment

---
 debugging/book-library/script.js | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 31ec0fd4..9537130d 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -105,18 +105,3 @@ function render() {
     });
   }
 }
-// My website should be able to:
-
-// - View a list of books that I've read
-// - Add books to a list of books that I've read
-// - Including title, author, number of pages and if I've read it
-// - If any of the information is missing it shouldn't add the book and should show an alert
-// - Remove books from my list
-
-// ## Bugs to be fixed
-
-// 1. Website loads but doesn't show any books => fixed
-// 2. Error in console when you try to add a book => fixed
-// 3. It uses the title name as the author name => fixed
-// 4. Delete button is broken =>git 
-// 5. When I add a book that I say I've read - it saves the wrong answer => 
\ No newline at end of file

From da350c1b05e012bd77dcc1db519b2fb3838225ea Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 22:06:37 +0100
Subject: [PATCH 06/19] unco changes in html

---
 debugging/book-library/script.js | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 9537130d..a8b24945 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -105,3 +105,21 @@ function render() {
     });
   }
 }
+<<<<<<< HEAD
+=======
+// My website should be able to:
+
+// - View a list of books that I've read
+// - Add books to a list of books that I've read
+// - Including title, author, number of pages and if I've read it
+// - If any of the information is missing it shouldn't add the book and should show an alert
+// - Remove books from my list
+
+// ## Bugs to be fixed
+
+// 1. Website loads but doesn't show any books => fixed
+// 2. Error in console when you try to add a book => fixed
+// 3. It uses the title name as the author name => fixed
+// 4. Delete button is broken =>git 
+// 5. When I add a book that I say I've read - it saves the wrong answer => 
+>>>>>>> c637046 (unco changes in html)

From 2132c95b8f03a4960604cb1e437d4973ec040b62 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Wed, 15 Apr 2026 22:56:11 +0100
Subject: [PATCH 07/19] removed unused comment

---
 debugging/book-library/script.js | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index a8b24945..c7da752c 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -105,21 +105,4 @@ function render() {
     });
   }
 }
-<<<<<<< HEAD
-=======
-// My website should be able to:
 
-// - View a list of books that I've read
-// - Add books to a list of books that I've read
-// - Including title, author, number of pages and if I've read it
-// - If any of the information is missing it shouldn't add the book and should show an alert
-// - Remove books from my list
-
-// ## Bugs to be fixed
-
-// 1. Website loads but doesn't show any books => fixed
-// 2. Error in console when you try to add a book => fixed
-// 3. It uses the title name as the author name => fixed
-// 4. Delete button is broken =>git 
-// 5. When I add a book that I say I've read - it saves the wrong answer => 
->>>>>>> c637046 (unco changes in html)

From 856dff76bc4f427dfd0f1018ab68297a963a542f Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Fri, 17 Apr 2026 18:37:19 +0100
Subject: [PATCH 08/19] validate html code

---
 debugging/book-library/index.html | 146 ++++++++++++------------------
 debugging/book-library/script.js  |   1 +
 2 files changed, 58 insertions(+), 89 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index e24a68f3..87bd1542 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -1,96 +1,64 @@
 <!DOCTYPE html>
-<html>
-  <head>
-    <title> </title>
-    <meta
-      charset="utf-8"
-      name="viewport"
-      content="width=device-width, initial-scale=1.0"
-    />
-    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
-    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
-    <link
-      rel="stylesheet"
-      href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
-    />
-    <link rel="stylesheet" type="text/css" href="style.css" />
-  </head>
+<html lang="en">
 
-  <body>
-    <div class="jumbotron text-center">
-      <h1>Library</h1>
-      <p>Add books to your virtual library</p>
-    </div>
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>Book Library</title>
+  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
+  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
+  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" />
+  <link rel="stylesheet" type="text/css" href="style.css" />
+</head>
+
+<body>
+  <div class="jumbotron text-center">
+    <h1>Library</h1>
+    <p>Add books to your virtual library</p>
+  </div>
 
-    <button data-toggle="collapse" data-target="#demo" class="btn btn-info">
-      Add new book
-    </button>
+  <button data-toggle="collapse" data-target="#demo" class="btn btn-info">
+    Add new book
+  </button>
 
-    <div id="demo" class="collapse">
-      <div class="form-group">
-        <label for="title">Title:</label>
-        <input
-          type="title"
-          class="form-control"
-          id="title"
-          name="title"
-          required
-        />
-        <label for="author">Author: </label>
-        <input
-          type="author"
-          class="form-control"
-          id="author"
-          name="author"
-          required
-        />
-        <label for="pages">Pages:</label>
-        <input
-          type="number"
-          class="form-control"
-          id="pages"
-          name="pages"
-          required
-        />
-        <label class="form-check-label">
-          <input
-            type="checkbox"
-            class="form-check-input"
-            id="check"
-            value=""
-          />Read
-        </label>
-        <input
-          type="submit"
-          value="Submit"
-          class="btn btn-primary"
-          id ="submit-btn"
-        />
-      </div>
+  <div id="demo" class="collapse">
+    <div class="form-group">
+      <label for="title">Title:</label>
+      <input type="text" class="form-control" id="title" name="title" required />
+      <label for="author">Author: </label>
+      <input type="text" class="form-control" id="author" name="author" required />
+      <label for="pages">Pages:</label>
+      <input type="number" class="form-control" id="pages" name="pages" required />
+      <label class="form-check-label">
+        <input type="checkbox" class="form-check-input" id="check" value="" />Read
+      </label>
+      <input type="submit" value="Submit" class="btn btn-primary" id="submit-btn" />
     </div>
+  </div>
+
+  <table class="table" id="display">
+    <thead class="thead-dark">
+      <tr>
+        <th>Title</th>
+        <th>Author</th>
+        <th>Number of Pages</th>
+        <th>Read</th>
+        <th></th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td></td>
+        <td></td>
+        <td></td>
+        <td></td>
+        <td></td>
+      </tr>
+    </tbody>
+  </table>
 
-    <table class="table" id="display">
-      <thead class="thead-dark">
-        <tr>
-          <th>Title</th>
-          <th>Author</th>
-          <th>Number of Pages</th>
-          <th>Read</th>
-          <th></th>
-        </tr>
-      </thead>
-      <tbody>
-        <tr>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-          <td></td>
-        </tr>
-      </tbody>
-    </table>
+  <script src="script.js"></script>
+</body>
 
-    <script src="script.js"></script>
-  </body>
-</html>
+</html>
\ No newline at end of file
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index c7da752c..6e577ada 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -106,3 +106,4 @@ function render() {
   }
 }
 
+

From 341fdedcb356156e0750af3b4b8a3dad4aaa6bad Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Fri, 17 Apr 2026 18:52:28 +0100
Subject: [PATCH 09/19]  refactor page count with number type and update
 element variable names

---
 debugging/book-library/index.html |  2 +-
 debugging/book-library/script.js  | 26 +++++++++++++-------------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 87bd1542..55d58a46 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -58,7 +58,7 @@ <h1>Library</h1>
     </tbody>
   </table>
 
-  <script src="script.js"></script>
+  <script src="script.js" type="module"></script>
 </body>
 
 </html>
\ No newline at end of file
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 6e577ada..fd25116d 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -6,11 +6,11 @@ window.addEventListener("load", function (e) {
 
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
+    let book1 = new Book("Robison Crusoe", "Daniel Defoe", 252, true);
     let book2 = new Book(
       "The Old Man and the Sea",
       "Ernest Hemingway",
-      "127",
+      127,
       true
     );
     myLibrary.push(book1);
@@ -18,13 +18,13 @@ function populateStorage() {
   }
 }
 
-const title = document.getElementById("title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
-const submitBtn = document.getElementById("submit-btn");
+const titleEl = document.getElementById("title");
+const authorEl = document.getElementById("author");
+const pagesEl = document.getElementById("pages");
+const checkEl = document.getElementById("check");
+const submitBtnEl = document.getElementById("submit-btn");
 
-submitBtn.addEventListener("click", function (event) {
+submitBtnEl.addEventListener("click", function (event) {
   event.preventDefault();
   submit();
 });
@@ -33,15 +33,15 @@ submitBtn.addEventListener("click", function (event) {
 //via Book function and start render function
 function submit() {
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
+    titleEl.value == null ||
+    titleEl.value == "" ||
+    pagesEl.value == null ||
+    pagesEl.value == ""
   ) {
     alert("Please fill all fields!");
     return false;
   } else {
-    let book = new Book(title.value, author.value, pages.value, check.checked);
+    let book = new Book(titleEl.value, authorEl.value, pagesEl.value, checkEl.checked);
     myLibrary.push(book);
     render();
   }

From 2a37c415da83690cbb26d9e21defd144282acb1a Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Sat, 18 Apr 2026 12:01:38 +0100
Subject: [PATCH 10/19] refactor submit function by using logical NOT to
 validate input

---
 debugging/book-library/index.html | 3 ++-
 debugging/book-library/script.js  | 7 +++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 55d58a46..5f381d06 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -61,4 +61,5 @@ <h1>Library</h1>
   <script src="script.js" type="module"></script>
 </body>
 
-</html>
\ No newline at end of file
+</html>
+
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index fd25116d..0f77880d 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -33,10 +33,9 @@ submitBtnEl.addEventListener("click", function (event) {
 //via Book function and start render function
 function submit() {
   if (
-    titleEl.value == null ||
-    titleEl.value == "" ||
-    pagesEl.value == null ||
-    pagesEl.value == ""
+    !titleEl.value || 
+    !authorEl.value || 
+    !pagesEl.value
   ) {
     alert("Please fill all fields!");
     return false;

From 3ba292d023c019c82367e94e8d5f9c032c8acd4a Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Sat, 18 Apr 2026 12:57:56 +0100
Subject: [PATCH 11/19] add html input validation

---
 .vscode/settings.json             | 3 +++
 debugging/book-library/index.html | 8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)
 create mode 100644 .vscode/settings.json

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 00000000..30de70fe
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "editor.acceptSuggestionOnEnter": "on"
+}
\ No newline at end of file
diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 5f381d06..e554b011 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -25,16 +25,16 @@ <h1>Library</h1>
   <div id="demo" class="collapse">
     <div class="form-group">
       <label for="title">Title:</label>
-      <input type="text" class="form-control" id="title" name="title" required />
+      <input type="text" class="form-control" id="title" name="title" placeholder="Enter book title..." required />
       <label for="author">Author: </label>
-      <input type="text" class="form-control" id="author" name="author" required />
+      <input type="text" class="form-control" id="author" name="author" placeholder="Enter author's name..." required />
       <label for="pages">Pages:</label>
-      <input type="number" class="form-control" id="pages" name="pages" required />
+      <input type="number" class="form-control" id="pages" name="pages"  min ="1" placeholder="Enter number of pages..." />
       <label class="form-check-label">
         <input type="checkbox" class="form-check-input" id="check" value="" />Read
       </label>
       <input type="submit" value="Submit" class="btn btn-primary" id="submit-btn" />
-    </div>
+    </div>  
   </div>
 
   <table class="table" id="display">

From fa04d30b138feed6bbbabe904c54635b2605a33b Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Mon, 20 Apr 2026 19:14:46 +0100
Subject: [PATCH 12/19] add efficient approach to remove rows in table, add
 delete all button , add alert message after book deletion

---
 debugging/book-library/script.js | 61 ++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 23 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 0f77880d..714106f7 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -6,8 +6,8 @@ window.addEventListener("load", function (e) {
 
 function populateStorage() {
   if (myLibrary.length == 0) {
-    let book1 = new Book("Robison Crusoe", "Daniel Defoe", 252, true);
-    let book2 = new Book(
+    const book1 = new Book("Robison Crusoe", "Daniel Defoe", 252, true);
+    const book2 = new Book(
       "The Old Man and the Sea",
       "Ernest Hemingway",
       127,
@@ -40,7 +40,7 @@ function submit() {
     alert("Please fill all fields!");
     return false;
   } else {
-    let book = new Book(titleEl.value, authorEl.value, pagesEl.value, checkEl.checked);
+    const book = new Book(titleEl.value, authorEl.value, pagesEl.value, checkEl.checked);
     myLibrary.push(book);
     render();
   }
@@ -53,13 +53,19 @@ function Book(title, author, pages, check) {
   this.check = check;
 }
 
+function showMessage(text) {
+   const msg = document.createElement("p");
+   msg.textContent = text;
+   document.body.appendChild(msg);
+
+   setTimeout(() => msg.remove(), 2000);
+}
 function render() {
-  let table = document.getElementById("display");
-  let rowsNumber = table.rows.length;
+  const table = document.getElementById("display");
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n--){
-    table.deleteRow(n);
-    }
+  while (table.rows.length > 1) {
+    table.deleteRow(1);
+  }
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
@@ -69,40 +75,49 @@ function render() {
     let pagesCell = row.insertCell(2);
     let wasReadCell = row.insertCell(3);
     let deleteCell = row.insertCell(4);
-    titleCell.innerHTML = myLibrary[i].title;
-    authorCell.innerHTML = myLibrary[i].author;
-    pagesCell.innerHTML = myLibrary[i].pages;
+    titleCell.textContent = myLibrary[i].title;
+    authorCell.textContent = myLibrary[i].author;
+    pagesCell.textContent = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
-    let changeBut = document.createElement("button");
+    const changeBut = document.createElement("button");
     changeBut.id = i;
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
-    let readStatus = "";
-    if (myLibrary[i].check == false) {
-      readStatus = "No";
-    } else {
-      readStatus = "Yes";
-    }
-    changeBut.innerText = readStatus;
-
+    changeBut.innerText = myLibrary[i].check ? "Yes" : "No";
     changeBut.addEventListener("click", function () {
       myLibrary[i].check = !myLibrary[i].check;
       render();
     });
 
     //add delete button to every row and render again
-    let delBut = document.createElement("button");
+    const delBut = document.createElement("button");
     delBut.id = i + 5;
     deleteCell.appendChild(delBut);
     delBut.className = "btn btn-warning";
     delBut.innerHTML = "Delete";
     delBut.addEventListener("click", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
+      const deletedTitle = myLibrary[i].title;
       myLibrary.splice(i, 1);
       render();
+      showMessage(`You've deleted: ${deletedTitle}`);
     });
-  }
+    }
 }
 
+const deleteAllBtn = document.createElement("button");
+deleteAllBtn.textContent = "Delete All";
+deleteAllBtn.className = "btn btn-danger";
+document.body.appendChild(deleteAllBtn);
+deleteAllBtn.addEventListener("click", function () {
+  if (myLibrary.length === 0) return;
+
+  const count = myLibrary.length;
+
+  myLibrary.length = 0; // clear all
+  deleteAllBtn.disabled = myLibrary.length === 0;
+  render();
+
+  showMessage(`Deleted all ${count} books`);
+});
 

From fc525cebc3fc69dff9df816cff3fbcda76f89ca2 Mon Sep 17 00:00:00 2001
From: marthak1 <marthaogunbiyi196@gmail.com>
Date: Mon, 20 Apr 2026 19:35:12 +0100
Subject: [PATCH 13/19] add form validation in js

---
 debugging/book-library/script.js | 34 ++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 714106f7..6d3cbdcc 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -32,18 +32,32 @@ submitBtnEl.addEventListener("click", function (event) {
 //check the right input from forms and if its ok -> add the new book (object in array)
 //via Book function and start render function
 function submit() {
-  if (
-    !titleEl.value || 
-    !authorEl.value || 
-    !pagesEl.value
-  ) {
+  const title = titleEl.value.trim();
+  const author = authorEl.value.trim();
+  const pagesRaw = pagesEl.value.trim();
+
+  if (!title || !author || !pagesRaw) {
     alert("Please fill all fields!");
-    return false;
-  } else {
-    const book = new Book(titleEl.value, authorEl.value, pagesEl.value, checkEl.checked);
-    myLibrary.push(book);
-    render();
+    return;
+  }
+
+  const pages = Number(pagesRaw);
+
+  if (!Number.isInteger(pages) || pages <= 0) {
+    alert("Pages must be a positive number");
+    return;
   }
+
+  const book = new Book(title, author, pages, checkEl.checked);
+
+  myLibrary.push(book);
+  render();
+
+  // clear form
+  titleEl.value = "";
+  authorEl.value = "";
+  pagesEl.value = "";
+  checkEl.checked = false;
 }
 
 function Book(title, author, pages, check) {

From da4c5db894308eee69d0eecd38fec880b8e1aa7e Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Mon, 20 Apr 2026 19:49:06 +0100
Subject: [PATCH 14/19] Delete .vscode/settings.json

---
 .vscode/settings.json | 3 ---
 1 file changed, 3 deletions(-)
 delete mode 100644 .vscode/settings.json

diff --git a/.vscode/settings.json b/.vscode/settings.json
deleted file mode 100644
index 30de70fe..00000000
--- a/.vscode/settings.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "editor.acceptSuggestionOnEnter": "on"
-}
\ No newline at end of file

From b7cf82893a635955d61af193005f129be2396304 Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Tue, 21 Apr 2026 19:30:18 +0100
Subject: [PATCH 15/19] Refactor element retrieval and library initialization

Moved element retrieval to the top and removed duplicate declarations.
---
 debugging/book-library/script.js | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 6d3cbdcc..cba44084 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,4 +1,9 @@
-let myLibrary = [];
+const titleEl = document.getElementById("title");
+const authorEl = document.getElementById("author");
+const pagesEl = document.getElementById("pages");
+const checkEl = document.getElementById("check");
+const submitBtnEl = document.getElementById("submit-btn");
+const myLibrary = [];
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
@@ -18,12 +23,6 @@ function populateStorage() {
   }
 }
 
-const titleEl = document.getElementById("title");
-const authorEl = document.getElementById("author");
-const pagesEl = document.getElementById("pages");
-const checkEl = document.getElementById("check");
-const submitBtnEl = document.getElementById("submit-btn");
-
 submitBtnEl.addEventListener("click", function (event) {
   event.preventDefault();
   submit();

From 79887c0e35af82c2eecce419be9024b477b46916 Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Tue, 21 Apr 2026 19:55:51 +0100
Subject: [PATCH 16/19] Remove IDs from buttons in book library

---
 debugging/book-library/script.js | 2 --
 1 file changed, 2 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index cba44084..fd6bf584 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -94,7 +94,6 @@ function render() {
 
     //add and wait for action for read/unread button
     const changeBut = document.createElement("button");
-    changeBut.id = i;
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     changeBut.innerText = myLibrary[i].check ? "Yes" : "No";
@@ -105,7 +104,6 @@ function render() {
 
     //add delete button to every row and render again
     const delBut = document.createElement("button");
-    delBut.id = i + 5;
     deleteCell.appendChild(delBut);
     delBut.className = "btn btn-warning";
     delBut.innerHTML = "Delete";

From a92aab76bbdedee5559b9c2ad0fc30cdda939df3 Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Tue, 21 Apr 2026 20:14:00 +0100
Subject: [PATCH 17/19] Refactor table row clearing in render function

Replaced old table deletion method with innerHTML clearing.
---
 debugging/book-library/script.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index fd6bf584..6de0a16b 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -75,10 +75,9 @@ function showMessage(text) {
 }
 function render() {
   const table = document.getElementById("display");
-  //delete old table
-  while (table.rows.length > 1) {
-    table.deleteRow(1);
-  }
+  const tableBody = document.querySelector("tbody");
+  tableBody.innerHTML = ""; // clears all rows
+}
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {

From 5cdb0e0136d21b0c5347125312b05adf2ad811d0 Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Tue, 21 Apr 2026 22:51:11 +0100
Subject: [PATCH 18/19] removed bracket

Added missing opening brace for the render function.
---
 debugging/book-library/script.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 6de0a16b..e6cead30 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -77,7 +77,7 @@ function render() {
   const table = document.getElementById("display");
   const tableBody = document.querySelector("tbody");
   tableBody.innerHTML = ""; // clears all rows
-}
+
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {

From 9ddeb45054e9055f538622bd25f6f7a6d1ac3100 Mon Sep 17 00:00:00 2001
From: marthak1 <60424466+marthak1@users.noreply.github.com>
Date: Tue, 21 Apr 2026 23:03:12 +0100
Subject: [PATCH 19/19] Fix row insertion to use tableBody instead of table

---
 debugging/book-library/script.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index e6cead30..e80d6926 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -81,7 +81,7 @@ function render() {
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
+    let row = tableBody.insertRow(1);
     let titleCell = row.insertCell(0);
     let authorCell = row.insertCell(1);
     let pagesCell = row.insertCell(2);