From eac59146196215c14d551cab4154e90e6d86d343 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 19:35:09 +0000
Subject: [PATCH 01/26] Fix syntax: missing closing brace

---
 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 75ce6c1d..eed706fd 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -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 d09f10db0d09a1f88646ea3319418e6bf1e3b283 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 19:38:50 +0000
Subject: [PATCH 02/26] Fix: Render all books on page load and when adding new
 books using form

---
 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 eed706fd..608a02ed 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -38,7 +38,7 @@ function submit() {
     return false;
   } else {
     let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
+    myLibrary.push(book);
     render();
   }
 }
@@ -89,12 +89,12 @@ 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 () {
+    let delBtn = document.createElement("button");
+    delBtn.id = i + 5;
+    deleteCell.appendChild(delBtn);
+    delBtn.className = "btn btn-warning";
+    delBtn.innerHTML = "Delete";
+    delBtn.addEventListener("clicks", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();

From e5c86062069913da231154946b6a688b80826dd7 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 19:48:17 +0000
Subject: [PATCH 03/26] change let to const on initial books to prevent
 accidental reassignment

---
 debugging/book-library/script.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 608a02ed..5188b0a4 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -7,13 +7,14 @@ 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",
       true
     );
+
     myLibrary.push(book1);
     myLibrary.push(book2);
     render();

From fcb63beaa21dffc865ef8d7044b7fe7c60c54082 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 19:52:36 +0000
Subject: [PATCH 04/26] renamed check to completed for clarity

---
 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 5188b0a4..12000d03 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -44,11 +44,11 @@ function submit() {
   }
 }
 
-function Book(title, author, pages, check) {
+function Book(title, author, pages, completed) {
   this.title = title;
   this.author = author;
   this.pages = pages;
-  this.check = check;
+  this.completed = completed;
 }
 
 function render() {

From d5aef674751c4fde4bb0884931d24d66f82a5be7 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 20:01:59 +0000
Subject: [PATCH 05/26] changed to match naming in the javascript, and for
 clarity.

---
 debugging/book-library/index.html | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 23acfa71..2bcf29ed 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html>
   <head>
     <title> </title>
@@ -59,13 +59,13 @@ <h1>Library</h1>
             class="form-check-input"
             id="check"
             value=""
-          />Read
+          />completed
         </label>
         <input
           type="submit"
           value="Submit"
           class="btn btn-primary"
-          onclick="submit();"
+          onclick="submit()"
         />
       </div>
     </div>
@@ -76,7 +76,7 @@ <h1>Library</h1>
           <th>Title</th>
           <th>Author</th>
           <th>Number of Pages</th>
-          <th>Read</th>
+          <th>Completed</th>
           <th></th>
         </tr>
       </thead>

From 7825b0002b9a2277d4b4a6550c69f51a5d929ee5 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 20:09:01 +0000
Subject: [PATCH 06/26] Fix: Display correct completed status and change button

---
 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 12000d03..47208dd1 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -77,7 +77,7 @@ function render() {
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
-    if (myLibrary[i].check == false) {
+    if (myLibrary[i].completed == true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
@@ -85,7 +85,7 @@ function render() {
     changeBut.innerText = readStatus;
 
     changeBut.addEventListener("click", function () {
-      myLibrary[i].check = !myLibrary[i].check;
+      myLibrary[i].completed = !myLibrary[i].completed;
       render();
     });
 

From 2ddbdb43b565bc6c1d96464286dcc8c7525347c3 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 21:08:16 +0000
Subject: [PATCH 07/26] fix delete button

---
 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 47208dd1..1a8bb209 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -95,7 +95,7 @@ function render() {
     deleteCell.appendChild(delBtn);
     delBtn.className = "btn btn-warning";
     delBtn.innerHTML = "Delete";
-    delBtn.addEventListener("clicks", function () {
+    delBtn.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();

From 4b9e8a130da65c242a6e95233538fbfe766026b5 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 21:12:38 +0000
Subject: [PATCH 08/26] remove unnecessary id on change button

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

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 1a8bb209..0754efcf 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -73,7 +73,6 @@ function render() {
 
     //add and wait for action for read/unread button
     let changeBut = document.createElement("button");
-    changeBut.id = i;
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     let readStatus = "";

From c933c4dae5ab4a10dbd1e25f4f2bc775e02ade15 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 21:57:15 +0000
Subject: [PATCH 09/26] remove unnecessary render in  load

---
 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 0754efcf..ac0a6e4e 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -2,7 +2,7 @@ let myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
-  render();
+  // render();
 });
 
 function populateStorage() {

From 9e475eca34c368bdace2e8b433957f1b38497084 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 21:58:23 +0000
Subject: [PATCH 10/26] remove unnecessary id in delete button

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

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index ac0a6e4e..adc944eb 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -90,7 +90,6 @@ function render() {
 
     //add delete button to every row and render again
     let delBtn = document.createElement("button");
-    delBtn.id = i + 5;
     deleteCell.appendChild(delBtn);
     delBtn.className = "btn btn-warning";
     delBtn.innerHTML = "Delete";

From 481c9d2cf40d27c2805207eac21b1b26ac01ddd6 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 22:08:49 +0000
Subject: [PATCH 11/26] reset input fields after adding new book

---
 debugging/book-library/script.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index adc944eb..8d682663 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -40,10 +40,18 @@ function submit() {
   } else {
     let book = new Book(title.value, title.value, pages.value, check.checked);
     myLibrary.push(book);
+    resetInputFields();
     render();
   }
 }
 
+function resetInputFields() {
+  title.value = "";
+  author.value = "";
+  pages.value = "";
+  check.checked = false;
+}
+
 function Book(title, author, pages, completed) {
   this.title = title;
   this.author = author;

From 92aa7dd8ee3f93369300f06234781d06da03df42 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 22:28:40 +0000
Subject: [PATCH 12/26] prevent duplicate book entries

Duplicate: title and author both the same as an existing book. Not case sensitive.
---
 debugging/book-library/script.js | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 8d682663..99c01938 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -37,12 +37,25 @@ function submit() {
   ) {
     alert("Please fill all fields!");
     return false;
-  } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    myLibrary.push(book);
-    resetInputFields();
-    render();
   }
+
+  let book = new Book(title.value, author.value, pages.value, check.checked);
+
+  if (isBookInLibrary(book)) {
+    alert("This book is already in the library!");
+    return false;
+  }
+  myLibrary.push(book);
+  resetInputFields();
+  render();
+}
+
+function isBookInLibrary(newBook) {
+  return myLibrary.some(
+    (old) =>
+      old.title.toLowerCase() === newBook.title.toLowerCase() &&
+      old.author.toLowerCase() === newBook.author.toLowerCase()
+  );
 }
 
 function resetInputFields() {

From 219e37e2a5442abf6614beff8ba10db4e3e488ae Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 6 Mar 2026 22:33:57 +0000
Subject: [PATCH 13/26] remove dead code

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

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 99c01938..71283f6b 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -2,7 +2,6 @@ let myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
-  // render();
 });
 
 function populateStorage() {

From e6f827fcc24c99b7948dc97f28c77cf52bbc7287 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 8 May 2026 15:08:06 +0100
Subject: [PATCH 14/26] rename completed btn for clarity

---
 debugging/book-library/script.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 71283f6b..bbea3b8c 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -92,18 +92,18 @@ function render() {
     pagesCell.innerHTML = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
-    let changeBut = document.createElement("button");
-    changeBut.className = "btn btn-success";
-    wasReadCell.appendChild(changeBut);
+    let changeCompletedBtn = document.createElement("button");
+    changeCompletedBtn.className = "btn btn-success";
+    wasReadCell.appendChild(changeCompletedBtn);
     let readStatus = "";
     if (myLibrary[i].completed == true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
     }
-    changeBut.innerText = readStatus;
+    changeCompletedBtn.innerText = readStatus;
 
-    changeBut.addEventListener("click", function () {
+    changeCompletedBtn.addEventListener("click", function () {
       myLibrary[i].completed = !myLibrary[i].completed;
       render();
     });

From c1db8fbec20afecc09e74af5962d41948385be51 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Fri, 8 May 2026 15:24:19 +0100
Subject: [PATCH 15/26] change color of completed btn to reflect status

---
 debugging/book-library/script.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index bbea3b8c..48b7fd78 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -93,13 +93,17 @@ function render() {
 
     //add and wait for action for read/unread button
     let changeCompletedBtn = document.createElement("button");
-    changeCompletedBtn.className = "btn btn-success";
+    changeCompletedBtn.className = "btn";
     wasReadCell.appendChild(changeCompletedBtn);
     let readStatus = "";
     if (myLibrary[i].completed == true) {
       readStatus = "Yes";
+      changeCompletedBtn.classList.add("btn-success");
+      changeCompletedBtn.classList.remove("btn-secondary");
     } else {
       readStatus = "No";
+      changeCompletedBtn.classList.remove("btn-success");
+      changeCompletedBtn.classList.add("btn-secondary");
     }
     changeCompletedBtn.innerText = readStatus;
 

From cb062e222a78735fc026807925fa43239d59dd23 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:24:38 +0100
Subject: [PATCH 16/26] fix input name, id and type values

---
 debugging/book-library/index.html | 17 ++++++-----------
 debugging/book-library/script.js  |  2 +-
 2 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 2bcf29ed..31ad7801 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -1,12 +1,7 @@
 <!doctype html>
-<html>
+<html lang="en">
   <head>
-    <title> </title>
-    <meta
-      charset="utf-8"
-      name="viewport"
-      content="width=device-width, initial-scale=1.0"
-    />
+    <title>Book library app</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>
@@ -29,12 +24,12 @@ <h1>Library</h1>
 
     <div id="demo" class="collapse">
       <div class="form-group">
-        <label for="title">Title:</label>
+        <label for="book-title">Title:</label>
         <input
-          type="title"
+          type="text"
           class="form-control"
-          id="title"
-          name="title"
+          id="book-title"
+          name="book-title"
           required
         />
         <label for="author">Author: </label>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 48b7fd78..b1ddcbd0 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -20,7 +20,7 @@ function populateStorage() {
   }
 }
 
-const title = document.getElementById("title");
+const title = document.getElementById("book-title");
 const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");

From d1a2249fc6961ef1e98d9a36d26336d0b7076599 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:25:25 +0100
Subject: [PATCH 17/26] fix author input type

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

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 31ad7801..ccb5298b 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -34,7 +34,7 @@ <h1>Library</h1>
         />
         <label for="author">Author: </label>
         <input
-          type="author"
+          type="text"
           class="form-control"
           id="author"
           name="author"

From 1e893fa283a86d60cd417fcd6e007ff11bcc7a05 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:34:31 +0100
Subject: [PATCH 18/26] add script as a module

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

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index ccb5298b..0a6f48b6 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -10,6 +10,7 @@
       href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
     />
     <link rel="stylesheet" type="text/css" href="style.css" />
+    <script type="module" src="script.js" defer></script>
   </head>
 
   <body>
@@ -60,7 +61,7 @@ <h1>Library</h1>
           type="submit"
           value="Submit"
           class="btn btn-primary"
-          onclick="submit()"
+          id="submit-btn"
         />
       </div>
     </div>
@@ -85,7 +86,5 @@ <h1>Library</h1>
         </tr>
       </tbody>
     </table>
-
-    <script src="script.js"></script>
   </body>
 </html>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index b1ddcbd0..22cee955 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -24,6 +24,7 @@ const title = document.getElementById("book-title");
 const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
+const submitBtn = document.getElementById("submit-btn");
 
 //check the right input from forms and if its ok -> add the new book (object in array)
 //via Book function and start render function
@@ -49,6 +50,8 @@ function submit() {
   render();
 }
 
+submitBtn.addEventListener("click", submit);
+
 function isBookInLibrary(newBook) {
   return myLibrary.some(
     (old) =>

From fc959f48bbcf91a19cf069d59be98d76b8123fff Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:37:23 +0100
Subject: [PATCH 19/26] input validation

---
 debugging/book-library/index.html | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 0a6f48b6..14b7fae0 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -10,7 +10,7 @@
       href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
     />
     <link rel="stylesheet" type="text/css" href="style.css" />
-    <script type="module" src="script.js" defer></script>
+    <script type="module" src="script.js"></script>
   </head>
 
   <body>
@@ -31,6 +31,8 @@ <h1>Library</h1>
           class="form-control"
           id="book-title"
           name="book-title"
+          minlength="1"
+          maxlength="200"
           required
         />
         <label for="author">Author: </label>
@@ -39,6 +41,8 @@ <h1>Library</h1>
           class="form-control"
           id="author"
           name="author"
+          minlength="2"
+          maxlength="100"
           required
         />
         <label for="pages">Pages:</label>
@@ -47,6 +51,8 @@ <h1>Library</h1>
           class="form-control"
           id="pages"
           name="pages"
+          min="1"
+          max="10000"
           required
         />
         <label class="form-check-label">

From 08d6c4cb395c423f78185c16994ad9e9c9b8482d Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:45:49 +0100
Subject: [PATCH 20/26] save page count as a number

---
 debugging/book-library/script.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 22cee955..fde5d68d 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -39,7 +39,13 @@ function submit() {
     return false;
   }
 
-  let book = new Book(title.value, author.value, pages.value, check.checked);
+  let book = new Book(
+    title.value,
+    author.value,
+    Number(pages.value),
+    check.checked
+  );
+  console.log(book);
 
   if (isBookInLibrary(book)) {
     alert("This book is already in the library!");

From 47c95a91020181a8500c3820502ada8945f7d3cf Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 10:49:40 +0100
Subject: [PATCH 21/26] remove null checks of input fields in submit

---
 debugging/book-library/script.js | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index fde5d68d..637999bd 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -20,30 +20,25 @@ function populateStorage() {
   }
 }
 
-const title = document.getElementById("book-title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
+const titleInput = document.getElementById("book-title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const isReadCheckbox = document.getElementById("check");
 const submitBtn = document.getElementById("submit-btn");
 
 //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 (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
-  ) {
+  if (titleInput.value == "" || pagesInput.value == "") {
     alert("Please fill all fields!");
     return false;
   }
 
   let book = new Book(
-    title.value,
-    author.value,
-    Number(pages.value),
-    check.checked
+    titleInput.value,
+    authorInput.value,
+    Number(pagesInput.value),
+    isReadCheckbox.checked
   );
   console.log(book);
 
@@ -67,10 +62,10 @@ function isBookInLibrary(newBook) {
 }
 
 function resetInputFields() {
-  title.value = "";
-  author.value = "";
-  pages.value = "";
-  check.checked = false;
+  titleInput.value = "";
+  authorInput.value = "";
+  pagesInput.value = "";
+  isReadCheckbox.checked = false;
 }
 
 function Book(title, author, pages, completed) {

From a9f157e1c284f25c26d474ccaf9532fc585f19fb Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 11:01:25 +0100
Subject: [PATCH 22/26] trim and validate input

---
 debugging/book-library/script.js | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 637999bd..9a0f3265 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -29,18 +29,19 @@ const submitBtn = document.getElementById("submit-btn");
 //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 (titleInput.value == "" || pagesInput.value == "") {
-    alert("Please fill all fields!");
+  const title = titleInput.value.trim();
+  const author = authorInput.value.trim();
+  const pages = Number(pagesInput.value);
+
+  if (title === "") {
+    alert("Please fill title field!");
     return false;
   }
 
-  let book = new Book(
-    titleInput.value,
-    authorInput.value,
-    Number(pagesInput.value),
-    isReadCheckbox.checked
-  );
-  console.log(book);
+  if (!Number.isInteger(pages) || pages < 1) {
+    alert("Pages must be a whole number greater than 0!");
+    return false;
+  }
 
   if (isBookInLibrary(book)) {
     alert("This book is already in the library!");

From fc74c9bdee80d5ffbf47ed32d45e4c6ed5dfb7fb Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 11:06:45 +0100
Subject: [PATCH 23/26] replace all innerHTML with textContent

innerHTML can be a security risk when dealing with user input
---
 debugging/book-library/script.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 9a0f3265..f445aab6 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -43,6 +43,8 @@ function submit() {
     return false;
   }
 
+  const book = new Book(title, author, pages, isReadCheckbox.checked);
+
   if (isBookInLibrary(book)) {
     alert("This book is already in the library!");
     return false;
@@ -92,9 +94,9 @@ 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 changeCompletedBtn = document.createElement("button");
@@ -110,7 +112,7 @@ function render() {
       changeCompletedBtn.classList.remove("btn-success");
       changeCompletedBtn.classList.add("btn-secondary");
     }
-    changeCompletedBtn.innerText = readStatus;
+    changeCompletedBtn.textContent = readStatus;
 
     changeCompletedBtn.addEventListener("click", function () {
       myLibrary[i].completed = !myLibrary[i].completed;
@@ -121,7 +123,7 @@ function render() {
     let delBtn = document.createElement("button");
     deleteCell.appendChild(delBtn);
     delBtn.className = "btn btn-warning";
-    delBtn.innerHTML = "Delete";
+    delBtn.textContent = "Delete";
     delBtn.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);

From 766487c728b0ddc7751b358a5923d44ad6d37ebf Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 11:24:16 +0100
Subject: [PATCH 24/26] fix render

simpler change button classlist logic
user confirm instead of alert in delete button
replace all unnecessary let to const
---
 debugging/book-library/script.js | 42 ++++++++++++++------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index f445aab6..d64d7bef 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,4 +1,4 @@
-let myLibrary = [];
+const myLibrary = [];
 
 window.addEventListener("load", function (e) {
   populateStorage();
@@ -79,40 +79,33 @@ function Book(title, author, pages, completed) {
 }
 
 function render() {
-  let table = document.getElementById("display");
-  let rowsNumber = table.rows.length;
+  const table = document.getElementById("display");
+  const rowsNumber = table.rows.length;
   //delete old table
   for (let n = rowsNumber - 1; n > 0; n--) {
     table.deleteRow(n);
   }
   //insert updated row and cells
-  let length = myLibrary.length;
+  const length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
-    let titleCell = row.insertCell(0);
-    let authorCell = row.insertCell(1);
-    let pagesCell = row.insertCell(2);
-    let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4);
+    const row = table.insertRow(1);
+    const titleCell = row.insertCell(0);
+    const authorCell = row.insertCell(1);
+    const pagesCell = row.insertCell(2);
+    const wasReadCell = row.insertCell(3);
+    const deleteCell = row.insertCell(4);
     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 changeCompletedBtn = document.createElement("button");
+    const changeCompletedBtn = document.createElement("button");
     changeCompletedBtn.className = "btn";
     wasReadCell.appendChild(changeCompletedBtn);
-    let readStatus = "";
-    if (myLibrary[i].completed == true) {
-      readStatus = "Yes";
-      changeCompletedBtn.classList.add("btn-success");
-      changeCompletedBtn.classList.remove("btn-secondary");
-    } else {
-      readStatus = "No";
-      changeCompletedBtn.classList.remove("btn-success");
-      changeCompletedBtn.classList.add("btn-secondary");
-    }
-    changeCompletedBtn.textContent = readStatus;
+    changeCompletedBtn.classList.add(
+      myLibrary[i].completed ? "btn-success" : "btn-secondary"
+    );
+    changeCompletedBtn.textContent = myLibrary[i].completed ? "Yes" : "No";
 
     changeCompletedBtn.addEventListener("click", function () {
       myLibrary[i].completed = !myLibrary[i].completed;
@@ -120,12 +113,13 @@ function render() {
     });
 
     //add delete button to every row and render again
-    let delBtn = document.createElement("button");
+    const delBtn = document.createElement("button");
     deleteCell.appendChild(delBtn);
     delBtn.className = "btn btn-warning";
     delBtn.textContent = "Delete";
     delBtn.addEventListener("click", function () {
-      alert(`You've deleted title: ${myLibrary[i].title}`);
+      const deletedBook = myLibrary[i].title;
+      if (!confirm(`Delete "${deletedBook}?`)) return;
       myLibrary.splice(i, 1);
       render();
     });

From 39a9048117edda25c3e0fa357e2bbc9817b18ce8 Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 11:33:43 +0100
Subject: [PATCH 25/26] fix meta tag

charset and the name attributes cannot be in the same meta tag
---
 debugging/book-library/index.html | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 14b7fae0..0c6c2091 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -9,6 +9,8 @@
       rel="stylesheet"
       href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
     />
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="stylesheet" type="text/css" href="style.css" />
     <script type="module" src="script.js"></script>
   </head>

From 0f5ee328a5484e086785c97076cbd46cb2786bee Mon Sep 17 00:00:00 2001
From: Raihan Sharif <raihansharif92@gmail.com>
Date: Thu, 14 May 2026 17:54:34 +0100
Subject: [PATCH 26/26] update min and max length to be more in line with
 VARCHAR used in databases

---
 debugging/book-library/index.html | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 0c6c2091..c69521a8 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -34,7 +34,7 @@ <h1>Library</h1>
           id="book-title"
           name="book-title"
           minlength="1"
-          maxlength="200"
+          maxlength="255"
           required
         />
         <label for="author">Author: </label>
@@ -43,8 +43,8 @@ <h1>Library</h1>
           class="form-control"
           id="author"
           name="author"
-          minlength="2"
-          maxlength="100"
+          minlength="1"
+          maxlength="255"
           required
         />
         <label for="pages">Pages:</label>