From dde250be588255dcadf91f0de88e52a591f06749 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 14:46:27 +0000
Subject: [PATCH 01/19] a full code analysis with some notes. fix the wrong
 typo of variable name (delBtutton) and close brackets for if statement

---
 debugging/book-library/script.js | 67 ++++++++++++++++++--------------
 1 file changed, 37 insertions(+), 30 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 75ce6c1d..deb4a0b8 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,12 +1,13 @@
 let myLibrary = [];
 
 window.addEventListener("load", function (e) {
-  populateStorage();
+  populateStorage(); // just if myLibrary is empty put two book on it with a specific details
   render();
 });
 
+//just one thing need to check 
 function populateStorage() {
-  if (myLibrary.length == 0) {
+  if (myLibrary.length == 0) {   //why there is just == not ===
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
     let book2 = new Book(
       "The Old Man and the Sea",
@@ -19,8 +20,8 @@ function populateStorage() {
     render();
   }
 }
-
-const title = document.getElementById("title");
+// clear associated with HTML
+const title = document.getElementById("title");   
 const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
@@ -28,22 +29,26 @@ const check = document.getElementById("check");
 //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 any of the information is missing show an alert
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
+    title.value == null ||    // == checks both null and undefined . === only null 
+    title.value == "" ||         // why you use the way and where author check??
+    pages.value == null ||     // if(!title.value||author.value|| page.value) is more clear and readable 
     pages.value == ""
-  ) {
-    alert("Please fill all fields!");
+  )
+   {
+    alert("Please fill all fields!");  // alert is a built-in JS function
     return false;
   } else {
     let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
-    render();
+    library.push(book);   // ???? the var called MyLibrary bro  
+    render();             // tell now where as submit event maybe later I will check
   }
 }
+ let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true); ///why i have this in populteStorage and here
 
-function Book(title, author, pages, check) {
+//function to create a new book as an object 
+ function Book(title, author, pages, check) {
   this.title = title;
   this.author = author;
   this.pages = pages;
@@ -54,50 +59,52 @@ function render() {
   let table = document.getElementById("display");
   let rowsNumber = table.rows.length;
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n-- {
-    table.deleteRow(n);
+  for (let n = rowsNumber - 1; n > 0; n--) {  //n>0 because we will delete all rows except the first one header
+    table.deleteRow(n);     //.deleteRow is a built-in JS function it remove the row by index 
   }
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
-    let titleCell = row.insertCell(0);
+    let row = table.insertRow(1);    // why (1) not i+1 insert <tr> with four <td>
+    let titleCell = row.insertCell(0);   // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
     let authorCell = row.insertCell(1);
-    let pagesCell = row.insertCell(2);
+    let pagesCell = row.insertCell(2);  
     let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4);
-    titleCell.innerHTML = myLibrary[i].title;
+    let deleteCell = row.insertCell(4);          // it is like insert for <td> </td> 
+    titleCell.innerHTML = myLibrary[i].title;    //filling the cells    why innerHTML
     authorCell.innerHTML = myLibrary[i].author;
     pagesCell.innerHTML = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
     let changeBut = document.createElement("button");
-    changeBut.id = i;
+    changeBut.id = i;                            // give the button the index of the book object
     changeBut.className = "btn btn-success";
-    wasReadCell.appendChild(changeBut);
+    wasReadCell.appendChild(changeBut);  
     let readStatus = "";
-    if (myLibrary[i].check == false) {
+    if (myLibrary[i].check == false) {  // why not ===
       readStatus = "Yes";
     } else {
       readStatus = "No";
     }
-    changeBut.innerText = readStatus;
+    changeBut.innerText = readStatus;  // fill the button with yes or no
 
     changeBut.addEventListener("click", function () {
-      myLibrary[i].check = !myLibrary[i].check;
+      myLibrary[i].check = !myLibrary[i].check;            //when we click will change yes to no and no to yes
       render();
     });
 
-    //add delete button to every row and render again
+    //add delete button to every row and render again 
+    //delButton
     let delButton = document.createElement("button");
-    delBut.id = i + 5;
-    deleteCell.appendChild(delBut);
-    delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delButton.id = i + 5;       // I think there is an issue here if we have more than five books
+    deleteCell.appendChild(delButton);
+    delButton.className = "btn btn-warning";
+    delButton.innerHTML = "Delete";
+    delButton.addEventListener("clicks", function () {    // 
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
+      //we do rendering after each change to UI
     });
   }
 }

From 4ec39f32fd3904b755fd71f82b4c7df88418d206 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 14:51:39 +0000
Subject: [PATCH 02/19]  website load bug has been solved

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

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index deb4a0b8..6812ba40 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -108,3 +108,4 @@ function render() {
     });
   }
 }
+

From 174123945cd99461253905b35fe4c4498b55d19d Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 14:55:52 +0000
Subject: [PATCH 03/19]  correct the var name

---
 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 6812ba40..798f8d35 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -41,7 +41,7 @@ function submit() {
     return false;
   } else {
     let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);   // ???? the var called MyLibrary bro  
+    myLibrary.push(book);   // ???? the var called MyLibrary bro  
     render();             // tell now where as submit event maybe later I will check
   }
 }

From 73d22f97ddb0f2d39f503edf29c7c6420956af21 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 14:59:40 +0000
Subject: [PATCH 04/19]  Console Error and author name have been solved

---
 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 798f8d35..9ddbf811 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -40,7 +40,7 @@ function submit() {
     alert("Please fill all fields!");  // alert is a built-in JS function
     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);   // ???? the var called MyLibrary bro  
     render();             // tell now where as submit event maybe later I will check
   }

From fa0089f546b4edb2a5f09ce8266f737533fd9b1d Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 15:01:59 +0000
Subject: [PATCH 05/19]  addEventListener bug has been solved

---
 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 9ddbf811..029a7655 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -100,7 +100,7 @@ function render() {
     deleteCell.appendChild(delButton);
     delButton.className = "btn btn-warning";
     delButton.innerHTML = "Delete";
-    delButton.addEventListener("clicks", function () {    // 
+    delButton.addEventListener("click", function () {    // 
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();

From 48c8f6ceb113bcd7d6d1ccd667a3fd959da85ab4 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 15:28:52 +0000
Subject: [PATCH 06/19]  all bugs to be fixed have been solved

---
 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 029a7655..2e412704 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -38,7 +38,7 @@ function submit() {
   )
    {
     alert("Please fill all fields!");  // alert is a built-in JS function
-    return false;
+    return false; 
   } else {
     let book = new Book(title.value, author.value, pages.value, check.checked);
     myLibrary.push(book);   // ???? the var called MyLibrary bro  
@@ -81,7 +81,7 @@ function render() {
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);  
     let readStatus = "";
-    if (myLibrary[i].check == false) {  // why not ===
+    if (myLibrary[i].check == true) {  // why not ===
       readStatus = "Yes";
     } else {
       readStatus = "No";

From 09081ddef151307ce7ebf431fe05a0e9d592b857 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 15:33:46 +0000
Subject: [PATCH 07/19] refactor and add author validtion

---
 debugging/book-library/script.js | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 2e412704..1b546cbd 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -30,12 +30,11 @@ const check = document.getElementById("check");
 //via Book function and start render function
 function submit() {
   //if any of the information is missing show an alert
-  if (
-    title.value == null ||    // == checks both null and undefined . === only null 
-    title.value == "" ||         // why you use the way and where author check??
-    pages.value == null ||     // if(!title.value||author.value|| page.value) is more clear and readable 
-    pages.value == ""
-  )
+  if (!title.value || !author.value ||!pages.value)
+      // == checks both null and undefined . === only null 
+            // why you use this way and where author check??
+         // if(!title.value||author.value|| page.value) is more clear and readable 
+  
    {
     alert("Please fill all fields!");  // alert is a built-in JS function
     return false; 

From febabaf9d0eeebc8a4b54482404eef04928eeefa Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Tue, 16 Dec 2025 15:50:17 +0000
Subject: [PATCH 08/19] clean the code

---
 debugging/book-library/script.js | 48 ++++++++++++++------------------
 1 file changed, 21 insertions(+), 27 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 1b546cbd..fca8ff15 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,13 +1,13 @@
 let myLibrary = [];
 
 window.addEventListener("load", function (e) {
-  populateStorage(); // just if myLibrary is empty put two book on it with a specific details
+  populateStorage();
   render();
 });
 
 //just one thing need to check 
 function populateStorage() {
-  if (myLibrary.length == 0) {   //why there is just == not ===
+  if (myLibrary.length === 0) {   //why there is just == not ===
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
     let book2 = new Book(
       "The Old Man and the Sea",
@@ -20,8 +20,8 @@ function populateStorage() {
     render();
   }
 }
-// clear associated with HTML
-const title = document.getElementById("title");   
+
+const title = document.getElementById("title");
 const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
@@ -30,24 +30,18 @@ const check = document.getElementById("check");
 //via Book function and start render function
 function submit() {
   //if any of the information is missing show an alert
-  if (!title.value || !author.value ||!pages.value)
-      // == checks both null and undefined . === only null 
-            // why you use this way and where author check??
-         // if(!title.value||author.value|| page.value) is more clear and readable 
-  
-   {
-    alert("Please fill all fields!");  // alert is a built-in JS function
-    return false; 
+  if (!title.value || !author.value || !pages.value) {
+    alert("Please fill all fields!");
+
+    return false;
   } else {
     let book = new Book(title.value, author.value, pages.value, check.checked);
-    myLibrary.push(book);   // ???? the var called MyLibrary bro  
-    render();             // tell now where as submit event maybe later I will check
+    myLibrary.push(book);
+    render();
   }
 }
- let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true); ///why i have this in populteStorage and here
 
-//function to create a new book as an object 
- function Book(title, author, pages, check) {
+function Book(title, author, pages, check) {
   this.title = title;
   this.author = author;
   this.pages = pages;
@@ -58,8 +52,8 @@ function render() {
   let table = document.getElementById("display");
   let rowsNumber = table.rows.length;
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n--) {  //n>0 because we will delete all rows except the first one header
-    table.deleteRow(n);     //.deleteRow is a built-in JS function it remove the row by index 
+  for (let n = rowsNumber - 1; n > 0; n--) {
+    table.deleteRow(n);
   }
   //insert updated row and cells
   let length = myLibrary.length;
@@ -67,7 +61,7 @@ function render() {
     let row = table.insertRow(1);    // why (1) not i+1 insert <tr> with four <td>
     let titleCell = row.insertCell(0);   // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
     let authorCell = row.insertCell(1);
-    let pagesCell = row.insertCell(2);  
+    let pagesCell = row.insertCell(2);
     let wasReadCell = row.insertCell(3);
     let deleteCell = row.insertCell(4);          // it is like insert for <td> </td> 
     titleCell.innerHTML = myLibrary[i].title;    //filling the cells    why innerHTML
@@ -78,24 +72,24 @@ function render() {
     let changeBut = document.createElement("button");
     changeBut.id = i;                            // give the button the index of the book object
     changeBut.className = "btn btn-success";
-    wasReadCell.appendChild(changeBut);  
+    wasReadCell.appendChild(changeBut);
     let readStatus = "";
-    if (myLibrary[i].check == true) {  // why not ===
+    if (myLibrary[i].check === true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
     }
-    changeBut.innerText = readStatus;  // fill the button with yes or no
+    changeBut.innerText = readStatus;
 
     changeBut.addEventListener("click", function () {
-      myLibrary[i].check = !myLibrary[i].check;            //when we click will change yes to no and no to yes
+      myLibrary[i].check = !myLibrary[i].check;
       render();
     });
 
     //add delete button to every row and render again 
-    //delButton
+
     let delButton = document.createElement("button");
-    delButton.id = i + 5;       // I think there is an issue here if we have more than five books
+    delButton.id = i + 5;
     deleteCell.appendChild(delButton);
     delButton.className = "btn btn-warning";
     delButton.innerHTML = "Delete";
@@ -103,7 +97,7 @@ function render() {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
-      //we do rendering after each change to UI
+
     });
   }
 }

From 8b9191784decac10df2ff014e9fcedb6d1b5c18e Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 20:29:24 +0000
Subject: [PATCH 09/19] fix the error in index file add type attribute (module)
 remove onclick and add id with event listener instead. Check validated

---
 debugging/book-library/index.html | 13 ++++++-------
 debugging/book-library/script.js  | 17 +++++++++++------
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 23acfa71..4fc91855 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -1,11 +1,10 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title> </title>
+    <title>Book Library </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>
@@ -31,7 +30,7 @@ <h1>Library</h1>
       <div class="form-group">
         <label for="title">Title:</label>
         <input
-          type="title"
+          type="text"
           class="form-control"
           id="title"
           name="title"
@@ -39,7 +38,7 @@ <h1>Library</h1>
         />
         <label for="author">Author: </label>
         <input
-          type="author"
+          type="text"
           class="form-control"
           id="author"
           name="author"
@@ -65,7 +64,7 @@ <h1>Library</h1>
           type="submit"
           value="Submit"
           class="btn btn-primary"
-          onclick="submit();"
+          id="submitBtn"
         />
       </div>
     </div>
@@ -91,6 +90,6 @@ <h1>Library</h1>
       </tbody>
     </table>
 
-    <script src="script.js"></script>
+    <script src="script.js" type="module"></script>
   </body>
 </html>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index fca8ff15..eb47bee5 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,5 +1,13 @@
 let myLibrary = [];
 
+const title = document.getElementById("title");
+const author = document.getElementById("author");
+const pages = document.getElementById("pages");
+const check = document.getElementById("check");
+
+const submitBtn = document.getElementById("submitBtn");
+submitBtn.addEventListener("click", submit);
+
 window.addEventListener("load", function (e) {
   populateStorage();
   render();
@@ -7,7 +15,7 @@ window.addEventListener("load", function (e) {
 
 //just one thing need to check 
 function populateStorage() {
-  if (myLibrary.length === 0) {   //why there is just == not ===
+  if (myLibrary.length === 0) {   
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", "252", true);
     let book2 = new Book(
       "The Old Man and the Sea",
@@ -17,19 +25,16 @@ function populateStorage() {
     );
     myLibrary.push(book1);
     myLibrary.push(book2);
-    render();
   }
 }
 
-const title = document.getElementById("title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
+
 
 //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 any of the information is missing show an alert
+
   if (!title.value || !author.value || !pages.value) {
     alert("Please fill all fields!");
 

From a2b51063ba9b09bdd89d9b9752ffc816b8d6200c Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 20:39:41 +0000
Subject: [PATCH 10/19]  fix page count type

---
 debugging/book-library/script.js | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index eb47bee5..7441b947 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -16,11 +16,11 @@ window.addEventListener("load", function (e) {
 //just one thing need to check 
 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);
@@ -28,8 +28,6 @@ function populateStorage() {
   }
 }
 
-
-
 //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() {
@@ -37,10 +35,9 @@ function submit() {
 
   if (!title.value || !author.value || !pages.value) {
     alert("Please fill all fields!");
-
-    return false;
+    return ;
   } else {
-    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);
     myLibrary.push(book);
     render();
   }

From cd54fe967b86cef13a5fd57a852d2c9c2d0d43f8 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 20:43:50 +0000
Subject: [PATCH 11/19]  improve code readability

---
 debugging/book-library/script.js | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 7441b947..54243dca 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -1,9 +1,9 @@
 let myLibrary = [];
 
-const title = document.getElementById("title");
-const author = document.getElementById("author");
-const pages = document.getElementById("pages");
-const check = document.getElementById("check");
+const titleInput = document.getElementById("title");
+const authorInput = document.getElementById("author");
+const pagesInput = document.getElementById("pages");
+const isReadInput = document.getElementById("check");
 
 const submitBtn = document.getElementById("submitBtn");
 submitBtn.addEventListener("click", submit);
@@ -33,11 +33,11 @@ function populateStorage() {
 function submit() {
   //if any of the information is missing show an alert
 
-  if (!title.value || !author.value || !pages.value) {
+  if (!titleInput.value || !authorInput.value || !pagesInput.value) {
     alert("Please fill all fields!");
     return ;
   } else {
-    let book = new Book(title.value, author.value,Number(pages.value), check.checked);
+    let book = new Book(titleInput.value, authorInput.value,Number(pagesInput.value), isReadInput.checked);
     myLibrary.push(book);
     render();
   }

From b241b9bacd5c5cabb60e04b46eb5b5da68c2e612 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 21:17:19 +0000
Subject: [PATCH 12/19] delete all rows in one operation

---
 debugging/book-library/index.html |  2 +-
 debugging/book-library/script.js  | 43 +++++++++++++++++--------------
 2 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/debugging/book-library/index.html b/debugging/book-library/index.html
index 4fc91855..0d05f114 100644
--- a/debugging/book-library/index.html
+++ b/debugging/book-library/index.html
@@ -79,7 +79,7 @@ <h1>Library</h1>
           <th></th>
         </tr>
       </thead>
-      <tbody>
+      <tbody id="tbody">
         <tr>
           <td></td>
           <td></td>
diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 54243dca..e5c8dd55 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -13,9 +13,9 @@ window.addEventListener("load", function (e) {
   render();
 });
 
-//just one thing need to check 
+//just one thing need to check
 function populateStorage() {
-  if (myLibrary.length === 0) {   
+  if (myLibrary.length === 0) {
     let book1 = new Book("Robison Crusoe", "Daniel Defoe", 252, true);
     let book2 = new Book(
       "The Old Man and the Sea",
@@ -32,12 +32,19 @@ function populateStorage() {
 //via Book function and start render function
 function submit() {
   //if any of the information is missing show an alert
-
-  if (!titleInput.value || !authorInput.value || !pagesInput.value) {
+  const titleValue = titleInput.value.trim();
+  const authorValue = authorInput.value.trim();
+  const pagesValue = Number(pagesInput.value);
+  if (!titleValue || !authorValue || !pagesValue || pagesValue < 0) {
     alert("Please fill all fields!");
-    return ;
+    return;
   } else {
-    let book = new Book(titleInput.value, authorInput.value,Number(pagesInput.value), isReadInput.checked);
+    let book = new Book(
+      titleValue,
+      authorValue,
+      pagesValue,
+      isReadInput.checked
+    );
     myLibrary.push(book);
     render();
   }
@@ -52,27 +59,24 @@ function Book(title, author, pages, check) {
 
 function render() {
   let table = document.getElementById("display");
-  let rowsNumber = table.rows.length;
-  //delete old table
-  for (let n = rowsNumber - 1; n > 0; n--) {
-    table.deleteRow(n);
-  }
+  const tableBody = document.getElementById("tbody");
+  tableBody.textContent = "";
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);    // why (1) not i+1 insert <tr> with four <td>
-    let titleCell = row.insertCell(0);   // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
+    let row = tableBody.insertRow(); // why (1) not i+1 insert <tr> with four <td>
+    let titleCell = row.insertCell(0); // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
     let authorCell = row.insertCell(1);
     let pagesCell = row.insertCell(2);
     let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4);          // it is like insert for <td> </td> 
-    titleCell.innerHTML = myLibrary[i].title;    //filling the cells    why innerHTML
+    let deleteCell = row.insertCell(4); // it is like insert for <td> </td>
+    titleCell.innerHTML = myLibrary[i].title; //filling the cells    why innerHTML
     authorCell.innerHTML = myLibrary[i].author;
     pagesCell.innerHTML = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
     let changeBut = document.createElement("button");
-    changeBut.id = i;                            // give the button the index of the book object
+    changeBut.id = i; // give the button the index of the book object
     changeBut.className = "btn btn-success";
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
@@ -88,19 +92,18 @@ function render() {
       render();
     });
 
-    //add delete button to every row and render again 
+    //add delete button to every row and render again
 
     let delButton = document.createElement("button");
     delButton.id = i + 5;
     deleteCell.appendChild(delButton);
     delButton.className = "btn btn-warning";
     delButton.innerHTML = "Delete";
-    delButton.addEventListener("click", function () {    // 
+    delButton.addEventListener("click", function () {
+      //
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
-
     });
   }
 }
-

From 62d1b204d0ee9f9d007165dc13cc3956a547e329 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 21:32:14 +0000
Subject: [PATCH 13/19] use textContent . change alert place to after delete
 process

---
 debugging/book-library/script.js | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index e5c8dd55..0b750c7f 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -70,39 +70,38 @@ function render() {
     let pagesCell = row.insertCell(2);
     let wasReadCell = row.insertCell(3);
     let deleteCell = row.insertCell(4); // it is like insert for <td> </td>
-    titleCell.innerHTML = myLibrary[i].title; //filling the cells    why innerHTML
-    authorCell.innerHTML = myLibrary[i].author;
-    pagesCell.innerHTML = myLibrary[i].pages;
+    titleCell.textContent = myLibrary[i].title; //filling the cells    why innerHTML
+    authorCell.textContent = myLibrary[i].author;
+    pagesCell.textContent = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
-    let changeBut = document.createElement("button");
-    changeBut.id = i; // give the button the index of the book object
-    changeBut.className = "btn btn-success";
-    wasReadCell.appendChild(changeBut);
+    let changeReadBut = document.createElement("button");
+    changeReadBut.className = "btn btn-success";
+    wasReadCell.appendChild(changeReadBut);
     let readStatus = "";
     if (myLibrary[i].check === true) {
       readStatus = "Yes";
     } else {
       readStatus = "No";
     }
-    changeBut.innerText = readStatus;
+    changeReadBut.textContent = readStatus;
 
-    changeBut.addEventListener("click", function () {
+    changeReadBut.addEventListener("click", function () {
       myLibrary[i].check = !myLibrary[i].check;
       render();
     });
 
     //add delete button to every row and render again
 
-    let delButton = document.createElement("button");
-    delButton.id = i + 5;
-    deleteCell.appendChild(delButton);
-    delButton.className = "btn btn-warning";
-    delButton.innerHTML = "Delete";
-    delButton.addEventListener("click", function () {
+    let deleteBut = document.createElement("button");
+    deleteCell.appendChild(deleteBut);
+    deleteBut.className = "btn btn-warning";
+    deleteBut.textContent = "Delete";
+    deleteBut.addEventListener("click", function () {
       //
-      alert(`You've deleted title: ${myLibrary[i].title}`);
+      
       myLibrary.splice(i, 1);
+      alert(`You've deleted title: ${myLibrary[i].title}`);
       render();
     });
   }

From d34f4fdd0c2b8653e71dce0e8d5c0ec28b73a131 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Wed, 17 Dec 2025 21:41:43 +0000
Subject: [PATCH 14/19]  add deletedtitle variable to store the title

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

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index 0b750c7f..bcc93f83 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -98,10 +98,9 @@ function render() {
     deleteBut.className = "btn btn-warning";
     deleteBut.textContent = "Delete";
     deleteBut.addEventListener("click", function () {
-      //
-      
+      const DeletedTitle = myLibrary[i].title;
       myLibrary.splice(i, 1);
-      alert(`You've deleted title: ${myLibrary[i].title}`);
+      alert(`You've deleted title: ${DeletedTitle}`);
       render();
     });
   }

From eb7a6bda4f4566f88c920d86cf14b9a8e49323fb Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Thu, 18 Dec 2025 13:28:54 +0000
Subject: [PATCH 15/19] add validtion for pagesvalue

---
 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 bcc93f83..b86d8e7b 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -35,7 +35,7 @@ function submit() {
   const titleValue = titleInput.value.trim();
   const authorValue = authorInput.value.trim();
   const pagesValue = Number(pagesInput.value);
-  if (!titleValue || !authorValue || !pagesValue || pagesValue < 0) {
+  if (!titleValue || !authorValue || Number.isFinite(!pagesValue) || pagesValue <= 0) {
     alert("Please fill all fields!");
     return;
   } else {

From 9c648ef07891d464faf2fced1af834b24ca6a9a5 Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Thu, 18 Dec 2025 13:33:47 +0000
Subject: [PATCH 16/19] use short hand if

---
 debugging/book-library/script.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index b86d8e7b..c2d53481 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -84,6 +84,8 @@ function render() {
     } else {
       readStatus = "No";
     }
+    readStatus= myLibrary[i].check===true? "yes":"no";
+    
     changeReadBut.textContent = readStatus;
 
     changeReadBut.addEventListener("click", function () {
@@ -98,9 +100,9 @@ function render() {
     deleteBut.className = "btn btn-warning";
     deleteBut.textContent = "Delete";
     deleteBut.addEventListener("click", function () {
-      const DeletedTitle = myLibrary[i].title;
+      const deletedTitle = myLibrary[i].title;
       myLibrary.splice(i, 1);
-      alert(`You've deleted title: ${DeletedTitle}`);
+      alert(`You've deleted title: ${deletedTitle}`);
       render();
     });
   }

From b6adcd2c1130ba7617b323489ce0bc0dde6a718d Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Thu, 18 Dec 2025 13:37:42 +0000
Subject: [PATCH 17/19]  use const

---
 debugging/book-library/script.js | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index c2d53481..b0b8a749 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -64,12 +64,12 @@ function render() {
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = tableBody.insertRow(); // why (1) not i+1 insert <tr> with four <td>
-    let titleCell = row.insertCell(0); // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
-    let authorCell = row.insertCell(1);
-    let pagesCell = row.insertCell(2);
-    let wasReadCell = row.insertCell(3);
-    let deleteCell = row.insertCell(4); // it is like insert for <td> </td>
+    const row = tableBody.insertRow(); // why (1) not i+1 insert <tr> with four <td>
+    const titleCell = row.insertCell(0); // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
+    const authorCell = row.insertCell(1);
+    const pagesCell = row.insertCell(2);
+    const wasReadCell = row.insertCell(3);
+    const deleteCell = row.insertCell(4); // it is like insert for <td> </td>
     titleCell.textContent = myLibrary[i].title; //filling the cells    why innerHTML
     authorCell.textContent = myLibrary[i].author;
     pagesCell.textContent = myLibrary[i].pages;

From 02a6b5fe547163bb2d2a6443e1dbdb0b8eedbc8d Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Thu, 18 Dec 2025 14:03:12 +0000
Subject: [PATCH 18/19]  check all variable fix validtion clean the code

---
 debugging/book-library/script.js | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/debugging/book-library/script.js b/debugging/book-library/script.js
index b0b8a749..82c0fb3d 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -16,8 +16,8 @@ window.addEventListener("load", function (e) {
 //just one thing need to check
 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,
@@ -35,11 +35,11 @@ function submit() {
   const titleValue = titleInput.value.trim();
   const authorValue = authorInput.value.trim();
   const pagesValue = Number(pagesInput.value);
-  if (!titleValue || !authorValue || Number.isFinite(!pagesValue) || pagesValue <= 0) {
+  if (!titleValue || !authorValue || !Number.isFinite(pagesValue) || pagesValue <= 0) {
     alert("Please fill all fields!");
     return;
   } else {
-    let book = new Book(
+    const book = new Book(
       titleValue,
       authorValue,
       pagesValue,
@@ -58,11 +58,10 @@ function Book(title, author, pages, check) {
 }
 
 function render() {
-  let table = document.getElementById("display");
   const tableBody = document.getElementById("tbody");
   tableBody.textContent = "";
   //insert updated row and cells
-  let length = myLibrary.length;
+  const length = myLibrary.length;
   for (let i = 0; i < length; i++) {
     const row = tableBody.insertRow(); // why (1) not i+1 insert <tr> with four <td>
     const titleCell = row.insertCell(0); // the table.rows and row.cells are HTMLCollection,not a real array, but they behave like array(indexed,length) . they are DOM collections
@@ -75,15 +74,10 @@ function render() {
     pagesCell.textContent = myLibrary[i].pages;
 
     //add and wait for action for read/unread button
-    let changeReadBut = document.createElement("button");
+    const changeReadBut = document.createElement("button");
     changeReadBut.className = "btn btn-success";
     wasReadCell.appendChild(changeReadBut);
     let readStatus = "";
-    if (myLibrary[i].check === true) {
-      readStatus = "Yes";
-    } else {
-      readStatus = "No";
-    }
     readStatus= myLibrary[i].check===true? "yes":"no";
     
     changeReadBut.textContent = readStatus;

From 49305b043d95904fe48969b40cfce600eb071e4d Mon Sep 17 00:00:00 2001
From: Ahmad Hmedan <ahmadhmedann@gmail.com>
Date: Thu, 18 Dec 2025 14:07:15 +0000
Subject: [PATCH 19/19] fix validtion

---
 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 82c0fb3d..bebd92f5 100644
--- a/debugging/book-library/script.js
+++ b/debugging/book-library/script.js
@@ -35,7 +35,7 @@ function submit() {
   const titleValue = titleInput.value.trim();
   const authorValue = authorInput.value.trim();
   const pagesValue = Number(pagesInput.value);
-  if (!titleValue || !authorValue || !Number.isFinite(pagesValue) || pagesValue <= 0) {
+  if (!titleValue || !authorValue || !Number.isInteger(pagesValue) || pagesValue <= 0) {
     alert("Please fill all fields!");
     return;
   } else {
@@ -89,7 +89,7 @@ function render() {
 
     //add delete button to every row and render again
 
-    let deleteBut = document.createElement("button");
+    const deleteBut = document.createElement("button");
     deleteCell.appendChild(deleteBut);
     deleteBut.className = "btn btn-warning";
     deleteBut.textContent = "Delete";