ITP JAN 25 | Katarzyna Kazimierczuk | Data Flows | Debugging

debugging/book-library/index.html

@@ -82,11 +82,11 @@ <h1>Library</h1>
       </thead>
       <tbody>
         <tr>
+          <!-- <td></td>
           <td></td>
           <td></td>
           <td></td>
-          <td></td>
-          <td></td>
+          <td></td> -->
         </tr>
       </tbody>
     </table>

debugging/book-library/readme.md

@@ -13,11 +13,15 @@ My website should be able to:
 ## Bugs to be fixed
 
 1. Website loads but doesn't show any books
+line 57 synthax error in render
 2. Error in console when you try to add a book
+line 41 the original code tried pushing to a wrong array name
 3. It uses the title name as the author name
+in line 40 title.value was repeated
 4. Delete button is broken
+line 92 inconsistent name deleteBut
+line 97 typo
 5. When I add a book that I say I've read - it saves the wrong answer
+line 80 no should be first
 
-I think there are other some other small bugs in my code...but I'm lazy so I can't fix them all.
 
-I wish somebody would help me!

debugging/book-library/script.js

@@ -37,8 +37,8 @@ function submit() {
     alert("Please fill all fields!");
     return false;
   } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
+    let book = new Book(title.value, author.value, pages.value, check.checked);
+    myLibrary.push(book);
     render();
   }
 }
@@ -54,8 +54,8 @@ 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--) {
+      table.deleteRow(n);
   }
   //insert updated row and cells
   let length = myLibrary.length;
@@ -77,9 +77,9 @@ function render() {
     wasReadCell.appendChild(changeBut);
     let readStatus = "";
     if (myLibrary[i].check == false) {
-      readStatus = "Yes";
-    } else {
       readStatus = "No";
+    } else {
+      readStatus = "Yes";
     }
     changeBut.innerText = readStatus;
 
@@ -89,12 +89,12 @@ function render() {
     });
 
     //add delete button to every row and render again
-    let delButton = document.createElement("button");
+    let delBut = document.createElement("button");
     delBut.id = i + 5;
     deleteCell.appendChild(delBut);
     delBut.className = "btn btn-warning";
     delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delBut.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();

debugging/code-reading/readme.md

@@ -16,7 +16,7 @@ Take a look at the following code:
 ```
 
 Explain why line 5 and line 8 output different numbers.
-
+It happens because of the local and global scope being different, line 5 is 2 and line 8 is 1.
 ## Question 2
 
 Take a look at the following code:
@@ -34,6 +34,7 @@ console.log(y);
 ```
 
 What will be the output of this code. Explain your answer in 50 words or less.
+f1 does not return anything, so console.log is undefined, line 33 will be an error because of the local scope of y.
 
 ## Question 3
 
@@ -62,3 +63,8 @@ console.log(y);
 ```
 
 What will be the output of this code. Explain your answer in 50 words or less.
+f1(x) does not print, 9 because of the x being passeed by value
+console.log(y) prints { x: 10 } because object is referenced and changed
+
+f1(x) doesn’t print, so console.log(x) will still prints 9
+Because objects are passed by reference, f2(y) changes the property and line 62 will print {x:10}.