diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 00000000..4e7c6cad
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,17 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${workspaceFolder}/array-destructuring/exercise-2/exercise.js"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/array-destructuring/exercise-1/exercise.js b/array-destructuring/exercise-1/exercise.js
index a6eab299..f838e89b 100644
--- a/array-destructuring/exercise-1/exercise.js
+++ b/array-destructuring/exercise-1/exercise.js
@@ -1,13 +1,14 @@
-const personOne = {
+let personOne = {
   name: "Popeye",
   age: 34,
-  favouriteFood: "Spinach",
+  favoriteFood: "Spinach",
 };
 
-function introduceYourself(___________________________) {
+let { name, age, favoriteFood } = personOne;
+
+function introduceYourself({ name, age, favoriteFood }) {
   console.log(
-    `Hello, my name is ${name}. I am ${age} years old and my favourite food is ${favouriteFood}.`
+    `Hello, my name is ${name}. I am ${age} years old and my favorite food is ${favoriteFood}.`
   );
 }
 
-introduceYourself(personOne);
diff --git a/array-destructuring/exercise-2/exercise.js b/array-destructuring/exercise-2/exercise.js
index e11b75eb..31c3cfd6 100644
--- a/array-destructuring/exercise-2/exercise.js
+++ b/array-destructuring/exercise-2/exercise.js
@@ -70,3 +70,22 @@ let hogwarts = [
     occupation: "Teacher",
   },
 ];
+
+let { firstName, lastName, house, pet} = hogwarts;
+
+function property(array){
+  let gryfindorHouse = array.filter(hogwarts => hogwarts.house === "Gryffindor")    //filter mean to give only the elements that pass a certain condition specified by a provided function
+  let getAllName = gryfindorHouse.map( hogwarts =>`${hogwarts.firstName}${hogwarts.lastName}`);
+  return getAllName;
+}
+console.log(property(hogwarts));
+
+function whoHavePet(array){
+  let findPet = array.filter(hogwarts => hogwarts.pet !== null)
+  let getPet = findPet.map( hogwarts =>`${hogwarts.firstName}${hogwarts.lastName}`);
+  return getPet;
+}
+
+console.log(whoHavePet(hogwarts));
+
+
diff --git a/array-destructuring/exercise-3/exercise.js b/array-destructuring/exercise-3/exercise.js
index 0a01f8f0..7e616f40 100644
--- a/array-destructuring/exercise-3/exercise.js
+++ b/array-destructuring/exercise-3/exercise.js
@@ -6,3 +6,26 @@ let order = [
   { itemName: "Hot Coffee", quantity: 2, unitPrice: 1.0 },
   { itemName: "Hash Brown", quantity: 4, unitPrice: 0.4 },
 ];
+
+let { quantity, itemName, unitPrice } = order;
+
+function itemList(item){
+  const subtitleItems = ["QTY", "ITEM", "TOTAL"];
+  item.forEach(order => {
+    const totalOrder = (order.quantity * order.unitPrice).toFixed(2);
+    subtitleItems.push(`${order.quantity}\t${order.itemName}\t${totalOrder}`);
+  });
+  
+  return subtitleItems.join('\n')
+  
+}
+console.log(itemList(order));
+
+
+function totalPrice(num) {
+  const total =  num.reduce((accumulator, currentValue) => accumulator + currentValue.unitPrice * currentValue.quantity, 0);
+  return `total: ${total}`
+
+}
+ console.log(totalPrice(order));
+
diff --git a/book-library/script.js b/book-library/script.js
index dc14a775..1eac06f7 100644
--- a/book-library/script.js
+++ b/book-library/script.js
@@ -28,19 +28,24 @@ 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() {
+  let titleValue = title.value;
+  let authorValue = author.value;
+  let pagesValue = pages.value;
+  let checkValue = check.checked;
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
+    titleValue == null ||
+    authorValue  == "" ||
+    pagesValue == null ||
+    checkValue == ""
   ) {
     alert("Please fill all fields!");
-    return false;
-  } else {
-    let book = new Book(title.value, title.value, pages.value, check.checked);
-    library.push(book);
-    render();
   }
+  
+  else {
+    let book = new Book(titleValue, authorValue, pagesValue, checkValue);
+      myLibrary.push(book);
+      render();
+} 
 }
 
 function Book(title, author, pages, check) {
@@ -49,39 +54,34 @@ function Book(title, author, pages, check) {
   this.pages = pages;
   this.check = check;
 }
-
 function render() {
   let table = document.getElementById("display");
   let rowsNumber = table.rows.length;
   //delete old table
-  for (let n = rowsNumber - 1; n > 0; n-- {
+  for (let n = rowsNumber - 1; n > 0; n--) {
     table.deleteRow(n);
   }
   //insert updated row and cells
   let length = myLibrary.length;
   for (let i = 0; i < length; i++) {
-    let row = table.insertRow(1);
-    let cell1 = row.insertCell(0);
-    let cell2 = row.insertCell(1);
-    let cell3 = row.insertCell(2);
-    let cell4 = row.insertCell(3);
-    let cell5 = row.insertCell(4);
+    const row = table.insertRow(1);
+    const cell1 = row.insertCell(0);
+    const cell2 = row.insertCell(1);
+    const cell3 = row.insertCell(2);
+    const cell4 = row.insertCell(3);
+    const cell5 = row.insertCell(4);
     cell1.innerHTML = myLibrary[i].title;
     cell2.innerHTML = myLibrary[i].author;
     cell3.innerHTML = 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";
     cell4.appendChild(changeBut);
-    let readStatus = "";
-    if (myLibrary[i].check == false) {
-      readStatus = "Yes";
-    } else {
-      readStatus = "No";
-    }
-    changeBut.innerHTML = readStatus;
+
+    const readStatus = myLibrary[i].check ? "Yes" : "No";
+    changeBut.textContent = readStatus;
 
     changeBut.addEventListener("click", function () {
       myLibrary[i].check = !myLibrary[i].check;
@@ -89,15 +89,17 @@ function render() {
     });
 
     //add delete button to every row and render again
-    let delButton = document.createElement("button");
-    delBut.id = i + 5;
+    const delBut = document.createElement("button");
+    delBut.id = i;
     cell5.appendChild(delBut);
     delBut.className = "btn btn-warning";
-    delBut.innerHTML = "Delete";
-    delBut.addEventListener("clicks", function () {
+    delBut.innerText = "Delete";
+    delBut.addEventListener("click", function () {
       alert(`You've deleted title: ${myLibrary[i].title}`);
       myLibrary.splice(i, 1);
       render();
     });
   }
-}
+};
+
+