diff --git a/src/lesson5/arrow-functions.js b/src/lesson5/arrow-functions.js
new file mode 100644
index 0000000..3a5ecf5
--- /dev/null
+++ b/src/lesson5/arrow-functions.js
@@ -0,0 +1,13 @@
+const sumArray = (arr) => arr.reduce((sum, current) => sum + Number(current), 0);
+
+const minusArray = (arr) => arr.reduce((sum, current) => sum - Number(current), 0);
+
+const numbersArray = [1, 2, 3, 4, 5];
+const stringsArray = ["10", "20", "30"];
+
+console.log("Sum of numbersArray:", sumArray(numbersArray));
+console.log("Sum of stringsArray:", sumArray(stringsArray));
+
+
+console.log("Minus of numbersArray:", minusArray(numbersArray));
+console.log("Minus of stringsArray:", minusArray(stringsArray));
diff --git a/src/lesson5/functions.js b/src/lesson5/functions.js
new file mode 100644
index 0000000..40ad325
--- /dev/null
+++ b/src/lesson5/functions.js
@@ -0,0 +1,16 @@
+function sumArray(arr) {
+    return arr.reduce((sum, current) => sum + Number(current), 0);
+}
+
+function minusArray(arr) {
+    return arr.reduce((sum, current) => sum - Number(current), 0);
+}
+
+const numbersArray = [1, 2, 3, 4, 5];
+const stringsArray = ["10", "20", "30"];
+
+console.log("Sum of numbersArray:", sumArray(numbersArray));
+console.log("Sum of stringsArray:", sumArray(stringsArray));
+
+console.log("Minus of numbersArray:", minusArray(numbersArray));
+console.log("Minus of stringsArray:", minusArray(stringsArray));
diff --git a/src/lesson5/getter-setters.js b/src/lesson5/getter-setters.js
new file mode 100644
index 0000000..687734d
--- /dev/null
+++ b/src/lesson5/getter-setters.js
@@ -0,0 +1,44 @@
+const person = {
+    _name: "John",
+    _age: 30,
+
+    get name() {
+        return this._name;
+    },
+
+    set name(newName) {
+        if (typeof newName === "string" && newName.length > 0) {
+            this._name = newName;
+        } else {
+            console.log("Invalid name");
+        }
+    },
+
+    get age() {
+        return this._age;
+    },
+
+    set age(newAge) {
+        if (Number.isInteger(newAge) && newAge > 0) {
+            this._age = newAge;
+        } else {
+            console.log("Invalid age");
+        }
+    },
+
+    increaseAge() {
+        this._age += 1;
+        return this._age;
+    }
+};
+
+console.log("Initial Name:", person.name);
+console.log("Initial Age:", person.age);
+
+person.name = "Alice";
+person.age = 35;
+
+console.log("Updated Name:", person.name);
+console.log("Updated Age:", person.age);
+
+console.log("Increased Age:", person.increaseAge());