diff --git a/01/app.js b/01/app.js
index e69de29..a497bfc 100644
--- a/01/app.js
+++ b/01/app.js
@@ -0,0 +1,6 @@
+const users = ['Jan Kowalski', 'Monika Wysocka', 'Adam Nowak', 'Michał Ozimek', 'Dorota Rudzińska', 'Agata Borsuk'];
+
+console.log(users[0]);
+console.log(users[2]);
+console.log(users[4]);
+console.log('Liczba elementów tablicy:', users.length);
diff --git a/02/app.js b/02/app.js
index 9ad302b..268de64 100644
--- a/02/app.js
+++ b/02/app.js
@@ -1,6 +1,20 @@
 const randomArray = createRandomArray();
 console.log(randomArray);
 
+// wyświetlenie w konsoli wszystkich elementów tablicy przy pomocy pętli for
+
+for (let i = 0; i < randomArray.length; i++) {
+	console.log(randomArray[i]);
+}
+
+// wyświetlenie w konsoli wszystkich elementów tablicy przy pomocy metody tablicowej .forEach()
+
+randomArray.forEach(el => console.log(el));
+
+// wyświetl wartość ostatniego elementu tablicy
+console.log(randomArray[randomArray.length - 1]);
+
+
 
 
 // nie modyfikuj kodu poniżej!
@@ -9,15 +23,15 @@ console.log(randomArray);
 // ponieważ w JS występuje mechanizm tzw. hoisting-u
 
 function createRandomArray() {
-    const arr = [];
-    const len = getRandomInteger(1, 10)
-    for(let i=0; i<len; i++) {
-        arr.push( getRandomInteger(1, 100) );
-    }
+	const arr = [];
+	const len = getRandomInteger(1, 10);
+	for (let i = 0; i < len; i++) {
+		arr.push(getRandomInteger(1, 100));
+	}
 
-    return arr;
+	return arr;
 }
 
 function getRandomInteger(min, max) {
-    return Math.round(Math.random() * (max-min) + min);
-}
\ No newline at end of file
+	return Math.round(Math.random() * (max - min) + min);
+}
diff --git a/03/app.js b/03/app.js
index cebcbc2..1816772 100644
--- a/03/app.js
+++ b/03/app.js
@@ -1,2 +1,11 @@
 const n = 24;
-const oddNumbers = [];
\ No newline at end of file
+const oddNumbers = [];
+
+for (let i = 1; i <= n; i++) {
+	if (i % 2) {
+		oddNumbers.push(i);
+	}
+}
+
+console.log(oddNumbers);
+console.log('długość tablicy:', oddNumbers.length);
diff --git a/04/app.js b/04/app.js
index 8285afd..186344c 100644
--- a/04/app.js
+++ b/04/app.js
@@ -1 +1,7 @@
-const years = [1980, 1934, 2002, 2019];
\ No newline at end of file
+const years = [1980, 1934, 2002, 2019];
+
+const currYear = new Date().getFullYear();
+
+const newArr = years.map(year => currYear - year);
+
+console.log(newArr);
diff --git a/05/app.js b/05/app.js
index 1c6bb90..a666bb7 100644
--- a/05/app.js
+++ b/05/app.js
@@ -1 +1,5 @@
-const numbers = [1, 2, 3, 4, 5, 6, 7];
\ No newline at end of file
+const numbers = [1, 2, 3, 4, 5, 6, 7];
+
+const evenSum = numbers.filter(num => num % 2 === 0).reduce((acc, curr) => acc + curr, 0);
+
+console.log(evenSum);