diff --git a/01/app.js b/01/app.js
index e69de29..b3f9413 100644
--- a/01/app.js
+++ b/01/app.js
@@ -0,0 +1,8 @@
+const users = ["Adam kowalski", "Jan Brzoza", "Sandra Malinowska", "Nikola Matlik", "Wiktoria Wiśniowska"];
+
+for(let i = 0; i < users.length; i++){
+    if(i % 2 === 0){
+        console.log(users[i])
+    }
+}
+console.log("tablica zawiera: " + users.length + " elementów");
\ No newline at end of file
diff --git a/02/app.js b/02/app.js
index 9ad302b..976f63b 100644
--- a/02/app.js
+++ b/02/app.js
@@ -20,4 +20,16 @@ function createRandomArray() {
 
 function getRandomInteger(min, max) {
     return Math.round(Math.random() * (max-min) + min);
-}
\ No newline at end of file
+}
+
+console.log("Wyświetlenie wszystkich elementów tablicy przy pomocy pętli for: ")
+
+for(let i = 0; i < randomArray.length; i++){
+    console.log(randomArray[i]);
+}
+
+console.log("Wyświetlenie wszystkich elementów tablicy przy pomocy metody foreach")
+
+randomArray.forEach(element => {
+    console.log(element)
+});
\ No newline at end of file
diff --git a/03/app.js b/03/app.js
index cebcbc2..a5d9ff3 100644
--- a/03/app.js
+++ b/03/app.js
@@ -1,2 +1,10 @@
-const n = 24;
-const oddNumbers = [];
\ No newline at end of file
+const n = 100;
+const oddNumbers = [];
+
+for(let i = 0; i <= n; i++){
+    if( i > 0 && i % 2 ===1){
+        oddNumbers.push(i);
+    }
+}
+
+console.log(oddNumbers);
\ No newline at end of file
diff --git a/04/app.js b/04/app.js
index 8285afd..899e7df 100644
--- a/04/app.js
+++ b/04/app.js
@@ -1 +1,11 @@
-const years = [1980, 1934, 2002, 2019];
\ No newline at end of file
+const years = [1980, 1934, 2002, 2019];
+
+const numbersOfYears = years.map(calcNumberOfYears);
+
+function calcNumberOfYears(element, index, array){
+    const currentYear = new Date().getFullYear();
+    return currentYear - element;
+}
+
+console.log(numbersOfYears)
+
diff --git a/05/app.js b/05/app.js
index 1c6bb90..4a9cd8b 100644
--- a/05/app.js
+++ b/05/app.js
@@ -1 +1,12 @@
-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 evenNumbers = numbers.filter((number) => {
+    if(number % 2 === 0){
+        return number;
+    }
+})
+
+const sum  = evenNumbers.reduce(function(prevValue, currentValue){
+    return prevValue + currentValue;
+});
+
+console.log(sum)
\ No newline at end of file