diff --git a/01/app.js b/01/app.js
index e69de29..1fc15b8 100644
--- a/01/app.js
+++ b/01/app.js
@@ -0,0 +1,6 @@
+function showTime() {
+    const time = (new Date()).toLocaleTimeString();
+    console.log(time);
+}
+
+showTime();
\ No newline at end of file
diff --git a/02/app.js b/02/app.js
index e69de29..37221eb 100644
--- a/02/app.js
+++ b/02/app.js
@@ -0,0 +1,6 @@
+function sayHello(name){
+    console.log('Czesc ' + name + '!')
+}
+
+sayHello('Michal');
+sayHello('devmentor.pl');
\ No newline at end of file
diff --git a/03/app.js b/03/app.js
index e69de29..28e39da 100644
--- a/03/app.js
+++ b/03/app.js
@@ -0,0 +1,17 @@
+
+const fn = function (num) {
+    let result = 0;
+    for (let i = 1; i <= num; i++) {
+        result += i;
+        // console.log(i);
+    }
+    return result
+    // console.log(result);
+}
+
+const sumNumbers = fn(4);
+
+console.log(sumNumbers)
+
+console.log(fn(10), fn(20))
+
diff --git a/04/app.js b/04/app.js
index e69de29..0fc5bf3 100644
--- a/04/app.js
+++ b/04/app.js
@@ -0,0 +1,29 @@
+let idInterval;
+let counter = 1;
+
+function runTimer() {
+    const time = (new Date()).toLocaleTimeString();
+    console.log(time);
+    // timeCounter();
+    // counter++;
+    // console.log(counter);
+    // if (counter > 5) {
+    //     console.log('dziala');
+    //     clearInterval(idInterval);
+    // }
+}
+
+idInterval = setInterval(function(){
+    runTimer();
+    timeCounter();
+}, 1000);
+// runTimer();
+
+function timeCounter(){
+    counter++;
+    if(counter>5){
+        clearInterval(idInterval);
+    }
+}
+
+