diff --git a/01/app.js b/01/app.js
index e69de29..63d6441 100644
--- a/01/app.js
+++ b/01/app.js
@@ -0,0 +1,7 @@
+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..594617f 100644
--- a/02/app.js
+++ b/02/app.js
@@ -0,0 +1,7 @@
+function sayHello() {
+    let name = (prompt('podaj imie'))
+
+    console.log ('Cześć', name + '!' )
+}
+
+sayHello(name)
\ No newline at end of file
diff --git a/03/app.js b/03/app.js
index e69de29..d8f21da 100644
--- a/03/app.js
+++ b/03/app.js
@@ -0,0 +1,12 @@
+const sumToNumber = function(x) {
+    let result = 0;
+    for(let i=1; i <= x; i++) {
+        result = result + i;
+       
+    }
+    return result
+
+}
+
+const res = sumToNumber(4)
+console.log(res)
\ No newline at end of file
diff --git a/04/app.js b/04/app.js
index e69de29..be483a8 100644
--- a/04/app.js
+++ b/04/app.js
@@ -0,0 +1,17 @@
+function runTimer() {
+    console.log('start');
+    let iteration = 0;
+    const idInterval = setInterval(function() {
+        const time = (new Date()).toLocaleTimeString();
+        console.log(time);
+        
+        iteration ++;
+        console.log (iteration);
+
+        if(iteration === 5) {
+            clearInterval(idInterval)
+        }
+    }, 1000)
+}
+
+runTimer()
\ No newline at end of file