Complete all tasks

01/app.js

@@ -0,0 +1,6 @@
+const showTime = function() {
+    const time = (new Date()).toLocaleTimeString();
+    console.log(time);
+ }
+
+ showTime();

02/app.js

@@ -0,0 +1,6 @@
+const sayHello = function(userName) {
+    console.log("Cześć", userName, "!");
+}
+
+sayHello('devmentor.pl');
+

03/app.js

@@ -0,0 +1,10 @@
+const sumNumbers = function(x) {
+    let result = 0;
+
+    for(let i = 0; i <= x; i++ ) {
+        result += i;
+    }
+
+    return result;
+}
+console.log(sumNumbers(4));

04/app.js

@@ -0,0 +1,15 @@
+let counter = 0;
+
+const runTimer = function() {
+    const time = (new Date()).toLocaleTimeString();
+    console.log(time);
+    counter++;
+    console.log(counter);
+
+    if(counter >= 5) {
+    clearInterval(intervalId);
+    console.log("Timer stop!");
+    }
+}
+
+const intervalId = setInterval(runTimer, 5000);