tasks done

01/app.js

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

02/app.js

@@ -0,0 +1,6 @@
+function sayHello(name) {
+  alert(`Cześć, ${name}!`)
+};
+
+
+sayHello("devmentor.pl");

03/app.js

@@ -0,0 +1,11 @@
+sumNumbers = function (number) {
+  let sum = 0;
+
+  for (let i = 1; i <= number; i++) {
+    sum += i;
+  }
+
+  return sum
+};
+
+console.log(sumNumbers(4));

04/app.js

@@ -0,0 +1,10 @@
+let counter = 0;
+
+intervalId = setInterval(function () {
+  date = (new Date()).toLocaleTimeString();
+  console.log(date);
+  counter += 1;
+  if (counter >= 5) {
+    clearInterval(intervalId);
+  };
+}, 5000);