<!doctype html>
<html>

<head lang="en">
  <title>Function part 2</title>
  <meta charset="utf-8">
</head>

<body>

</body>

</html>
var sum = function (a, b) {
  return a + b;
};

var displayInPage = function (message, value) {
  // this function does not return anything
  document.body.innerHTML += message + value + "<br>";
};

var result = sum(3, 4);
displayInPage("Result: ", result);

// we could have written this
displayInPage("Result: ", sum(10, 15));

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