Exercise:

Add an else statement to display "You're not John!".

if (condition) {
block of code to be executed if the condition is true
} else {
block of code to be executed if the condition is false
}

<!DOCTYPE html>
<html>
<body>

<p id="demo">Display the result here.</p>

<script>
var firstName = "Greg";

if (firstName === "John") {
    document.getElementById("demo").innerHTML = "Hello John!";
} else {
    document.getElementById("demo").innerHTML = "You're not John!";
}
</script>

</body>
</html>