index.html

<!doctype html>
<html lang='en-US'>

<head>

<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1.0'>
<meta name='author' content='Amin NAIRI'>
<meta name='description' content='JavaScript test'>

<title>JavaScript test</title>

</head>

<body>

<h1>JavaScript test</h1>

<script>
    (function(){
        var full=true;
        full&&alert('Glass is full');
    })();
</script>

</body>

</html>