<!DOCTYPE html>
<html lang="en-US">
<body>
<p>Check your console.</p>
<script>
console.log(Math.ceil(null)); // 0
console.log(Math.ceil(-4.2)); // -4
console.log(Math.ceil(-4.6)); // -4
console.log(Math.ceil(-4)); // -4
console.log(Math.ceil(4)); // 4
console.log(Math.ceil(4.2)); // 5
console.log(Math.ceil(4.6)); // 5
</script> </body>
</html>