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