<!DOCTYPE html>
<html lang="en-US">
<body>
<script>
document.write(Number.isFinite(25) +": 25 <br>");
document.write(Number.isFinite(0) +": 0<br>");
document.write(Number.isFinite(2e64) +": 2e64 <br>");
document.write(Number.isFinite(4 - 2) +": 4 - 2<br><br>");
document.write(Number.isFinite('65') +": '65'<br>");
document.write(Number.isFinite(55 / 0) +": 55 / 0<br>");
document.write(Number.isFinite(Infinity) +": Infinity<br>");
document.write(Number.isFinite(-Infinity) +": -Infinity<br>");
document.write(Number.isFinite(null) +": null<br>");
</script> </body>
</html>