<!DOCTYPE html>
<html lang="en-US">
<body>
<script>
document.write(Number.isInteger(0) +": 0 <br>");
document.write(Number.isInteger(1) +": 1 <br>");
document.write(Number.isInteger(-25) +": -25 <br>");
document.write(Number.isInteger(99999999999) +": 99999999999 <br><br>");
document.write(Number.isInteger(true) +": true <br>");
document.write(Number.isInteger(false) +": false <br>");
document.write(Number.isInteger('65') +": '65' <br>");
document.write(Number.isInteger(1.5) +": 1.5 <br>");
document.write(Number.isInteger([5]) +": [5] <br>");
document.write(Number.isInteger(NaN) +": NaN <br>");
document.write(Number.isInteger(Infinity) +": Infinity <br>");
document.write(Number.isInteger(-Infinity) +": -Infinity <br>");
document.write(Number.isInteger(null) +": null <br>");
</script> </body>
</html>