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<!DOCTYPE html>
<html lang="ko">

<head>
	<meta charset="UTF-8">
	<title>JavaScript Number Object</title>
</head>

<body>

	<h1>null, undefined, NaN, Infinity</h1>

	<script>
		document.write((typeof null) + "<br>");
		document.write((typeof undefined) + "<br>");
		document.write((typeof NaN) + "<br>");
		document.write((typeof Infinity) + "<br><br>");

		document.write(Boolean(null) + "<br>");
		document.write(Boolean(undefined) + "<br>");
		document.write(Boolean(NaN) + "<br>");
		document.write(Boolean(Infinity) + "<br><br>");

		document.write(Number(null) + "<br>");
		document.write(Number(undefined) + "<br>");
		document.write(Number(NaN) + "<br>");
		document.write(Number(Infinity) + "<br><br>");

		document.write(String(null) + "<br>");
		document.write(String(undefined) + "<br>");
		document.write(String(NaN) + "<br>");
		document.write(String(Infinity));
	</script>
	
</body>

</html>