12.4_map_keys().html

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>Example Map keys()</title>
</head>
<body>
	<script type="text/javascript">
		
		var m = new Map();

		m.set(1,"HTML");
		m.set(2,"CSS");
		m.set(3,"JavaScript");

		var iterator = m.keys();

		for(let i=0;i<m.size;i++){
			document.writeln(iterator.next().value + "<br>");
		}

	</script>
</body>
</html>