You can edit / change the code and click run button <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JavaScript String charCodeAt() Method</title> <script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101319977);</script><script async src="//static.getclicky.com/js"></script> JavaScript String charCodeAt() Method examples<br><br> <script type="text/javascript"> var str = new String( "Hello, World" ); document.writeln("str.charCodeAt(0) result :" + str.charAt(0)); document.writeln("<br />str.charCodeAt(1) result :" + str.charAt(3)); document.writeln("<br />str.charCodeAt(2) result :" + str.charAt(14)); document.writeln("<br />str.charCodeAt(3) result :" + str.charAt(2)); document.writeln("<br />str.charCodeAt(4) result :" + str.charAt(11)); document.writeln("<br />str.charCodeAt(5) result :" + str.charAt(9)); document.writeln("<br />str.charCodeAt(5) result :" + str.charAt(1)); </script>