strfold/demo.html at master · Bangkokian/strfold · GitHub

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<html>
<title>strFold Demo</title>

<script type="text/javascript">


	// "folds" a string so that 12345 --> 15243  and  123456 --> 162534

	function strFold(given) {
		x=1;
		newstr = '';
		odd = false;
		if ((given.length%2) == 1) odd = true;

		while (x<Math.floor(given.length/2)+2) {
			newstr += given.substr(x-1,1);
			newstr += given.substr((x*-1)-0,1);
			x++;
		}
		if (odd) {
			newstr = newstr.substr(0,newstr.length-1);
		} else {
			newstr = newstr.substr(0,newstr.length-2);
		}
		return newstr;
	}


	//eg:


	console.log(strFold('0123456789'));
	console.log(strFold('1234567890'));
	console.log(strFold('123456789'));
	console.log(strFold('123'));
	console.log(strFold('1'));
	console.log(strFold(''));
	console.log(strFold('The quick brown fox jumped over the lazy dog.'));


</script>
<body>
	see browser console
</body>

</html>