detects strings who's characters are in a Grey-code sequence

greystring.js

// detects strings whos bytes are greycoded
function greystring(str){
var a, b
	function bitcount(v){
	var c;
		for (c = 0; v; c++)
			v &= v - 1;
		return c;
	}
	for(var i = 1; i < str.length; i++)
	{
		a = str.charCodeAt(i - 1)
		b = str.charCodeAt(i)
		if(bitcount(a ^ b) > 1)
			return false
	}
	return true
}