Manual lowercase / uppercase

manual.js

String.prototype.manualLowercase = function(s) {
	return (typeof s === 'string') ? s.replace(/[A-Z]/g, function (ch) {
		return String.fromCharCode(ch.charCodeAt(0) | 32)
	}) : s;
};

String.prototype.manualUppercase = function (s) {
	return (typeof s === 'string') ? s.replace(/[a-z]/g, function (ch) {
		return String.fromCharCode(ch.charCodeAt(0) & ~32)
	}) : s;
};