Turkish Character Casing

TurkishCharCasing.js

String.prototype.turkishToUpper = function(){
	var string = this;
	var letters = { "i": "İ", "ş": "Ş", "ğ": "Ğ", "ü": "Ü", "ö": "Ö", "ç": "Ç", "ı": "I" };
	string = string.replace(/(([iışğüçö]))/g, function(letter){ return letters[letter]; })
	return string.toUpperCase();
}

String.prototype.turkishToLower = function(){
	var string = this;
	var letters = { "İ": "i", "I": "ı", "Ş": "ş", "Ğ": "ğ", "Ü": "ü", "Ö": "ö", "Ç": "ç" };
	string = string.replace(/(([İIŞĞÜÇÖ]))/g, function(letter){ return letters[letter]; })
	return string.toLowerCase();
}

String.prototype.turkishToCapital = function()
{
	var string = this;
	if(string != "undefined" && string.length > 1)
	{
		return string.substring(0, 1).turkishToUpper() + string.substring(1, string.length).turkishToLower();
	}
}