OOP in JavaScript

[authera]

There's a "majakaj" line, and we need to replace a cyrillian with a Latin to finally get a "majak."

Code itself. "маяк". transliterate(); //должно вернуть "majak"

How to fulfil this function and what will be called transliterate()?

[simrah]

What am I saying?

In the end, my code was as follows:

var item = {city:['Vashington','Moskva','Erevan']};

var trans = function() {
    var
        rus = "щ   ш  ч  ц  ю  я  ё  ж  ъ  ы  э  а б в г д е з и й к л м н о п р с т у ф х ь".split(/ +/g),
        eng = "shh sh ch cz yu ya yo zh `` y' e` a b v g d e z i j k l m n o p r s t u f x `".split(/ +/g)
    ;
    return function(engToRus) {
        var x,
        text = this;
        for(x = 0; x < rus.length; x++) {
            text = text.split(engToRus ? rus[x] : eng[x]).join(engToRus ? eng[x] : rus[x]);
            text = text.split(engToRus ? rus[x].toUpperCase() : eng[x].toUpperCase()).join(engToRus ? eng[x].toUpperCase() : rus[x].toUpperCase());
        }
        return text;
    }
};
Object.prototype.transliterate = trans();
for(var i = 0; i < Object.keys(item.city).length; i++) {

console.log(item.city[i].transliterate());

}

P.S. Thanks for the answers.