Edit in JSFiddle

function fetchYahooPriceOnMOEX(ticker) {
   if (ticker && ticker.map) {            
     return ticker.map(fetchYahooPriceOnMOEX);
  } else {
    return UrlFetchApp.fetch("http://finance.yahoo.com/d/quotes.csv?s=" + ticker + ".ME&f=g").getContentText().replace(".", ",").trim();
  }
}