Javascript URL shortener

<!-- // Pure JS URL shortener, see http://www.lanoiadimuu.it/2014/12/the-cheapest-js-url-shortener-ever/
// Function declaration
function shorturl_redirect() {
    // This JSON array contains all the shorturl/url pairs
    var urls =[ { "shorturl":"?lndm" , "redirect":"http://www.lanoiadimuu.it" },
            { "shorturl":"?example" , "redirect":"http://www.example.com" },
            { "shorturl":"?twitter" , "redirect":"http://twitter.com/lanoiadimuu" },
    // Get the url parameter
    var shorturl = location.search;
    // If there's no url parameter stop script execution
    if(!shorturl || 0 === shorturl.length) { return; }
    // Now the function will look though urls array and if a valid shorturl is found it will redirect the browser to the longer url
    for(i = 0; i < urls.length; i++) {
        if(shorturl == urls[i].shorturl) {
            window.location.replace(urls[i].redirect)
            break;
        }
     }
}
// Function call
shorturl_redirect();
// -->