String.format = function (formatString) {
    if (!formatString)
        return '';

    var args = Array.prototype.slice.call(arguments, 1);
    return formatString.replace(/{(\d+)}/g, function (match, index) {
        return args[index] ? args[index] : match;
    });
};

console.format = function() {
    console.log(String.format.apply(this, arguments));
}