spideron

String.prototype.wiFormat = function () {
    var pattern = /\{\d+\}/g;
    var args = arguments;
    return this.replace(pattern, function (capture) {
        return args[capture.match(/\d+/)];
    });
};

spideron

String.prototype.shuffle = function(size){
    var arr = this.split('');
    for(var j, x, i = arr.length; i; j = parseInt(Math.random() * i), x = arr[--i], arr[i] = arr[j], arr[j] = x){};
    arr = arr.join('');
    return size ? arr.substr(0, Math.min(size, arr.length-1)) : arr;
};