Simple scramble char effect jQuery plugin

danScramble.js

(function($) {
    $.fn.danScramble = function(options) {
        var $this = $(this);
        var opts = $.extend({}, $.fn.danScramble.defaults, options);
        var letters = opts.letters.split('');
        var maxTries = opts.maxTotalTries;
        var randomMax = opts.randomMax;
        var length = letters.length;
        var string = $this.text();
        var array = string.split('');
        var origArray = string.split('');
        var arrayMaxTries = [];
        var arrayTries = [];
        var tries = 0;
        array.forEach(function(char, i) {
            arrayTries[i] = 0;
            arrayMaxTries[i] = Math.floor(Math.random() * (randomMax + 1));
        });
        var interval = setInterval(function(){
            var alldone = true;
            array.forEach(function(char, i) {
                if (arrayTries[i] < arrayMaxTries[i]) {
                    var random = Math.floor(Math.random() * (length + 1));
                    array[i] = letters[random];
                    arrayTries[i] = tries;
                    alldone = false;
                }
                else {
                    array[i] = origArray[i];
                }
            });
                $this.text(array.join(''));
                if (tries > maxTries || alldone) {
                    clearInterval(interval);
                    $this.text(string);
                }
                    tries++;
        },100);

        return this;
    };
    $.fn.danScramble.defaults = {
        maxTotalTries: 50,
        randomMax: 20,
        letters: 'QWERTYUIOPASDFGHJKLZXCVNM1234567890!@#$%&*'
    };
}(jQuery));