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//not sure if this works as it should
//diff
function arr_diff(a1, a2) {
    var a = [],
        diff = [];
    for (var i = 0; i < a1.length; i++)
        a[a1[i]] = true;
    for (var i = 0; i < a2.length; i++)
        if (a[a2[i]]) delete a[a2[i]];
        else a[a2[i]] = true;
    for (var k in a)
        diff.push(k);
    return diff;
}

/* Node.js App */

var walk = require('walk'),
    fs = require('fs'),
    options, walker,
    doneArray = []; //just the numbers of the files

options = {
    followLinks: false
    // directories with these keys will be skipped
};

//folder to walk
walker = walk.walk("export/costco-album", options);

walker.on("names", function(root, nodeNamesArray) {

    nodeNamesArray.sort(function(a, b) {
        if (a > b) return 1;
        if (a < b) return -1;
        return 0;
    });
    var removeDS = nodeNamesArray.splice(1);

    removeDS.forEach(function(item) {
        doneArray.push(parseInt(item.split('.')[0]));
    });
    console.log(doneArray);
});

walker.on("errors", function(root, nodeStatsArray, next) {
    next();
});

walker.on("end", function() {
    console.log("all done");
});

/* Page code to get all file names that are uploaded then sort them */

var a = jQuery('li.item'),
	sorted = [];

for (var i = 0, len = a.length; i < len; i++) {
	var title = jQuery(a[i]).find('.frame').attr('title'),
		fmt = parseInt((title.split('.')).splice(0,2));
	sorted.push(fmt);
}

var sorter = sorted.sort(function(a,b) {return b-a});

console.log(sorter);

//find duplicates
var arr = b;
var sorted_arr = arr.sort(); // You can define the comparing function here. 
// JS by default uses a crappy string compare.
var results = [];
for (var i = 0; i < arr.length - 1; i++) {
    if (sorted_arr[i + 1] == sorted_arr[i]) {
        results.push(sorted_arr[i]);
    }
}

console.log(results);