This is a patch that supports reduce function for jQuery.

jQuery.reduce patch

$.reduce = function(arr, reduce_cb, prev) {
    arr = arr.toArray();
    if (Array.prototype.reduce) {
        return Array.prototype.reduce.call(arr, reduce_cb, prev);
    }
    $.each(arr, function(i, cur) {
        result = reduce_cb.call(null, prev, cur, i, arr);
        prev = cur;
    });
    return result;
};
 
$.fn.reduce = function (cb, prev) {
    return $.reduce(this, function(prev, cur, i, arr) {
        return cb.call(null, prev, cur, i, arr);
    }, prev);
};