color_stuff.js

(function() {
    var color_stuff = function(selector,classes) {
        var nth_of_type = function(len,i) {
            return ':nth-of-type(' + len + 'n+' + i + ')'
        };
        var nested = function(c) {
            return function() {
                var cs = classes.filter(function(e) { return e !== c });
                for (var i = 0; i < cs.length; i++)
                    $(this).children(selector + nth_of_type(cs.length,i))
                           .each(nested(cs[i]));
                $(this).addClass(c);
            };
        };
        nested(classes[0]).call(this);
    };
    color_stuff.call($('#comments'),'div',['color-1', 'color-2', 'color-3']);
})()