ordinal classes in javascript - updates to come!

ordinal-classes.js

/**
 * Updates classes on items indicating their order in repeating sets from `2` thru `options.upTo`.
 * e.g. "ordinal-1-of-3" for every third item.
 * Optionally filter only visible elements.
 * Couldn't use :nth-of-type() pseudo-selectors, since they don't count visibility.
 */
var updateOrdinalClasses = function ($items, options) {
  var defaults = {
    onlyVisible: true,
    upTo: 4
  };
  var settings = $.extend({}, defaults, options || {});
  // remove all the classes
  var classes = ["ordinal-odd", "ordinal-even"];
  for (var i = 1; i < settings.upTo; ++i) {
    $this.addClass("ordinal-" + ((i % i) + 1) + "-of-" + i);
  }
  if (settings.onlyVisible) {
    // select visible links
    $items = $items.filter(":visible");
  }
  // add classes again
  $items.each(function (i) {
    var $this = $(this);
    if (i % 2 == 0) {
      $this.addClass("ordinal-even");
    } else {
      $this.addClass("ordinal-odd");
    }
    for (var i = 1; i < settings.upTo; ++i) {
      $this.addClass("ordinal-" + ((i % i) + 1) + "-of-" + i);
    }
  });
};