equalizeHeights.js, a responsive-layout aware height equalizer

jquery.equalizeHeights.js

/*!
* equalizeHeights
* Force a number of elements to acquire the height of the tallest element
* Recalculate all heights on page resize
* Author: @rquigley
* Licensed under the MIT license
*/
(function (factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery', 'underscore'], factory);
    } else {
        // Browser globals
        factory(jQuery);
    }
}(function ($, _) {
    var cache = [];
    var equalize = function(obj) {
        var els = obj.els,
            includeMargin = obj.includeMargin,
            maxHeight = 0;

        els.each(function() {
            var h = $(this).outerHeight(includeMargin);
            if (h > maxHeight) {
                maxHeight = h;
            }
        });

        els.css('height', maxHeight);
    };

    $.fn.equalizeHeight = function(includeMargin) {
        var o = {
            'els': $(this),
            'includeMargin': includeMargin
        };

        cache.push(o);

        equalize(o);

        return this;
    };

    var onPageResize = function() {
        var obj, n;

        for (n = cache.length - 1; n >= 0; --n) {
            obj = cache[n];
            obj.els.css('height', 'auto');
            equalize(obj);
        }
    };

    $(window).on('resize', _.debounce(onPageResize, 300));
}));