jQuery Accordion with Slide Animation

(function($) {
    'use strict';

    var $accordion = $('.ifci-accordion');

    $accordion.on('click', '.ifci-accordion-trigger', function(e) {
        e.preventDefault();

        var $trigger = $(this);
        var $item    = $trigger.closest('.ifci-accordion-item');
        var $content = $item.find('.ifci-accordion-content');
        var isOpen   = $trigger.attr('aria-expanded') === 'true';

        // Close all other items.
        $accordion.find('.ifci-accordion-trigger').not($trigger)
            .attr('aria-expanded', 'false')
            .closest('.ifci-accordion-item')
            .find('.ifci-accordion-content')
            .slideUp(250);

        // Toggle current item.
        $trigger.attr('aria-expanded', String(!isOpen));
        $content.slideToggle(250);
    });

    // Open the first item by default.
    $accordion.find('.ifci-accordion-item:first-child .ifci-accordion-trigger')
        .attr('aria-expanded', 'true')
        .closest('.ifci-accordion-item')
        .find('.ifci-accordion-content')
        .show();
})(jQuery);