gistfile1.txt

var accordion = (function ($) {

    'use strict'

    var accordionMethods = {},
        tabsList,
        tabWrapper,
        tabSelector,
        tabWrapper,
        tabActiveClass;

    accordionMethods.init = function (config) {
        // ES6 https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Functions/default_parameters
        tabSelector = config.tabSelector || '.accordion-tab';
        tabWrapper = config.tabWrapper || '.accordion-wrapper';
        tabActiveClass = config.tabActiveClass || 'accordion-expanded';

        tabsList = $(tabSelector);
        tabWrapper = $(tabWrapper);

        accordionMethods.destroy();

        tabsList
            .first()
            .addClass(tabActiveClass);

        initEvents();
    }

    var initEvents = function () {
       tabWrapper.on('click.accordion', tabSelector, function(){
           tabsList.not(this).removeClass(tabActiveClass);
           $(this).addClass(tabActiveClass);
       });
    }

    accordionMethods.destroy = function () {
        tabsList.removeClass(tabActiveClass)
        tabWrapper.off('click.accordion');
    }

    return accordionMethods;
}(jQuery));

// Usage
accordion.init({
    tabSelector: '.tab-2'
});

accordion.init();
accordion.destroy();