Helper method to show/hide a menu & update an Icon with Twitter Bootstrap

custom.0.1.js

$('.action').on('click', function(){
    var icon = $(this).find('i');
    var toggleIcon = function (){
        var newIcon = (icon.hasClass('icon-plus')) ? 'icon-minus' : 'icon-plus' ;
        icon.removeClass('icon-plus icon-minus');
        icon.addClass(newIcon);
    }
    toggleIcon();
    var action = $(this).data('action');
    var elem = $(this).data('elem');
    window[action](elem);
});