A basic jQuery plugin file

jquery_basic_plugin.js

;(function ( $, window, document, undefined ) {

    // Create the defaults once
    var pluginName = 'defaultPluginName',
        defaults = {
            propertyName: "value"
        };

    // The actual plugin constructor
    function Plugin( element, options ) {
        this.element = element;

        this.options = $.extend( {}, defaults, options) ;

        this._defaults = defaults;
        this._name = pluginName;

        this.init();
    }

    Plugin.prototype = {
        
        init: function() {
           this.yourOtherFunction(this.element, this.options).
        }, 
        
        yourOtherFunction: function(el, options) {
            // some logic
        }
    };

    $.fn[pluginName] = function ( options ) {
        return this.each(function () {
            if (!$.data(this, 'plugin_' + pluginName)) {
                $.data(this, 'plugin_' + pluginName,
                new Plugin( this, options ));
            }
        });
    }

})( jQuery, window, document );