Plugin design recommendations

Now that we have examined common ways to extend jQuery and jQuery UI by creating plugins, we can review and supplement what we've learned with a list of recommendations:

• Protect the dollar ($) alias from potential interference from other libraries by using jQuery instead or passing $ into an IIFE, so that it can be used as a local variable.
• Whether extending the jQuery object with $.myPlugin or the jQuery prototype with $.fn.myPlugin, add no more than one property to the $ namespace. Additional public methods and properties should be added to the plugin's namespace (for example, $.myPlugin.publicMethod or $.fn.myPlugin.pluginProperty).
• Provide an object containing default options for the plugin: $.fn.myPlugin.defaults = {size: 'large'}.
• Allow the plugin user to optionally override any of the default settings for all subsequent calls to the method ($.fn.myPlugin.defaults.size = 'medium';) or for a single call ($('div').myPlugin({size: 'small'});).
• In most cases when...