Check if a plugin is loaded (Javascript)

gistify496067.js

if($().nombrePlugin) {
    // if nombrePLugin is loaded and available
}

//OR

if($.fn.nombrePlugin !== undefined) {
    // if nombrePLugin is loaded and available
}

//Similar to above but Safe when you are using other JS frameworks Mootools etc.

if(jQuery().nombrePlugin) {
    // if nombrePLugin is loaded and available
}

//OR

if(jQuery.fn.nombrePlugin !== undefined) {
    // if nombrePLugin is loaded and available
}