Today, when working on UMapper plugin, I tried to use jQuery – and failed. Although jQuery is now in WP core, $ shortcut wasn’t working. As it turned out, WP team (quite rightly!) used JQuery.noConflict – which helps avoiding naming conflict with similar libraries, such as prototype. So, we cannot use $ shortcut function, which is quite annoying. In order to overcome this limitation the following construct can be used:

jQuery(document).ready(function($){
    // inside this block you can use $ shortcut !!
});

Just a small note to myself :)

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