A simple :data(key) selector for jQuery

jquery.pseudo.data.js

// jQuery UI has a :data selector. I wanted to have it without including jQuery UI.
// To find out how all of this works, read the Sizzle documentation:
// https://github.com/jquery/sizzle/wiki/Sizzle-Documentation
// Thanks to @_Tomalak for inspiring me to check this out.

jQuery.expr.pseudos.data = jQuery.expr.createPseudo(function (key) {
    return function (el) {
        return !!jQuery.data(el, key);
    };
});

I always used the following

jQuery.extend(jQuery.expr[":"], {
    data : function(el, i, m) {
        return !!jQuery.data(el, m[3]);
    }
});

But yours seems more convenient.