[jQuery] Is array empty?

[shapper]

Hello,

I have the folllowing:

        var levels = [];
        $levels = $('input[name="Levels"]:checked +
label');
        levels = $levels.map(function() { return $
(this).text(); }).get();

How can I check if levels array is empty?

I tried levels, levels.val(), etc but I was not able to make this
work.

Thanks,
Miguel