Using “whose” on arrays in Javascript for Automation

Question

Playing with the new JS for automation using Script Editor. I\'m getting an error on the final line of the following:

var iTunes = Application(\"iTunes\");
var s         


        

Answer 1

This now works as theory would predict.

(function () {
    'use strict';

    var iTunes = Application('iTunes'),
        filtered = iTunes.sources.whose({
            name: 'Library'
        });

    return filtered().length;

})();