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Using Whose Arrays in Javascript to Automate

Play with the new JS for automation using the Script editor. I get an error in the last line:

var iTunes = Application("iTunes");
var sources = iTunes.sources();
var library = sources.whose({name : "Library"});

It is confirmed that the array of sources was as expected (two elements, one with name"Library" and one "Internet Radio"). But this final line is throttled with Error on line 3: TypeError: undefined is not a function (evaluating 'sources.whose({name : "Library"})').

As far as I can tell, I'm using the correct syntax for the functionwhose . (I also tried with an explicit sentence _equalsto the same result.) What am I doing wrong?

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4 answers

, .

(function () {
    'use strict';

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

    return filtered().length;

})();
+2

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items of folder "Desktop" of folder "jsmith" of folder "Users" of startup disk of app "Finder"
items of folder "Desktop" of home of app "Finder"
items of folder "Macintosh HD:Users:jsmith:Desktop" of app "Finder"
items of desktop of app "Finder"
items of app "Finder"
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iTunes () (ObjectSpecifiers), source iTunes:

var iTunes = Application("iTunes");
var sources = iTunes.sources();

, , JavaScript , . , , :

var iTunes = Application("iTunes");
var sourcesSpecifier = iTunes.sources;
var librarySpecifier = sourcesSpecifier.whose({name : "Library"});

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+6

JavaScript Mail.inbox.messages.whose(...) :

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

" whose" ", ", ( ) OS X JavaScript.

, whose JXA, , OS X v.10.10.

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1

var iTunes = Application('iTunes');
var sources = iTunes.sources();
var librarySource = null;
for (key in sources) {
    var name = sources[key].name();
    if (name.localeCompare("Library") == 0) {
        librarySource = sources[key];
    }
}

2

var iTunes = Application('iTunes');
var sources = iTunes.sources();
function hasLibraryName(obj) {
    var name = obj.name();
    if (name.localeCompare("Library") == 0) {
        return true;
    }
    return false;
}
var filtered = sources.filter(hasLibraryName);
0

OS X 10.11.5 .

library = Application("iTunes").sources.whose({name:'Library'})()[0]

library.properties()

// {"class":"source", "id":64, "index":1, "name":"Library", "persistentID":"2D8F973150E0A3AD", "kind":"library", "capacity":0, "freeSpace":0}

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library = Application("iTunes").sources.whose({kind:"kLib"})()[0]
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