JavaScript OSA to remove track numbers in song names

Remove the First 3 Characters from Name.scpt

var PREFIX_LENGTH = 3;

var itunes = Application('iTunes'),
    selection = itunes.selection();

for (var i=0; i<selection.length; i++) {
    var song = selection[i],
        trackNumber = parseInt(song.name().slice(0, PREFIX_LENGTH), 10),
        name = song.name().slice(PREFIX_LENGTH);
    if (!isNaN(trackNumber)) {
        song.trackNumber.set(trackNumber);
        song.name.set(name);
    }
}