Collection

find

found = _.find(self.villages(), function (village) {
    return village.id() === searchId();
});

pluck

var stooges = [
      {name : 'moe', age : 40},
      {name : 'larry', age : 50},
      {name : 'curly', age : 60}
];
_.pluck(stooges, 'name');

=> ["moe", "larry", "curly"]

self.villages.pluck('population');