filter out objects that have the same id

duplicate remover

var array = [{
  'id': 1
}, {
  'id': 2
}, {
  'id': 2
}, {
  'id': 2
}];

var a = array.filter(function (e) {
  return !array.some(function (g) {
    return g.id === e.id && array.indexOf(e) > array.indexOf(g);
  });
});
/// a = [{  'id': 1}, {  'id': 2}]