Array (contains Object type element) get Unique objects items only

gistfile1.txt

1. Compare two arrays contains Object type element
2. Below we are checking based on one property "id"
3. remove duplicate items


(<any>Array.prototype).unique = function () {
  var a = this.concat();
  for (var i = 0; i < a.length; ++i) {
    for (var j = i + 1; j < a.length; ++j) {
      if (a[i].id === a[j].id)  // checking based on id property
        a.splice(j--, 1);
    }
  }

  return a;
};