watchCollection.js

$scope.firstTeam = [{
  first: 'steph',
  last: 'curry'
}, {
  first: 'lebron',
  last: 'james'
}];
$scope.$watchCollection('firstTeam', function(firstTeamArray) {
  console.log("change to the first team! ", JSON.stringify(firstTeamArray));
});

$timeout(function() {
  $scope.firstTeam.push({first: 'russel', last: 'westbrook'});
}); // new member, print!

$timeout(function() {
  $scope.firstTeam.sort(function(player1, player2) {
    if (player1.first < player2.first) return -1;
  });
}, 300); // reordering, print!

$timeout(function() {
  $scope.firstTeam[0].height = 75;
}, 600); // member mutation, no print