$watch testing

html

    <div ng-app="watchApp" ng-controller="watchCtrl">
      <div ng-repeat="a in b">
        <input type="text" ng-model="a.value" />{{a.value}}
      
            
       </div>
         <div ng-repeat="a in c">
                <input type="text" ng-model="a.value" />{{a.value}}
          </div>


        <div id="test"></div>
</div>

js

angular.module('watchApp', []).controller('watchCtrl', function($scope) {
    $scope.count = 0;
    $scope.b = [{value: 1},
    {value: 2},
    {value: 3},
    {value: 4},
    {value: 5},
    {value: 6}];
    
    $scope.c = [
        {value:"a"},
        {value:"b"},
        {value:"c"},
        {value:"d"},
        {value:"e"},
        {value:"f"}
        ];

    $scope.$watch('c', function() {
        // do something here
        
        if($scope.count > 1){
            $scope.b[0].value = "TWENTY";
        }
        $scope.count += 1;
    }, true);
});