$scope.findChid = function(obj,arr){
        
        if(obj && obj.children && obj.children.length>0){
            arr.push({
                list:obj.children,
                select:obj.children[0]
            });
            $scope.findChid(obj.children[0], arr);
        }else{
            return arr;
        }

    }

obj.children.length>0

   $scope.findChid = function(obj,arr){
        
        if(obj && obj.children && obj.children.length>0){
            arr.push({
                list:obj.children,
                select:obj.children[0]
            });
            return $scope.findChid(obj.children[0], arr);
        }else{
            return arr;
        }

    }