angularjs - angular edit each post in array -

i have array of posts:

.factory('posts', [function(){   var o = {     posts: [         {title: 'post 1', upvotes: 5},         {title: 'post 2', upvotes: 2},         {title: 'post 3', upvotes: 15}     ]   };   return o; }]) 

and controller. edit upvotes when clicking button, have following.

angular.foreach($scope.posts, function(title){     $scope.posts.push({             title: "ja"     }); }); 

but creating new posts. knows how edit existing ones? thanks

to update upvotes value of posts on clicking button have change foreach to:

angular.foreach($scope.posts, function(post){     post.upvotes++; }); 

but if specifc 1 called 'ja' need this:

angular.foreach($scope.posts, function(post){     if (post.title === 'ja') {         post.upvotes++;     } });