javascript - Lodash get repetition count with the object itself -

i have array of objects like:

[  { "username": "user1", "profile_picture": "testjpg", "id": "123123", "full_name": "user 1" }, { "username": "user2", "profile_picture": "testjpg", "id": "43679144425", "full_name": "user 2" }, { "username": "user2", "profile_picture": "testjpg", "id": "43679144425", "full_name": "user 2" } ] 

i want get:

[  { "username": "user1", "profile_picture": "testjpg", "id": "123123", "full_name": "user 1", "count": 1 }, { "username": "user2", "profile_picture": "testjpg", "id": "43679144425", "full_name": "user 2", "count": 2 } ] 

i've used lodash a.k.a. underscore method failed process it.

var uniquecomments =  _.chain(comments).uniq(function(item) { return item.from.id; }).value();     var rescomment = [];     _.foreach(uniquecomments, function(unco) {         unco.count = _.find(comments, function(comment) {             return unco.id === comment.id         }).length;          rescomment.push(unco);     }); 

the result should in rescomment.

edit: updated array of objects.

i'd using _.reduce(), since that's you're doing--reducing given array (potentially) smaller array containing different sort of object.

using _.reduce(), you'd this:

var rescomment = _.reduce(comments, function(mem, next) {     var username = next.username;     var existingobj = _.find(mem, function(item) { return item.username === username; });     existingobj ? existingobj.count++ : mem.push(_.extend(next, {count: 1}));     return mem; }, []); 

and here jsfiddle.