javascript - Array mapping in Angular -

my json object

$scope.selecteditems ={     "records": [         {             "id": 23040035705987,             "arriveddate": "2015/04/24",             "expirationdate": null,             "replaceddate": null,             "processdate": "2015/04/24"         },         {             "id": 23070041800654,             "arriveddate": "2015/04/24",             "expirationdate": null,             "replaceddate": null,             "processdate": "2015/04/27"         },         {             "id": 23040035705984,             "arriveddate": "2015/04/24",             "expirationdate": null,             "replaceddate": null,             "processdate": "2015/04/24"         },         {             "id": 23040035705983,             "arriveddate": "2015/04/24",             "expirationdate": null,             "replaceddate": null,             "processdate": "2015/04/24"         }     ] } 

what trying

for every unique process dates have need corresponding ids in separate object in below mentioned object process date 24/04/2015 matches ids ending 83,84,87 , process date 27/04/2015 matches id ending 54

my expected json object

{     "processdate": [         "2015/04/24",         "2015/04/27"     ],     "id": [         [             23040035705983,             23040035705984,             23040035705987         ],         [             23070041800654         ]     ] } 

how trying

angular.foreach($scope.selecteditems.records, function ( item ) {                  $scope.processdate = item.processdate;                 if($scope.processdatesselected.indexof($scope.processdate) == -1){                   $scope.processdatesselected.push($scope.processdate);                 }                  if($scope.processdatesselected.indexof($scope.processdate) != -1 && $scope.id.indexof(item.id) == -1 ){                     $scope.id.push(item.id);                 }              });    $scope.changesselected.push({processdate:$scope.processdatesselected,ids:$scope.id});   console.log(json.stringify($scope.changesselected)); 

issue id not mapping accordingly , have created plunker same (http://plnkr.co/edit/mklxdokayaqydddhefeu?p=preview) appreciated.

you want make array each date, should take int account date during id array creation

check this: http://plnkr.co/edit/vrig4p9sgzh8kk7bkyet?p=preview

at first must find item index first array , add element on proper position.

var processdateindex = $scope.processdatesselected.indexof($scope.processdate); if(processdateindex != -1 && $scope.id.indexof(item.id) == -1 ){   if ($scope.id.length < processdateindex+1)   {     $scope.id.push([]);   }     $scope.id[processdateindex].push(item.id); } 

you can use structure this. maintanance collection:

{     "processdate": [         {              date: "2015/04/24",             ids: [                 23040035705983,                 23040035705984,                 23040035705987             ]         },         {             date: "2015/04/27",             ids: [                 23070041800654             ]         }     ] }