Angular: How to filter json with specific keys

Question

I am getting a json from multiselect items which are checked. How do I filter json based on specific keys only from the below original json:

Original Json:

 {
        "Reward": [{
            "RewardType": 1,
            "RewardTypeValue": "PartCodes",
            "RewardCode": "CB_USD_20_US",
            "DiscountValue": 20.0
        },
        {
            "RewardType": 1,
            "RewardTypeValue": "PartCodes",
            "RewardCode": "CB_USD_30_US",
            "DiscountValue": 30.0
        },
        {
            "RewardType": 1,
            "RewardTypeValue": "PartCodes",
            "RewardCode": "CB_USD_40_US",
            "DiscountValue": 40.0
        },
        {
            "RewardType": 1,
            "RewardTypeValue": "PartCodes",
            "RewardCode": "CB_USD_50_US",
            "DiscountValue": 50.0
        }]

    }

At this below code, I am trying to get only RewardType,RewardCode and DiscountType before calling "push" for "selectedRewards"

Angular Code:

  $scope.rewards = [];
$scope.toggleSelection = function toggleSelection(selectedRewards) {
   var idx = $scope.rewards.indexOf(selectedRewards);
   console.log(selectedRewards);

   // is currently selected
   if (idx > -1) {
     $scope.rewards.splice(idx, 1);
   }

   // is newly selected
   else {

     $scope.rewards.push(selectedRewards);
   }
   console.log($scope.rewards);
};

Html code:

<li ng-repeat="reward in RewardsList ">
           <input id="{{reward.RewardCode}}.{{reward.RewardType}}"
                  type="checkbox"
                  ng-checked="selection.indexOf(reward.RewardCode) > -1"
                  ng-click="toggleSelection(reward)"
                  value="{{reward.RewardCode}}" /> 
    <label  for="{{reward.RewardCode}}">{{reward.RewardCode}}</label>
    </li>

here is the expected json I am trying to get:

{
        "Reward": [{
            "RewardType": 1,
            "RewardCode": "CB_USD_20_US",
            "DiscountValue": 20.0
        },
        {
            "RewardType": 1,
            "RewardCode": "CB_USD_30_US",
            "DiscountValue": 30.0
        },
        {
            "RewardType": 1,
            "RewardCode": "CB_USD_40_US",
            "DiscountValue": 40.0
        },
        {
            "RewardType": 1,
            "RewardCode": "CB_USD_50_US",
            "DiscountValue": 50.0
        }]

    }

Answer 1

The following fixed my issue:

Code:

$scope.rewards.push({"RewardType":selectedRewards.RewardType, "RewardCode":selectedRewards.RewardCode," "DiscountValue":selectedRewards.DiscountValue});