angularjs - extend recursive

Question

I would like to extend some properties recursive (aka. deep copy). much like jQuery does. I'm not including jquery only b/c of one thing.

jQuery.extend( true, target, object1 )

is there any elegant way you know of that does it with simple javascript or angularjs?

update please take a look and try to accomplish the same result http://plnkr.co/edit/GHabYbyhsqtfBPtplksO?p=preview

i did look into .copy() but the "properties (for objects) are deleted"

Answer 1

Here is an extendDeep function based off of the angular.extend function. If you add this to your $scope, you would then be able to call

$scope.meta = $scope.extendDeep(ajaxResponse1.myMeta, ajaxResponse2.defaultMeta);

and get the answer you are looking for.

$scope.extendDeep = function extendDeep(dst) {
  angular.forEach(arguments, function(obj) {
    if (obj !== dst) {
      angular.forEach(obj, function(value, key) {
        if (dst[key] && dst[key].constructor && dst[key].constructor === Object) {
          extendDeep(dst[key], value);
        } else {
          dst[key] = value;
        }     
      });   
    }
  });
  return dst;
};

Note: This function has the side-effect of copying values from later arguments into the earlier arguments. For a simple fix to this side effect, you can change dst[key] = value to dst[key] = angular.copy(value).