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Creates a deep copy of `source`, which should be an object or an array.

- If no destination is supplied, a copy of the object or array is created.
- If a destination is provided, all of its elements (for array) or properties (for objects) are deleted and then all elements/properties from the source are copied to it.
- If `source` is not an object or array (inc. `null` and `undefined`), `source` is returned.
- If `source` is identical to 'destination' an exception will be thrown.

## Usage

`angular.copy(source, [destination]);`

### Arguments

Param | Type | Details
--- | --- | ---
source | * | The source that will be used to make a copy. Can be any type, including primitives, `null`, and `undefined`.
destination (optional) | Object Array | Destination into which the source is copied. If provided, must be of the same type as `source`.

### Returns

* | The copy or updated `destination`, if `destination` was specified.

## Example

Edit in Plunker

    <div ng-controller="Controller">
    <form novalidate class="simple-form">
    Name: <input type="text" ng-model="user.name" /><br />
    E-mail: <input type="email" ng-model="user.email" /><br />
    Gender: <input type="radio" ng-model="user.gender" value="male" />male
    <input type="radio" ng-model="user.gender" value="female" />female<br />
    <button ng-click="reset()">RESET</button>
    <button ng-click="update(user)">SAVE</button>
    </form>
    <pre>form = {{user | json}}</pre>
    <pre>master = {{master | json}}</pre>
    </div>

    <script>
    function Controller($scope) {
       $scope.master= {};

       $scope.update = function(user) {
         // Example with 1 argument
         $scope.master= angular.copy(user);
       };

       $scope.reset = function() {
         // Example with 2 arguments
         angular.copy($scope.master, $scope.user);
       };

       $scope.reset();
     }
    </script>