Best way to reset all values in an Javascript object

Here is my solution with lodash mapValues function:

var $clearObject = function(value) {
  if (_.isString(value)) {
    return undefined
  };
  if (_.isArray(value)) {
    return [];
  };
};

var $scopeDisplay = {
  current: {
    key1: 'value1',
    key2: ['a', 'b'],
    key3: 'value2'
  }
};

$scopeDisplay.current = _.mapValues($scopeDisplay.current, $clearObject);

console.log($scopeDisplay);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>

I would create a helper function returning object structure:

function getDisplayObject() {
    return {
        current: {
            key1: undefined, // or you can omit undefined keys
            key2: [],
            key3: undefined
        }
    };
}

$scope.display = getDisplayObject();

So later when you need to reset data you would execute $scope.display = getDisplayObject(); again.