View results use a classed object

In Drupal 7 each view result returned from its query was a stdClass object. In Drupal 8 this has been changed so each view result will be an instance of Drupal\views\ResultRow.

E.g.

Drupal 7:

function render_link($data, $values) {}

Drupal 8:

protected function renderLink($data, ResultRow $values) {}