Drupal - Get values of a View result row.

get_view_result_values.php

<?php

/**
 * Get the value out of a view Result for a given date field.
 *
 * @param \Drupal\views\ResultRow $result
 *   A given view result.
 * @param \Drupal\views\Plugin\views\field\EntityField $field
 *   A given date field.
 *
 * @return array
 *   Either the timestamp or nothing.
 */
function get_row_values_from_view_field(ResultRow $row, EntityField $field) {
  $delta = 0;
  if ($delta_field = $field->aliases['delta'] ?? NULL) {
    $delta = $row->{$delta_field} ?? 0;
  }

  // Get the result we need from the entity.
  $items = $field->getItems($row) ?? [];
  $item = $items[$delta]['raw'] ?? NULL;
  return $item instanceof FieldItemInterface ? $item->getValue() : [];
}