oliverdavies.uk/modules/opd_daily_emails/src/DailyEmails.php

<?php

declare(strict_types=1);

namespace Drupal\opd_daily_emails;

use Drupal\node\NodeInterface;
use Webmozart\Assert\Assert;

final class DailyEmails implements \Countable {

  /**
   * @param array<positive-int, NodeInterface> $emails
   */
  private function __construct(
    private array $emails,
  ) {
    Assert::allIsInstanceOf($emails, NodeInterface::class);
  }

  public function count(): int {
    return count($this->emails);
  }

  public function first(): NodeInterface {
    return array_values($this->emails)[0];
  }

  public static function fromEmails(array $emails): self {
    return new self($emails);
  }

}