voku / Arrayy

   *

   * @return static <p>(Immutable) Return an Arrayy object, with the prefixed keys.</p>

   */

  public function appendToEachKey($prefix)

  {

    $result = [];

    foreach ($this->array as $key => $item) {

      if ($item instanceof self) {

        $result[$prefix . $key] = $item->appendToEachKey($prefix);

      } elseif (\is_array($item)) {

        $result[$prefix . $key] = self::create($item)->appendToEachKey($prefix)->toArray();

      } else {

        $result[$prefix . $key] = $item;

      }

    }

    return self::create($result);

  }

  /**

   * Add a prefix to each value.

   *

   * @return static <p>(Immutable) Return an Arrayy object, with the prepended keys.</p>

   */

  public function prependToEachKey($suffix)

  {

    $result = [];

    foreach ($this->array as $key => $item) {

      if ($item instanceof self) {

        $result[$key] = $item->prependToEachKey($suffix);

      } elseif (\is_array($item)) {

        $result[$key] = self::create($item)->prependToEachKey($suffix)->toArray();

      } else {

        $result[$key . $suffix] = $item;

      }

    }

    return self::create($result);

  }

  /**

   * Add a suffix to each value.