voku / Arrayy

   *

   * @return static <p>(Immutable)</p>

   */

  public function firstsImmutable(int $number = null)

  {

    if ($number === null) {

      $arrayTmp = $this->array;

      $array = (array)\array_shift($arrayTmp);

    } else {

      $number = (int)$number;

      $arrayTmp = $this->array;

      $array = \array_splice($arrayTmp, 0, $number, true);

    }

    return static::create($array, $this->iteratorClass, false);

  }

  /**

   * Get the first value(s) from the current array.

   *

   * @return static <p>(Immutable)</p>

   */

  public function split(int $numberOfPieces = 2, bool $keepKeys = false)

  {

    $arrayCount = \count($this->array, COUNT_NORMAL);

    if ($arrayCount === 0) {

      $result = [];

    } else {

      $splitSize = (int)\ceil($arrayCount / $numberOfPieces);

      $result = \array_chunk($this->array, $splitSize, $keepKeys);

    }

    return static::create($result, $this->iteratorClass, false);

  }

  /**

   * Stripe all empty items.