Method insert

lib/script/stack.js:247–257

* Insert an item. * @param {Number} index * @param {Buffer} item * @returns {Buffer}

(index, item)

   */

  insert(index, item) {
    if (index < 0)
      index += this.items.length;

    assert(Buffer.isBuffer(item));
    assert(index >= 0 && index <= this.items.length);

    this.items.splice(index, 0, item);

    return this;
  }

  /**
   * Erase stack items.