Method isBusy

src/Pipe.js:721–724

* Returns true if at least one of the bricks is busy. * @return {boolean}

()

   * @return {boolean}
   */
  isBusy () {
    return this._bricks.reduce((busy, brick) =>
      busy || this._getBrickState(brick, 'busy'), false)
  }

  /**
   * Returns lower bucket index for given brick.