initSlides_() {
    let slideNumber = this.plugins.hash.constructor.getSlideNumber();

    // Not valid
    if (slideNumber === null ||
        slideNumber >= this.maxSlide_) {
      slideNumber = 0;
    }

    // Keeping the order
    if (slideNumber !== 0) {
      let i = 0;

      while(i < slideNumber) {
        this.slides[i].moveAfterLast();
        i++;
      }
    }

    this.goToSlide(slideNumber);
  }
Init the shown slide on load. It'll fetch it from the Hash if present
and, otherwise, it'll default to the first one.
@private
@see Hash.getSlideNumber