class Slider {

  constructor(object) {
    this.prevButton = object.prevButton;
    this.nextButton = object.nextButton;
    this.activeClass = object.activeClass;
    this.images = object.images;
    this.iterator = 0;  

    this.prevButton.onclick = function() {
      this.prev();
    }

    this.nextButton.onclick = function() {
      this.next();
    }
  }
  

  

  prev() {
    if (this.iterator <= 0) {
      this.iterator = this.images.length - 1;
    }
    images[this.iterator].removeClass(this.activeClass);
    images[--this.iterator].addClass(this.activeClass);
  }

  next() {
    if (this.iterator >= this.images.length) {
      this.iterator = 0;
    }
    images[this.iterator].removeClass(this.activeClass);
    images[++this.iterator].addClass(this.activeClass);
  }
};