Слайдер на JS

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if(document.querySelector(".img_random")) {
  const slides = document.querySelectorAll('.img_random .img');
  let index = 0;
  const activeSlide = n => {
    for(slide of slides) {
      slide.classList.remove('active');
    }
    slides[n].classList.add('active');
  }
  const prepareCurrentSlide = ind => {
    activeSlide(index);
  }
  const nextSlide = () => {
    if(index == slides.length - 1) {
      index = 0;
      prepareCurrentSlide(index);
    }else {
      index++;
      prepareCurrentSlide(index);
    }
  }
  const prevSlide = () => {
    if(index == slides.length - 1) {
      index = 0;
      prepareCurrentSlide(index);
    }else {
      index++;
      prepareCurrentSlide(index);
    }
  }
  setInterval( nextSlide, 4000 );
  }

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<div class="img_random">
<div class="img"><img src="img/main/main.jpg" alt="img"></div>
<div class="img"><img src="img/main/imag01.jpg" alt="img"></div>
<div class="img"><img src="img/main/imag02.jpg" alt="img"></div>
<div class="img"><img src="img/main/imag03.jpg" alt="img"></div>
<div class="img"><img src="img/main/imag04.jpg" alt="img"></div>
<div class="img"><img src="img/main/imag05.jpg" alt="img"></div>
</div>