Как я могу вставить неограниченное количество изображений в эту карусель?

Question

Я должен включить слайдер, который показывает три изображения, а основное всегда находится посередине. Я нашел эту карусель, однако, она ограничена 5 изображениями. Я хотел бы понять, как я могу изменить это, чтобы принимать столько изображений, сколько необходимо.

Нужно быть Pure Javascript codepen: https://codepen.io/KaioRocha/pen/xxGYNwp

const galleryContainer = document.querySelector('.gallery-container');
const galleryControlsContainer = document.querySelector('.gallery-controls');
const galleryControls = ['previous', 'next'];
const galleryItems = document.querySelectorAll('.gallery-item');

class Carousel {
  constructor(container, items, controls) {
    this.carouselContainer = container;
    this.carouselControls = controls;
    this.carouselArray = [...items];
  }

  // Assign initial css classes for gallery and nav items
  setInitialState() {
    this.carouselArray[0].classList.add('gallery-item-first');
    this.carouselArray[1].classList.add('gallery-item-previous');
    this.carouselArray[2].classList.add('gallery-item-selected');
    this.carouselArray[3].classList.add('gallery-item-next');
    this.carouselArray[4].classList.add('gallery-item-last');

    document.querySelector('.gallery-nav').childNodes[0].className = 'gallery-nav-item gallery-item-first';
    document.querySelector('.gallery-nav').childNodes[1].className = 'gallery-nav-item gallery-item-previous';
    document.querySelector('.gallery-nav').childNodes[2].className = 'gallery-nav-item gallery-item-selected';
    document.querySelector('.gallery-nav').childNodes[3].className = 'gallery-nav-item gallery-item-next';
    document.querySelector('.gallery-nav').childNodes[4].className = 'gallery-nav-item gallery-item-last';
  }

  // Update the order state of the carousel with css classes
  setCurrentState(target, selected, previous, next, first, last) {

    selected.forEach(el => {
      el.classList.remove('gallery-item-selected');

      if (target.className == 'gallery-controls-previous') {
        el.classList.add('gallery-item-next');
      } else {
        el.classList.add('gallery-item-previous');
      }
    });

    previous.forEach(el => {
      el.classList.remove('gallery-item-previous');

      if (target.className == 'gallery-controls-previous') {
        el.classList.add('gallery-item-selected');
      } else {
        el.classList.add('gallery-item-first');
      }
    });

    next.forEach(el => {
      el.classList.remove('gallery-item-next');

      if (target.className == 'gallery-controls-previous') {
        el.classList.add('gallery-item-last');
      } else {
        el.classList.add('gallery-item-selected');
      }
    });

    first.forEach(el => {
      el.classList.remove('gallery-item-first');

      if (target.className == 'gallery-controls-previous') {
        el.classList.add('gallery-item-previous');
      } else {
        el.classList.add('gallery-item-last');
      }
    });

    last.forEach(el => {
      el.classList.remove('gallery-item-last');

      if (target.className == 'gallery-controls-previous') {
        el.classList.add('gallery-item-first');
      } else {
        el.classList.add('gallery-item-next');
      }
    });
  }

  // Construct the carousel navigation
  setNav() {
    galleryContainer.appendChild(document.createElement('ul')).className = 'gallery-nav';

    this.carouselArray.forEach(item => {
      const nav = galleryContainer.lastElementChild;
      nav.appendChild(document.createElement('li'));
    }); 
  }

  // Construct the carousel controls
  setControls() {
    this.carouselControls.forEach(control => {
      galleryControlsContainer.appendChild(document.createElement('button')).className = `gallery-controls-${control}`;
    }); 

    !!galleryControlsContainer.childNodes[0] ? galleryControlsContainer.childNodes[0].innerHTML = this.carouselControls[0] : null;
    !!galleryControlsContainer.childNodes[1] ? galleryControlsContainer.childNodes[1].innerHTML = this.carouselControls[1] : null;
  }
 
  // Add a click event listener to trigger setCurrentState method to rearrange carousel
  useControls() {
    const triggers = [...galleryControlsContainer.childNodes];

    triggers.forEach(control => {
      control.addEventListener('click', () => {
        const target = control;
        const selectedItem = document.querySelectorAll('.gallery-item-selected');
        const previousSelectedItem = document.querySelectorAll('.gallery-item-previous');
        const nextSelectedItem = document.querySelectorAll('.gallery-item-next');
        const firstCarouselItem = document.querySelectorAll('.gallery-item-first');
        const lastCarouselItem = document.querySelectorAll('.gallery-item-last');

        this.setCurrentState(target, selectedItem, previousSelectedItem, nextSelectedItem, firstCarouselItem, lastCarouselItem);
      });
    });
  }
}

const exampleCarousel = new Carousel(galleryContainer, galleryItems, galleryControls);

exampleCarousel.setControls();
exampleCarousel.setNav();
exampleCarousel.setInitialState();
exampleCarousel.useControls();

.gallery {
  width: 100%;
  background: pink;
}

.gallery-container {
  align-items: center;
  display: flex;
  height: 400px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  justify-content: space-between;
}

.gallery-item {
  height: 150px;
  opacity: .4;
  position: absolute;
  transition: all 0.3s ease-in-out;
  width: 150px;
  z-index: 0;
}

.gallery-item.gallery-item-selected {
  height: 300px;
  opacity: 1;
  left: 50%;
  transform: translateX(-50%);
  width: 33%;
  z-index: 2;
  background: red;
}

.gallery-item.gallery-item-previous,
.gallery-item.gallery-item-next {
  height: 200px;
  opacity: 1;
  width: 33%;
  z-index: 1;
}

.gallery-item.gallery-item-previous {
  left: -3%;
}

.gallery-item.gallery-item-next {
  left: 70%;
}

.gallery-item.gallery-item-first {
  left: 15%;
  transform: translateX(-50%);
}



.gallery-controls {
  display: flex;
  justify-content: center;
  margin: 30px 0;
}

.gallery-controls button {
  border: 0;
  cursor: pointer;
  font-size: 16px;
  margin: 0 20px;
  padding: 0 12px;
  text-transform: capitalize;
}

.gallery-controls button:focus {
  outline: none;
}

.gallery-controls-previous {
  position: relative;
}

.gallery-controls-previous::before {
  border: solid #000;
  border-width: 0 2px 2px 0;
  content: '';
  display: inline-block;
  height: 4px;
  left: -10px;
  padding: 2px;
  position: absolute;
  top: 0;
  transform: rotate(135deg) translateY(-50%);
  transition: left 0.15s ease-in-out;
  width: 4px;
}

.gallery-controls-previous:hover::before {
  left: -18px;
}

.gallery-controls-next {
  position: relative;
}

.gallery-controls-next::before {
  border: solid #000;
  border-width: 0 2px 2px 0;
  content: '';
  display: inline-block;
  height: 4px;
  padding: 2px;
  position: absolute;
  right: -10px;
  top: 50%;
  transform: rotate(-45deg) translateY(-50%);
  transition: right 0.15s ease-in-out;
  width: 4px;
}

.gallery-controls-next:hover::before {
  right: -18px;
}

.gallery-nav {
  bottom: -15px;
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  position: absolute;
  width: 100%;
}

.gallery-nav li {
  background: #ccc;
  border-radius: 50%;
  height: 10px;
  margin: 0 16px;
  width: 10px;
}

.gallery-nav li.gallery-item-selected {
  background: #555;
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Carousel</title>
  <link rel="stylesheet" href="carousel.css">
</head>
<body>

  <div class="gallery">
    <div class="gallery-container">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=1">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=2">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=3">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=4">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=5">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=1">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=2">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=3">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=4">
      <img class="gallery-item" src="http://fakeimg.pl/300/?text=5">
    </div>
    <div class="gallery-controls"></div>
  </div>

  <script src="carousel.js"></script>
</body>
</html>