JSFiddle - React, Tailwind, and code Playground

HTML

<button class="btn-next--js">next</button>

JavaScript

var nextBtn = document.querySelector('.btn-next--js');

function Slider(nextBtn) {
  this.images = ['hello', 'world'];

  nextBtn.onclick = () => {
    console.log(this.images)
  };
}

var mySlider = new Slider(nextBtn);