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// <div class="counter">0</div>

let from = 0;
const to = 4.9;
const time = 1000;
const substract = to - from;
const refresh = 20;
const counter = document.querySelector('.counter');

const loops = time / refresh;
const increment = substract / loops;
const delay = time / loops;

// const startTime = +new Date();

const interval = setInterval(() => {
    from += increment;
    counter.innerText = `${from.toFixed(2)}`;
  
    if (from >= to) {
      // console.log('Time:', +new Date() - startTime);
      counter.innerText = `${to.toFixed(2)}`;
      clearInterval(interval);
    }

}, delay);

// https://codepen.io/anon/pen/ajVKpG