save htmlcollection to object prevent redraw code example
Example 1: html collection of elements to array
const boxes = Array.from(document.getElementsByClassName('box'));
Example 2: html collection of elements to array
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<script>
const boxes = document.getElementsByClassName('box');
</script>