JSFiddle - React, Tailwind, and code Playground

HTML

<li>
    <div class="hide video_id keep">50</div>
    <div class="hide video_id keep">49</div>    
    <div class="hide video_id">48</div>
    <div class="hide video_id">47</div>
</li>

JavaScript

var numbers = [];
$(".video_id:not(.keep)").each(function () {
   numbers.push($(this).text());
});
alert(numbers.join(","));