JSFiddle - React, Tailwind, and code Playground

HTML

<div class = "comment 12">comment text 12</div>
<div class = "comment 12">comment text 12</div>
<div class = "comment 12">comment text 12</div>
<div class = "comment 12">comment text 12</div>
<div class = "comment 12">comment text 12</div>

<div class = "comment 13">comment text 13</div>
<div class = "comment 13">comment text 13</div>
<div class = "comment 13">comment text 13</div>

<div class = "comment 14">comment text 14</div>

<div class = "comment 15">comment text 15</div>

JavaScript

$('.comment').each(function() {

    var currentclass = $.trim($(this).attr('class').replace('comment', ''));
    
    console.log($('.comment.' + currentclass));
    
    if ($('.comment.' + currentclass).length > 1) {
        $(this).remove();
    }
    
});