JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-1.x-git.min.js"></script>
<entries>
  <entry id="1" />
  <entry id="2" />
  <entry id="3" />
  <entry id="4" />
</entries>

JavaScript

var arr = $.map($('entry'), function(el) {
     return $(el).attr('id');
});
console.log(arr);