JSFiddle - React, Tailwind, and code Playground

HTML

<input id="test1" type='text' class="someClass" />
<input id="test2" type='text' class="someClass" />
<input id="test3" type='text' class="someClass" />
<input id="test4" type='text' class="someClass" />
<input id="test5" type='text' class="someClass" />

JavaScript

$(function(){
var idArray = $(".someClass").map(function(){
    return this.id
}).get().join(',');

alert (idArray);
});