JSFiddle - React, Tailwind, and code Playground

HTML

<div id="home"></div>
<span id="test"></span>
<p id="what"></p>

JavaScript

listy = $("*[id]").map(function(){
    return this.id;
 }).get();

console.log(toObject(listy));
    
function toObject(arr) {
    var rv = {};
    for (var i = 0; i < arr.length; ++i)
        if (arr[i] !== undefined) rv[i] = arr[i];
    return rv;
}