JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Garbage collection measurement</h2>
<h3>Start Chrome via command line</h3>

<p>Linux:</p>
<code>google-chrome --enable-precise-memory-info</code>

<p>OSX:</p>
<code>open -a "Google Chrome" --args --enable-precise-memory-info</code>

<h3>Status:</h3>
<p id="p"></p>

JavaScript

var p = document.getElementById("p");

setInterval(function(){
    var before = window.performance.memory.usedJSHeapSize;
    
    // --- enter your code here ---
    new Object();
    // --- end of your code ---
    
    var diff = window.performance.memory.usedJSHeapSize - before;
    if(diff-40>=0)
        p.innerHTML = (diff-40)+" bytes allocated in the loop";
    else
        p.innerHTML = "Are you sure you started chrome with the <code>--enable-precise-memory-info</code> flag?";
}, 100);