JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://jshashtable.googlecode.com/files/jshashtable-3.0.js"></script>

JavaScript

var h = new HashTable();

var x = { y: { value : 10 } };

hash.put(x, 10);
x.y.value = 10;
console.log(hash.get(x));