JSFiddle - React, Tailwind, and code Playground

HTML

Object 1 ID: <span id="object-1"></span><br>
Object 2 ID: <span id="object-2"></span>

JavaScript

(function() {
    var lastStorageId = 0;

    this.Object.hash = function(object) {
        var hash = object.__id;

        if (!hash)
             hash = object.__id = lastStorageId++;

        return '#' + hash;
    };
}());

var array = [];
var string = 'blub';

var object1 = { bla: string, test: array };
var object2 = { bla: string, test: array };

document.getElementById('object-1').innerHTML = Object.hash(object1);
document.getElementById('object-2').innerHTML = Object.hash(object1);