JSFiddle - React, Tailwind, and code Playground

JavaScript

(function() {

var Obj = function(val){
    this.field = val;
    Obj.instances.push(this);
};
Obj.instances = [];

		a = new Obj(1);
		b = new Obj(2);
    c = new Obj(3);
    
console.log( Obj.instances);  // a, b и c
})();