JSFiddle - React, Tailwind, and code Playground

JavaScript

function test() {

  if (!(this instanceof test)) {
  	return new test();
  }

  var a = 100;
  this.get = function get() {
    return a;
  }
  this.set = function set(v) {
    a = v;
  }
}

q = test();
console.log(q.get());
q.set(10);
console.log(q.get());