JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = 'one';
function fnc(){
    var getData = {};
    getData.toString = function(){
        return data;
    };
    this.out = getData;
}

var instance = new fnc();

alert(instance.out);
data = 'two';
alert(instance.out);

var s = instance.out;
alert(s);