JSFiddle - React, Tailwind, and code Playground

JavaScript

function Class() {
  var prop = '1';  
}
var obj = new Class();
console.log(obj); // =>  Class { }

 
function Class2() {
  var prop = '1';
  this.prop = function() {
    console.log(this.prop);
  }
}
var obj2 = new Class2();
console.log(obj2); // => Class { prop: [Function] }