JSFiddle - React, Tailwind, and code Playground

JavaScript

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
var triangle = {a:1, b:2, c:3};

function ColoredTriangle() {
  this.color = "red";
}

ColoredTriangle.prototype = triangle;

var obj = new ColoredTriangle();

for (var prop in obj) {
  if( obj.hasOwnProperty( prop ) ) {
    console.log("o." + prop + " = " + obj[prop]);
  } 
}

for (var prop in obj) {
  console.log("o." + prop + " = " + obj[prop]);
}