when do you use Object.defineProperty()

Question

I\'m wondering when I should use

Object.defineProperty

to create new properties for an object. I\'m aware that I\'m able to set things lik

Answer 1

@Gerard Simpson

If 'area' should be enumerable it can be written without Object.defineProperty, too.

var myObj = {
    get area() { return this.width * this.height }
};

myObj.width = 20;
myObj.height = 20;

for (var key in myObj) {
  if (myObj.hasOwnProperty(key)) {
    console.log(key + " -> " + myObj[key]);
  }
}

//area -> 400, width -> 20, height -> 20