Call an array from property 0 in property 1 JavaScript Question

Question

I am trying to learn JavaScript and came to a dead end. Version ES5.

var person = {
  cars: ["Ford", "Mercedes", "S Coupe"],
  garages: { 1: this.cars },
};

    console.log(person); 
//outputs 
//    {
//      cars: [ 'Ford', 'Mercedes', 'S Coupe' ],
//      garages: { '1': undefined }
//    }

Why is garages["1"] undefined? is it because cars is not initialized?

Answer 1

If you really want the same object to be referenced twice in obj you could do the following:

const obj=(cars=>(
 {person:{cars,garages:{1:cars}}})
)(["Ford", "Mercedes", "S Coupe"]);

console.log(JSON.stringify(obj));

Answer 2

In addition, the this in that aspect is seeing the global this.

One way to go around that is to do something like

var person = {
  cars: ["Ford", "Mercedes", "S Coupe"],
  garages: { 1: person['cars'] },
};