Answers for "object with object properties in javscript"

js object properties

var person={"first_name":"Bill","last_name":"Jenner"}
//get the person object properties with:
var keys = Object.keys(person); //keys = ["first_name","last_name"]

js create object with properties

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}