// declare an object with properties
let car = {
  make: 'Ford',
  model: 'GT',
  year: 2019,
  // This is a method (function) on the object
  reverse() {
    return 'Backing Up! Beep! Beep! Beep!'
  }
}

// adding or updating properties with dot notation
car.miles = 100;

// adding or updating properties with bracket notation
// if miles already exists on the object, this would change it's value
// if it doesn't this will set it as a key with a value of 150
car['miles'] = 150

// if a property doesn't exist on an object, it's considered undefined

car.owner === undefined // true

// A function contained in an object is called a method
// You can add functions to an object just like any other property

car.drive = function() {}

// You can invoke the method by accessing the function (method) on the object

car.reverse(); // 'Backing Up! Beep! Beep! Beep!'
- or -
// Though the dot notation version above is more common
car['reverse'](); // 'Backing Up! Beep! Beep! Beep!'

// Functions that return objects are called object factories
// They're a blueprint for creating a lot of objects of one type

function createCar(make, model, year) {
 // the returned object has a property called make whose value is the argument passed to the make parameter above
 // it's the same for model and year
 return {
   make: make,
   model: model,
   year: year
 }
}

createCar('Ford', 'GT', 2006); // { make: 'Ford', model: 'GT', year: 2006 }
createCar('Tesla', 'Model S', 2019); // { make: 'Tesla', model: 'Model S', year: 2019 }