passing-by-value-and-by-reference.md

Passing by value and by reference

What is the output?

var myObject = {
  price: 20.99,
  get_price: function () {
    return this.price
  },
}
var customObject = Object.create(myObject)
customObject.price = 19.99
delete customObject.price
console.log(customObject.get_price())

---

What is the output?

;(function (a) {
  arguments[0] = 10
  return a
})(5)

---

What is the output?

function Car(color) {
  this.color = color
}
var lada = new Car("Black")
Car.prototype.currentGear = 1
console.log(++lada.currentGear)
console.log(Car.prototype.currentGear)

---

What is the output?

var User = function () {}
User.prototype.attributes = {
  isAdmin: false,
}
var admin = new User("Sam"),
  guest = new User("Bob")
admin.attributes.isAdmin = true
alert(admin.attributes.isAdmin)
alert(guest.attributes.isAdmin)

---

What is the output?

var obj = {
  a: 1,
}
;(function (obj) {
  obj = {
    a: 2,
  }
})(obj)
console.log(obj.a)

---

What is the value of foo.x?

var foo = { n: 1 }
var bar = foo
foo.x = foo = { n: 2 }

---

how to return result for async operation in sync style? like .getData() - should return data synchroniously, but data get in async by ajax. let's discuss workarounds

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About prototype inheritance / passing by reference - What is the output?

function Person(name) {
  if (name) this.options.name = name
}
Person.prototype.options = {
  name: "Default name",
}
var foo = new Person("foo")
var bar = new Person("bar")
console.log(foo.options.name)
console.log(bar.options.name)

---

what would be the output ?

var a = {}
;(function b(a) {
  a.a = 10
  a = null
})(a)
console.log(a)