Does JavaScript Adopt Functional Programming?

var object =
  { name: "Object1",
    action: function() { },
    data: [1, 2, 3]
  }
JSON.stringify(object) ==
  "{\"name\":\"Object1\",\"data\":[1,2,3]}"

function Dog() {
  this.voice = "Woof!"
  this.makeSound = function() {
    return this.voice
  }
}
var dog = new Dog
var cat = {voice: "Prrrr",
           makeSound: dog.makeSound}
cat.makeSound() == "Prrrr"

function append(array, x) {
  return array.concat(x)
}
var a1 = [1, 2]
var a2 = append(a1, 3)
// a1 == [1, 2]; a2 == [1, 2, 3]

var array = [1, 2]
function append(x) {
  array.push(x)
}
append(3) // undefined -> no return
          // array == [1, 2, 3]

while (condition) {
  doAction()
}

do {
  action()
} while (condition)

for (var i = 0; i < size; i++) {
  use(i)
}
for (var property in object) {
  use(property)
}
for (var index of array) {
  use(index)
}

if (condition) {
  doSomething()
} else {
  doSomethingElse()
}
var a = condition ? val1 : val2

switch (response) {
  case "yes":
    return true
  case "no":
    return false
  default:
    return undefined
}

for (var i = 0; i < size; i++) {...}
for (var i in object) {...}
for (var i of array) {...}

while (cond) {...}