function Person(firstName, lastName) {
  this.firstName = firstName
  this.lastName = lastName
}

const john = new Person("John", "Smith")
const jane = Person("Jane", "Air")

console.log(john)
console.log(jane)

function sum(a, b) {
  return a + b
}

console.log(sum(1, "2"))

let number = 0
console.log(number++)
console.log(++number)
console.log(number)

function getPersonInfo(one, two, three) {
  console.log(one)
  console.log(two)
  console.log(three)
}

const person = "John"
const age = 30

getPersonInfo`${person} is ${age} years old`

function checkAge(data) {
  if (data === { age: 18 }) {
    console.log("Ты взрослый!")
  } else if (data == { age: 18 }) {
    console.log("Ты по-прежнему взрослый.")
  } else {
    console.log("Хм... У тебя что, нет возраста?")
  }
}

checkAge({ age: 18 })

function getAge(...args) {
  console.log(typeof args)
}

getAge(30)