app.js

function Person(firstName, lastName, hairColor, heightInCm, favouriteAnimal = 'dog') {
  this.firstName = firstName
  this.lastName = lastName
  this.hairColor = hairColor
  this.heightInCm = heightInCm
  this.heightInInches = function() {
    return this.heightInCm / 2.54
  }
  this.pets = []
  this.favouriteAnimal = favouriteAnimal
}

const martin = new Person('Martin', 'Laws', 'brown', 188)

function Pet(name, species, age, favouriteChewToy) {
  this.name = name
  this.species = species
  this.age = age
  this.favouriteChewToy = favouriteChewToy
  this.bark = function() {
    console.log(`woof woof I am ${this.name}`)
  }
}

var maya = new Pet('Maya', 'dog', 4.5, 'pig')
var apples = new Pet('Apples', 'turtle', 33, 'fruit')

martin.pets.push(maya, apples)

console.log(martin)
martin.pets[0].bark()
martin.pets[1].bark()

objects.js

var name = 'Martin'
var number = 123
var alsoNumber = 3.14159
var notANumber = NaN
var boolean = true
var array = []
var notAThing = null
var nothingHere

var person = {
  id: 1,
  firstName: 'Martin',
  lastName: 'Laws',
  fullName() {
    return `This user's full name is: ${this.firstName} ${this.lastName}`
  },
  heightInCm: 188,
  heightInInches() {
    return this.heightInCm / 2.54
  },
  favouriteColours: ['blue', 'teal', 'grey'],
  isBusy: true,
  friends: [],
  addFriend(newFriendName) {
    if (typeof newFriendName === 'string' && !this.friends.find(friend => friend === newFriendName)) {
      this.friends.push(newFriendName)
    }
  }
}

console.log(person)

person.addFriend('Scott')
person.addFriend('Scott') // this is ignored because we are checking for duplicates in addFriend()
person.addFriend(false)
person.addFriend(123)
person.addFriend(undefined)

console.log(person)

pets.js

function Pet(name, owner, species) {
  this.name = name
  this.owner = owner
  this.species = species
  this.birthday = Date.now()
  this.speak = function() {
    if (this.species === 'dog') {
      console.log('bark bark')
    } else if (this.species === 'cat') {
      console.log('meow')
    } else {
      console.log('I think there has been a misunderstanding')
    }
  }
}

var pets = []

function createPet(name, owner, species = 'dog') {
  var newPet = new Pet(name, owner, species)
  
  pets.push(newPet)
}

createPet('Hugo', 'Andy')
createPet('Maya', 'Martin')
createPet('Obie', 'Martin', 'cat')
createPet('Martin', 'Danielle', 'human')


console.table(pets)

pets[0].speak()
pets[2].speak()
pets[3].speak()

simple.js

const martin = {
  firstName: 'Martin',
  heightInCm: 188
}
Object.freeze(martin)

martin.firstName = 'Horatio'
martin.favouriteAnimal = 'dog'

console.log(martin)

let example = 'outside test'

{
  let example = 'inside test'
  console.log(example)
}

console.log(example)