gistfile1.txt

// Primitive
var message = 'hello'
var count = 42
var correct = true

// Container/Collection

// Entity (One thing, multiple attributes)
var person = {
  name: 'Zelda Fitzgerald',
  occupation: 'writer',
}
// console.log('person', person)
person.name = 'Zelda'
person.age = 29
delete person.occupation
// console.log('person 2', person)

// Dictionary (many things)
var websters = {
  aardvark: 'An animal with four legs',
  apple: 'A sweet fruit',
  apple: 'A sweet and sour fruit', // This is not recommended
  anteater: 'An animal with a long nose'
}
// console.log('websters', websters)

function getRandomAnimal() {
  var random = Math.random()
  if (random > 0.5) {
    return 'aardvark'
  } else {
    return 'anteater'
  }
}
var animal = getRandomAnimal()
delete websters[animal]
// console.log('websters 2', websters)

var countries = ['France', 'India'] // { '0': 'France, '1': 'India' }
// console.log(countries[1])

function greet() {
  console.log('Hello, how are you doing today?')
}
// greet()
// greet()
// var greeting = greet()
// console.log('greeting', greeting)

// function add (a, b) {
//   return a + b
// }
// var add = function (a, b) {
//   return a + b
// }
// var total = add(9000, 5)
// console.log('total', total)
// console.log('typeof add', typeof add)

var calculator = {
  history: [],
  add: function (a, b) {
    var complete = () => {
      var result = a + b
      this.history.push(result)
      return result
    }
    var result = complete()
    return result
  },
}

// calculator.add(4, 1)
// console.log(calculator.history)

// var countries = ['France', 'India', 'Tanzania']
// for (country of countries) {
//   console.log('country:', country)
// }
// countries.forEach((country) => {
//   console.log('COUNTRY:', country.toUpperCase())
// })
// console.log('countries', countries)

// var name = 'Zelda'

// var yell = (message) => {
//   message = message.toUpperCase()
//   console.log('message', message)
// }
// yell(name)
// console.log('name', name)

// var x = 10

// function addTen (number) {
//   x = 100
//   return number + x
// }
// var result1 = addTen(90)
// console.log('result1', result1)
// var result2 = addTen(9000)
// console.log('result2', result2)

// console.log('x', x)

// const result = (function (number) {
//   var message = 'I LOVE JAVASCRIPT'
//   console.log(message)
//   console.log('this is a number', number)
//   return number * 2
// })(42)
// console.log('result', result)

// var message = 'JAVASCRIPT'

// console.log('hello', message)

var calculator = {
  history: [],
  add: function (a, b) {
    const result = a + b
    this.history.push(result)
    return result
  }
}

const result = calculator.add(5, 10)
console.log('result', result)
console.log('history', calculator.history)

var data = { history: [] }
// calculator.add.call(data, 5, 10)
// calculator.add.apply(data, [5, 10])
var bound = calculator.add.bind(data, 5, 10)
// var bound = function () {
//   calculator.add(5, 10)
// }
bound()
bound()
console.log(data.history)