Demo for Coffeescript presentation

demo.coffee

# String interpolation
result = "The result is #{3}"
console.log result

movieId = 452
url = "http://movies/#{movieId}"
console.log url

# Functions
square = (x) -> x * x
console.log "The square of 2 is #{square(2)}"

getMovieUrl = (movie, showReviews) -> "http://movies/#{movie}?#{showReviews}"
console.log "To get the movie with id #{1} the url is #{getMovieUrl 1, false}"

# Functions II
getMovieUrl = (id, baseUrl = '/movies') ->
  "#{baseUrl}/#{id}"
  
console.log "The url for movie 1 is #{getMovieUrl 1}"

# Objects
config =
  local:
    user: 'dev'
    pwd:  'dev123'
  remote:
    user: 'superdev'
    pwd:  "impossibleToGuess"
    
console.log "For the config local we have #{config.local.user} and #{config.local['pwd']}"

# Maps and arrays
deploy = ['local', 'remote', 'uat']
fib = [1, 2, 3, 5, 8, 13, 21]

console.log "We choose to deploy on #{deploy[0]}"

first = fib[0..3]
console.log "First 3 Fibonnaci: #{first}"

noLast = fib[0..-2]
console.log "Everything but the last: #{noLast}"

# Destructuring assignment
[firstName, nick, lastName] = ['D\'Arcy', 'Baconator', 'Lussier']

console.log "Had a great time with #{firstName} '#{nick}' #{lastName}"

reviews = [45, 29, 21, 10, 8, 4]

[best, secondBest, theRest...] = reviews

console.log "Best review #{best}"
console.log "Second best review #{secondBest}"
console.log "All the rest #{theRest}" 

# if
isJson = true
callIndex = -> console.log 'Index called!'
showMessage = -> console.log 'The request is not JSON....'

if isJson
  callIndex()
else
  showMessage()

# Unless
unless isJson
  showMessage()

# Modifiers
showMessage() unless isJson
callIndex() if isJson  

# Switch

critics =
  Darcy: "D'Arcy Lussier"
  Jay: 'Jay Sherman'
  
movieReview = (critic, movie) -> 
  switch critic
    when 'Jay'
      'It Stinks!'
    when 'Darcy' 
      if movie.match(/Bacon/) then 'Awesome!' else 'It needs more Bacon!'
    else 
      throw new Error('Invalid critic name!')
      
console.log "Canadian Bacon -> #{critics.Darcy}: #{movieReview 'Darcy', 'Canadian Bacon'}"
console.log "Canadian Bacon -> #{critics.Jay}: #{movieReview 'Jay', 'Canadian Bacon'}"

# Comprehension
negativeNumbers = (-num for num in [1, 2, 3, 4])

console.log negativeNumbers

evens = (x for x in [2..10] by 2) 

isInteger = (num) -> num is Math.round(num)
numsThatDivide960 = (num for num in [1..960] when isInteger(960 / num))

console.log numsThatDivide960

deploy = (env) -> console.log "Application deployed to #{env}"

deploy env for env in ['local', 'uat', 'prod']      

# Existential Operator
question = paragraph? and not createdDate?
defaultValue = null
defaultValue ?= 5

console.log "Default value #{defaultValue}"
console.log "The question is: #{question}"

currentUser = -> null

console.log "The current user: #{currentUser()?.name}"
console.log "The actual user: #{actualUser?().name}"

# Classes
ajaxCaller = (options) ->
  console.log "Calling the URL #{options.url}"
  options.success "<h1>Movie form created!</h1>"
  
class MovieRepository
 
  constructor: (@baseUrl) ->
    
  newMovie: ->
    ajaxCaller
      url: "#{@baseUrl}/movies/create"
      success: (data) -> console.log "Result data of calling: #{data}"

new MovieRepository("http://movies").newMovie()

# Inheritance
class Shape 
  constructor: (@width) -> 

class Square extends Shape 
  computeArea: -> Math.pow @width, 2

class Circle extends Shape 
  radius: -> @width / 2 
  computeArea: -> Math.PI * Math.pow @radius(), 2

showArea = (shape) -> 
  console.log shape.computeArea()

showArea new Square(2) # 4 
showArea new Circle(2) # pi