Coffeescript to Javascript

coffeescript-to-javascript

1. Conditionals & Operators
coffeescript              			Javascript
------------            			-------------
  == is                    			===
  != isnt                   			!==
  not                       			!
  and                       			&&
  or                        			||
  true yes on               			true
  false no off              			false
  
  if age < 18                			if (age < 18) { alert("Under age") }
     alert "Under age"           		   
  alert "under age" if age < 18       
  
  if newLevel?                   if (typeof newLevel !== "undefined" && newLevel !== null){
    checkLevel(newLevel)           checkLevel(newLevel);
  else                           } else {
    resetLevel                     resetLevel();
                                 }

  
COFFEESCRIPT
---------------
check if a function exists before calling it
==> funct?()

Ranges
------
range = [1..4]    inclusive       var range = [1,2,3,4]
range = [1...4]   not inclusive   var range = [1,2,3]

Variables & Subsets
----------------
start = 5
end = 10
range = [start..end]

range[1..4]

range[1...range.length]   :- returns all the elements in the list
range[1..-1]              :- -1 means very last item 

List
---------
storeLocations = [
  'Orlando'
  'Winter Park'
  'Sanford'
]

for location in storeLocations
  alert "Location #{location}"

OR

alert "Location #{location}" for location in storeLocations
  
changing the original list comprehension to have FL added
storeLocations = ("#{loc}, FL" for loc in storeLocations)

geoLocate(loc) for loc in storeLocations when loc isnt 'Sanford'
#create a new Array without Sanford
storeLocations = (loc for loc in storeLocations when loc isnt 'Sanford')

#Splats () - for a variable number of arguments
searchLocations = (brand, cities...) ->
  "#{brand} exists in #{cities.join(',')}"

#Objects - hash 
coffee = {name: "French", strength: 1}
OR
coffee = 
  name: "French"
  strength: 1
  brew: -> alert("brewing #{@name}")
  pour: (amount=1) ->
        if amount is 1
          "Poured a single cup"
        else
          "Poured #{amount} cups"
         
Coffee Classes (Constructors and Properties)
------------------------------------------------
class Coffee
  constructor: (@name, @strength=1) ->
  
  brew: -> alert "brewing #{@name}"
  pour: (amount=1) ->
    if amount is 1
      "Poured a single cup"
    else
      "Poured #{name} cups"

#calling the coffee object
french = new Coffee("Indian", 2)
french.brew()


#Inheritance
class IndianCoffee extends Coffee
  constructor: (@name, @strength=0) ->
    @brand = "Nescafe"
    
#new coffee
ice_coffee = new IndianCoffee("Indian")
ice_coffee.brew()

#when you need the reference "this" for incrementing the class parameters
please use the "=>" instead of "->" in the function definition of a class.