CoffeeScript (CS).md

CoffeeScript (CS)

• Boolean values can be true/yes/on, false/no/off

• No need to use var keyword

• No need to add semicolon for ending an statement

• Use string interpolation with double quotes.

---

js

var farm = “potatoes” + ” /“ + ”garlic” + ” /“ + “eggs”

coffeeScript

farm = “#{potatoes} / #{gralic} / #{eggs}”

---

• Use # for comments

• is is the same like == equal comparison operator

• isnt is the same like != non equal comparison operator

• In CS not isTrue is the same like !isTrue in JS

• Comparison statement with JS and CS

---

In JS
print xPos <100 and xPos< 500 
In CS
print 100 < xPos < 500 

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• print myVar ? “Hello”. If myVar is true, it will print myVar, if not it will print Hello

• Conditionals, if there is no indentation in block code, code won’t be compiled

---

If condition
	block code
else if condition (no need to use else, we can use just if)
	block code
else 
	block code

---

• In CS, print something if condition is the same as:

if condition
	print something

•  print something
  

• Arrays. We can do it vanilla js style or having elements of array in lines and indented

---

myArray = [
	elem1 (comma is not necessary, if you want to use it, go ahead)
	elem2
	elemN
] 

print myArray[1..2] # 2 dots Elem2, ElemN

print myArray[1…2] (# 3 dots) Elem2

---

• Objects

---

JS var mammals = { type: “cow”, legs: 4, color: “gray” };

CS

mammals =
	type: “cow”
	legs: 4
	color: “gray”
	
mammals = 
	cow:
		legs: 4
		color: “gay”
	dog:
		legs: 4
		color: “white”
	cat:
		legs: 4
		color: “pink”

• delete mammals.cow.color OR delete mammals[“cow”].legs

• for loop

---

for num in [1..10]
	print num

---

loop in array

car = [
	“wheels”
	“seats”
	“music”
]

for elem in car
	print elem

---

loop in object

person = 
	name: “manolo”
	age: 24 (# I wish)
	country: “the world”

for key, value of person
	print key, value

---

• Single line comments \# This is a single comment

• Multiple line comments

---

### 
This is a comment
Another comment
###

• Functions

sayHola = ->
	print “hola”

printName = (name) ->
	print name

printName “Manolo”

printVeggies = (veg1, veg2) ->
	print veg1, veg2

printVeggies “potato”, “carrot”