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---
language: coffeescript
contributors:
- ["Tenor Biel", "http://github.com/L8D"]
filename: coffeescript.coffee
---
See also [the CoffeeScript website](http://coffeescript.org/), which has a complete tutorial on CoffeeScript.
``` coffeescript
# CoffeeScript is a hipster language.
# It goes with the trends of many modern languages.
# So comments are like Ruby and Python, they use hashes.
###
Block comments are like these, and they translate directly to '/ *'s and '* /'s
for the resulting JavaScript code.
You should understand most of JavaScript semantices
before continuing.
###
# Assignment:
number = 42 #=> var number = 42;
opposite = true #=> var opposite = true;
# Conditions:
number = -42 if opposite #=> if(opposite) { number = -42; }
# Functions:
square = (x) -> x * x #=> var square = function(x) { return x * x; }
# Ranges:
list = [1..5] #=> var list = [1, 2, 3, 4, 5];
# Objects:
math =
root: Math.sqrt
square: square
cube: (x) -> x * square x
#=> var math = {
# "root": Math.sqrt,
# "square": square,
# "cube": function(x) { return x * square(x); }
#}
# Splats:
race = (winner, runners...) ->
print winner, runners
# Existence:
alert "I knew it!" if elvis?
#=> if(typeof elvis !== "undefined" && elvis !== null) { alert("I knew it!"); }
# Array comprehensions:
cubes = (math.cube num for num in list) #=> ...
```
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