CoffeeScript-Comparison.js

// A nicer comparison of CoffeeScript syntax compared to manual ECMAScript Harmony style syntax

// Assignment:
let number = 42,
    opposite = true

// Conditions:
if (opposite) number = -42

// Functions:
let square = function(x) x * x

// Arrays:
let list = [1, 2, 3, 4, 5]

// Objects:
let math = {
    root: Math.sqrt,
    square: square,
    cube: function(x) x * square(x)
}

// Splats:
let race = function(winner, ...runners) print(winner, runners)

// Existence:
if (elvis != null) alert("I knew it!")

// Array comprehensions:
let cubes = list.map(math.cube)

CoffeeScript-Original.coffee

# Sample CoffeeScript from the CoffeeScript front page http://jashkenas.github.com/coffee-script/

# Assignment:
number   = 42
opposite = true

# Conditions:
number = -42 if opposite

# Functions:
square = (x) -> x * x

# Arrays:
list = [1, 2, 3, 4, 5]

# Objects:
math =
  root:   Math.sqrt
  square: square
  cube:   (x) -> x * square x

# Splats:
race = (winner, runners...) ->
  print winner, runners

# Existence:
alert "I knew it!" if elvis?

# Array comprehensions:
cubes = math.cube num for num in list

Wow, I like ECMAScript syntax way better.