jashkenas--coffeescript/code.cs

# TODO: Add range indexing: array[5..7] => array.slice(5, 7)

# Functions:
square: x => x * x.

sum: x, y => x + y.

odd: x => x % 2 is 0.

even: x => x % 2 aint 0.

run_loop: =>
  fire_events( e => e.stopPropagation(). )
  listen()
  wait().

# Objects:
dense_object_literal: {one: 1, two: 2, three: 3}

spaced_out_multiline_object: {

  pi: 3.14159

  list: [1, 2, 3, 4]

  three: new Idea()

  inner_obj: {
    freedom: => _.freedom().
  }

}

# Arrays:
stooges : [{moe: 45}, {curly: 43}, {larry: 46}]

exponents : [x => x., x => x * x., x => x * x * x.]

empty: []

# Conditionals and ternaries.
if submarine.shields_up
  full_speed_ahead()
  fire_torpedos()
else
  run_away().

eldest: if 25 > 21 then liz else marge.

decoration: medal_of_honor if war_hero

go_to_sleep() unless coffee

# Returning early:
race: =>
  run()
  walk()
  crawl()
  if tired then return sleep().
  race().

# Conditional operators:
good ||= evil
wine &&= cheese

# Nested property access and calls.
((moon.turn(360))).shapes[3].move({x: 45, y: 30}).position

a: b: c: 5

# Embedded JavaScript.
callback(
  `function(e) { e.stop(); }`
)

# Try/Catch/Finally/Throw.
try
  all_hell_breaks_loose()
  dogs_and_cats_living_together()
  throw "up"
catch error
  print( error )
finally
  clean_up().

try all_hell_breaks_loose() catch error print(error) finally clean_up().

# While loops.
while demand > supply
  sell()
  restock().

while supply > demand then buy().

# Unary operators.
!!true

# Lexical scoping.
a: 5
change_a_and_set_b: =>
  a: 10
  b: 15.
b: 20

# Array comprehensions.
supper: food.capitalize() for food in ['toast', 'cheese', 'wine'].

drink(bottle) for bottle, i in ['soda', 'wine', 'lemonade'] if even(i).

# Switch statements.
switch day
case "Tuesday"   then eat_breakfast()
case "Sunday"    then go_to_church()
case "Saturday"  then go_to_the_park()
case "Wednesday"
  eat_breakfast()
  go_to_work()
  eat_dinner()
default go_to_work().

# Semicolons can optionally be used instead of newlines.
wednesday: => eat_breakfast(); go_to_work(); eat_dinner(); .