moved the coffeescript extension over from .cs to .coffee -- let's leave C# in peace. Changed array comprehensions to always return their mapped result, even when unassigned

examples/code.coffee

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+# Functions:
+square: x => x * x.
+
+sum: x, y => x + y.
+
+odd: x => x % 2 is 0.
+
+even: x => x % 2 isnt 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]
+  regex: /match[ing](every|thing|\/)/gi
+  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: []
+
+multiline: [
+  'line one'
+  'line two'
+]
+
+# Conditionals and ternaries.
+if submarine.shields_up
+  full_speed_ahead()
+  fire_torpedos()
+else if submarine.sinking
+  abandon_ship()
+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 assignment:
+good ||= evil
+wine &&= cheese
+
+# Nested property access and calls.
+((moon.turn(360))).shapes[3].move({x: 45, y: 30}).position['top'].offset('x')
+
+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, break and continue.
+while demand > supply
+  sell()
+  restock().
+
+while supply > demand then buy().
+
+while true
+  break if broken
+  continue if continuing.
+
+# 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 ("else" serves as a default).
+activity: switch day
+when "Tuesday"   then eat_breakfast()
+when "Sunday"    then go_to_church()
+when "Saturday"  then go_to_the_park()
+when "Wednesday"
+  if day is bingo_day
+    go_to_bingo()
+  else
+    eat_breakfast()
+    go_to_work()
+    eat_dinner().
+else go_to_work().
+
+# Semicolons can optionally be used instead of newlines.
+wednesday: => eat_breakfast(); go_to_work(); eat_dinner(); .
+
+# Array slice literals.
+zero_to_nine: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+three_to_six: zero_to_nine[3, 6]
+
+# Multiline strings with inner quotes.
+story: "Lorem ipsum dolor \"sit\" amet, consectetuer adipiscing elit,
+sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna
+aliquam erat volutpat. Ut wisi enim ad."
+
+# Inheritance and calling super.
+Animal: => .
+Animal.prototype.move: meters =>
+  alert(this.name + " moved " + meters + "m.").
+
+Snake: name => this.name: name.
+Snake extends Animal
+Snake.prototype.move: =>
+  alert('Slithering...')
+  super(5).
+
+Horse: name => this.name: name.
+Horse extends Animal
+Horse.prototype.move: =>
+  alert('Galloping...')
+  super(45).
+
+sam: new Snake("Sammy the Snake")
+tom: new Horse("Tommy the Horse")
+
+sam.move()
+tom.move()
+
+# Numbers.
+a_googol:   1e100
+hex:        0xff0000
+negative:   -1.0
+infinity:   Infinity
+nan:        NaN
+
+# Deleting.
+delete secret.identity