livescript in a nutshell

ls.ls

# declarative code
function add1 n => n + 1
function mul2 n => n * 2

# pipes
alert(
  1
  |> add1
  |> mul2
)

# ...rest in the beginning
function doStuff (...args, cb)
  [a, b, ...stuff] = args
  cb void, a + b, stuff

# pattern matching
match 1
| isNaN     => "not a number"
| isFinite  => "not infinity"
| otherwise => "something else"

# implicit first arg `it`, implicit switch-case as function body
matchNumbers = ->
  | it is 0 => "zero"
  | it is 1 => "one"
  | it > 1  => "greater"
  | _       => "smaller"

# backcalls against async madness
<- setTimeout _, 2000
alert '2 Seconds later'

<- setTimeout _, 1000
alert '3 Seconds later'