add(a, b)
  a + b
  
body 
   padding add(10px, 5)
   
/* default arguments */
add2(a, b = unit(a, px))
   a + b

div 
   padding add2(10px)
   
/* named parameters */
subtract(a, b)
  a - b
  
td 
   padding subtract(b:30, a:60) px
   
/* multiple return values */
   sizes()
     15px 10px
     
tr
    padding sizes()[0]
    spacing sizes()[1]

swap(a, b)
  return b a
    
a
    href: swap(target,link)
    
// condicionales
 stringish(val)
   if val is a 'string' or val is a 'ident'
     yes
   else
     no

compare(a, b)
  if a > b
    higher
  else if a < b
    lower
  else
    equal
    
/* variable functions */
add(a, b)
  a + b

sub(a, b)
  a - b

invoke(a, b, fn)
  fn(a, b)
  
body
  padding invoke(5, 10, add)
  padding invoke(5, 10, sub)


// anonymous functions
sort(list, fn = null)
  // default sort function
  if fn == null
    fn = @(a, b) {
      a > b
    }

  // bubble sort
  for $i in 1..length(list) - 1
    for $j in 0..$i - 1
      if fn(list[$j], list[$i])
        $temp = list[$i]
        list[$i] = list[$j]
        list[$j] = $temp
  return list

  sort('e' 'c' 'f' 'a' 'b' 'd')
  // => 'a' 'b' 'c' 'd' 'e' 'f'

  sort(5 3 6 1 2 4, @(a, b){
    a < b
  })
  // => 6 5 4 3 2 1
  
// hash example
get(hash, key)
  return pair[1] if pair[0] == key for pair in hash
  
hash = (one 1) (two 2) (three 3)  
get(hash, two)
// => 2

get(hash, three)
// => 3

get(hash, something)
// => null