Functional syntax


 function declaration
 f(x) = x + 1
 f := x -> x + 1     (anonymous function)

 fact(x) = if x == 0 then 1 else x * fact(x - 1)
 fact =
     0 -> 1
     x -> x * fact(x - 1)

 anonymous functions
 array.each_with_index(e, i -> "#{i} {e}".println)
 palindromes = words.filter(s -> s == s.reverse)

 partial application
 f(,1)    is equivalent to     x -> f(x,1)
 f(1,)    is equivalent to     x -> f(1,x)
 [ 1, 0.2, 3.11 ].each(printf("%.2f euros\n",))