FizzBuzz

Structured:

{ |i|
    if (i %% 3) {
        print "Fizz"
        i %% 5 && print "Buzz"
        print "\n"
    }
    elsif (i %% 5) { say "Buzz" }
    else  { say i }
} << 1..100

Declarative:

func fizzbuzz({ _ %% 15 }) { "FizzBuzz" }
func fizzbuzz({ _ %%  5 }) {     "Buzz" }
func fizzbuzz({ _ %%  3 }) {     "Fizz" }
func fizzbuzz(        n  ) {          n }

for n in (1..100) { say fizzbuzz(n) }

One-liner:

{|i|say "#{<Fizz>[i%3]}#{<Buzz>[i%5]}"||i}*100;