NB. Procedural programming
fizzbuzz=: monad define
  for_i. >:i.y do.
    if.     0 = 15 | i do. echo'FizzBuzz'
    elseif. 0 =  3 | i do. echo'Fizz'
    elseif. 0 =  5 | i do. echo'Buzz'
    else.                  echo i
    end.
  end.
)
NB. Loopless programming
fizzbuzz=: echo@(, ::] ('Fizz' ; 'Buzz') ;@#~ 0 = 3 5&|)@>:@i.