fizz buzz nim static version

fizzbuzz.nim

type
  fbEnum = enum
    raw      = 0
    fizz     = "Fizz\n"     # 1
    buzz     = "Buzz\n"     # 2
    fizzBuzz = "FizzBuzz\n" # 3

template isFizz(i: typed): bool = i mod 3 == 0
template isBuzz(i: typed): bool = i mod 5 == 0
proc computeFizzBuzz(i: int): fbEnum =
  ((if i.isFizz(): fizz else: raw).uint8 +
   (if i.isBuzz(): buzz else: raw).uint8).fbEnum

static:
  var str = ""
  for i in 1 .. 600_000:
    str.add case computeFizzBuzz(i)
            of fizz: $fizz
            of buzz: $buzz
            of fizzBuzz: $fizzBuzz
            else: $i & "\n"

const outstr: string = str
write stdout, outstr