Bob [Exercism - Nim]

bob.nim

import strutils, unicode

proc hey*(s: string): string =

  if s == s.toUpperAscii and contains(s, Letters.set) and s[^1] == '?': 
    return "Calm down, I know what I'm doing!"
  elif s == s.toUpperAscii and contains(s, Letters.set): 
    return "Whoa, chill out!"
  elif not contains(s, {'A'..'Z', 'a'..'z', '0'..'9', '?'}) or s == nil: 
    return "Fine. Be that way!"
  elif strutils.strip(s)[^1] == '?': 
    return "Sure."
  else: return "Whatever."