Mirror of forum.nim-lang.org

4951 :: test for nil

• MerryMurray (orginal) [2019-06-20T03:23:26+02:00] view original

  Hi

  I'm using docopt and have an empty argument that is nil. echo args["--wid"] gives nil args["--wid"] == nil gives a compile time error

  thanks

---

• leorize (orginal) [2019-06-20T10:42:23+02:00] view original

  Yea, that part is rather misleading, but it's due to how docopt convert that to string. Looks the the correct way to check for that is:

  if args["--wid"].kind == vkNone
  Run

  or

  if not args["--wid"] # vkNone values are converted to false implicitly
  Run

---

• MerryMurray (orginal) [2019-06-20T12:51:13+02:00] view original

  Solved. Great. Works. Thank you.

  Just starting nim. Enjoying myself.

---