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5858 :: Code golfing in Nim

• Yardanico (orginal) [2020-01-25T19:36:55+01:00] view original

  So in https://forum.nim-lang.org/t/5855 @juancarlospaco shared a website https://code-golf.io

  It's a website for competitive code golfing and it supports Nim!

  So if someone considers it fun and has free time, we can try making new solutions, and, only if you want to, share the solutions (CodeGolf doesn't allow you to see other people's solutions) or the tricks for making Nim code smaller here.

  Some tricks:

  • I've learned it from https://forum.nim-lang.org/t/5855#36306, but you can use a%%b instead of a mod b, %% is actually different from mod (it should be used for unsigned ints only, but it works if both arguments are positive)
  • <1 is shorter than ==0 if you don't care about negative
  • You don't need spaces around .. or ..< in for a in 0..<5
  • You don't need to specify first argument in case of using .. - for x in ..4 - https://nim-lang.org/docs/system.html#..%2CT
  • You can replace indentation with `;` and parentheses (although be aware that in some cases it doesn't reduce save char count) , for example:

  Before:

  proc a(x:int):int=
   result=5
   if x>5:
    if x<3:
     if x==0:
      echo x
      echo x-1
   elif x==0:
    echo 0
    echo 5
   else:return 5
  Run

  After:

  proc b(x:int):int=(result=5;(if x>5:(if x<3:(if x==0:(echo x;echo x-1)))elif x==0:(echo 0;echo 5) else:return 5))
  Run

  15 characters less

  And of course, don't follow these tips in your real projects

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• Yardanico (orginal) [2020-01-25T19:53:06+01:00] view original

  Some examples:

  Leap years from 1801 to 2400:

  import times
  for x in 1801..2400:
   if x.isleapyear:echo x
  Run

  Without stdlib -

  for x in 1801..2400:
   if x%%(if x%%25>0:4 else:16)<1:echo x
  Run

  Fibonacci of numbers from 0 to 30:

  for i in ..30:echo (var(a,b)=(0, 1);(for x in 0..<i:(a,b)=(b,a+b));a)
  Run

  Or, by SolitudeSF:

  var(a,b)=(0,1)
  for _ in ..30:echo a;(a,b)=(b+a,a)
  Run

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• juancarlospaco (orginal) [2020-01-26T18:22:13+01:00] view original

  Person on Top of ranking should be emitting C++ or something... 🤔

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• mratsim (orginal) [2020-01-27T15:26:10+01:00] view original

  You can replace indentation with ; and parentheses

  Now we can just admit that Nim is a syntax skin over Lisp

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