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7666 :: 'ord' cannot be passed to a procvar

• oyster (orginal) [2021-03-20T11:19:56+01:00] view original

  
  import strutils
  import sequtils
  import sugar
  
  echo "A".toLower
  echo ["A", "B", "C", "D"].map(x => toLower(x))
  echo ["A", "B", "C", "D"].map(toLower)
  Run

  works fine

  however, the last line of

  
  echo 'A'.ord
  echo ['A', 'B', 'C', 'D'].map(x => ord(x))
  echo ['A', 'B', 'C', 'D'].map(ord)
  
  Run

  says

  
  R:\WHY.NIM(12, 31) Error: 'ord' cannot be passed to a procvar
  Run

  so what makes this difference? Thanks

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• Stefan_Salewski (orginal) [2021-03-20T11:48:27+01:00] view original

  toLower() is an ordinary function, you should find it somewhere in the Nim source codes. ord() is not, it is more like a cast. 'A' is called a char in Nim, but what it really is is a 8bit int which can be used to make strings. So 'A'.ord tells: Let us regard the entity as an int. Ord is generally a NOP, no real action taken, no CPU cycles used.

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• lscrd (orginal) [2021-03-20T12:17:43+01:00] view original

  And you can do instead:

  echo ['A', 'B', 'C', 'D'].mapIt(ord(it))
  Run

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