locase

func locase(s : String) -> String
  result := s
  for i, ch in indexed(s) | ch in {`A'..`Z'}
    result(i) := lowered(ch)
  loop
  
func lowered(ch : {`A'..`Z'}) -> {`a'..`z'}
  lower := [`a'..`z']
  return lower(index([`A'..`Z'], ch))

Returns a copy of s with all upper case characters converted to lower case.

See also: upcase