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Перевод Parse, don’t validate

https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-validate/

Примеры думаю имеет смысл на раст переписать, ну или любой другой стандартный яп.

Например часть про парсинг:

вместо

getConfigurationDirectories :: IO [FilePath]
getConfigurationDirectories = do
  configDirsString <- getEnv "CONFIG_DIRS"
  let configDirsList = split ',' configDirsString
  when (null configDirsList) $
    throwIO $ userError "CONFIG_DIRS cannot be empty"
  pure configDirsList

main :: IO ()
main = do
  configDirs <- getConfigurationDirectories
  case head configDirs of
    Just cacheDir -> initializeCache cacheDir
    Nothing -> error "should never happen; already checked configDirs is non-empty"

Людям скорее всего будет понятнее

fn get_configuration_directories() -> Vec<FilePath> {
  let config_dirs_string = get_env("CONFIG_DIRS");
  let configDirsList = configDirsString.split(',');
  if configDirsList.len() == 0 {
    panic!( "CONFIG_DIRS cannot be empty");
  }
  configDirsList 
}

fn main() {
  let config_dirs = get_configuration_directories();
  match (head(config_dirs)) {
    Some(cache_dir) => initialize_cache(cache_dir)
    None => panic!("should never happen; already checked configDirs is non-empty")
  };
}

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