Scala Language Symbol Literals Replacing strings in case clauses


Example

Let's say we have multiple data sources which include database, file, prompt and argumentList. Depending on chosen source we change our approach:

def loadData(dataSource: Symbol): Try[String] = dataSource match {
  case 'database => loadDatabase() // Loading data from database
  case 'file =>  loadFile() // Loading data from file
  case 'prompt => askUser() // Asking user for data
  case 'argumentList => argumentListExtract() // Accessing argument list for data
  case _ => Failure(new Exception("Unsupported data source"))
}

We could have very well used String in place of Symbol. We didn't, because none of strings's features are useful in this context.

This makes the code simpler and less error prone.