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Scala Symbol Literals


Replacing strings in case clauses

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.


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