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Why do I get a [Some] Object instead of a [String] Object?
The Some object won't work as a String Parameter in a method call.
The config def returns a String so I expect the type to be String.
But when I type "Hello" Scala get's it correct.
Code
def config(s: String) = Play.current.configuration.getString(s).toString()
Logger.info(config("recaptcha.publicKey"))
Logger.info("Hello")
Output
[info] application - Some(6LeDMdASAAAAAC4CFIDY-5M7NEZ_WnO0NO9CSdtj)
[info] application - Hello
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Scala some class returns some value if the object is not null, it is the child class of option. Basically, the option is a data structure which means it can return some value or None. The option has two cases with it, None and Some.
:: - adds an element at the beginning of a list and returns a list with the added element. ::: - concatenates two lists and returns the concatenated list.
On Scala Collections there is usually :+ and +: . Both add an element to the collection. :+ appends +: prepends. A good reminder is, : is where the Collection goes. There is as well colA ++: colB to concat collections, where the : side collection determines the resulting type.
In scala, string is a combination of characters or we can say it is a sequence of characters. It is index based data structure and use linear approach to store data into memory. String is immutable in scala like java.
You are unnecessarily calling toString() on Option[String] (which Play.current.configuration.getString() returns), try this:
def config(s: String) = Play.current.configuration.getString(s).get
or maybe preferably:
Play.current.configuration.getString(s).getOrElse("some default")
getString returns an Option[String], so that it can return an empty value when there is nothing to return. When there is something to return, it returns Some(string) and you can get the inner string using the get() method.
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