Scala goes out of it's way to make sure you don't need to program in a functional style. This is the main criticism of Scala from functional folks, as a matter of fact: some do not consider a language functional unless it forces the programmer to write in functional style.
Scala already introduces some nice features, comparable to some stuff that's present in C++ but not Java, though they work in different fashion. In that respect, once you realize what such features are for and relate them to C++ stuff, you'll be much ahead of Java programmers, as you'll already know what to do with them.
Some of the downsides of Scala are not related at all to the relative youth of the language. After all, Scala, has about 5 years of age, and Java was very different 5 years into its own lifespan.
In particular, because Scala does not have the backing of an enterprise which considers it a strategic priority, so the support resources for it are rather lacking. For example:
* Lack of extensive tutorials
* Inferior quality of the documentation
* Non-existing localization of documentation
* Native libraries (Scala uses Java or .Net libraries as base for their own)
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