I watched a keynote talk by Martin Odersky on YouTube about why Scala. Today, the problem in computing is not in the hardware but rather the software. Since hardware developers have firmly decided that the way to go with building hardware is not to add more clock cycles but rather increase the number of cores, we as programmers must deal with more parallelism and concurrency.
Parallelism is running a problem across multiple cores, even if they're not running at the same time. However, concurrency is running multiple threads at the same time.
So why is Scala over Java in some sense? Scala is much more precise and compact. Whereas just to construct a class and its constructor with one instance variables, you need to repeat the instance variable three times, Scala only needs to do it once. Whats even more is that to make some Java program run in parallel could take days while in Scala you can just add .par and be done. Scala is actually shorthand for "scalable language."
There are also more tools to utilize in Scala to give you more control over things. This video was definitely a great motivation for me to learn Scala and functional programming from the Coursera course taught by this keynote speaker.
Resources:
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