Scala Versus Java

Java is no longer alone on the JVM. It now has to share space with its younger siblings JRuby, Jython, Groovy, Clojure, Scala and many others. Each new language has its own set of advantages and disadvantages compared to Java, and its own niche in which it performs best, but Scala in particular is gaining momentum.

In this presentation to San Francisco Java User Group on January 18, 2012, Marakana's own Dan Rosen introduces Scala to Java developers and shows off some of its expressive power -- higher-order functions, type inference, and pattern matching -- by building a simple web service. You'll never look at Java the same way.

[MINDoSOFT]

Excellent video, especially the code samples are exactly to the point.

Magnificent work, Dan Rosen.

I will surely watch your other video about Monads.

Scala rules!

[wessidestory]

C# is object oriented, so while you can do most of this in it, it's organized differently. In OO programming, it's easy to make objects, hard to make functions (which aren't tied in some way to a specific object). In functional programming, it's hard to make objects but easy to make functions. Scala, being functional, makes it easy to keep your program modular; however, Scala also allows you to represent objects easily as well. It puts a lot of tools in your kit.

[jimtoxford]

Superb video. I think I'll rewatch!
Love Scala, it's just great.

[wjblazkowicz]

Regarding the optimization of synchronized in JVM (0:30:00). It does only optimize single threaded access to a synchronized method. So it still stays slow in a multithreaded environment.

[chrimony]

The no-spin quote from Yammer:

"Right now at Yammer we're moving our basic infrastructure stack over to Java, and keeping Scala support around in the form of façades and legacy libraries. [..] The essence of it is that the friction and complexity that comes with using Scala instead of Java isn't offset by enough productivity benefit or reduction of maintenance burden for it to make sense as our default language."

[AetherElemental]

The 1 to 10 List example is NOT tail recursive as claimed

[Aabil]

34:30 I just tried this in Intellij with Scala 2.13 and I annotated that function with @tailrec and it failed to compile.

[cbeers]

I'm looking for experienced Scala Senior Developers in the Toronto area. Wouldn't usually advertise on YouTube but finding it very tricky to find this very specific skill set. It's a great opportunity so drop me a line
Thanks,
Chris

[jinilover]

my confession - since i learnt java, there is never any prog. lang. raise my interest or make me try to love it until i heard of scala last year, now i got to say, i don't want to program java any more. imho, although project lambda incorporates fp features, but java's foundation wasn't functional in day 1, while scala is rooted as both oo and functional

[Desher]

doesn't C# have all this and more? (just a noob question).

[OverG]

If there is anything I hate when it comes to talks like these, those are presentations with code written on. Start your freaking notebook, open a freaking editor/IDE and start showing people freaking capabilites of Scala on freaking live example!

[uploadvoice]

*Hello, Good video But at **34:40** the guy is wrong his fonction is not tail recursive*

Correct way :

def listToTen(i:Int): List[Int] = {

def listToTenUtil(i:Int, acc:List[Int] = List.empty): List[Int] = {

if(i == 10 ) acc
else
listToTenUtil(i+1, i :: acc)

}

listToTenUtil(1)

[NadavBenedek]

Tiny mistake at 28:48

It should be private static Bar bar

[dcsobral]

That "tail recursion" is not a tail recursion, since the result of the recursion is a parameter to cons.

[thegrinch]

Scala is like a janitor for the mess Java code makes, but sometimes you could have important papers and important things that get cleaned up by the "janitor." Therefore, Scala is an abstraction to Java.

Foo, Bar, Baz should be banned from the exemple world !! =)
even in the simplest ones

[rain_deer]

Remember when clojure were in java 7? cross your fingers is all I'm saying

[yanivtalmusic]

Absolutely stellar lecture. Thanks a million!

[proyb]

Oh, that too bad. So why do you even need to comment when you don't even use Scala just as you don't use C/C++, .Net, etc?

[Diggerb]

i feel sorry for the guy doing the presentation. the audience is so crap!