[microtonal]

It 'looks just like Scala'? It is not even a functional programming language. Let alone that it supports implicits, general operator overloading (operator overloading is very limited in Kotlin), existential types, etc.

In fact Kotlin looks mostly like Java with some additions to make everyone's lives easier (closures, extension methods, data classes).

[pron]

Kotlin is certainly in the "Java philosophy" camp (alongside Go, Dart), and yet achieves most if not all of Scala's original goals (though, unlike Scala, it is not a superset of Haskell, Lisp, Javascript and Java, so if you want to write Lisp, Haskell and Javascript, and insist on having all three compiled by the same compiler, you should stick with Scala :)). I have high hopes for Kotlin, and can certainly see my future projects being written in a combination of Kotlin and Clojure.

[kenbot]

A superset of ... what the? Why do you keep trotting out this garbage thread after thread?

Every language takes influences from others, if that's what you meant. Scala is influenced by Java, C# and Haskell, in that order. Kotlin is influenced by Scala and Java, etc.

The "superset" and "Lisp, Haskell and Javascript in the same compiler" comments are unhinged from the reality of any language I recognise.

[joostdevries]

I think I read that phrase from you before on nyc. I think it's a misleading catchprase.

For me and I think most other Scala devs Scala is a statically typed FP-OO language. So Haskell doesn't do it justice because Haskells insistence on purity makes it impractical for me in getting stuff done. And Java doesn't do it justice because Java is held back by its history. "Superset of" makes it sounds like a weakness and overwrought. In my experience it offers a sweat spot of the best features of static FP and OO.

So what about your mention of Lisp and Javascript? Unless you're deep in some framework you don't need to know about the support for macros and structural typing. I've ignored those two so far because I haven't needed them (yet?). And I haven't felt they were in my way.

So where you say "a superset of Haskell, Lisp, Javascript and Java" I say "the sweet spot of the best features of static FP and OO for the real world. Leveraging the JVM ecosystem".

[asdasf]

>So Haskell doesn't do it justice because Haskells insistence on purity makes it impractical for me in getting stuff done

I know this will sound snarky, but I have to ask: have you tried haskell before? I only ever hear that line of reasoning from people who have never used it (and I was once one of them, using that very same reasoning to choose a multi-paradigm language). We bailed on scala for haskell precisely because it is pure and has a better type system.

[joostdevries]

"Useful for getting stuff done" is a point that Erik Meijer literally has made. F.i. you find him explaining his point of view on side effects and imperative programming here. And how he progressed from "fundamentalist" functional programming to "the real world is imperative & embrace side effects". http://youtu.be/a-RAltgH8tw?t=11m1s

You can't say that Erik Meijer doesn't know Haskell. :-)

[codygman]

The fact that Erik Meijer says that imperative programming is the way to go for the "real world" is deserving of attention, but it doesn't empirically mean "all 'real world' software is better created with the imperative paradigm".

From the sound of it this is his first job in the "real world"? If that's the case, perhaps he just hasn't seen patterns of applying his current functional knowledge in a way thats better than the best practices from the imperative realm.

How do we know after a few years he won't switch (provided he was a fundamentalist functional programmer) back to saying "now that I have a better understanding of 'The real world' I can see patterns applied with the functional paradigm are better than the best practices I've been using from the imperative paradigm."?

I believe this is the reason to keep an ear open for authority figures, but not to take everything they say empirically, especially when it's in contradiction with a position they've held much longer.

Apologies for the rambling, I was just typing out what came to mind.

[dragonwriter]

> The fact that Erik Meijer says that imperative programming is the way to go for the "real world" is deserving of attention, but it doesn't empirically mean "all 'real world' software is better created with the imperative paradigm".

Nor is that even, I think, what I think Meijer favors. Meijir's position, from what I've seen from him in various contexts, seems to be that there are cases in real world software where the most clear expression of intent uses imperative constructs, and its better to use them -- but understand and contain their dangers -- in those cases rather than trying to avoid out of devotion to purity.

> From the sound of it this is his first job in the "real world"?

Well, if you don't count the 13 or so years at Microsoft as being "real world".I don't think he ever was a fundamentalist anything.

> I believe this is the reason to keep an ear open for authority figures, but not to take everything they say empirically

"Empirically"? Are you meaning something like "uncritically"? Because "empirically" doesn't have any meaning that makes sense in this sentence.

[asdasf]

>You can't say that Erik Meijer doesn't know Haskell

That's true. But I can say that he is quite happy to tailor his message to his audience, If you listen to what he is saying, he is making the argument for haskell. He is just wording it for the PHP crowd. Haskell does allow side effects, which is entirely the point. But the "unwashed masses" as it were are under the misconception that it does not. So he has to take the "side effects are awesome" sales pitch, and kinda tosses haskell under the bus in the process. Unfortunate, and ironic given that haskell programmers genuinely feel that side effects are awesome, but what can you do?

[asdasf]

>though, unlike Scala, it is not a superset of Haskell, Lisp, Javascript and Java

If you think scala is a superset of those, then you either really don't know scala at all, or you have an incredibly low opinion of all the languages you listed.

[pkolaczk]

It managed to copy almost every single Scala feature and is not even functional? Impressive.