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If you want to learn kotlin go to the official docs and tutorial, they are as good as the language:
http://kotlinlang.org/docs/reference/
And you don't need to install anything as you can try it in the browser:
Does Kotlin have algebraic types? Possibly via sealed traits or the like, similar to Scala?
Does it have an equivalent to Swifts if let clause? if let person = selection?.organization?.owner { setTitle(person.name) setImage(person.image) }
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Deservedly so. It is a great language, and it's backed by the ultra-power JVM. You can use a hipster language with great features and still use JodaTime and maven and all the enterprise stuff that just works.
What exactly make it a great language? What are the advantages compared to Java? I search for it but couldn't find any simple answer to that question. The fact that things are shorter to declare doesn't make it better. It makes it less readable.
That's not a hard and fast rule. There are obvious inflection points. A 200 character long identifier is less readable than a 20 character identifier in almost all cases. A 1 character identifier is less readable than a 8 character identifier in almost all cases. Somehwhere between those extremes is the sweet spot, and it's likely somwhat different depending on person.
As for language keywords, as long as they are unique, unambiguous, and not likely to conflict with written code often, shorter is likely better since it's purely a matter of learning them when learning the language. Given those constraints, it's easy to see it's possible to be too short though (any single character keyword that is not context sensitive is likely a horrible choice).
Does it have an equivalent to Swifts if let clause? if let person = selection?.organization?.owner { setTitle(person.name) setImage(person.image) }
Yes. val person = selection?.organization?.owner?.let { setTitle(it.name) setImage(it.image) it }
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Somehow that seems even less readable to me.
This is simply "parentheses in a call can be omitted entirely if the lambda is the only argument to that call." This one feature allows for type safe DSL's which eases GUI construction on Android and other domains. https://github.com/Kotlin/anko/wiki/Anko-Layouts Its also used for chaining stream code which takes in functions. You get used to this feature very quickly.
I like kotlin a lot, but suddenly there are a lot of articles in the front page about it. Kotlin isn't more cool because Google announced yesterday it is going to use it in Android. Kotlin is the same good language it was 2 days ago! (rant over) If you want to learn kotlin go to the official docs and tutorial, they are as good as the language: http://kotlinlang.org/docs/reference/ And you don't need to install anythi…
Earlier quoted context omitted.
What exactly make it a great language? What are the advantages compared to Java? I search for it but couldn't find any simple answer to that question. The fact that things are shorter to declare doesn't make it better. It makes it less readable.
I haven't used Kotlin, but glancing over their comparison page the one that jumped out to me was that it (almost) eliminates the possibility of null pointer exceptions: https://kotlinlang.org/docs/reference/null-safety.html
I like kotlin a lot, but suddenly there are a lot of articles in the front page about it. Kotlin isn't more cool because Google announced yesterday it is going to use it in Android. Kotlin is the same good language it was 2 days ago! (rant over) If you want to learn kotlin go to the official docs and tutorial, they are as good as the language: http://kotlinlang.org/docs/reference/ And you don't need to install anythi…