Probably because

someFun() {}

is legal syntax, and it’s not splitting your statement based on newlines. So the compiler is really parsing that chunk of code like:

println("a", { println("b") }())

which isn’t legal I suspect.

@eshioji not answering your question, but if you want put some code in a lambda and execute it immediately, you're better off with

run { println("b") }

because it gets inlined

I think I understand the immediate cause, but now, I’m curious to find out what the motivation was. Both of these compile, and the IDE says I can remove the

()

from the second line, but naively one would think this shouldn’t compile…

someFun2

makes perfect sense to me, but the way

someFun

can be invoked looks “wrong” to me (

someFun({ println("b")})

would be “correct” in my eyes)

it's just the language grammar. if the last parameter is a function type, you can put the lambda outside the parantheses. if the only parameter is a function type, you can omit the parantheses

but you don't have to do both

heh

Thank you! Didn’t know there were such a rule…

In Kotlin, there is a convention that if the last parameter to a function is a function, and you're passing a lambda expression as the corresponding argument, you can specify it outside of parentheses

Note that the parentheses in a call can be omitted entirely if the lambda is the only argument to that call

duh

sorry will rtfm next time 😜

@eshioji And if you are wondering about the motivation for such syntax, I think it was inspired by Groovy. The biggest advantage is that it lets you build really nice DSLs and makes extending the language easy and more usable. For exapmle it is really easy to implement something like the

withResource

extension function which looks almost like a dedicated keyword from the use site.

@rs3vans has left the channel

Thanks @poohbar , I was really curious about that. To be completely honest I’m not liking it at the moment (nice looking DSL looks nice, but are they really helping?), but maybe I’ll grow to like it!

Hi, for some reasons my Android Studio refuses to fetch sources jar for kotlin stdlib 1.1.2-5

1.1.2-4 and previous versions work fine

did anyone else had similar problems recently?

hmm, actually it seems that the problem might be related to gradle bump from 3.3 to 4.0

for anyone interested:

bug report ping-pong between google and gradle 😞

hello all, I'm new to Kotlin, I've been meaning to substitute Groovy by Kotlin on my project. However I have to deal with xml loosely defined and therefore Groovy XmlSlurper is perfect. I've been trying to find a suitable alternative in Kotlin but haven't found any. Any recommendation? Thank you!

I'm not familiar with XmlSlurper, but is there a compiled version of that available as a jar from Maven? Just use that!

You SHOULD be able to use any lib that is built to the jvm from Kotlin -- regardless of what language it was written in.

Hey. I am new here and want to start with two questions. 1) How is Kotlin superior or more worth learning than C#? 2) What are the best intros to Kotlin?

Your first question is unlikely to be answered in a useful way, but your second question is easy. Read the docs (really, they are incredibly well structured and helpful), then see what you need from there and ask further. Both https://kotlin.link/ and https://superkotlin.com/resources-learn-kotlin/ will be helpful.

1) How is Kotlin superior or more worth learning than C#?

Learn both and have your say 🙂

It's not. Or it might be not. Depending where you are located at and what you do. The JVM is in general more "interesting" (and ...) than .NET ...so that can be a start...I guess 🙂

both are worth learning if you plan to work on the JVM and .NET.