Ooo, really?? 😄

see https://github.com/Kotlin/KEEP/issues/5 for a lengthy discussion why the syntax is chosen

and https://youtrack.jetbrains.com/issue/KT-15667 for the shorter syntax issue

Ok, but as far as I understand, the

::

will stay anyway?

yes

In Swift if I do:

class A {
    var b = B()
}

class B {
    var value = 5
}

let a: A? = A()

let foo = a?.b.value // I don't have to put ? after b and whole expression has Int type

In Kotlin I would have to do

val foo = a?.b?.value

and the whole expression would be an

Int?

. Is any of these approaches better? And why if so?

If a is null, what is foo’s value in Swift?

Huh weird, if I specify the type like:

let foo: Int = a?.b.value

then it shows an error which makes sense, but if I let it infer the type then it works and if I set

a

to

nil

then

foo

is null which would suggest that it’s actually an

Int?

but IDE shows me

Int

. I guess it’s an IDE bug.

let a: A? = A()

let foo = a?.b.value

foo is Int // prints true for Int and for Int?

but

let a: A? = nil

let foo = a?.b.value

foo is Int? // prints true only for Int?

Just started to play with Swift, I thought it behaves a bit different from Kotlin. I’ll experiment more 🙂

So some languages that have

?.

short circuit when the value is null (C#), which makes variable assignment awkward (as well as some other things). If you do variable assignment then you want

?.

to return null so afterwards, which is why Kotlin handles it the way it does. I wasn’t sure which way Swift handled it which is why I asked.

Maybe swift compiler is smart enough that it sees that a is not null so the type will be Int at the end.

It's possible to get some sort of base path of the project and then look for the package and his files?

Anyone know of a "complete" coding standards doc for Kotlin? Looking for something more comprehensive than: http://kotlinlang.org/docs/reference/coding-conventions.html

I basically use whatever

Ctrl + Alt + L

gives me 🙂

anything that should be potentially added to the coding-conventions official page is being discussed here: https://github.com/yole/kotlin-style-guide/issues

I'm pretty sure that yole also linked to a larger doc that has a bunch of coding conventions that we've mostly reached consensus on so far

but I don't know what the link is anymore; it's fallen off Slack due to our 10k message limit

That's is not really Kotlin specific

General space on the Kotlin slack.

ok

Trying to use kotlin-reflect in an Android app and proguard bombs out on it: Warning: kotlin.reflect.jvm.internal.KClassImpl: can’t find referenced class kotlin.reflect.jvm.internal.KClassImpl$kotlin.reflect.jvm.internal.KClassImpl$Data … (about 7-8 more similar ones) The Proguard setup already has: -keep class kotlin.** { *; } -keep class org.jetbrains.** { *; } … -keepattributes Exceptions,Signature,InnerClasses,SourceFile,LineNumberTable,EnclosingMethod I’m clearly missing something, but struggle to see what - anyone having a suggestion by any chance?

can someone explain when I need the jre8 dependencies for kotlin std lib?

When we inherit a class with some other class,do we have to pass the parameters all the time to the super class?

open class Base(p: Int) class Derived(p: Int) : Base(p)

do we have to pass p to the super class Base class

cant I inherit like below

open class Base(p: Int) class Derived(p: Int) : Base()

you shouldn’t be able to do that @mohita

doesn’t make sense right? where’s Base gonna get it’s

p

from

What do I need to do to use 1.2-M1 ? I'm seeing 1.1.2 popping back into my files at random, Im super confused