kotlinlang #getting-started

it'd be fine to instead just had a property that always shared the exact value of that other one, and changing it, changed the other one. in c++ i'd do that with pointers

Hullaballoonatic

06/22/2018, 8:48 PM

maybe delegation?

wineluis

06/24/2018, 11:16 AM

Optional<? extends Enum<?>> enumProperty = block.getState().getTraitValue(EnumTraits.LOG_VARIANT);

karelpeeters

06/24/2018, 11:17 AM

https://kotlinlang.org/docs/reference/generics.html#variance

karelpeeters

06/24/2018, 11:17 AM

I think you need

in

wineluis

06/24/2018, 11:20 AM

hmm i dont understand

wineluis

06/24/2018, 11:20 AM

EnumTraits.LOG_VARIANT is EnumTrait<*> and getTraitValue complains it can not infer a type

wineluis

06/24/2018, 11:21 AM

I cant use

in

there

Daniele Segato

06/27/2018, 8:19 AM

I already asked the question in #general yesterday, but I simplified it now and I think this is more suited channel...

Raw

is actually an RxJava

Single

type,

x().y().z()

are a chain of Rx operators converting the

Single

into an

Observable

and doing other stuff.

xyz()

is actually an empty

Observable

. But this is more of a language question, it has nothing to do with Rx

Chaining_null-conditional_on_a__when_.kt

Andreas Sinz

06/27/2018, 8:21 AM

@Daniele Segato https://kotlinlang.slack.com/archives/C0922A726/p1530023593000937?thread_ts=1530015798.000548&cid=C0922A726

😅 1

user

06/27/2018, 8:22 AM

A file was commented on

Daniele Segato

06/27/2018, 8:24 AM

@Andreas Sinz wow why didn't I think about that? --- What if the condition is different the

null

or I have more then 2?

Andreas Sinz

06/27/2018, 8:29 AM

@Daniele Segato you could use

takeIf

(https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/take-if.html) like

when() {}.takeIf { it == "foo"} ?: /* else */

Daniele Segato

06/27/2018, 8:30 AM

@Andreas Sinz thank you very much!!

Gta

06/27/2018, 9:23 AM

Hi guys

Gta

06/27/2018, 9:23 AM

Copy code

class A(b: ClassB)  {
private val c = b.doSomething()
private val d = c.doSomething()
}

Gta

06/27/2018, 9:24 AM

does kotlin guarentee a corrected order of initialization for each property ? i.e hope it will not initialize d before c

Gta

06/27/2018, 9:25 AM

and as for code “smells”/quality/readability or good practice is it better to do that in a constructor ?

karelpeeters

06/27/2018, 9:29 AM

Yes, the initialization order is guaranteed.

karelpeeters

06/27/2018, 9:36 AM

https://kotlinlang.org/docs/reference/classes.html#constructors

karelpeeters

06/27/2018, 9:36 AM

Look at the properties in the runnable code sample there.

Daniele Segato

06/27/2018, 12:37 PM

This can be done in java without duplicating the variable.

Exposing_superclass_interface_in_getter.kt

diesieben07

06/27/2018, 12:40 PM

This can be done in java without duplicating the variable.

I would be interested to find out how you do that.

marstran

06/27/2018, 12:58 PM

I think he means he can define the field with

private final Implementation myData = new Implementation()

and the getter with

public InterfaceOrSuperclass getMyData() { return myData; }

diesieben07

06/27/2018, 1:07 PM

And that is no different than two properties in Kotlin...

Richard Green

06/28/2018, 12:57 PM

Can someone explain to me this (I posted on stack overflow but … figured this channel might be a better place)

menegatti

06/28/2018, 1:02 PM

it should be

M.C(3)