Stephan Schroeder
02/14/2020, 5:03 PMFun String.removeChars(allTheCharsToRemove: String): String
there is the String.replace(regex, replacement) that you could call with ""
as second parameter. So I’d have to create a Regex from my allTheCharsToRemove
(how? if that’d be your approach) or is there a better way?Luke
02/14/2020, 6:41 PMinline fun <T> List<T>.applyOnEach(block: T.() -> Unit): List<T> = onEach { it?.block() }
Is there a way to mark the receiver in T.() -> Unit
as not nullable?Buzz
02/14/2020, 10:15 PMBrian Dilley
02/14/2020, 11:54 PMBruno_
02/15/2020, 3:07 PMbod
02/15/2020, 5:37 PMDuration
abstraction but what about a Moment (aka, Date or Time stamp, or a point in time)? Is that what ClockMark
represents?ec
02/15/2020, 8:32 PMtypealias SessionId = String
typealias TopicName = String
fun unsubscribe(who: SessionId, from: TopicName) {..}
fun subscribe(to: TopicName, handler: (Topic) -> Unit)
Jeff
02/16/2020, 9:48 AMChills
02/16/2020, 1:58 PMco-routine scopes
for coroutines
can someone explain me in layman
terms.
builders are used to create coroutines
dispatchers to alter context.camkadev
02/16/2020, 3:11 PMCannot infer type parameter
what should i do at Serializer
line 31
?
https://github.com/AlexanderShniperson/KotlinNativeSerializationkrtko
02/16/2020, 9:08 PMany::class.simpleName
, does that still require including the Kotlin Reflection jar?ersin_ertan
02/17/2020, 12:42 AMpackage kotlin.reflect.jvm.internal.calls.Caller.checkArguments(args: Array<*>)
respect functions with default parameter values? I don't want to include it in func.call(..., "alreadyHasADefaultValue")
, and am stopped by throw IllegalArgumentException("Callable expects $arity arguments, but ${args.size} were provided.")
Gyuhyeon
02/17/2020, 9:17 AM.filter{req: ClientRequest, next: ExchangeFunction ->
// do something
}
works.
However, what I'd like to do is pass a function reference instead of the lambda so that I don't have to actually put 50 lines of code inside the .filter
call.
I'm quite new to Kotlin and I have a very fragile understanding of higher order functions, so I have no idea how to achieve this.
I thought making the method like this -
private fun customFilter(request: ClientRequest, next: ExchangeFunction){
}
and calling like .filter(::customFilter)
would work, but it didn't - IDE tells me
Type mismatch.
Required:
ExchangeFilterFunction
Found:
KFunction2<@ParameterName ClientRequest, @ParameterName ExchangeFunction, Unit>
It seems like I have to somehow implement the ExchangeFilterFunction.java which is a java @FunctionalInterface
...? Any advice is appreciatedJakub
02/17/2020, 10:15 AMdays.groupBy { it.date.year }.forEach { (year, daysOfYear) ->
daysOfYear.groupBy { it.date.month }.forEach { (month, daysOfMonth) ->
aysOfMonth.groupBy { it.date.weekNumber() }.forEach { (week, daysOfWeek) ->
}}}
2.
days.groupBy { Triple(it.date.year, it.date.month, it.date.weekNumber()) }.forEach { (triple, days) ->
}
hooliooo
02/17/2020, 12:48 PMChills
02/17/2020, 6:35 PMsuresh
02/18/2020, 5:20 AMOfir Bar
02/18/2020, 8:50 AMtjohnn
02/18/2020, 11:35 AM() -> Unit
eekboom
02/18/2020, 11:53 AMfun sort(list: List<String>): List<String> {
val collator = Collator.getInstance(Locale.GERMAN)
collator.strength = Collator.PRIMARY
return list.sortedWith(Comparator {a, b -> collator.compare(a, b)})
}
Gunslingor
02/18/2020, 2:40 PMJan Stoltman
02/18/2020, 3:20 PMEXPERIMENTAL_API_USAGE
warnings in my project build logmaxmello
02/18/2020, 4:25 PMabstract class A<T : A<T>>(
val id: Id<T>
)
class B(id: Id<B>) : A<B>(id)
class C(id: Id<C>) : A<C>(id)
I want to have polymorphism in a DB model, and the library provides type safe Id
with generics. I want the superclass to have the id property and to restrict it to be of any subclass of itself. For this I have the A<T : A<T>>
definition on top. Now, a subclass passes in its own type and only allows id to be of that type, making sure I never have Id<C>
in a B
class.
But when trying to use that type system, I have the problem of recursive definition of the parameter of A. For example when mapping a list of instances of objects holding subclasses of A, I need to specify the type variable like this:
SomeClassHoldingASubclasses(…)
=> SomeClassHoldingASubclasses<A<A<A ... > > >
It is not possible to do it like this: SomeClassHoldingASubclasses<*>
“projections are not allowed on type arguments of functions and properties”
If I remove the type variable from A, I cannot pass an id : Id<B> to the constructor of A.
I’m trying to get this to work for quite some time now, but are these polymorphic / self-referencing type variables even possible? Should I use in
or out
(I tried but that also went weird fast)?Ian
02/18/2020, 4:36 PMjava.lang.IllegalStateException: Backend Internal error: Exception during code generation
exception while trying to compile my code after updating some Gradle dependencies to their most recent version: https://gist.github.com/sanity/d4d0a84155a52a26c09386b0cf9a9e27
Anyone have any ideas what it might be? Unfortunately it's blocking progress on my project.Nikita Khlebushkin
02/18/2020, 5:15 PMopen fun track(event: String, properties: Map<Any?, *>?, options: Map<Any?, *>?): Unit
How can I create a map that would have satisfy properties
type?Jason
02/19/2020, 6:07 AMTransformations.map
and Livedata.map
?
Which one is better ? And what is usecase for it?camkadev
02/19/2020, 8:38 AMCarlosP
02/19/2020, 10:48 AMinterface ExperimentManagerDelegateCore {
interface ExperimentManagerDelegate:ExperimentManagerDelegateCore {
I have the classes:
abstract class ExperimentManagerCore {
open var delegate: WeakReference<out ExperimentManagerDelegateCore>? = null
}
class ExperimentManager():ExperimentManagerCore() {
override var delegate: WeakReference<ExperimentManagerDelegate>? = null
}
but in ExperimentManager
I got the error:
Type of 'delegate' doesn't match the type of the overridden var-property 'public open var delegate: WeakReference? defined in ExperimentManager.ExperimentManagerCore'
I thought I would fix it with out ExperimentManagerDelegateCore
Any ideas?Jan
02/19/2020, 12:20 PM0x1p10
in kotlin?Leon K
02/19/2020, 12:48 PMsuspend
, make the function suspend
, otherwise don't". I know the same thing can be achieved using inline fun
, but I have to access private fields in this function so that's not an option