nsk-mironov

import com.facebook.litho.Column
import com.facebook.litho.Component
import com.facebook.litho.ComponentContext
import com.facebook.litho.Row
import com.facebook.litho.fresco.FrescoImage
import com.facebook.litho.sections.widget.RecyclerCollectionComponent
import com.facebook.litho.widget.Card
import com.facebook.litho.widget.CardClip
import com.facebook.litho.widget.EditText
import com.facebook.litho.widget.EmptyComponent

nsk-mironov

Delegated properties is a really nice feature of Kotlin and we are using them a lot in our code base. The entire project contains more than 500 delegated properties. Unfortunatelly, each property compiles to a class with 6 extra methods. While this can be fine if you're running on JVM, this is absolutely unacceptable in case you're targeting Android.

For example, the following class produces 2 more classes, Delegate$bar$1 and Delegate$foo$1:

public class Delegate(private val values: Map<String, Any>) {
  public val bar: String by values
  public val foo: String by values
}

nsk-mironov

import io.reactivex.Observable
import io.reactivex.ObservableSource
import io.reactivex.Observer
import io.reactivex.internal.fuseable.HasUpstreamObservableSource
import io.reactivex.internal.fuseable.QueueFuseable
import io.reactivex.internal.observers.BasicFuseableObserver

abstract class BaseObservableMap<T : Any, U : Any> protected constructor(private val source: ObservableSource<T>) : Observable<U>(), HasUpstreamObservableSource<T> {
  override fun source(): ObservableSource<T> {
    return source

nsk-mironov

package com.github.vmironov

import kotlin.reflect.jvm.internal.impl.serialization.ClassData
import kotlin.reflect.jvm.internal.impl.serialization.Flags
import kotlin.reflect.jvm.internal.impl.serialization.ProtoBuf
import kotlin.reflect.jvm.internal.impl.serialization.jvm.JvmProtoBufUtil

data class Foo(val foo: String)
data class Bar(val bar: String)

nsk-mironov

class AccountViewModel : ObservableModel by ObservableModelDelegate() {
  @get:Bindable var name by property<CharSequence>("", BR.name)
  @get:Bindable var authenticated by property(false, BR.authenticated)
  @get:Bindable var avatar by property("", BR.avatar)
}

nsk-mironov

final class com/github/vmironov/MainKt$main$first$1 extends kotlin/jvm/internal/FunctionReference  implements kotlin/jvm/functions/Function2  {
  // access flags 0x1041
  public synthetic bridge invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    ALOAD 0
    ALOAD 1
    CHECKCAST com/github/vmironov/A
    ALOAD 2
    CHECKCAST java/lang/Number
    INVOKEVIRTUAL java/lang/Number.intValue ()I
    INVOKEVIRTUAL com/github/vmironov/MainKt$main$first$1.invoke (Lcom/github/vmironov/A;I)I

nsk-mironov

<T:Ljava/lang/Object;A:[TT;>(TA;I)TA;

nsk-mironov

public class StackOverflow {
  public static void main(String[] args) {
    final Observable<Integer> firstObs = Observable.just(1, 2, 3, 4, 5);
    final Observable<Integer> secondObs = Observable.just(2, 4, 6);

    final Observable<Integer> result = secondObs.toList().flatMap(new Func1<List<Integer>, Observable<Integer>>() {
      @Override
      public Observable<Integer> call(final List<Integer> ignore) {
        return firstObs.filter(new Func1<Integer, Boolean>() {
          @Override

nsk-mironov

public final class OperatorThrottleList<T> implements Operator<T, List<T>> {
  private final Scheduler scheduler;
  private final long interval;

  public OperatorThrottleList(final long interval, final TimeUnit unit, final Scheduler scheduler) {
      this.interval = unit.toMillis(interval);
      this.scheduler = scheduler;
  }

  @Override

nsk-mironov

public class Main {
    public static void main(final String[] args) throws Exception {
        Observable.from(Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12))
                .groupBy(item -> item % 4)
                .flatMap(Observable::toList)
                .filter(integers -> integers.size() > 2)
                .toList()
                .subscribe(result -> {
                    System.out.printf("%d results %s%n", result.size(), result);
                });